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A free open-source cat mascot for apps that stays visually consistent across new poses and scenes, for builders who don't want a generic AI-generated look.
FreeOpen source
What to know▼
How it works
Pins each new generation to fixed reference images and a locked style prompt to keep the mascot consistent.
Pricing
Free for commercial use.
Best for
Developers adding a consistent character to onboarding flows or chatbots.
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An open-source, template-based design tool for building App Store and Play Store screenshots, feature graphics, and preview videos entirely in your browser or desktop app, with no account or upload required.
FreeNo sign-upData stays with you
What to know▼
How it works
pick a template, drop in your app screens, and export every required store size, including MP4 previews
What's different
an optional AI agent can build the whole listing from raw screenshots
Best for
app developers and designers preparing store listings
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A free, open-source browser tool for designing WebGL gradient backgrounds, exportable as a raw shader, CDN script or no-code iframe embed — built for developers adding visuals to sites.
FreeOpen sourceCan export my data
What to know▼
How it works
Lets you design WebGL gradient backgrounds in the browser, customizing colors, flow speed, noise and grain live, then export as a raw WebGL shader, a lightweight CDN script, or a zero-code iframe embed link.
Pricing
Free and open-source.
Best for
Developers who want to add a customizable animated gradient background to a site without writing shader code from scratch.
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A free, open-source grid tool for artists — perspective grids, composition overlays, an art projector, paint-by-number and an Instagram grid splitter — kept free where other tools paywall them.
FreeNo sign-upOpen source
What to know▼
How it works
A free, open-source grid tool for artists offering 9 grid types, including an Art Projector, Paint by Number, and an Instagram Grid Splitter.
What's different
Keeps perspective grids, composition overlays and diagonal lines free, where competitors paywall them.
Pricing
Free, MIT licensed.
Best for
Artists who want grid tools without paying for features other apps lock behind a paywall.
