• Home page: dithr.github.io
• Web version: dithr.github.io/app
• Android app + source code (MIT License): github.com/redphx/dithr

I bought several NFC-powered eink displays (from Good Display, Waveshare, Xteink, EZ Sign...). I didn't like that I had to install different apps for different displays (and I don't trust them), so I decided to make my own.

You can use this to prepare images for other displays from TRMNL, Seeed Studio, Xteink... too.

Some features:

- Privacy first: No trackers. No ads. No uploads. No servers. All on-device.

- Open source

- Mobile-optimized UI: the UI is designed with mobile users in mind.

- Multiple dithering methods: supports error diffusion, ordered dithering, halftone patterns...

- Simple yet powerful canvas editor: supports layers, images, texts, shapes...

- Direct hardware sync: sync dithered image directly to supported devices, including Waveshare, Good Display, and EZ Sign displays.

AI usage disclosure

This is not a vibe-coded project. I used Claude (free tier) to assist me with creating shaders and the history + layers manager. Other than that I code it myself (took me 3 months but I learnt a lot from it).

I hope you'll find it useful.

Thank you.

The screen/badge is from Good Display, 3.6 inch 400x600, $38. The colors are a little dull but it still looks nice. I bought the NFC version, but there is a BLE version (from picksmart) if you want that. Refresh time is around 15s. The screen ratio is 4:3, perfect for displaying game posters.

I'm also developing a free + open-source app for dithering + transfering these images to eink screens via NFC+BLE. So far it supports most NFC screens from Good Display, Waveshare, Xteink Tong Card and Reink (iPhone case). BLE support will be added later.

I'm looking for testers with Android phone + NFC eink screens.

Thank you.

Edit: the Dithr beta app is here: https://github.com/redphx/dithr-beta

There are many dithering tools but none of them are designed for eink screens/devices so I decided to make one.

Goals of this project:

- Support as many eink devices as possible. You'll no longer need different apps for different devices.

- Fast & flexible image editor

Supported devices so far:

- PhotoTag keyring (via BLE)

- GoodDisplay 1.54 + 4.20 4-color screens (via NFC)

Upcoming:

- Xteink Tong Card

- Other GoodDisplay screens (need testers)

BLE can be used on Web & app versions.

Due to Web NFC's limitation, you can't transfer the image via NFC on the web version. You'll need the Android app for that (same features as the web version but with NFC capability). In theory I could build an iOS app too, but I don't have any iOS devices.

Web stacks: Svelte + FabricJS + Capacitor

The project will be free and open-source when it's done.

If you want to test or add support for new device, drop a comment or send me a DM.

Thanks.