All tools
Keeping customers · 3 of 110 stories
SendGrid
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 |
|---|---|---|---|---|---|
| Rytr | Email service in the founder's tool list; the company ran a two-week welcome email series to turn free users into paying ones. | C | Starter Story, 28 November 2021: I Built A Simple AI Writing Tool That Makes $60K/Year | ||
| My AskAI | Listed by the founder as an email service of the business. | C | Starter Story, 18 June 2024, interview with Mike Heap: I Built A $300K/Year AI Business For Less $50 Bucks | ||
| fastwrite.io | Sends the newsletter. | C | fastwrite.io Datenschutzerklärung (privacy policy), version of September 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.
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
Keeping customers, with the number of stories that use each.