A pharmacology professor's "where I went this year" video made with Codex went viral for a week, then got forked to charge money

Why Timeline Visualizer Original (dev.mahlernim.timelinevisualizer) took off

In short: a Korean pharmacology associate professor at a medical school (Sangzin Ahn, X handle "말러팔삼" @mahler83) built an open-source tool with Codex that renders the Timeline.json exported from Google Maps into an animated route video of "everywhere I went this year." 2026-08-17 He posted on X with an APK link, and over the next week Instagram Reels, Threads, TikTok and Naver blogs in Korea, Taiwan, Indonesia and Vietnam picked up the "make a whereabouts video from Google Timeline" trend. The APK on GitHub was downloaded about 390k times. The Google Play version went live in Sep 6, catching the tail of the buzz. It now has 29k installs cumulatively, with about 300 more per day.

1. How to read the data card

Key point: the main battleground was not Play. During the peak days of August 17~25, the only Android install path was the APK in the GitHub releases (Korean media at the time wrote that "it's still under review on the Play Store"). The 29k Play installs are the long tail after the peak, plus GitHub users who migrated over later. Its rank on the Korean, Taiwanese and Japanese video player category charts is a bit of organic search traffic from the long tail, not the driver of the surge.

2. How it took off (timeline)

• 2025-12: The author first built a web prototype of a "this year's movement route video" with Antigravity, posted it on X, tagged #바이브코딩 (vibe coding).
• 2026-08-17: He used Codex to turn the prototype into an Android app and posted on X: "Google Timeline turned into a video of your activity for 1 years... Android users, download the apk and try it", with a GitHub releases link and his own sample video. Below it he added a route video of his 2024 family trip to the US to see the total solar eclipse (x.com/mahler83/status/2089260854940479929). He shipped v1.1~v1.7 the same day.
• 08-18~08-20: It spread on X. The author wrote in English "thank you for the overwhelming attention" and, at the same time, tested a prototype that lets you set location such as your home address to "private" (x.com/mahler83/status/2090261613467304447; the release includes privacy-prototype-1/2.1). Taiwan Threads user @enppopi_0720 posted the APK link, and that post got 292k views (threads.com/@enppopi_0720/post/DcRFsrxnWNR). Right after, he built a Safari web version for iPhone (ahn-lab.org/google-timeline-visualizer/).
• 08-19~08-23: The most intense iteration happened over a few days, with several versions a day (v2.0~v2.3.5, plus experimental builds like camera-lab and trips-lab). APK downloads also peaked in these days, about 1~30k per version.
• Concurrently, Korea: Lifestyle media like dediteu (the_edit.co.kr) posted on Instagram "a developer's work on X has recently become a topic," linking straight to the GitHub and web versions and crediting X (말러팔삼) in the image (instagram.com/p/DcQn7WeIDt8). Naver blogs then published a batch of tutorials (twin_n, 9reeyoun, yebongcha, sk3374, wodmsdl0527 and others, all titled "How to make a Google Timeline video"), and Instagram Reels filled up with "making videos with the Google Timeline trend these days."
• Concurrently, Indonesia and Vietnam TikTok (TikHub search): @woyriddd 08-22 4.95M views, @lah_mana_saya_tau_ 08-23 5.1M, @hafiyya.18 08-25 4.93M, @bggadget22 08-23 3.23M ("tutorial without installing the app"), @rhnnpl2_ 08-22 2.49M (the caption directly linked github.com/mahlernim), and Vietnam's @fish_onthecloud._ 08-23 2.95M. Hashtags: #timelinevisualizer #linimasa (Indonesian for "timeline") #googlemaps. The content was self-deprecating "I've been all over the place / look how busy I am" plus tutorials, with people asking for the link in the comments.
• From 08-27: v3.0 added "Travel Journal," which keeps the data from each import on the device and fills in details across exports. GitHub star growth basically stopped (our observations: 08-27 2,879 stars, 11-06 3,064 stars; trendshift recorded 9/7~11/6 with only 97 stars gained).
• 09-06: The Play version launched; 09-06~09-09 it was renamed Timeline Visualizer Original, with Indonesian and Vietnamese store copy added, plus an "original" social sharing image (commits "Add Indonesian, Vietnamese and original-app social sharing" and "Optimize localized Play listing copy for original app"). The rename was to distinguish it from same-named reskinned versions that had already appeared.
• 10-05: v3.1.0, after which it entered a maintenance phase.

3. Why users come now and why they're willing to use it

1. Google removed Timeline from the web. In 2024~2025 Google moved Timeline to be stored only on the phone, the web version stopped working, and data is auto-deleted after the default 3 months (the Indonesian TikTok caption from @hafiyya.18 complains "if it weren't auto-deleted every 3 months, I'd have gone everywhere by now"). Many people discovered for the first time that their phone holds an exportable Timeline.json but no fun way to look at it. This app gives that idle data a use.
2. A naturally shareable output. The result is a vertical MP4 where a small dot on a map runs along your route for the year. Post it and it's a Reel/TikTok; viewers ask "how did you make that," which creates a loop of "tutorial in the comments." It's the same mechanism as Spotify Wrapped: a retrospective built from private data that's worth showing off.
3. August is peak summer travel season. Most Korean blogs were "my family's domestic trip log from August" (twin_n).
4. Zero barrier, reasonable on privacy. No login, no upload, files are processed on the device, and there's a web version for iPhone users. Korean bloggers specifically praised "no sign-up, no app to install."
5. The author moved extremely fast. When users raised "your home location would be exposed," a private-location prototype appeared within three days; when iPhone came up, a web version followed; 9 languages (including Indonesian and Vietnamese). One person using Codex shipping several versions a day.

Money: none. No in-app purchases, no ads, and the store page states that no Google sign-in is required and there is no analytics. The author is a university professor, and the project is about showing on X what vibe coding can produce, not about income.

4. Competitors

Bottom line: "real location history → one-click shareable route video" had not been done to a usable standard before it. The big players either only read tracks recorded in their own apps (Relive, Polarsteps) or require drawing routes by hand (TravelBoast, TravelAnimator, which prove that "route animation video" alone is a category with tens of millions of installs that can charge subscriptions). The open-source crowd built viewers, not video exporters.

5. Copycats and reskins (already appearing)

• timelinevisualizer.net: forked this MIT project directly and turned it into a web tool. Monetization is a one-time Pro purchase: background music (the original exports silent video), stats cards, @handle watermark, 5 map styles, route generation from photo EXIF, and so on. They also offer a 7-day refund. The page openly says "started from the open-source google-timeline-visualizer project." This is the only clear case of a copycat monetizing so far.
• timelinevisualizer.world: a web tool with the same name, with Terms/Privacy pages, competing with the original for the "Timeline Visualizer" search term.
• Same-name clones on Play: com.istimewadev.timelinesvisualizer (Istimewa Dev, Indonesia, "Timeline Visualizer", 1K+, with ads, store copy stuffed with keywords like "Timelines Visualizer, travel timeline visualizer"); com.journeyreplay.traveltimeline (PT Pengembang Sebelah, Indonesia, "Timeline Visualizer Video App", 100+, with ads). Both updated around Sep 1, riding the Indonesian TikTok search wave.
• The original's response: September renamed it to add "Original" and wrote "the original open-source app" in the store copy.

6. Growth tactics broken down

7. Why it charted

• Timing: after Google moved timelines to local storage and removed the web version, users were left holding a Timeline.json they could export but had nowhere to view. August's summer travel, plus the "year in review" sharing habit, lined up with that.
• Product: the output is itself a short video, so it spreads naturally on Reels/TikTok; no login and no upload lowers the psychological barrier to "handing over location data."
• Distribution: the author has a following on X in Korean AI/dev circles, which lit the first spark; Korean media and blogs picked it up, then it spread to Taiwan's Threads and to TikTok in Indonesia and Vietnam. Zero paid promotion throughout; growth came from the loop of "see someone's video → ask for the link → tutorial."
• Execution speed: Codex let one person ship several versions a day; within three days privacy masking and an iPhone web version were added, so users didn't churn during the peak days.

8. Differentiation

Compared with Relive and Polarsteps: it reads the multi-year Google location history you already have, with no need to install in advance and leave recording on. Compared with TravelBoast and TravelAnimator: the routes are real, not hand-drawn, and it's free. Compared with open-source viewers: it outputs a video you can post directly, not a map for yourself. The differentiator is the jump from "existing private data → shareable video," and that's really why it took off. But the technical barrier to that jump is low (MIT-licensed, and someone has already forked it to charge), so this differentiation won't hold. What the original can still defend is the "original" name, trust on privacy, and update frequency.

9. What others can learn

• Look for "a personal data export that users suddenly have after a big platform removes a feature or moves it to local storage" (timelines, chat history, health, listening history, photo EXIF), and turn it into a vertical video that's worth posting. It's the same template as Wrapped, and the output itself is the ad.
• On monetization, copy timelinevisualizer.net: keep the free version as is, sell Pro as a one-time purchase, and charge for the things that make the video better to share: background music, watermark, stats cards, styles. What the original doesn't do is where the copycats' revenue comes from.
• Distribution playbook: the author posts sample videos plus direct links on X/Threads → local creators make tutorials → localized-language SEO (Naver, Indonesian) → on stores, use the same name plus "Original" to guard against clones. For small-language markets (Indonesia, Vietnam), localize the store copy first.

10. Still unclear

• The specific likes, reposts and views on the author's X post weren't captured (the x-radar corpus doesn't include this account).
• Whether it ever appeared on GitHub Trending, and what rank it hit on which day, is unverified.
• Of the 389k APK downloads, we can't separate how many are the same users re-downloading on updates; actual users may be on the order of 10~200k (estimated).
• The traffic and Pro revenue of the clone sites are unknown.
• Worth watching whether there's another wave around year-end (the December "year in review" season).

Sources

• Play store page: play.google.com/store/apps/details?id=dev.mahlernim.timeline…
• GitHub: github.com/mahlernim/google-timeline-visualizer (releases download counts from gh api, 2026-11-06)
• Author's X: x.com/mahler83/status/2089260854940479929, x.com/mahler83/status/2090261613467304447
• Author's homepage: ahn-lab.org/ (Associate Professor, Department of Pharmacology, Inje University College of Medicine)
• 디에디트 IG:www.instagram.com/p/DcQn7WeIDt8/
• Threads:www.threads.com/@enppopi_0720/post/DcRFsrxnWNR
• Naver: m.blog.naver.com/twin_n/224391718452, m.blog.naver.com/9reeyoun/224392502898, blog.naver.com/sk3374/224385616214
• TikTok: TikHub search for "timeline visualizer" and "linimasa google maps video" (2026-11-06)
• Copycats: www.timelinevisualizer.net/, timelinevisualizer.world/, www.googlemapstimeline.com/, Play com.istimewadev.timelinesvisualizer, com.journeyreplay.traveltimeline
• trendshift:trendshift.io/repositories/174073
• Our database: googleplay (app_profile / app_day / chart_rank), github (repo_profile), as of 2026-11-06