I'm launching dither this Wednesday (Sept 23rd) and wanted to say hi before then.
The short version: I loved Things 3's design but got tired of it being Apple-only, and every cross-platform alternative I found was a subscription instead. So dither is built around the same idea one-time purchase, no subscription, no account, your data stays yours but on Android, iPhone, iPad, Mac and Windows, from one codebase.
dither is a premium to-do app. One-time purchase, no subscription - on all platforms
-Reminders that actually remind: re-fire until you act, not a single notification you'll miss
-Task dependencies: lock a to-do until its prerequisite is done
-Scratchpads: markdown pages, to-dos, attachments and hand-drawn scribbles on one surface
-Your own cloud folder for sync — Drive, Dropbox, iCloud, anything — no account, no server we run
-Full export, always — JSON and Markdown, even after the trial ends