Loops is developer-first email infrastructure — full REST API, official SDKs, transactional and marketing email unified. It is not a waitlist tool. There is no queue, no position assignment, and no referral system. If you need both a waitlist and email, Enlist handles both; if you only need email, Loops is the stronger choice.
Key differences
Loops collects contacts and sends emails. It has no concept of a queue — position tracking, idempotency on re-submission, and stable ordering are not features. Enlist assigns position inside a locked transaction and returns it in the signup response.
Using Loops as a waitlist means writing the queue yourself: the signup table, the race conditions, the position column, the re-submission handling. Enlist is the layer above: POST the email, receive position and total in the same response.
Loops tracks email analytics at the campaign level. Enlist writes delivery, open, and click events back onto each individual signup row — so you can see which specific person never received their confirmation without leaving the API.
Loops has no MCP integration. Enlist exposes create-waitlist, add-signup, and read-position over a hosted MCP endpoint — a coding agent can build and wire the full signup flow in one prompt.
Up to 500 signups on the free tier. Add the MCP server and your agent wires the whole integration in one prompt.