Free sleep and oximetry tools
Genuinely free, and free in the way that matters: no account, no email, and nothing you load or type is sent to a server. Each of these runs entirely in your browser and forgets everything when you close the tab.
- Session viewerTurn one night of oximeter data into clinical metricsLoad a night from a Wellue Checkme O2 by CSV or straight off the device over Bluetooth, and get the charts and the thirteen metrics the paid dashboard shows: desaturation indices, time under 90%, cyclic heart-rate variation. Print the whole night to one page for an appointment.Needs: A recording pulse oximeterOpen
- Sleep apnea risk checkFind out whether your symptoms are worth investigatingA short checklist of the factors that genuinely predict obstructive sleep apnea, scored into plain English with a next step. Useful before you have any data at all, and the fastest way to work out whether recording a night is worth the trouble.Needs: Nothing but a minuteOpen
- Compare nightsPut two, three or four recordings side by sideLoad up to four CSV exports and see them on one time axis with every metric in a single table, best value marked. Made for before-and-after questions: a night on your side against a night on your back, or a first night at altitude against the fourth.Needs: Two or more recordingsOpen
- Oximetry results explainerMake sense of the numbers on an overnight oximetry reportType in whatever your report or app gives you, whether that is an ODI, a lowest SpO2, an average or a time under 90%, and get each number placed against the bands sleep clinics use, in plain English, with what it does and does not tell you.Needs: A report from any deviceOpen
- Altitude oxygen calculatorWhat blood oxygen should look like at a given elevationEnter an elevation, or pick a well-known town or trek, and see the air pressure, the oxygen actually reaching your lungs, and the SpO2 range a healthy visitor can expect before acclimatising. Add your own reading to see how it compares.Needs: An elevation, or a destinationOpen
Why these are free. PulseOxTracker sells one thing: keeping your nights so the trend is visible. The analysis itself is not the paid part, so there is no reason to hold it back. Use these as much as you like without ever creating an account.
Where to start
If you already own a recording oximeter, go straight to the session viewer and load a night. If you do not, start with the risk check: it takes a minute and tells you whether the rest of this is worth your time. If you already have a report from a clinic or another app, the results explainer will tell you what the numbers on it mean. The blog covers what the numbers mean once you have them.