We're a small studio building tools that do their work on the device they run on. No accounts, no analytics, no advertising, no surveillance. Just useful, careful software.
Every product we ship is held to the same three commitments. They shape what we can and can't build, and they're why our software feels different.
What you enter and what we calculate stays on your phone. Servers are an absolute last resort, and we tell you when one is touched.
Our apps don't need an account. We don't ship analytics SDKs, ad networks, or third-party trackers. There's nothing to phone home with.
Estimates are clearly labeled as estimates. Confidence is shown when it matters. We'd rather say "we're not sure" than fake precision.
A vitamin D companion for iPhone and Apple Watch. Estimates how much vitamin D you produced today from sunlight using your Apple Watch's Time in Daylight, your skin type, your location, and what you ate. All on your device.
A short brochure with the headline numbers, the science we cite, and the privacy claims spelled out. Also where to point a link.