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Software · Education & science

Kotoba

Kotoba is a dictionary, available on Linux: offline use.

  • Completely free
  • Linux
  • Open source

Overview

Kotoba is a dictionary, available on Linux.

Features described in its Flathub listing: offline use.

Requires an internet connection.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Japanese–English dictionary” — official website, 10 November 2026
  • “Fully offline: No internet connection required.” — Flathub, 10 November 2026
  • “Fully offline: No internet connection required.” — Flathub, 10 November 2026

At a glance

All of Kotoba is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

Flexible search: Look up words using kanji, kana, rōmaji, or English meaning. Responsive results: Get matches in a fraction of a second. Detailed entries: Readings, meanings, example sentences, and usage notes where available. Verb and adjective handling: Automatically recognizes and matches conjugated verb and adjective forms to their base dictionary entry. Kanji lookup by component: Insert kanji by looking up their constituent components. Wildcards: Use * to search by pattern, useful for suffix searches such as *問題. Bookmarks: Save entries to revisit later. Fully offline: No internet connection required.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Last technical check: 7 November 2026
  • Description from Flathub — AppStream (Flathub)

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