All tools
Keeping customers · 1 of 110 stories
OneSignal
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 |
|---|---|---|---|---|---|
| Letterly | Used to communicate with users, according to the privacy policy. | C | Letterly privacy policy, last updated 1 January 2026 |
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.
Other tools for the same job
Keeping customers, with the number of stories that use each.