Ideas

A chore reminder that reacts to the weather and what's happening at home, not just a fixed schedule

A lot of housework depends on the weather, visitors, or another job being finished, so a fixed schedule doesn't always help. This reminder would still handle the regular jobs, like laundry on Thursday evening, and also speak up when heavy rain is forecast (check the gutters), when guests are coming tomorrow (tidy up), or the day after a job that needs a follow-up (fold yesterday's washing). Everything would live in one simple list for the household. It could read the local weather forecast and let you add your own events, like a visit, that trigger the right chores.

Asked for by a commenter in a Hacker News thread about things people wish existed

A tracker for which registrar holds each of your domains and where its DNS points

People who buy domains from the cheapest registrar lose track of where each is registered, when it renews and which nameservers it uses. Add domains manually or by lookup and see renewal dates and nameserver changes in one list.