Four Sails is a small, family-run app studio. We make focused, paid apps that do one job properly: no ads, no accounts, and your data stays on your device. Each app is priced fairly, kept simple on purpose, and supported by the people who built it.
Our apps
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Fuel Log
Gas mileage and service reminders. Log every fill-up in seconds and see your real MPG and cost per mile.
About Fuel Log -
Pool Calculator
Chlorine and pH made simple. Enter your test readings and get exact doses using TroubleFreePool-method targets.
About Pool Calculator Meditation Timer
Coming soonDesk Health
Coming soonBill Reminder
Coming soonRelationship Counter
Coming soonWedding Countdown
Coming soonMoving Checklist
Coming soonSymptom Tracker
Coming soonPregnancy Tools
Coming soon
How we work
- Local first. Your data lives in a database on your phone. Nothing is uploaded unless you choose to export or share it.
- No ads, no tracking. Our apps have no advertising and no analytics in their current versions.
- Fair pricing. Every app has a useful free tier and a clearly marked paid upgrade, handled by the App Store or Google Play.
- Real support. Email support@foursailsapps.com and a person who works on the app will answer.