CapCut raised prices, and a self-taught developer wrote a free alternative in three weeks; 73 days later it has 14k stars

In mid-September 2026, a self-taught developer with little GitHub reputation posted on r/ClaudeAI: he had spent three weeks using Claude to build a CapCut alternative, and people had already stopped using CapCut because of it. The editor, called Concat, had 14,367 stars as of 11-06, and its installer had been downloaded about 450k times. It wasn't the first "open-source CapCut," and the earlier one already had nearly 100k stars. What it caught was CapCut's price increase and a rival going quiet at the same time. Below: how it took off, where the stars came from, and what routes are left if you want the same stars.

One post, one line: "written with Claude"

On 2026 Sep 15, a user named jub0t, Jareer A., posted on r/ClaudeAI with the title "I used Claude to write a CapCut replacement and now people are actually ditching CapCut for it". The repo was created 25 Aug, originally named WolfCut, and renamed Concat in early September.

The next day, tech news site anothernews.io published "A free CapCut replacement written with Claude passed 10,000 downloads". The author said he wrote it on a Claude Max subscription in about three weeks. At the time it had 2,300 stars, and its 25 releases had been downloaded over 10k times. He added in the post: completely free, no paid version.

On Sep 18 he also posted a Show HN, which got only 5 points and 3 comments. In the post he stated the motivation directly: "after sucking in millions of installs, CapCut put everything behind a paywall", and added: "I'm self-taught, and I relied heavily on Claude to build Concat."

He had previously built a Discord bot dashboard and a Tailwind component library, both with under 300 stars, and 694 GitHub followers (11-06). With no big-name backing, the first wave of traction came almost entirely from the story "one person wrote a video editor with AI in three weeks", and r/ClaudeAI readers are exactly the people who star open-source projects.

What it actually is

A desktop video editor written in Rust, with installers for Windows, macOS, Linux, and Android, and sideloadable on iOS. The README lists: automatic subtitles (Whisper running locally), text-to-speech and voice cloning, chroma keying, keyframes, 100 transition effects, multitrack, and export up to 4K 60. It's "no watermark, no account, no subscription, no upload". You download the AI models once in settings, and they work offline afterward. It also includes a built-in MCP server, so AI agents like Claude can call it directly to edit video.

Licensed AGPL-3.0, with a commercial closed-source license sold separately. The top of the README features a paid sponsor (a proxy service, with a discount code) and a Patreon donation link, with the text "Concat needs your donations to keep development going".

The feature list is worth a closer look: subtitles, voiceover, chroma keying, 4K, and watermark removal are nearly the exact items CapCut charges for, matched one by one.

Why now: CapCut raised prices, and the previous open-source flagship is being rewritten

CapCut is tightening. In the first half of 2026, CapCut adjusted its subscriptions, raising Pro from about $9.99/month to $19.99/month, and moved some export and AI features into the paid tier (whysogeek 08-24; CapCut help page "Why do some features require payment now"). Articles about "CapCut alternatives" have been steady all year.

The old "open-source CapCut" has stalled. OpenCut came out in June 2025 and now has 97.4k stars, but it's "being rewritten from scratch", the main repo hasn't been updated since Sep 24, and the web version is still the old one. A free CapCut you can download and use today has been an open slot.

Here's how others in the same space stack up:

(GitHub,11-06)

"Open-source CapCut alternative" is not an empty niche. Concat caught a window: CapCut's price hike pushed people out, and OpenCut's stall left them nowhere to go.

Where the stars came from: programmers first, then ordinary video editors

The numbers show two distinct phases:

Phase one (late August to early October) was the author's own posts. 08-27 r/foss, 08-28 r/coolgithubprojects (then still called WolfCut), and 09-15 r/ClaudeAI, then moved on to r/generativeAI and r/ClaudeCode. Small French sites like jiti.me and VseZavislo followed with their own coverage. HN didn't take off.

The second wave (from mid-October) came from short-video creators in several countries posting on their own. Search "concat capcut" on TikTok and you'll find a batch of videos with a few thousand to over a hundred thousand views (11-06):

• Vietnamese creator @100dayvibecoding posted around October 16–17 with 74k views and 1,712 saves. The opener: "🔥 A completely free CapCut alternative with no watermark and AI built in." The day it went out, Concat added 1,040 stars in a single day, the highest it has ever hit.
• @manuel.travelling, 10-11.1M views.
• @theaiimpact (53k followers), 10-2.02M views. Caption: "FREE CapCut Alternative with AI Features! No subscription, no watermark, no account." A row of checkmarks lists the features below it.
• Spanish-language @lluisjimenez.ugc took a different angle: "What makes it better than CapCut for me isn't the price, it's that my videos never leave my house." The video also quotes CapCut's terms of service from Apr 15.
• There are also Portuguese "CapCut de Graça?" (free CapCut?) videos, Turkish and Arabic (Algeria) ones, and Indonesian ones, plus a lot of "FREE CapCut alternative" reposts across Instagram and Facebook groups.

None of these videos are labeled as paid partnerships, and I can't confirm whether anyone reached out to the creators. You can still see why they wanted to post: "Free CapCut" works as a video title on its own, and the feature list reads straight off as the caption. The README has been translated into 26 languages and the app itself supports 26, and the website has one big download button above the fold. That's why creators in Vietnam, Spanish-speaking countries, and Portuguese-speaking countries could post it and have viewers actually be able to use it once they clicked.

The installer download numbers show who came in this wave: v0.2.5 (09-28) 46k downloads, v0.2.7 (10-13) 133k downloads, v0.2.8 (10-20) 214k downloads (GitHub, 11-06). The people arriving are no longer just programmers reading code. They're people downloading the installer and cutting videos.

Later, Neowin, TechPP (11-05), and LockerGnome (which covered the MCP angle of "let Claude edit your footage") also reported on it. Growth is slowing now: 7 days ago it was 1,760, the 7 days before that 2,211, but it still adds around 200 a day.

Where it falls short

Sorting GitHub issues by comment count (11-06, with over ten pages of opened issues), the hottest ones are:

• Graphics cards and old computers: NVIDIA cards with 8 GB of VRAM drop the device mid-export or freeze outright; old CPUs like the i7-2600 crash on launch; v0.2.5 has a "serious performance problem."
• The Android version is rough: media won't import, export is missing encoders, it won't open, and the UI has problems.
• No web version: someone asked for a WebAssembly build.
• Linux packaging: people are asking for Flatpak / Flathub.

It also lacks the thing phone-based short-video editing relies on most: template and asset libraries like CapCut's. The author said on HN he wants to build a decentralized marketplace for filters, effects, and templates, but it hasn't taken shape yet.

If it were you

Verdict: B. Worth a try, but don't build a second Concat. It proves a playbook: when a big company raises prices or locks features in its software, ship a "free, local, no account" alternative. List it against the incumbent's paid features, and one person with AI can have a usable version in a few weeks. Talk about it in AI circles first ("I wrote X in a few weeks with AI"), then get short-video creators to push "free X." The weak point is that the CapCut slot is already taken. FilmCraft and other projects from the same period have caught up, and OpenCut is coming back after its rewrite. The next opening will need another big company to raise prices.

Who it fits: people who can use AI to quickly write a complete desktop app and are willing to fix bugs and ship releases every day (Concat has shipped dozens of versions in just over two months), and people who watch software news and can move the week a major company announces a price increase.

Who it doesn't fit: anyone who wants to build another CapCut-themed tool (you'd be the fifth, with no story); anyone who can only make a demo and not an installer people can install and use (creators are pushing "download and go," and if it won't install, the second wave never happens); anyone who only publishes on GitHub without planning multilingual support and a download page (the second half of Concat's stars came from ordinary non-English users).

How to do it, ranked by how worthwhile:

1. Pick another software product whose price is going up: the author is already doing this, having released MageCAD ("open-source Autodesk Fusion alternative") and a hand-drawn explainer animation editor. Look for software that ordinary people use, that has recently raised prices or locked features, and that has no ready-to-download open-source option yet. Design, screen recording, subtitles, photo editing, PDF, and note-taking can each be checked one by one.
2. Cover what Concat left out: build the template, effects, and sound-asset library it lacks (someone has already asked for a sound library in the issues), or build a genuinely good phone editor, since Android is clearly where it's falling short. Submitting PRs to Concat also builds reputation.
3. Just the agent half: tools that let Claude and Codex edit video themselves (a Vietnamese creator already filmed "Codex using Concat's MCP to find images on the web and edit a video on its own"). Projects on this line still only have a few hundred to a few thousand stars, but ordinary users won't come for it, so the ceiling is lower than for an editor built for people.

How to get users: for the first wave, post "a free alternative to X, built with AI in Y weeks" in AI communities like r/ClaudeAI and r/ClaudeCode. Put the big company's name in the title along with "people are actually switching." At the same time, have three things ready: a website with a big download button, installers for every platform, and a README and UI in multiple languages. Then wait, or actively reach out to TikTok and Instagram creators in different countries who do "free tool recommendation" posts, and give them a line they can use as a title: "Free X Pro." Don't count on HN. Concat only got 5 points there.

When to move: follow the big company's price increases. Concat launched about half a year after CapCut tightened its paywall, and the demand for alternatives lasted several months. When the next company announces a price increase, aim to have a downloadable version within a month.

What would mean you read it wrong: ① after November, Concat's daily new stars drop to a few dozen, and the next version's downloads are less than half of v0.2.8's, which would mean ordinary users installed it and left, and the "free alternative" buzz was just a moment; ② within a few weeks of the OpenCut rewrite launching, it overtakes Concat's growth rate again, which would mean these projects compete on who claims the spot first, leaving latecomers no room; ③ conversely, if the same-template projects like the author's MageCAD also reach several thousand stars within a month or two, the playbook is reusable and worth copying quickly.

Data and sources

GitHub: jub0t/Concat repo page, README, Releases download counts, issue list, daily stars (10-16 to 11-06). Reddit: post titles from r/ClaudeAI (09-15), r/foss (08-27), r/coolgithubprojects (08-28), and r/BestGitHubRepos (10-05); upvote counts for the original posts were not captured. Hacker News Show HN (09-18). anothernews.io (2026-09-16). CapCut price increase: whysogeek (2026-08-24), CapCut help pages. TikTok: searches for "concat capcut" and "concat video editor" (11-06); view counts are as of the day of collection. Media: jiti.me, VseZavislo, LockerGnome, Neowin, TechPP (11-05). Similar projects such as OpenCut: their respective GitHub pages (11-06). Anywhere marked "inferred" or "can't confirm" is inference or unverified.