NoctO₂ is a small, independent app. It’s free, it has no ads, and it’s built around one idea: your oximeter already knows when something’s off at night, so your phone should tell you, and if you want, the people who care about you.
Sleep oximeters are affordable and good at measuring, but their own alarms are easy to sleep through, and their apps are mostly for looking back the next morning.
NoctO₂ watches the readings live, all night, with alarms you set yourself. If an alarm goes unanswered, it can tell your family. And it does that without accounts, ads or collecting your data.
It’s made by one developer, in spare time, and shaped by the people who use it. If something would make it better for you, please say so.
Questions, bugs, a device you’d like supported, or an idea that would make NoctO₂ better: send it here.
For problems, please include your iPhone model, your oximeter model and what happened. The troubleshooting log (Settings → Diagnostics → Share) helps a lot.
Most questions are answered on the Support page, with pictures. Family questions are on the Family page.
NoctO₂