One person built an "open-source Substance Painter" with AI in three weeks, and one YouTube video added 207 stars in a day

SubCraft is a 3D texture painting app written in Rust on GitHub, built by one person with most of the code written by Claude and Codex. The repo is 24 days old, has 354 stars, and 282 of them came in the last week. It isn't better than others. It caught a gap many people were waiting for, and a 3D tutorial channel happened to pick it as a topic. Below is what it hit, whether the playbook can work again, and how you can use it.

Five minutes

In 2026 Nov 2 19:55 (UTC), SubCraft shipped v0.2.0: it could open Substance Painter .spp projects and read .sbsar materials, and it had a macOS build for the first time. Five minutes later, the 20:00,3D tutorial channel InspirationTuts posted a 11-minute video titled "Substance Painter is Getting Cloned too?", with the SubCraft GitHub link as the first line of the description. The video went through the interface, brushes, layers, baking, and export, and its last chapter was titled "Will SubCraft replace Substance?"

By 11-06, the video had 100k views, 1,911 likes, and 329 comments (YouTube, 11-06). The repo's star count went from 11-03 to 85,11-04 to 292, a gain of 207 in one day. The next day, the X account CG_Vortex posted about it, 3D, with 25.7k views and 522 likes. Then came Bandor Tyrell, and Open Designer Cloud ("TextureCraft vs. SubCraft", 8,250 views), plus YouTube coverage in Indonesia, Turkey, and Korea, and a long-form article from MODELING HAPPY in Japan.

The most-liked comment under the video was just three words: "Marvelous Designer plz" (215 likes), meaning "clone Marvelous Designer next." Someone who said they'd done 3D for nearly 20 years wrote: "These companies trap users in paywalls, it's hard to get out." Others poured cold water: "ArtCraft already shipped its own texture app, TextureCraft, still in early testing." (147 likes)

How the gap appeared

Substance Painter is the industry standard for 3D texturing, an Adobe subscription costing roughly 50 USD a month. Starting late September 2026, a team called ArtCraft (storytold on GitHub) began using AI to rewrite Adobe's software as open-source Rust apps one by one. PhotoCraft got 77k stars, and PDFCraft and FilmCraft each got ten to twenty thousand. "Cloning Adobe with AI" became a topic, and on Oct 25 Hacker News had a post, "What Adobe v ArtCraft teaches us", with 100 comments.

On Oct 11, someone opened a proposal in the ArtCraft repo: "PainterCraft: an open-source Substance 3D Painter alternative written in Rust." He listed a wishlist: GPU painting with Rust and wgpu, non-destructive layers and masks, smart materials and wear effects, baking, export presets for Unity / Unreal / VRChat, and an interface an AI agent could drive directly. The proposal got 36 👍, followed by a dozen or so "+1" replies.

Two days later, on Oct 13, SubCraft's repo was created. On Oct 14 it shipped the first installable build, then nearly a release a day, over a dozen releases in three weeks. The repo includes CLAUDE.md, a handoff doc written for Codex, and a prompt specifically asking Claude to write the "edge wear" effect. About 44 of 400 commits are signed directly as "claude". The author's account was registered 2020 years ago, has 13 followers, and has only this one repo, no personal site and no X account. It looks like someone took that wishlist and had AI implement it item by item (inferred).

The README makes it clear who it's for. The top has two big buttons, "Download for Windows / Linux", then a line: "SubCraft is an independent project. It is not an official ArtCraft product and is not endorsed by ArtCraft." Below that come screenshots, a step-by-step tutorial, a "What's new" for each version, and an "Edit in PhotoCraft" link. The name is SubCraft, so it looks like one more member of the Craft family.

Nobody noticed for the first three weeks

Don't picture it blowing up on day one. It had 31 stars at 10-17, reached 74 by 11-01, and gained only 40 more over two weeks, about two or three a day. During that stretch it got picked up by open-source alternative directories like clonesof.com, someone packaged it for the Arch Linux AUR, and r/3Dmodeling had a post titled "I built a free, open-source alternative to Substance Painter" (the post wouldn't load, and the author and date are unverified). None of this moved the needle.

There was one real inflection point: the video. The jump in stars lines up exactly with the video's timing, and every other channel was secondary coverage after it. Whether the creator reached out, was paid, or found the project on their own isn't visible from the outside. The channel description links to a Blender add-on affiliate, but SubCraft is free, so no paid relationship shows up.

For InspirationTuts, "Substance Painter is getting cloned too?" is a ready-made viral title. They needed something that could be downloaded, opened, and demoed on camera. The official TextureCraft only went public around Nov 1 and was still in early testing. SubCraft already had an installer, screenshots, a tutorial, and could open Substance project files. At that moment it was the only thing they could film.

Beyond stars: thousands of real users

354 stars isn't much, but download counts tell the real story. GitHub release download counts (11-06): v0.2.0 about 2,050, v0.2.1 about 940, earlier versions roughly 690 combined, for a total of about 3,700, mostly the Windows installer. That's about 10 times the star count, which means people weren't just starring and leaving. They installed it and tried it. How many kept using it afterward, there's no data for.

Who it's competing with

The second row matters most. The wave's originator stepped in, two weeks later, and passed SubCraft on stars. SubCraft has no feature moat. Its advantages are being independent, arriving first, and being installable and usable, and all three erode over time. Others have already forked it into their own versions ("SubCraft Studio", etc.).

Can this move be repeated?

It can, but each time the window is only a week or two. Broken down, it's four steps:

1. Find an open slot that has been named but not filled. These are easy to spot: in the proposal thread of a popular open-source suite, the entries with the most 👍 and no official response yet. SubCraft's had 36 👍. The video's comments were also listing requests: Marvelous Designer (215 likes), Houdini, Nuke, SpeedTree, Cinema 4D, Character Creator.
2. Use AI to build a working version within days. It doesn't have to be complete. It has to download, open, and run one full workflow you can demo on camera. SubCraft had an installer by the second day.
3. Build a migration hook. Being able to open a competitor's project files is the thing that pulls in people who want to leave Adobe. SubCraft shipped this feature five minutes before the video went out.
4. Make the README something a video creator can film directly. Download buttons, lots of screenshots, a beginner tutorial, and release notes. A big channel needs a topic it can demo, not just a good repo.

The problem is after step four. All of this is meant to get you picked by a big channel, and whether you get picked isn't up to you. In the first three weeks SubCraft did everything it could on its own, and it only gained 40 stars.

If it were you

Grade B: worth a try. The method is clear and the cost is low, but the upside has a ceiling, and you're betting on two things. SubCraft shows that one person with AI can build an open-source project seen by 100k people in three weeks, but it ended at 354 stars, and the official version passed it two weeks later. The two bets: whether a big channel picks your project as a topic, and when the official team steps in.

Who it's for: developers who already know a specialized piece of software (3D, video, audio, CAD), who understand what people in that field complain about every day and what file formats lock them in; who can ship hard with Claude Code or Codex and put out three or four versions a week; and who want a project and track record that the professional community notices, not long-term maintenance of a large codebase.

Who it doesn't suit: anyone aiming for thousands or tens of thousands of stars (this category seems to top out around a few hundred; PhotoCraft's numbers came from the brand and the suite). Anyone who doesn't know the domain and just wants to copy Substance again (that spot already has four players: TextureCraft, SubCraft, SubstanceCraft, ArmorPaint). Anyone counting on charging for it (the community wants it free).

How to do it: stop building texture software. Pick one from the ArtCraft proposal thread and this video's comments that has lots of mentions and no official repo yet. Prefer tools with closed file formats (things like Marvelous Designer's .zprj or SpeedTree's .spm), and make v1 "can open the original project." Copy SubCraft's naming and positioning: it should be obvious what it replaces, and the first line of the README should clearly say "unofficial."

How to get users: email 3D news channels like InspirationTuts, CG Vortex, and Bandor Tyrell directly, with a 1-minute demo recording and a download link. Also leave comments under the original proposal saying "there's already a working one." Clone directories, AUR, and Reddit will bring some traffic, but on their own they only added 40 stars to SubCraft in two weeks.

When to move: when a proposal reaches 20+ 👍, you need a working installer within two weeks. ArtCraft went from opening the repo to releasing TextureCraft in about two and a half weeks. That's your window.

What would mean you read it wrong: (1) if SubCraft's stars stall below 400 over the next month and commits stop, these projects fade fast, and the only thing worth doing is the single week of attention; (2) if ArtCraft opens repos for all the tools named in the comments, the slots get filled in one go; (3) the reverse: if the next independent clone (say, of Marvelous Designer) gets covered by a big channel and passes a thousand stars, the path is wider than SubCraft suggests, and you should move fast.

Data and sources

• Repo: github.com/Aalzard/subcraft (README, release download counts, commit history, 11-06). Daily star counts recorded from 10-17 to 11-06.
• Video: InspirationTuts, "Substance Painter is Getting Cloned too?" (youtube.com/watch?v=XzUoUX59ujU). Views, likes, comment counts, and comment text are from YouTube, 11-06.
• X: a post from CG_Vortex3D, 11-03.
• Proposal: github.com/storytold/craft-launcher/issues/183 (opened 10-11, check 11-06 with 36 👍).
• Competitors: GitHub pages for storytold/texturecraft and armory3d (11-06); clonesof.com, AUR subcraft-git; Japan's modelinghappy.com/archives/71392.
• "Built by feeding the wish list to AI" and "no paid partnership" are inferences. The Reddit post is unverified.