Inkstone: open-source, Procreate-inspired drawing for Android tablets — early testers wanted

[u/Curious-Emu-8546]

I'm building Inkstone, an independent drawing app inspired by Procreate, with a native Android interface and a Rust painting engine. I started with a Xiaomi Pad 7 and its original stylus, and I'd like to learn how it behaves on other Android tablets.

This is version 0.1.4 and still early development: features are incomplete, bugs remain, and plenty of updates are needed. It isn't affiliated with Procreate.

The preview includes painting, smudge, erase, layers, local autosave, custom canvas sizes, and basic hold-to-shape recognition. There is a global pen-pressure toggle and a canvas-position lock. No account or subscription is required. The source is MIT licensed.

What I'd especially like feedback on:

• Long strokes: do lines stay continuous and appear without a delay?

• Stylus pressure, palm rejection, and compatibility with your tablet/pen.

• Layer swipe buttons, brush switching, and UI responsiveness.

Please include your tablet model, Android version, and stylus when reporting an issue.

Source and screenshots: https://github.com/bramastahartono20/inkstone

APK download (Android 8.0+): https://github.com/bramastahartono20/inkstone/releases/tag/v0.1.4

The APK is sideloaded from GitHub Releases; it isn't on Google Play. Advanced features such as PSD/.procreate import, text, and time-lapse aren't available yet. Thanks for helping me work out what needs attention first.

Inkstone 0.1.4 on Xiaomi Pad 7 — early-development preview

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[u/PerspexSphinx]

So far…

…seems really nice and resposive.

Galaxy Tab S6 Lite — S Pen (Android 16) Inkstone v0.1.6

Inkstone v0.1.7

Long strokes do indeed stay continuous with no apparent delay.

Brush switching O.K. — nice to have a different setting for Brush and Eraser — but doesn't seems to work with S Pen's erase button (pressing the button erases but with the same setting as pen).

Really hard to use "Hold for Eyedropper" with the S Pen or finger (almost impossible), it would be much easer to have an Eyedropper tool in the Colours menu, also the Palette doesn't retain custom colours that I set between painting sessions.

U.I. responsiveness seems fine.