Jarvis322/macos-sysdata · Jarvis322

"System Data" can finally be opened: a free Mac utility from a Turkish developer gained 957 stars in a week

What it is A free Mac menu-bar app that breaks the "System Data" entry in Storage settings, which you can't open, into about 50 categories, showing how big each is and whether it's safe to delete, and showing you the commands before anything gets removed.

Why it took off The developer's own Turkish-language X account posted a tweet that got 370k views, pushing it past a few hundred stars. In late October, macOS 27.2 made many people's System Data jump by tens of GB, and the name matched users' exact problem, so Trendshift, repost accounts, and the Chinese developer community kept passing it along.

BHow you could follow it Don't build yet another Mac storage cleaner. Copy the approach: pick a confusing, unopenable label on a platform (Windows' system reserved, Android's "Other", developer caches), use users' own words as the name, explain before deleting, launch through your native-language account or community, and ship one to two weeks after a major system update.

Grade B: the approach is clear and copyable, and the download numbers show the demand is real; but the Mac cleaner space is already crowded, the macOS 27 wave has passed its peak and others are copying it, and its first wave relied on the developer's accounts with hundreds of thousands of views, so a different label and timing are needed to have a chance. Circulating in small circles

Data (updated daily) · Repo created 2026-09-05 · 2,023 stars · 7 days +536: GitHub · stars
Data 2026-10-09 → 2026-11-08 (31 days, 31 observations). Points before 10-28 come from deeply / archive backfill, not every day has one

In Mac Storage there's a grey bar called "System Data" that often takes up tens or hundreds of GB, can't be opened, and Apple doesn't explain it. A Turkish indie developer built a free tool to break it down; in September, one of his own tweets got it to nearly 1,000 stars, and in late October macOS 27 made that grey bar thicker for many people, adding 957 more stars in a week. This piece explains why it stood out in a space packed with cleaning apps, and what you can take from it if you want a project that earns stars.

One Turkish-language tweet

On Sep 2026, 6, Turkish tech blogger Yiğit Can Polat (@yigitech on X) posted a Turkish tweet that roughly said: "macOS System Data shows 70 GB, and Apple won't say what's inside. I wrote a small app… open source, free." The tweet got 2,614 likes, 187 reposts, and about 374k views. He later said it reached 24 stars in under 300 hours.

The project is called System Data Unpacked (repo Jarvis322/macos-sysdata), created the night before. By mid-October it had reached about 940 stars, then largely stalled: from Oct 17 to 30, it gained only 34 stars over two weeks.

Then came Oct 31 +172 and Nov 1 +340. By Nov it had 6,1,972 stars and 73 forks, with +957 in the last 7 days, while the 7 days before that added only +17 (GitHub, 11-06).

What it is

A Mac app that can open as a window or sit in the menu bar. It breaks the unopenable "System Data" entry in Settings into about 50 categories: simulator runtimes, Xcode symbol caches, package-manager repos, VM disks, system logs, each app's data directory, and even separate entries for models under Claude Code, Codex, Ollama, and Hugging Face. Each entry shows its real size with a tag: Safe (fine to delete), Review (look before deleting), or Manual (do it yourself).

The first paragraph of the README is the user's question: "On a developer's Mac, open System Settings > General > Storage, and "System Data" is often the biggest row, with no way to see inside." The next line draws a boundary: "It isn't a cache cleaner: ~/Library/Caches is one small line among fifty, and it deletes nothing unless you ask."

What makes people willing to install it are a few details: it shows the commands before deleting anything; Review items go to the Trash first; operations needing root prompt for permission once, with no persistent background daemon; it makes no network calls by default, the only request being an optional daily update check; and it's signed and notarized by Apple. The biggest worry about cleaning tools is "will it break my computer," and these points address exactly that. These are also the points that V2EX and CSDN write-ups keep citing.

It's free, has no paid tier, and only has GitHub Sponsors. The license is proprietary: the source is public, but strictly speaking it isn't open source.

How the late-October jump happened

The timing lined up. macOS 27 launched on Sep 14, and 27.2 launched on Oct 26. Starting from 27, purgeable space was counted as System Data, and with Apple Intelligence models and Spotlight reindexing, Reddit's r/MacOS and r/mac and Apple Community were full of posts about System Data spiking after upgrades. At peak demand, one project had a name that matched the user's problem word for word.

The surge began on the fifth day after the 27.2 release. But where the +172 stars from Oct 30 to 31 came from is unclear: no single big post stands out. English, Chinese, and Japanese X were all checked, and it predates Trendshift's coverage. The likelier explanation is GitHub's own recommendation feed plus rising demand forming a positive feedback loop (inference).

After that, amplifiers took over:

GitHub aggregators and repost accounts: Trendshift ranked it #10-31 on the 17 daily chart; gittrend.io and Repo Radar AI posted short videos on Instagram, a YouTube Shorts video titled "Find Out What's Eating Your Mac's System Data" appeared, and directory sites like findthe.tools listed it.
Chinese dev circles picked it up later but in volume: after the GitCode mirror, accounts on CSDN started posting write-ups in batches (from 10-23, about 500 views each); it's in awesome-swift-macos-apps; it made linux.do's 11-04 monthly picks; and on V2EX 11-06, one post was titled "macOS's 'System Data' that eats over 100 GB can finally be opened and cleaned".
The developer kept promoting it: 11-01 posted an English tweet saying it "passed 1,500 stars", and 11-02 introduced the new Shrink feature in Turkish.
English media is just picking it up: it's on SlashGear's 11-06 list "14 Free Apps That Actually Add Helpful Features To Your Mac".

Where it hasn't shown up is also worth noting: Hacker News, Product Hunt, and major English X accounts haven't featured it. It spread through Turkish circles, the Chinese developer community, and GitHub repost accounts, and hasn't yet entered mainstream English circles.

And the stars aren't hollow. Across 53 releases there have been about 29.8k downloads; the v1.10.0 release by 10-23 alone got about 12.4k, an order of magnitude more than the star count (GitHub release download counts, 11-06), so people are genuinely installing it.

Why it works in a crowded space

Mac cleaning is an old category, and the open-source side is already crowded:

Project	Scale	How it differs
CleanMyMac(MacPaw)	Leading paid software	Subscription, one-click cleaning
tw93/Mole	74,015 stars	Terminal-based all-in-one deep cleaning
Pearcleaner	15,062 stars	Leftover cleanup after uninstalling apps
PureMac	7,652 stars, 2026-04	Open-source CleanMyMac
MangoDisk	5,331 stars, 2026-08	Cross-platform disk analysis and dedup
1architect/MacSpace	454 stars, 2026-04	Closest in positioning, also covers macOS 27 System Data, but far less buzz
DaisyDisk and others	Established paid tools	Draw a folder tree, don't say what's safe to delete

(GitHub stars, 11-06)

It doesn't have more features than these projects. It wins on three things:

The name is the search term. The question in users' heads is "What is System Data and how do I clear it?", so it's called System Data Unpacked. Others only need one line to describe it, "Finally, you can open System Data", which is the phrasing V2EX, SlashGear, and CSDN almost all used.

Do the opposite: explain first, then let you delete one by one. Others sell "one-click cleaning"; it sells transparency, trading trust for "every command is shown to you".

Fast updates, a new story every time. 61 days, 53 releases, and by 11-06 it was at v1.11.3. v1.11 added Shrink, which uses APFS's built-in compression to cut a chunk of size without deleting files, giving people another reason to share it.

But none of these are hard to copy. People on V2EX have long been posting about skipping CleanMyMac, which costs 598, and building a disk analyzer with Cursor in "half an hour." In Nov 3, someone posted Mac Tidy on X, with copy that nearly mirrors it: "Ever wondered what's hiding inside your Mac's System Data… So I built Mac Tidy — a free, open-source tool." And on TikTok, a paid Mac app called Mint has been running a video series since 10-31, titled "System Data, unpacked."

The person himself is the channel

Yiğit didn't start from zero. His Turkish X account already gets tens to hundreds of thousands of views per post: 10-29 a MacBook Pro news post 458k views, 10-31 a WhatsApp security post 177k views. He is pushing several of his own projects at once (MacWake, Matinee, etc.), a small one-person portfolio.

That is the real reason for the first wave: one tweet pushed the project past the "few hundred stars" line. Past that line, channels that pick projects by star growth (Trendshift, repost accounts, GitCode mirrors) can see it, and the distribution after that is free. Without your own account, you need a different first step.

If it were you

Bottom line: worth trying, but don't copy the Nth Mac system data cleaner; copy the playbook and apply it to a 'gray label' nobody has explained clearly yet.

Who it suits: developers who can write native desktop or CLI tools and understand a system's low-level details; ideally you already have a native-language community or an account with a few thousand followers.
Who it doesn't suit: anyone trying to squeeze one more into the Mac cleaning space. Mole, PureMac, MacSpace and Mac Tidy are already there, and the macOS 27 demand wave has already been mostly absorbed by them.
How to do it: find the thing on a platform that confuses people and can't be opened, and use its exact wording as the project name. Examples: Windows C: drive "System & Reserved" and WinSxS; iPhone/iPad "System Data" (analyzed on desktop); Android "Other"; caches from Docker, models and each language's package manager on developer machines. Follow its method: split it into categories, explain what each one is and what deleting it costs, show the commands before deletion, and make nothing phone home by default. The first line of the README should state the user's problem, backed by a long article that explains the mechanics, to capture the evergreen "how to clear it" searches.
How to get users: first get 300–1,000 stars from your own native-language account or community; don't wait for the English scene. Chinese communities like V2EX, linux.do and Juejin, plus local circles in Turkey, Japan and Brazil, are all viable starting points. Once past the line, Trendshift, repost accounts and GitCode will distribute it for you. Each later release should ship one feature that people can retell, paired with a "passed N stars" post.
When to move: the window for this kind of tool follows major OS releases. The next one comes when the vendor changes storage accounting, permissions or battery stats. The sweet spot is one to two weeks after a release, so have the product ready in advance. The macOS 27 wave has already passed its peak: daily additions fell from +340 at 11-01 to about +50 at 11-06.
Signs you're reading it wrong: if it's still stuck at one or two hundred stars two weeks after launch, with no repost account or directory site picking it up on its own, the gray label you chose doesn't bother enough people, or you lack the cold-start push. Also, if the vendor itself splits that category out in System Settings, the reason for this kind of project disappears.

GitHub repo ↗

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

Competitors

Name	Where	Launched	Scale	How it differs from this one
CleanMyMac	Other	2008	Leading commercial Mac cleaner; MacPaw/cleanmymac-cli also has 1,047 stars	Subscription-based, one-click cleanup; it's free, only breaks out System Data, and explains and gives commands for each item
tw93/Mole	Open source	2025-09	74,015 stars, +7 in 739 days	All-in-one deep cleaner in the terminal; it's a native GUI focused on System Data, with item-by-item explanations
Pearcleaner	Open source	2023-11	15,062 stars	Handles leftovers after uninstalling apps, not a System Data category
PureMac	Open source	2026-04	7,652 stars	General cache cleaner benchmarked against CleanMyMac; it says it is not a cache cleaner
MangoDisk	Open source	2026-08	5,331 stars	Cross-platform disk analysis plus duplicate finding; macOS only, framed in System Data terms
1architect/MacSpace	Open source	2026-04	454 stars, written up by Korben	Closest positioning (a System Data and Apple Intelligence cleaner for the macOS 27 recalculation), but far less buzz and iteration
DaisyDisk / GrandPerspective / OmniDiskSweeper	Other	Long-established	Veteran Mac disk visualizer	Only draws folder trees; doesn't say what's safe to delete or what deleting costs
macOS Storage settings	Big-company features	Built into the system	All Macs	System Data can't be opened, which is exactly the pain point it targets
MacSai / mac-cleaner-cli / cleardisk / Radix	Open source	2025-12 to 2026-05	750–2,100 stars	Each covers one slice: general cleaning, CLI, developer caches, visualization; it gathers them all under the one System Data entry point

Where users come from

Verified via the developer's own X post (in Turkish): 9-06 posted ❤2,614 👁374k (x.com/yigitech/status/2096381595993194536), claiming 300 stars in under 24 hours; 11-01 English post said "passed 1,500 stars"
Inferred Platform event: macOS 27 / 27.2 blew up System Data: macOS 27 released 9-14, 27.2 released 10-26; purgeable space started counting toward System Data, and Reddit and Apple community threads are full of "System Data exploded after the upgrade"; growth picked up 5 days after 27.2 release
Verified GitHub aggregators and repost accounts: Trendshift 10-31 daily chart #17 (novidadesia.com 10-31); Instagram gittrend.io (9-13) and Repo Radar AI (11-01) reels; YouTube Shorts; directory sites like findthe.tools and dotstore
Verified Chinese developer communities and GitCode / CSDN auto-content: multiple CSDN gitblog posts (starting 10-23), listed in awesome-swift-macos-apps, linux.do 11 April picks, V2EX t/1254924 (11-06), 80aj.com (11-06)
Verified Media listicle: SlashGear 11-06 "14 Free Apps That Actually Add Helpful Features To Your Mac", reprinted by ProstoMob
Verified Official site SEO long-form: macos-sysdata.yigitech.dev/macos-system-data, a tested explainer guide targeting searches like "clear system data mac"
Inferred HN / Product Hunt / paid promotion: nothing found in the hackernews or producthunt databases; no evidence of paid promotion

Why Jarvis322/macos-sysdata (System Data Unpacked) broke out

Research date: 2026-11-06. Data from the GitHub API, our github / hackernews / producthunt / x databases, and Jina / Exa / Brave search. Items marked "unverified" are inferences.

One line

A free macOS app by a Turkish indie developer (Yiğit Can Polat, X @yigitech). It splits the grayed-out, unopenable "System Data" entry in System Settings > Storage into about 50 categories, showing the real size of each with a Safe / Review / Manual label, and shows you the commands before anything is deleted. It took off in two waves: in September it cold-started on the developer's own Turkish tweet; in October it caught the widespread complaints about System Data bloating after macOS 27, and then regional GitHub repost and aggregator channels amplified it.

Data

Repo created 2026-09-05; as of 11-06 it has 1,972 stars and 73 forks (GitHub API, checked the same day). Data card: +957 over the last 7 days, with only +17 in the first 7 days; the single-day high was +340 on 11-01.
Day by day (github repo_day table): 10-17 941 → 10-30 975 (about 2.4 stars/day over two weeks) → 10-31 1,147 (+172) → 11-01 1,487 (+340) → 11-02 1,614 → 11-03 1,726 → 11-04 1,800 → 11-05 1,882 → 11-06 1,932. 11-01 was the peak; it fell steadily afterward but still shows net growth.
Downloads: 53 releases total about 29,800 downloads (GitHub release asset counts). v1.10.0 (released 10-23) about 12,400 downloads; v1.11.1 (released 11-02) about 6,700 downloads. That's an order of magnitude above the star count, so people are actually downloading and using it, not just starring it.
First wave: 9-06 developer posted a Turkish tweet: "macOS 'System Data' shows 70 GB, and Apple won't say what's in it. I wrote a small app… open source, free", ❤2,614, 🔁187, about 374k views (x.com/yigitech/status/2096381595993194536). He later said himself it hit "300 stars in under 24 hours". By mid-October it had climbed to about 940 stars and then mostly flattened.
Free: the README uses a proprietary license (source is public, but not open source in the OSI sense), has GitHub Sponsors enabled, and offers no in-app purchases or paid tier.

Competitors

Product	Where	Launched	Scale	How it differs
CleanMyMac(MacPaw)	Web / Mac paid	From ¥2008	Leading commercial cleaner; MacPaw/cleanmymac-cli also has 1,047 stars	Subscription-based, one-click cleanup; it's free and only "breaks open System Data", with commands for each item
tw93/Mole	Open source	2025-09	74,015 stars, +7 in 739 days	All-in-one deep cleaner in the terminal; it's a native GUI focused only on System Data, with item-by-item explanations
Pearcleaner	Open source	2023-11	15,062 stars	Handles leftovers from uninstalling apps; it covers categories within System Data
PureMac	Open source	2026-04	7,652 stars	General cleaner benchmarked against CleanMyMac; it isn't a cache cleaner and stresses that ~/Library/Caches is only one of fifty items
MangoDisk	Open source (Rust, cross-platform)	2026-08	5,331 stars, +7 in 329 days	Disk analysis plus duplicate finding across three platforms; macOS only, framed in System Data terms
MacSai / mac-cleaner-cli / cleardisk / Radix	Open source	2025-12 to 2026-05	750–2,100 stars	General cleaning, CLI, developer caches, disk visualization, each covering one slice; it gathers them under one System Data entry point
1architect/MacSpace	Open source / web	2026-04	454 stars; written up by Korben	Closest positioning ("System Data and Apple Intelligence cleaner", targeting the macOS 27 System Data recalculation), but far less buzz
DaisyDisk, GrandPerspective, OmniDiskSweeper	Mac apps	Long-established	Many long-time users	Draws folder trees without telling you what's safe to delete or what deleting costs
Apple's built-in Storage settings	Big-company features	Built into the system	All Macs	It's exactly the pain point: System Data can't be opened
Mint (DZG Studio), Cleeva, Mac Tidy, etc.	Mac App Store / TikTok / open source	2026-10 to 11	Very small	Tells the same "System Data" story, with far less buzz

Verdict: this space is crowded (veteran paid software plus several open-source repos with tens of thousands of stars). It isn't the first to do cleaning, but the positioning of "focused on System Data, explains every item, gives commands before deletion" had only been done before by small projects like MacSpace.

How it found users

The developer's own X account (verified, the main driver of the first wave): @yigitech is a Turkish tech blogger whose single posts often get tens to hundreds of thousands of views. For example, 10-29 a MacBook Pro news post 👁458k, 10-31 a WhatsApp security post 👁177k. The launch post 9-06 got 👁374k, bringing in the first few hundred stars. 11-01 He then posted the English "passed 1,500 stars" (👁1,645), and 11-02 a Turkish post introducing the new Shrink feature (❤84). He's also pushing MacWake (137 stars), Matinee (121 stars) and other projects of his own, a one-person portfolio.
Platform event (timing, strongly correlated, causation not verified): macOS 27 Golden Gate 9-14 shipped, 27.2 launched 10-26 (MacRumors / 9to5Mac). macOS 27 started counting purgeable space as System Data (Apple Community thread 256374312). Add the Apple Intelligence models and Spotlight reindexing, and Reddit and Apple Community are full of "System Data exploded after upgrade" posts (r/MacOS 1wz3z5d, r/mac 1wh2dv5, Apple Community 256363764, 256368978). The tool's name matched the exact problem people were searching for at peak demand.
GitHub aggregator and repost accounts (verified, second-wave amplifiers): Trendshift 10-31 daily chart #17 (per novidadesia.com's report at 10-31 08:18 UTC, when it had 1,355 stars). Repost accounts gittrend.io (9-13) and Repo Radar AI (11-01) posted reels, YouTube has a Shorts titled "Find Out What's Eating Your Mac's System Data" (around 11-01) and an explainer by Alex Hitt. Directory sites findthe.tools, dotstore, discovergit, arewecleanyet, mole.fit and hysenlabs (9-13 review) also listed it.
中文圈(已证实,滞后但量大):GitCode 镜像以后,CSDN 的 gitblog 账号批量出了多篇 SEO 文(10-23 起,单篇浏览约 500)。wangchujiang 的 awesome-swift-macos-apps 收录了它。linux.do 11-04 的月度精选、V2EX 11-06「macOS 那坨上百 GB 的『系统数据』,终于能点开清了」、80aj.com 11-06 都写了。
Media (just starting): SlashGear 11-06 ("14 Free Apps That Actually Add Helpful Features To Your Mac") and Ukraine's ProstoMob reposting mentioned it.
Self-built SEO content (verified): The official site macos-sysdata.yigitech.dev has a long-form article, "macOS System Data: what it is and how to clear it safely," with measured data, targeting evergreen high-volume queries like "clear system data mac."
Channels not found: HN (no post in our library with ≥5 points), Product Hunt, its own Reddit launch post, English-language X accounts with large followings, and paid promotion all turned up nothing.

The starting point of the 10-31 jump is still unidentified. 10-30→10-31 was already +172, earlier than the Trendshift article. Searches on X in English, Chinese and Japanese found no big matching post. Most likely: demand rose after macOS 27.2 launched, and GitHub's own recommendation feed and the Trendshift daily chart fed each other. Not verified.

Why it took off

The pain is widespread and was just amplified: almost every Mac user sees the grey System Data bar, and macOS 27 pushed it up by tens of GB on many machines (see the Reddit and Apple Community posts above).
The name is the search term: "System Data Unpacked" matches the user's question "what is System Data and how do I clear it" word for word, and the first line of the README asks that same question.
Cold start cost nothing: the developer's own Turkish-language X account posted one tweet with 370k views, and it gathered nearly 1,000 stars in September. Past that threshold, it became visible to channels like Trendshift and the repost accounts, which pick projects by star growth.
Trust design made people willing to install it: three-tier labels, commands shown before deletion, Review items moved to the Trash first, root operations via one-off osascript, no resident helper, no network by default, signed and notarized. The biggest worry about a cleaner is "will it delete the wrong thing," and these points answer it. The repost articles (novidadesia, CSDN) keep citing exactly these points.
Fast iteration: 53 releases in 61 days (v1.11.3,11-06). The list specifically covers Claude Code / Codex / Ollama / Hugging Face data, Docker and simulators. v1.11 added Shrink (uses native APFS compression to roughly halve size without deleting), which gave a fresh hook for a second round of sharing.
Developer Macs are the core audience: GitHub users are exactly the people whose disks fill with Xcode, node_modules and AI models.

Differentiation

Compared with one-click cleaners like CleanMyMac, Mole and PureMac, it does the reverse: explain first, then you delete item by item. It groups items by the System Data label in System Settings, explains what each is and the cost of deleting it, and shows the commands. Compared with disk visualizers like DaisyDisk, it tells you "what this is, whether you can delete it, and what happens if you do," rather than just drawing a folder tree.

This difference is half the reason it took off: it gave a crowded category one sentence people could repeat ("finally, you can open System Data"). V2EX, SlashGear and CSDN all used nearly that line. The other half was timing (macOS 27) and the developer's built-in audience. Technically it's easy to copy, and MacSpace and Mac Tidy already tell the same story.

How many people have seen it

Free, with no public revenue to speak of.
Not on HN or Product Hunt, and not written up by big English-language X accounts. It spread in the Turkish scene, the Chinese developer scene (V2EX, linux.do, CSDN) and GitHub repost accounts. 11-06 just made SlashGear's list article.
Assessment: circulating in small circles, now spreading into mainstream Mac media.

Copycats

Mac Tidy (X @Chandra_9899,11-03): "Ever wondered what's hiding inside your Mac's System Data… So I built Mac Tidy — a free, open-source tool." The copy closely follows it.
Mint (DZG Studio, TikTok, from 10-31): its "System Data, unpacked · Part 1" video series even uses the same wording, but it is a paid/store product.
twinfold (10-23,62 stars): "Free up space without deleting files," the same idea as v1.11's Shrink. Which came first is not verified.
MacSpace, Peel and MacSift are transparent cleaners that explain their reasoning, and they existed before or alongside it. They are competitors, not copycats.

What to borrow

Naming a product after a confusing label the platform itself uses (System Data, Other, Purgeable) makes the name a search term, and the user's question becomes the slogan.
For tools that touch data, make "explain first, execute second, show every command" the selling point. Trade transparency for trust instead of competing on feature count.
Major system updates that change storage accounting, battery or permissions are the demand window for tools like this. Prepare in advance and push within one to two weeks after the update.
Cold start: use your native-language social account to get the first 500–1,000 stars. Once past the thresholds for Trendshift, repost accounts and auto-generated GitCode/CSDN content, those channels distribute it for free.
Give each major release a new shareable hook (Shrink), and pair it with a "passed N stars" post to push another round.

Unknowns

The direct trigger for the surge around 10-31 (GitHub's recommendation feed? Trendshift? some Reddit, Threads or Telegram post that search didn't find?) is unverified.
GitHub's stargazer detail endpoint now returns nothing (empty / 404), so the quality of the accounts that starred it can't be checked. The fork-to-star ratio of about 3.7% is not abnormal, and downloads exceed stars by an order of magnitude, so star-farming is unlikely, but accounts were not checked one by one.
Whether the developer posted about it themselves on Reddit r/macapps or similar: search found nothing, which doesn't mean they didn't.
Monetization plans (Sponsors income, a future paid App Store version) are unknown.

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