Recordings into tabs. Spreadsheets into documents.
León Developments is a one-founder software studio in Buenos Aires. We build focused tools that take the raw material people already have and hand back something they can use, starting with musicians and small product teams.
Products
Each one solves a single job end to end. The colored edge shows where it stands: yellow is live, blue is in beta, gray is a prototype.
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TrasteFiel
Live beta. Web app, free plan.
Turns a guitar recording into an editable tablature draft. It separates the guitar from the mix, detects the notes and exports MusicXML and MIDI for MuseScore or Guitar Pro. If the detection is not reliable enough, it says so instead of handing over a wrong tab. An Android beta is with testers.
Try TrasteFiel -
RecordPress
Live. Free tool.
Turns a SmartSuite CSV export into a branded, client-ready PDF. Everything runs in the browser, so the data never leaves the user's device, and there is no sign-up.
Open RecordPress -
SpecPack PDF
Beta. Setup slots open.
Builds supplier-ready apparel tech packs, with measurements, bill of materials and colorways, from product data that teams already keep in Airtable, Glide or Google Sheets.
See SpecPack PDF -
Pausa Mía
Prototype. In user testing.
Short, personalized guided meditations that play in the browser, in Spanish, with a guest mode that needs no account.
Try Pausa Mía
Founder
León Developments is run by Leonardo Apollonio, a senior full-stack engineer with more than eight years building production systems in .NET, Angular and React for banking, media, maritime logistics and energy companies.
He designs, builds and ships every product here, and uses AI assistants as part of the daily build loop.
Talk to us
Questions about a product, a pilot for your team or a partnership go straight to the founder.
leo@leonardoapollonio.com