# Old users migrate, Apple sets the stage: a Japanese calendar app renamed "手帐" and relaunched, 185 ratings in two months · Mobile app

> Source: https://stringers.io/en/apps/ios_6802022248.html (Stringers / 什么值得做, generated 2026-11-08)
> Stringers answers one question every day: what small product can one or two people build in a few months and actually make money from. Numbers come from 15 databases we collect daily, each with source and date.
> For agents: these verdicts and the underlying databases (verified revenue, App Store / Google Play charts, ad libraries, GitHub, Product Hunt…) are queryable live over MCP — tools today / hot / products / directions / direction / data. Setup: https://github.com/komako-workshop/stringers (the user logs in at stringers.io → "配置 agent" to get a personal URL). Site index: https://stringers.io/llms.txt

> The same company's calendar app has 28k ratings, and a large group of old users moved over directly. Apple also gave it editor's picks twice, on iOS 27 and iPhone Duo, right as Japan's planner-switching season hit.

[Mobile App](https://stringers.io/en/apps/index.md) · iOS · written 11-6

FirstSeed手帳 - カレンダー＋メモ帳 · FirstSeed Inc

# Old users migrate, Apple sets the stage: a Japanese calendar app renamed "手帐" and relaunched, 185 ratings in two months

**What it is** A "one page per day" planner for iPhone/iPad: the top half shows the events and reminders from the phone's built-in calendar, the bottom half is for notes, photos and handwriting, with no data import needed.

**Why it took off** The same company's calendar app has 28k ratings, and a large batch of its long-time users moved over. On top of that, Apple gave it editorial features twice, with iOS 27 and iPhone Duo, right during Japan's seasonal planner-switching period.

**C** **How you could follow** Don't copy it; go after what it does poorly: a Mac version, integration with Google Calendar/To-Do, a one-page-per-day planner for office workers. Acquisition relies on shipping compatibility the day Apple releases a new system or device, to earn editorial features.

C grade: its volume comes from its own existing user base and Apple's editorial slots, which followers can't get. The form itself is easy to copy, but during the same period small copycats only reached 0–6 ratings, and the Japanese planner market also has big players like Lifebear and ほぼ日. The lessons worth taking are the "bundle products then launch" and "ride Apple's launch day" tactics; copying it directly isn't worth it. Whispers in small circles

Data (updated daily) · first listed 2026-09-03 · Japan rating 201 · charted in 11-08 of 1 stores

iOS · best category chart rank · by store

Data 2026-10-28 → 2026-11-08 (12 days, 12 observations). Lower rank is higher; gaps mean it wasn't charted that day

iOS · rating count · Japan

Data 2026-10-28 → 2026-11-08 (12 days, 12 observations). Apple doesn't publish download counts; rating growth is a proxy for downloads.

FirstSeed, a Tokyo small company that had made iOS calendar apps for 7 years, combined its calendar and notes in September into a "one page per day" planner app and relaunched it. It got 185 ratings in two months, only in Japan, peaking at #61 in the Productivity free chart. The volume isn't large, but the path to traction is clear: first bring old users over, then show up with compatibility on the day Apple releases each new system or hardware. Indie developers can learn half of this; the other half they can't.

### A calendar user who says "I rarely write down schedules"

In 2026 Sep 16, a Japanese user left a four-star review of "FirstSeed手帳" on the App Store. She said she had long used this company's calendar app and liked it, but as a full-time homemaker, "I rarely have schedules to enter, and I'd rather have somewhere to jot down small things and memos." So when the planner version came out, she "didn't use both together, she moved straight over to the planner."

She is not an isolated case. In the nearly 30 Japan-store reviews since this app launched in Sep 3, at least 10 open with the same idea: "I've been using this company's calendar", "Finally a planner version!", "moved over from the calendar", "I loved the calendar, so I installed the planner to try it." Others who used a different calendar, "さいすけ", plus the diary app "My日記", now say "this one is enough."

In other words, a large share of this app's first two months of users were already this company's people.

### What it is

In one line: open it to today's page; the top half is the calendar and today's events and reminders, the bottom half is a blank note you can type in, add photos to, or handwrite on an iPad. The dividing line can be dragged: on busy days the calendar takes up more space, and on days you want to write, the notes take more. Unfinished to-dos from today can be moved to tomorrow's page with one tap.

The key is "not building your own calendar." It reads and writes the iPhone's built-in Calendar and Reminders directly, so events from iCloud, Google, and Exchange show up as soon as you install it, with no import and no need to give up the calendar app you already use. The store page says it plainly: "No need to migrate data, no need to disable your current app." Content is visible the moment you open it; it's not an empty notebook.

Monetization is freemium with Pro: ¥450 per month, ¥3,500 per year, or a one-time purchase at ¥9,800 (App Store page). Pro sells multi-device sync, automatic iCloud backup, weather and rokuyo, and drag-to-reschedule. Several reviews say "I chose the one-time purchase", while others grumble that "even a one-time purchase is too expensive". Japanese productivity-app users dislike subscriptions, and some will pay a high one-time price.

### Why now

Four things lined up between 9 and November.

**A ready pool of existing users.** FirstSeed's flagship "FirstSeedカレンダー" launched 2018 years ago, with 27.8k ratings in the Japan store, and as of November it was still around #100 in the Productivity top grossing chart. The note-taking app the same company released in March this year gathered only 77 ratings in 8 months; the planner has more than twice that in 2 months, with 35 new ratings in the last 7 days, close to 70% of the flagship calendar's (49 ratings). The difference is that for calendar users the planner is an "upgraded version", while the note app is not.

**Apple gave it editorial slots twice.** Within a week of launch it was featured in the App Store's "best apps for iOS 27" feature (press release reposted by ASCII 9-15); in October it made the "recommended apps for iPhone Duo" feature (PR TIMES 10-23). This company's calendar and notes apps had both been featured on App Store story pages before, so it already had a relationship with Apple's editors.

**Shipping on the first day of every new system and new hardware.** iOS 27's Siri can read content inside apps, and it adapted; iPhone in landscape shows two side-by-side pages; the foldable iPhone Duo opens to a spread like a planner. Each compatibility update came with a PR TIMES press release, reposted by ASCII, ITmedia, AppBank and several major newspaper websites. After the 10-23 Duo feature and the 10-27 Japanese-language iOS 27.2 launch, daily new ratings rose from 2–4 to 5–8. The timing lines up, though whether it's causation is hard to say.

**Japan's planner-switching season.** From 9 to December every year, Japanese bookstores fill up with next year's paper planners. An app pitched as "move your paper planner to your phone" launched in September, and the timing was spot on (inference, no direct data).

### Where users came from, and where they didn't

| Channel | Evidence | Verdict |
|---|---|---|
| Existing users of the company's calendar app | At least 10 of the nearly 30 reviews say they moved over from the calendar; the official site lays out four apps side by side as a "what do you want to organise" entry point | Main source, confirmed |
| Apple editorial features | iOS 27 feature (September), iPhone Duo feature (October) | Confirmed |
| press releases | Three on PR TIMES, picked up by tech media | Confirmed, but only reposts, no in-depth reviews |
| blogs | A few personal blogs and note articles (late October) | Yes, small volume |
| X, TikTok | No discussion found | almost none |
| Paid acquisition | No traces seen | Unknown. Not finding it doesn't mean there was no paid push |

Whether a pop-up or banner in the Calendar app sends people over to the planner can't be seen from outside. Reviews only show that people really did come from there.

### What users are complaining about

The requests in the reviews are concentrated, and they point right at what it still hasn't done well:

- **Want a Mac version.** "Please support Mac!!" "I want a Mac version, Pro is fine too."

- **Want integration with other tools.** Someone who uses desktop Google Calendar at work asked for Google ToDo to show up, "at this point I don't want to switch to iOS Reminders"; others want to sync with their own note-taking app.

- **The phone screen is too small.** A two-star review said the concept is interesting, but on a phone it shows at most 5 events a day, "a niche app for people with few events and lots of notes." iPad users rate it noticeably better: "On iPad this is the best calendar, I can't go back once I've used it."

- **Details.** Dark mode, notification sounds, note templates, mixing handwriting and typing, undated reminders pinned on screen. 8 versions in two months, some of the requests already added.

### Who it's competing with

Japan's "calendar plus planner" is an old track, and the big players are all there (Japan-store ratings count, 11-06):

| Product | Scale | How it differs |
|---|---|---|
| Lifebear | 327k ratings, Top Grossing 32 | Own calendar account, templates, sticker community |
| TimeTree | 1.07M ratings | Focused on shared family calendars, no daily note page |
| Cahoカレンダー and other "cute calendars" | 37–400k ratings | Ad-monetized, skews student |
| ジョルテ(Jorte) | 5,007 ratings (iOS) | Long-standing "system planner", ads plus subscription |
| Hobonichi Techo App | 1,730 ratings, +43 in 7 days | Digital version of the famous paper planner brand, strong on brand |
| Goodnotes planner templates | 270k ratings | Handwritten PDFs, not linked to the system calendar |
| Apple's built-in Calendar + Notes + Journal | Everyone | Three separate apps, exactly the problem FirstSeed solves |

The more relevant comparisons are small products launched around the same time: "LEFT / RIGHT — 見開き手帳" (10-08 launch), "Daylog 手帳" (10-26), "KanKan 週間手帳" (09-17). They're also digital planners, each with 0 to 6 ratings. The format is easy to copy; the hard part is that nobody walks you in.

### If it were you

**One-line take:** You can learn from it, but don't copy it wholesale. Its volume came from its existing users and Apple's editors, two things you don't have. The "one page a day plus the system calendar" format is open to anyone, and the small accounts that did it at the same time got no volume.

**Who it suits:** iOS developers who already have a calendar, notes, or to-do app with a few thousand to tens of thousands of existing users. The playbook of "merge two products into a new format, rename it, and launch again" can be used directly. Or people who know iPad, handwriting, and foldables well and can ship proper support on the day Apple announces new hardware.

**Who it doesn't suit:** Indie developers starting from zero with no existing users and no Apple feature, who want to go head-to-head with Lifebear and Hobonichi in Japan's planner market. Relying on X or TikTok for volume won't work either, since almost nobody talks about this category on social platforms.

**How to do it:** Don't build a second FirstSeed planner. Go after the part it hasn't done well. The three loudest requests in the reviews: a Mac version, two-way sync with Google Calendar and Google ToDo (for people who use Google at work), and information density on the phone. One angle you could take is "a one-page-a-day planner for people who work in Google Workspace," covering iPhone, iPad, and Mac, with zero migration by using the system calendar, and a first screen that isn't empty. Charge the way it does: a subscription plus a higher-priced one-time purchase.

**How to get users:** It's really about winning Apple's editorial picks and search placement. Have support ready on the day of each major iOS release or new device launch, pair it with a press release (in Japan, via PR TIMES), and apply for Apple's features. Put words Japanese users actually search for, like "手帳" and "カレンダー", in the store title. If you have other apps, leave an entry point in your older apps for existing users.

**When to be ready by:** Japan's planner-switching season runs until late December, so this year is already too late. Aim for the stretch from WWDC in June of 2027 to the new system launch in September. When new system features and new hardware come out, ship support on day one, then ride into the September planner-switching season.

**What would mean you read it wrong:** ① After FirstSeed Planner's Apple-feature bump fades, Japan-store daily new ratings still hold above 5 and it climbs into the top 30 of the Productivity free chart before year-end. That would mean the "one page a day" format pulls on its own, not just because of existing users and recommendations, so a newcomer building from scratch would have a chance too. ② Conversely, if one of the small same-period accounts like LEFT / RIGHT or Daylog grew without an Apple feature, that means there are other acquisition paths you can use. ③ If Apple adds a "daily note page" to its own calendar or journal app, this whole category gets squeezed.

[iOS store page ↗](https://apps.apple.com/app/id6802022248)

**Research notes: competitor table, acquisition evidence, full research report**

Competitors

| Name | Where | Launched | Scale | How it differs from this one |
|---|---|---|---|---|
| Hobonichi Techo App - LIFE's BOOK | iOS | 2025-10 | jp 1,730 ratings, 7 days +43, Productivity Top Grossing 71 | Digital version of the paper planner brand. FirstSeed uses the system calendar directly, zero migration, opens on iPad and foldables |
| Lifebear | iOS | 2012 | jp 327k ratings, Top Grossing 32 | Own calendar + account + template stickers. FirstSeed needs no account and reads/writes iCloud and Google Calendar |
| ジョルテ Jorte | iOS | 2012 | jp 5,007 ratings (iOS), Top Grossing 74 | Long-standing system planner, ads + subscription. FirstSeed is native iOS design, with notes on the daily page |
| TimeTree | iOS | 2015 | jp 1.07M ratings, overall free chart 87 | Focused on shared calendars, no daily note page |
| Cahoカレンダー / シンプルカレンダー | iOS | 2018–2019 | jp 37–400k ratings | Mass-market cute calendar with ad monetization. FirstSeed skews toward working adults and iPad users, subscription/one-time purchase |
| Goodnotes planner templates | iOS | 2019 (current jp version) | jp 270k ratings | Handwritten PDF planner, not linked to the system calendar |
| Apple's built-in Calendar + Notes + Journal | Big-company features | — | full range | Three separate apps. FirstSeed puts them on one page |
| FirstSeedカレンダー (own app) | iOS | 2018-02 | jp 27,828 ratings, 7 days +49, Productivity Top Grossing 103–133 | Plain calendar. The planner version added daily notes, and many users migrated from here |

Where users come from

- **Verified** **Migration from existing users (FirstSeedカレンダー/Tasks/Notes)** : At least 10 of the 28 recent jp reviews say they came from FirstSeedカレンダー ("カレンダーから移行しました", "ついに手帳版が"). The official site splits traffic across four apps side by side.

- **Verified** **Apple editorial picks** : Selected for "Best apps for iOS 27" one week after launch (ASCII 2026-09-15). Selected for "Recommended apps for iPhone Duo" (PR TIMES 2026-10-23). The company's calendar and notes apps also got App Store Stories.

- **Verified** **Day-one support for new system and hardware** : iOS 27 Siri AI integration, landscape support, iPhone Duo foldable support. After 10-23, daily new ratings rose from 2–4 to 5–8 (timing matches, causation not proven).

- **Verified** **PR: PR TIMES three releases (09-07, 09-15, 10-23), picked up by ASCII, ITmedia, AppBank, Asahi, Mainichi, Sankei**

- **Verified** **Blog/YouTube long tail** : gotoharuna.com 10-26 review, note.com personal posts, appli-de-lifehack 10-25

- Inferred **Japan planner refresh season** : launched in September, pitching digital versions of paper planners, lands right before the 9–December planner-switch season; no direct data

- Inferred **Paid acquisition** : ad libraries don't track it, no traces on X/TikTok, nothing found

## FirstSeed Planner (手帳) - Calendar + Notes (iOS, id6802022248) research report

> Date: 2026-11-06. Sources: our appstore database (app_profile / app_day, jp store), Apple lookup and review RSS, developer website, PR TIMES and Japanese tech media. Storefronts checked: in our database this app only charts in the jp store (the all-store scan has only one jp row).

### One line

FirstSeed Inc, a long-running iOS calendar developer in Tokyo 7 years old (its flagship FirstSeed Calendar has about 28k ratings in the Japan store), 2026-09 has released a new planner app, "1-day 1-page" style: system calendar/reminders plus same-day notes, photos and handwriting on one page. It isn't a standalone app that took off from scratch. **The developer merged its calendar and notes products into a "planner" format, and got its first wave of downloads from migrating existing users, Apple editorial features, and launch-day support for new hardware and OS releases.**

### Data

- Launched: 2026-09-03 (Apple release_date; the official press release says the full launch was 9-07). Current version 1.4.1 (2026-11-03); 8 updates in two months (1.0.1→1.4.1).

- Rating count (jp, appstore database app_day): 10-28 143 → 11-06 184,9 days +41; 7 days +35 (rating_velocity_7d). Daily new ratings rose from 2–4 to 5–8. Apple lookup shows 11-06:185 ratings, average 4.38.

- Ranking: best rank in the jp Productivity free chart was #10-29 (61), then it slipped to #96–#128; on 11-03 it reached #126 on the Productivity Top Grossing chart. Never made the overall chart.

- Pricing: free + Pro subscription, ¥450/month or ¥3,500/year, or ¥9,800 one-time purchase (App Store page). Pro covers multi-device sync, automatic iCloud backup, weather and rokuyo, icon badges, and drag-to-reschedule.

- Comparison with the developer's own apps: FirstSeed Calendar for iPhone (launched 2018-02) has 27,828 ratings in the jp store, +7 over 49 days, and charted #103–#133 on Productivity Top Grossing. FirstSeed Notes (launched 2026-03) has only 8 ratings after 77 months. So after 2 months the planner has more than 8 times the Notes app's ratings at 2 months, and its 7-day new ratings are close to 70% of the flagship calendar's.

### Competitors

| Product | Where | Launched | Scale (jp, appstore database 2026-11-06) | How it differs from them |
|---|---|---|---|---|
| Hobonichi Techo App - LIFE's BOOK | iOS | 2025-10 | 1,730 ratings, +7 over 43 days, Productivity Top Grossing #71 | Digital version of a paper planner brand; strong with paper-planner users. FirstSeed reads and writes the system calendar directly, no re-entry needed. |
| Lifebear | iOS | 2012 | 327k ratings, +7 over 668 days, Top Grossing #32 | Own calendar + planner templates + sticker community, with account system. FirstSeed requires no account and uses iCloud/Google/Exchange calendars directly. |
| ジョルテ(Jorte) | iOS/Android | 2012 | 5,007 ratings (iOS), Top Grossing #74 | Long-running "system planner" app, ads + subscription. FirstSeed is native iOS-style and organizes notes page by page. |
| TimeTree | iOS/Android | 2015 | 1.07M ratings, overall free chart #87 | Focuses on shared calendars; no daily notes page. |
| Cahoカレンダー / シンプルカレンダー and other "cute planner" apps | iOS | 2018–2019 | 37–400k ratings | Ad-supported mass calendars, cute and student-leaning. FirstSeed skews toward working adults and iPad users. |
| さいすけ (SaiSuke), カレンダーズ (Readdle), Fantastical | iOS | Long-established | Scale unverified | Pure calendars; reviews mention users switching from さいすけ |
| Goodnotes planner templates / Notion | iOS / cross-platform | Long-established | Goodnotes 270k ratings | Handwritten PDF planners don't link to the system calendar; Notion is too heavy |
| Apple's built-in Calendar + Notes + Journal apps | Big-company features | — | full range | Three separate apps. FirstSeed's pitch is exactly that you don't have to switch between calendar and notes. |
| Same-period small apps: LEFT / RIGHT — Spread Planner (2026-10-08), Daylog planner (10-26), Koyomi Planner (2026-07), KanKan weekly planner (09-17) | iOS | 2026 | 0–6 ratings | Also doing digital planners, but with no existing user base and no Apple feature, so they've gotten almost no traction |

Takeaway: "calendar + planner" is an old category in Japan with no shortage of big players. FirstSeed's position is the small slice of "native iOS, no data migration, iPad/new hardware first."

### Growth tactics (evidence)

1. **Migration from its own users (confirmed, main driver)** : at least 10 of the 28 recent reviews explicitly say they were FirstSeed Calendar users: "I was using the calendar… moved to the planner", "I've been using this calendar… finally the planner version", "moved from the calendar", "I love the calendar, so I tried the planner too." Other users came from FirstSeed Tasks / Notes and asked for all three to be linked (Apple review RSS, jp, 2026-09-09 to 11-03). The official homepage lists all four apps side by side as "what do you want to organize?" entry points (firstseed.io/jp).

2. **Apple editorial features (confirmed)** : within a week of launch it was included in the App Store feature "iOS 27 最適なアプリ" (press release picked up by ASCII 2026-09-15); in October it was featured in "iPhone Duo におすすめのアプリ" (PR TIMES 2026-10-23). The developer has a history of Apple features: FirstSeed Calendar has an App Store Story (id1485683855), and FirstSeed Notes also has a Story (id1890963927).

3. **Launch-day support for new OS and hardware (confirmed)** : iOS 27's Siri AI understands app content (Japanese iOS 27.2 launched on 10-27, ASCII), landscape iPhone two-page view, and the iPhone Duo foldable: "open it and you get a two-page planner." Each adaptation came with a press release and an Apple feature. Daily new ratings rose from 2–4 to 5–8 after the 10-23 Duo feature and the 10-27 iOS 27.2 release, a timing match (correlation, causation not proven).

4. **PR releases (confirmed)** : PR TIMES published three releases, for the 9-07 launch, 9-15 iOS 27, and the 10-23 Duo. ASCII, ITmedia Mobile, AppBank, Asahi &, Mainichi, and Sankei picked them up.

5. **Blog / YouTube long tail (confirmed, small)** : gotoharuna.com (10-26), personal note.com posts, appli-de-lifehack (10-25, which covers planners while discussing calendars), and several YouTubers introduced FirstSeed Calendar early on.

6. **Seasonality (inferred)** : late 9–December is when Japan's planner-switching season happens (bookstore planner shelves). The product launched in September pitching "moving paper planners to your phone", so the timing fits; no direct data proves it.

7. **Not found** : 90 entries in the X corpus (x-radar, 0 days); 0 TikTok results for "FirstSeed"; no evidence of paid acquisition (ad libraries don't track it, which doesn't mean none was run).

### Why it made the charts

- There's a ready-made user base: the same developer's calendar app has 28k ratings and still sits around #100 on the Productivity Top Grossing chart. The new app is essentially an upgraded form for those users, and migrating users make up most of the reviews.

- Apple gave it two editorial slots: one within a week of launch in the iOS 27 feature, then about a month and a half later in the iPhone Duo feature. The developer has long benefited from Apple's new-feature launch boost.

- The product addresses a real pain point: calendars and memos live in two apps. It reads and writes the system calendar and reminders directly, requires zero migration, and has almost no onboarding cost.

- Timing: iOS 27 release, iPhone Duo foldable launch, and Japan's planner-refresh season all hit between 9 and November.

- But it hasn't broken out much: 185 ratings, Japan only, #60–#130 on the free Productivity chart. It's a small, steady start, not a hit.

### Differentiation

- Versus calendar apps (TimeTree, Lifebear, Cahoカレンダー): the core unit is one page per day. The top half holds the calendar and that day's events; the bottom half is free-form notes, photos and handwriting, with a draggable divider. Unfinished to-dos move to tomorrow with one tap.

- Versus planner and notes apps (ほぼ日, Goodnotes, Notion): it doesn't build its own calendar. It reads and writes the system iCloud/Google/Exchange calendars and reminders directly, with zero data migration. It can reformat to A4/A5/B5 and export print-ready PDFs.

- Hardware fit: iPad with calendar on the left and notes on the right; iPhone Duo opens to two pages. On new hardware, it feels like a paper planner.

- Is the differentiation why it took off? **Partly.** Zero migration plus one page per day makes it easy for existing calendar users to "just install one more." But what actually brought people in was its own user base and Apple's recommendations. The product shape itself is easy to copy (LEFT/RIGHT, Daylog and similar small apps are doing it too, but without traction).

### Visibility and copycats

- Visibility: it's talked about in small circles. Japanese tech media only ran the press releases, with no in-depth reviews. X and TikTok barely discuss it. Revenue isn't public (no TrustMRR or founder revenue posts).

- Copycats: none clearly copying it. Similar-concept apps like LEFT / RIGHT — 見開き手帳 and Daylog 手帳 each have 0–2 ratings.

### What others can borrow

1. **Product-line spin-off** : merging capabilities from two existing apps (calendar, notes) into a new format and new name, drawing on its own users and adding another store search entry ("手帳" has high search volume in Japan).

2. **Chasing Apple editorial slots** : adapting on day one of each major iOS release and new hardware (foldables), backed by press releases, to win Apple's "best for iOS X / new devices" features.

3. **Zero migration** : reads and writes the system EventKit calendar and reminders directly, doesn't compete with users' existing calendar data, and the app is full of content from first open.

4. **Subscription + high-priced one-time purchase side by side** : a ¥9,800 one-time purchase was chosen by several reviewers, which suits Japanese productivity users who dislike subscriptions.

5. **Riding the season** : launch planner products in 9–December, when Japan's planner-refresh season hits.

### Still unclear

- No rank and rating curve between 9-03 and 10-27 (our database only starts at 10-28), so we can't say how much traffic the Apple feature brought in that week.

- Whether there was in-app cross-promotion from the calendar app (banners, pop-ups). Reviews prove migration, but not how it was prompted.

- Pro conversion rate and revenue. Charting once on Productivity Top Grossing #11-03 126 shows people are paying, but the scale is unknown.

- Whether there's paid acquisition (Apple Search Ads, etc.): can't be found.

- Is it available outside Japan? The app supports 21 languages, and regions like Taiwan get a localized name (FirstSeed Planner), but the database only has jp charting.

### Sources

- Apple lookup: [itunes.apple.com/lookup?id=6802022248&country=jp](https://itunes.apple.com/lookup?id=6802022248&country=jp); all works by the developer: artistId=1321260277

- App Store page (price, version history): [apps.apple.com/jp/app/id6802022248](https://apps.apple.com/jp/app/id6802022248)

- Reviews RSS: [itunes.apple.com/jp/rss/customerreviews/id=6802022248/sortBy…](https://itunes.apple.com/jp/rss/customerreviews/id=6802022248/sortBy=mostRecent/json)

- PR TIMES press release 2026-09-07: [prtimes.jp/main/html/rd/p/000000012.000048210.html](https://prtimes.jp/main/html/rd/p/000000012.000048210.html)

- ASCII iOS 27 feature 2026-09-15: [ascii.jp/elem/000/004/434/4434955/](https://ascii.jp/elem/000/004/434/4434955/)

- PR TIMES iPhone Duo feature 2026-10-23: [prtimes.jp/main/html/rd/p/000000014.000048210.html](https://prtimes.jp/main/html/rd/p/000000014.000048210.html)

- ITmedia Mobile:[www.itmedia.co.jp/mobile/articles/2609/07/news087.html](https://www.itmedia.co.jp/mobile/articles/2609/07/news087.html) ;AppBank:[www.appbank.net/2026/09/08/iphone-news/3097304.php](https://www.appbank.net/2026/09/08/iphone-news/3097304.php)

- Official site: [firstseed.io/jp/](https://firstseed.io/jp/); blog review: [gotoharuna.com/ipad/app_firstseed_planner/](https://gotoharuna.com/ipad/app_firstseed_planner/)

- App Store Story(FirstSeedカレンダー):[apps.apple.com/jp/story/id1485683855](https://apps.apple.com/jp/story/id1485683855)

- App Store database: app_profile / app_day (jp, 2026-10-28 to 11-06)

This article was written by AI from public data and the data we collect daily. Numbers are sourced, and inferences are labeled.