Jack Apps
Small iOS apps, built one at a time
Every app here keeps what you enter on your own device. No account, no sync, no analytics.
Vial
A calculator and a record for reconstituted vials and pens
You type the numbers. Vial does the arithmetic and prints the expression behind every figure it shows. It offers no doses, no schedules and no drug information, and it is not medical advice.
Graphable
A graphing calculator with trace, roots, tables and fits
A scientific calculator and function plotter with the depth a class actually asks for: trace, intersections, roots, a value table and regressions, saved per course.
Birdsmouth
A framing calculator for feet, inches and fractions
Measurements the way you read them off a tape, and every calculation kept on screen in a ledger you can scroll back through, edit and total before you cut.
What is true of all three
Each app's own privacy policy says this in detail. In summary:
- Your records stay on your device. There is no server of ours, no account and no sync. Nothing you enter is transmitted anywhere.
- Nothing is measured. No analytics, no advertising, no crash reporter, no tracking. We hold no database of users and could not identify you if asked.
- Purchases only. The one thing that leaves the device is a purchase, handled by Apple and RevenueCat, and it carries none of your content.
- Bought once. Where an app charges, it charges one time for a permanent unlock. Vial also offers a weekly plan for anyone who prefers it.
Copyright 2026 Jackson Gathondu