01
One landing, one ad campaign
Every idea gets a single page and a Google Ads campaign. Real clicks, real cost-per-lead data — before a single line of product code is written.
rathgeber.dev — build in public
Stéphane Rathgeber
I build small SaaS products and kill them fast when the market says no.
This page is the whole portfolio: live products, experiments running on real ad budgets, and honest kills — with the strategy behind each call.
9
products
4
in validation
1
live today
€0
current MRR — all of them
01 — The board
Every product, its real status.
Unfold a row for the strategy — or the lesson.
01 sourcemylead 2026 Validating Lead-source attribution that writes into your CRM
Strategy
Fake-door test: one landing page plus Google Ads, and a GO/KILL decision after 6 weeks against thresholds written down before launch. Hard budget cap of €1,000, ads included.
02 refply 2026 Validating Flat-fee affiliate platform for SaaS
Strategy
Same playbook as sourcemylead: fake-door landing, Google Ads traffic, contractual GO/KILL thresholds read after 6 weeks, €1,000 cap. Launched two days behind so the two tests never compete.
03 redemo 2026 Validating Product demo videos that regenerate on every release
Strategy
Total dogfooding: the demo video on redemo's own landing page is generated by the very pipeline the product sells. If the pipeline can't sell itself, that is the answer.
04 stareply ~2024 POC AI-written replies to Google reviews
Strategy
Freemium aimed at the French market: 10 AI-written replies per month for free, paid plans for volume.
05 ludotracker ~2023 Beta Board-game collection & plays tracker
Strategy
Free, built for the hobby: track a board-game collection and log plays. No monetisation experiment here — not everything has to be a business.
06 zerotrusttransfer 2024 Live Digital vault & zero-knowledge file transfer, hosted in France
Strategy
Two linked modules: ZeroTrust ID (identity.zerotrusttransfer.fr) for encrypted identity documents, and ZeroTrust Share (share.zerotrusttransfer.fr) for two-key encrypted vaults. Public communication started July 14, 2026.
07 IdeaScorer 2025 Beta Scores your SaaS idea 0–100 from real signals (Reddit, HN, GitHub, Trends)
Strategy
Eat-your-own-dogfood tool: the same market-signal scoring used to pick which SaaS ideas on this page get a validation budget.
08 MonLogicielPraticien 2026 Validating All-in-one practice software for wellness practitioners (agenda, patients, billing)
Strategy
Different validation channel: free practice audits run through a Facebook community of practitioners, instead of paid ads. GDPR-first, hosted in France.
09 Gaina 2026 POC In the works — details soon
02 — Method
How an idea lives or dies here
02
An honest fake door
The signup form is a fake door, and it says so: “private beta, onboarding within 48 hours.” Nobody is ever told a finished product exists.
03
Contractual GO / KILL thresholds
Thresholds are written down before launch and read after 6–8 weeks. No reinterpretation, no extension because it “almost” worked.
04
€1,000 per idea, communicating vessels
Each test is capped at €1,000, ads included. Whatever a killed idea doesn't burn flows to the best-performing one still on the board.