P 
Plunk
An open-source email platform for transactional and marketing sends.
NOT REALLY
why this verdict
Keep it — OpenAI has not replaced it
OpenAI's version overlaps, but does not finish the email job, so this one is still worth keeping open.
- A named launch, not a vibe named, unlinked
- Codegen makes rolling your own sender look deceptively easy. OpenAI, March 1, 2025 — no announcement link recorded yet.
- How much of the job it covers not the job editorial call
- Parts of it. The job still needs the tool to get finished.
- Is there a free way to do it? yes
- 1 of 2 listed replacements have a usable free tier: Resend.
- What the call is worth nothing to cancel
- No paid entry tier tracked, so there is no subscription to cancel.
Reason composed from the fields above missing: announcement linked recorded: free replacement listed recorded: two or more escape hatches
- Threatened by
- OpenAI
- Since
- March 1, 2025
- List price
- free
- Per year
- —
The backstory
Plunk targets the developer who wants one API for both product emails and campaigns, self-hostable if they care. The AI-generated-app wave multiplied the number of small projects needing exactly that, and self-hosting an SMTP reputation is still miserable enough that most people pay.
Escape hatches
R 
Resend Hosted, better docs.
resend.com open_in_new L 
Loops Nicer campaign builder.
loops.so open_in_new1 of 2 replacements have a usable free tier.