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Accessible • Open Source • GPL3 Licensed

Free software. Private by default. Yours forever.

Penko Software has the goal of building free, open-source software that works on any device, new or old, without ecosystem lock-in. No subscriptions. No ads. No tracking. Just software for everyone.

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Penko Plaza

Interactive Demos

100% Client-Side

What's new

Early Access

Penko Vox: Japanese v2.1 is out: the Kotoba Islands RPG, voice calls and more.

Learn more

Penko Reader 3.0 turns it into a full reading app: library, paged reader, read-aloud and RSVP.

Penko Soroban 2.0: a full abacus course from your first bead to mental math, in 16 languages.

Penko Tune is now a private player for your own music, with encrypted sharing between friends.

Explore Apps

Pick a category to browse its apps. Everything is local-first, works offline, and is completely free.

Learning

Penko Reader

v3.0.0-beta

Beta

An offline reading app for your own books: a paged reader with read-aloud and PDF notes, an RSVP word-by-word speed reader, and reading drills. No account, and nothing leaves your device.

Key Features
RSVP Speed Reading
EPUB, PDF & More
Read Aloud
OpenDyslexic Font
Reading Drills
Works Offline
CodeLaunch App

Roadmap

The next apps we're building, one at a time and in the open. Follow along on GitHub.

GitHub
  1. Office Suite

    Penko Calc

    Spreadsheet app with 100+ functions, JavaScript cell support, and offline capabilities. A free alternative to Microsoft Excel and Google Sheets.

  2. Office Suite

    Penko Note

    Rich notes application with smart organization, tags, and search. Your thoughts, organized and accessible.

  3. Office Suite

    Penko Slide

    Create stunning presentations with beautiful templates and smooth transitions. A free alternative to PowerPoint and Google Slides.

Our Privacy Philosophy

No fine print. Here is exactly what you get, and what you don't.

Trackers
0
Ads
0
Subscriptions
0
Open source
100%
Open Source Codebase

The source code of every Penko Plaza app is available for verification in its GitHub repository under the GPL-3.0 license.

Browse the source on GitHub
Read the full privacy policy

  1. Your data stays yours

    We do not collect, store, or sell any user data. Your data stays in your browser database.

  2. Free forever

    No subscriptions, premium tiers, or hidden paywalls will ever be introduced to the core PWAs.

  3. GPL-3.0, as-is

    All Penko Plaza apps are provided completely free of charge and as-is under the GPL-3.0 license.

  4. No warranty

    We offer no warranty or liability of any kind for data safety, usage, or errors.

  5. Works offline

    Every Penko Plaza app is built offline-first, so your tools keep working without an internet connection.

  6. Best-effort updates

    Updates and features are introduced on a best-effort basis as time permits.