Founder here. 6 years ago, in 2015, we set out to build Matterlist (https://matterlist.com/), a to-do list app to replace Wunderlist (and Astrid, if anyone still remembers it). Here’s my old HN comment about it: https://news.ycombinator.com/threads?id=VladimirGolovin&next.... We formed a team (self-funded out of my pocket, no venture capital), built the mobile versions, released them -- and failed to get any adoption.
To cut our costs, we’re releasing Matterlist as a fully free app (no up-front price, no subscriptions, no in-app purchases) with local-only data storage -- Matterlist now stores data on your device only, and you can export and import the database for manual backup.
The updated mobile app is now available for both iOS and Android. Unfortunately, the desktop / web version didn’t make it, and currently there are no plans to release it, so Matterlist will remain a mobile-only app.
If you have any questions, I’ll be happy to answer.