Independent app studio
Small, precise apps for the world around you.
Sapphire Prism Labs builds focused tools that each do one thing beautifully — computed on your device, with nothing tracking you.
On-device
Privacy-first
Independent
What we make
One small, precise app at a time.
Sapphire Prism Labs is an independent studio. We build focused tools that do one thing beautifully — and respect your data while they do it.
The studio
Named for the prism: ordinary light, taken apart into something you can finally see.
On-device by default
The math runs on your hardware. No servers of ours sit between you and your data.
Privacy as a feature
No accounts, no ads, no analytics, no third-party SDKs. There is nothing to opt out of.
Considered design
Every reading earns its place on the screen. Calm, legible, and quick to grasp at a glance.
Saturate is coming to the App Store.
An Apple Watch oxygen meter for hikers, climbers, skiers, and anyone curious about the air they're breathing.
See how it works
Coming soonApp Store · watchOS