MonoPaint

A small drawing app for Supernote Manta. Pressure-sensitive brushes, textured pencil, dotted grayscale shading, and a blending stump for sketching on e-ink.

Download the latest APK · All releases and release notes

• Round, Flat and Filbert brushes with pressure and tilt, plus oil paint that runs out and smudges.
• Wet canvas blending (with optional gravity), and a brush pen that pushes paint around with water.
• Pencil, airbrush, eraser, blending stump, flat and gradient fills, and shapes.
• 65 grayscale shades, an eyedropper, a swatch palette, and an eraser color for any tool.
• Up to 8 layers per page, multiple pages, undo/redo, and custom saved tools.
• Portrait or landscape for either drawing hand, plus lockable pinch zoom.
• Saves locally with automatic recovery. No account or network access.

Tool and feature guide: what every icon does and how to use it.

1. Download monopaint.apk from the latest release (not the source ZIP).

2. Install Google's Android SDK Platform Tools on your computer and open a terminal in the folder containing adb.

3. On the Manta, turn on Settings → Security & Privacy → Sideloading. Connect it by USB, unlock it, and accept the debugging prompt if one appears.

4. Run the commands below, replacing the APK path with your download location:

   adb devices
   adb install -r /path/to/monopaint.apk
   adb shell am start -n dev.tilesmile.supernote.paint/io.github.mpdairy.monopaint.PaintActivity

   On Windows PowerShell, use ./adb.exe; on macOS/Linux, use ./adb if it isn't on your PATH. If multiple devices appear, add -s SERIAL after adb. If a device is unauthorized, approve the prompt on the tablet and retry.

For updates, repeat adb install -r with the new APK. The app ID remains dev.tilesmile.supernote.paint, so releases signed with the existing key also update the earlier TileSmile and Mattelier apps. Do not uninstall first: uninstalling deletes paintings still kept in the app's private storage.

There is no Save button: MonoPaint saves as you work. A New painting is kept inside the app until you name it with Menu → Save painting as…; from then on it saves to that file by itself, and Save painting as… again makes a copy under a new name and keeps working in the copy. Once you allow file access, which MonoPaint asks for at launch, paintings are .mpaint files in Document/MonoPaint on a Supernote (Documents/MonoPaint on other tablets), where they survive uninstalling the app. Until then they stay in the app's private storage, and uninstalling deletes them. See the guide for details and PNG conversion.

This is an early, unofficial app tested on the Supernote Manta (1920 × 2560) and Nomad (1404 × 1872), both arm64. Other tablets are unverified: the fast e-ink path needs a supported Supernote screen, and other tablets use the slower Android drawing fallback. Undo history does not survive a restart.

If you try MonoPaint on another tablet, open an issue with your device, firmware and app versions, whether pressure/tilt works, and how live ink, grays, and selection refreshes behave. Test on a new painting first.

See building, testing, and publishing and contributing. Technical research notes are in docs. Earlier notes use the working names TileSmile and Mattelier; compatibility details are in the development guide.

MIT licensed. The pen bridge includes MIT-licensed work from AnimInk; its attribution is retained in THIRD_PARTY_NOTICES.md and inside the APK.