Keeping customers · 13 of 110 stories

Resend

An email sending service for developers: an application calls its API to send emails such as password resets and order confirmations, and it also sends newsletters to a contact list.

Price: From US$20 a month for the Pro plan with 50,000 emails a month (read 13 October 2026) Free plan: yes, limited resend.com

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	Grade	Source
Postiz	Sends the email notifications of the product.	B	GitHub repository gitroomhq/postiz-app, metadata read 12 October 2026
Softgen	Sends Softgen's email, in the company stack that the current owner lists.	C	Softgen overview page by the current owner: The Original Full-Stack AI Builder
Vid.AI	Sends the emails from the app, such as sign-in links.	C	Vid.AI privacy policy and terms, last updated 27 September 2026
LLM Gateway	Delivers the transactional and product email: invoices, usage alerts, security and product notices.	C	LLM Gateway: Sub-processor list, version of 19 August 2026
ChatSEO	Sends the transactional email to users.	C	ChatSEO: Sub-processors, with a change log to 1 September 2026
AI Toolbox	Email-sending service named in the founders' TrustMRR tech list.	C	TrustMRR markdown profile: AI Toolbox, synced 14 October 2026
Pet Plus Us	Sends customers their portraits and order links by email.	C	Pet Plus Us privacy page, last updated 27 September 2026
FounderPal	Sends email; the founder lists it with ConvertKit for email marketing.	C	No Code Exits, 27 September 2024: How Dan Kulkov grew FounderPal to $100,000 revenue with free tools
Topical Map AI	Sends the transactional emails in the founder's stack, which his video lists next to his Topical Map AI build.	C	Pete McPherson, YouTube channel Code Playbook, 28 December 2024: How I made $100k last year from AI-coded apps
Lancer	Sends the transactional and marketing email.	C	Lancer: Privacy policy, read 15 October 2026
GenPPT	Sends the transactional emails, such as sign-in links and export notices.	C	GenPPT Privacy Policy, updated 26 September 2026
Launch Fast	Sends the personalized onboarding emails to new users.	C	Starter Story, 5 January 2026: I built a $25K MRR app with Cursor
Sleek	Sends the transactional emails to users.	C	Sleek terms of service (last updated 8 September 2026) and privacy policy (last updated 14 March 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.

Stripe12 Next.js11 TrustMRR10 OpenAI API8 Cloudflare8 X7 YouTube6 Vercel6 TypeScript5 Product Hunt5

Other tools for the same job

Keeping customers, with the number of stories that use each.

Discord21 Intercom11 Crisp8 Canny5 Customer.io5 Bento4 Brevo4 Featurebase4 ConvertKit3 HubSpot3 SendGrid3 Chatwoot2

Back to all tools