We build small, focused software for Apple platforms.
Zentsu LLC is a software studio working on native tools and apps for macOS and iOS. We favor private-by-default design, one-time purchases where the model fits, and shipping software that does a clear job without asking for an account.
Apps
Press
Available · macOS · Mac App Store
Convert MOV to MP4, HEIC to JPG, and PNG to WebP on your Mac, with size presets for Discord and email. Files never leave the machine.
Learn Japanese: 2,000 Words
Coming soon · iPhone
Practice core Japanese vocabulary by ear, with spaced review. Start with 500 words free.
Overload
Not on the App Store · iPhone · Apple Watch
Log your lifts and see the next target for every set. Add reps at the same weight, then add weight once every set reaches the top of its range.
How we build
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Native first
Mac and iOS apps written in Swift and SwiftUI, not cross-platform shells wrapped around a web view.
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Private by default
Our apps work without a Zentsu account or telemetry. When an app syncs, it uses your private iCloud storage instead of a Zentsu server.
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Pay once
One-time purchases over subscriptions, where the model fits. The version you bought keeps working.
Contact
For press, partnerships, or general inquiries: hello@zentsu.app.