Eric Mollenthiel

Eric Mollenthiel

Solo developer in Lyon, making Aridelle

About

Solo developer, based in Lyon, France. I build small, private tools for people dealing with something hard on their own. I am currently working on Aridelle: a private case file where you log the facts as they happen, keep the documents that back them up, and can ask an AI assistant about your own file, deciding item by item what it is allowed to read. It came out of watching someone close to me go through a family conflict with everything scattered across two phones and a drawer. Keeping a file is free. The AI part is what I charge for, because the people who need this most are usually the ones who cannot afford a lawyer.

Badges

Tastemaker
Tastemaker
Gone streaking
Gone streaking

Maker History

  • Nestido
    NestidoThe shared custody calendar that fills itself in
    Aug 2026
  • Aridelle
    AridelleDocument the facts. Keep the thread. Build your case.
    Aug 2026
  • 🎉
    Joined Product HuntAugust 2nd, 2026

Forums

Nestido - The shared custody calendar that fills itself in

Nestido is a custody calendar for separated parents. State your custody rhythm once, alternating weeks, 2-2-3 or your own, and the months ahead fill themselves in: from then on you only record what differs. Moving the whole sibling group to the other parent takes two taps. It counts in nights, never in hours, and tells you how many nights with each parent over any period. One account is enough, the other parent has nothing to install. No messaging, no expense splitting, no ads.

Kotisso - Split shared expenses: flatshares, trips, separated parents

Kotisso keeps the books for any group that shares money: a flatshare, a trip abroad, separated parents splitting their children's costs. Everyone notes what they paid. Kotisso keeps the balances and proposes the shortest set of transfers to settle up. Four split modes, 48 currencies with the rate frozen at entry, receipt photos, CSV and PDF export, and it opens offline. The whole accounting side is free, and always will be. 16 languages, right-to-left included. No bank connection, ever.

What do you actually do with the evidence you collect?

I'm launching Aridelle on Thursday, and I'd like to ask something before I do.

Aridelle came out of watching someone close to me go through a family conflict. What struck me was not that they lacked evidence. They had it all: the texts, the letters, the dates. It was scattered across two phones, a drawer and their own memory, and every time they had to explain what had happened, they rebuilt the whole story from scratch.

So I built a private case file: you log a fact with its date, attach the documents that back it up, and you can ask an AI assistant about your own file, deciding item by item what it is allowed to read.

Here is what I'm unsure about, and where I'd rather hear from you than guess.

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