The European office suite. Built for what's next.
Docs, Sheets, Slides, Mail and PDF — designed in Europe, hosted in Europe, owned by you. No CLOUD Act. No data harvesting. Just your work.
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The suite
Five apps.
One opinionated suite.
Each app is built ground-up in Rust for performance, with native file formats and zero lock-in.
Alto Docs
LiveWord processor
Native .docx editing engine written in Rust. Open, edit, save — pixel-perfect roundtrip.
OpenAlto Sheets
SoonSpreadsheets
A blazing-fast spreadsheet engine. Formulas, pivots, charts.
Coming Q4 2026Alto Slides
SoonPresentations
Beautiful presentations with smooth transitions and live collaboration.
Coming Q4 2026Alto Mail
SoonEmail client
A privacy-first inbox. End-to-end encrypted, no AI training on your data.
Coming Q4 2026Alto PDF
SoonReader & editor
Open, annotate, fill, sign. The PDF reader that respects your files.
Coming Q4 2026Sovereignty
Your data stays
in Europe.
Microsoft 365 is a US-based service. Even when "hosted" in the EU, it remains exposed to the CLOUD Act, allowing US authorities to access European data. Alto is a different bet.
Switch to Alto
in 3 minutes.
Open your existing .docx files. No migration. No relearning. Just better.