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Thesis is a place where people pay a solo founder monthly, suggest one experiment for them to run, and read what happened — good or bad. This is one of those results.

Ana Ribeiro

Ana Ribeiro

Verified backer

Getting people to keep using small subscription apps after they sign up. Ten years doing it in-house, now on her own. Lisbon.

Sign-up emailsKeeping customersFirst-week experience
What they have proposedSince 19 Feb 2026

Backers write the experiment down; the founder builds and ships it inside their own product. A result here is evidence of the backer's judgement about what to try, not of them having built it.

3
ideas submitted
3
accepted
2
run and published
How those turned out
1 wins1 inconclusive0 negative

No single score is calculated. 2 results is a short history — read the results, not the ratio.

Recent resultsInconclusiveA launch-day post keeps sign-ups high for a monthMay 2026WinAsk people to invite a colleague right after their first exportJul 2026
Founder recommendation
MK

Ana wrote the only idea I have read that told me in advance how it could fail. She then ran it exactly as written.

A solo founder · AI writing tool

This page is Ana Ribeiro’s record as a backer. Their profile carries everything else they do here, including anything they run themselves.

Working with Ana Ribeiro

Ana Ribeiro proposes experiments here; some backers also take paid work from the founders who read them. There is no way to contact anyone through this site yet, and rather than put a button here that does nothing, we are telling you that.

When it exists it will be their choice to switch on, and any paid engagement stays ring-fenced from which idea gets picked — nobody selects their own invoice.