Leveret Avenue Computer Club is a small software studio making a handful of focused, well-made apps. No investors, no roadmap committee: just tools built to do one job well.
Napkin
A plain-text calculator. Write out what you're figuring, in words and numbers together, and it calculates as you type. Available now at napkin.plus.
Checkmark
A todo list that runs in your browser. Add an item, check it off, close the tab. No account, and it keeps working with the network unplugged. Available now at checkmark.app.
Schengen
A calendar for counting days against the Schengen 90/180 rule. It runs entirely in your browser: no server, no account, nothing to sign up for. Available now at schengen.fyi.
On the Workbench
A writing app and a few other small instruments are in progress. More here as they're ready.
Questions: hello@leveret.club
© 2026 Leveret Avenue Computer Club LLC · Springfield, Missouri