Case studies
Proof you can follow.
The idea, the offer, the traffic and the one decision that made it work. Numbers included.
01Facturio · Bordeaux
Invoicing for French sole traders, built with Claude Code.
« I spent three weeks selling before writing a line. The product came after the first ten customers. »
Léa M.Founder of FacturioThe decision that made it work
Sell yearly rather than monthly: cash followed and churn disappeared.
The timeline
- Week 1: 30 calls with sole traders
- Week 3: 10 pre-orders at €99 a year
- Week 6: first version online
- Month 5: 41 customers, VAT handled by Stripe Tax
02Relance · Lille
Customer follow-up agent for tradespeople.
« The VAT & payments room saved me a four-figure mistake before the first invoice. »
Karim B.Founder of RelanceThe decision that made it work
Go through the chambers of trades rather than ads: one partnership is worth a thousand clicks.
The timeline
- Day 1: idea picked from the catalogue
- Day 10: strategy generated, then corrected
- Day 21: launch on Product Hunt
- Month 2: first partnership with a chamber of trades
03Kiosque · Nantes
Municipal information boards, generated with Charpente.
« The POC held up in the demo before the town council. The code went to production without a rewrite. »
Sophie R.Founder of KiosqueThe decision that made it work
Sell one town hall before aiming for a hundred: the first contract wrote the specification.
The timeline
- Day 1: problem described in Charpente
- Day 1: POC deployed in one session
- Day 4: demo before the town council
- Day 10: purchase order signed