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Firebase Authentication
Who uses it, and for what
One row per story. The grade is for the claim that the business uses this tool, not for its revenue.
| Story | What it does there | When | Cost stated | Grade | Source |
|---|---|---|---|---|---|
| Guidejar | Handles sign-in with email and password, Google and SAML. | C | Guidejar security page with subprocessor list, read 25 October 2026 | ||
| MyFutureSelf | Manages user accounts and sign-in on iOS and Android. | C | MyFutureSelf privacy policy, updated 13 October 2026 | ||
| FairwayFX | Gives each device an anonymous user ID for analytics and crash reports. | C | FairwayFX Privacy Policy, last updated 31 December 2025 |
Grade A: the tool's maker or a payment processor confirms the use. Grade B: an independent report, or the tool is visible in public code. Grade C: the founder or the company says so.
Used in the same businesses
Other tools in the stories above, with the number of stories that share both.
Other tools for the same job
Running it, with the number of stories that use each.