Also last week version 2.2.1 of the Android App was released with a special theme for e-ink devices: https://github.com/wallabag/android-app/releases/tag/2.2.1
(Note that if you're using a device under Android < 5, you'll now need to use the app-release-legacy.apk file. F-Droid builds don't work anymore, GooglePlay store distribution still does)
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