Pay once. Yours forever.
Laesi is a desktop app for Mac, Windows, and Linux. One price, one-time, no subscription, no cloud. Every language we ship — all 60+ of them — is included, with free updates for life.
- ✓All 60+ languages — every one we ship
- ✓Real lemmatizers: Voikko, spaCy, GiellaLT
- ✓Reader with knowledge-level highlighting
- ✓Books & subtitles: EPUB, TXT, SRT, VTT — plus MOBI, AZW3, DOCX, ASS, SSA
- ✓Wiktionary & Google Translate lookup
- ✓Browser extension (Chrome + Firefox)
- ✓AI Graded Reader + translate overlays
- ✓Anki export (all card types)
- ✓Custom languages & conlangs
- ✓Free updates for life
macOS 12+ · Apple Silicon · Windows 10 / 11 · 64-bit · Linux · .AppImage & .deb
Subscription fatigue is real.
Most reading apps in this category are subscriptions — typically $6 to $36 a month. At the high end that's over $400 a year, every year, for as long as you keep studying.
Laesi isn't. Pay once and it's yours. A few months of a subscription app can cost more than Laesi — and Laesi keeps working long after you'd have cancelled.
Laesi is yours. Buy it, download it, keep it. No servers we can turn off. No account you can lose. No data in the cloud. You study a language for decades — your tools shouldn't be on a meter.
System requirements
- macOS 12 (Monterey) or later
- Apple Silicon (M1 or newer)
- 4 GB RAM minimum
- 500 MB disk space
- Windows 10 or Windows 11
- 64-bit processor
- 4 GB RAM minimum
- 500 MB disk (includes WebView2)
- .AppImage or .deb
- WebKitGTK 4.1
- 4 GB RAM minimum
- Full Finnish & GiellaLT support
A few languages (Finnish via Voikko, the GiellaLT family) need an extra toolchain on Windows — Mac and Linux get the full set out of the box. Need an institutional or academic site license? Contact us.