The list is short on purpose — every additional processor is another party holding your data and another review for you to do.
| Purpose | What it handles |
|---|---|
| Hosting and database | The application and your readings |
| Authentication | Sign-in, and nothing else |
| Email delivery | Alert and digest messages |
| SMS delivery | Alert text messages |
| Payments | Billing. Card details never reach us |
| Cellular connectivity | Transport for cellular units' readings only |
For a formal review we can provide the named vendors and their agreements. Ask and we'll send the current list rather than leaving you to infer it from a help page.