Legal

Open source licenses

Nisatsu is built on open-source software. The public table below covers the web application, API server, and marketing website. The mobile dependency list is available inside the iOS and Android apps. Each library is used under its respective license. We are grateful to the maintainers.

Generated 2026-09-11 · 401 libraries

Mobile application

The libraries shipped in the iOS and Android applications are listed inside the app under Account → Settings → About → Open source licenses. The list there comes from the mobile package manifest. The lists on this page come from the web application, API server, and marketing website manifests. They overlap (React, etc.) but together capture the full attribution surface for each platform.

Bundled fonts

The web app self-hosts the following font, served from our own domain via next/font. It is not an npm dependency, so it is listed here by hand rather than in the generated table below.

Noto Sans JPSIL Open Font License 1.1

This Font Software is licensed under the SIL Open Font License, Version 1.1. The license is available with a FAQ at openfontlicense.org.

Dictionary data

Word meanings, readings, and glosses shown in stories and offered when you add a word to your vocab bank come from the following openly licensed dictionary datasets. They are data files rather than npm dependencies, so they are listed here by hand.

JMdict (Japanese)CC BY-SA 4.0
© Electronic Dictionary Research and Development Group (EDRDG). Used under the EDRDG licence (Creative Commons Attribution-ShareAlike 4.0). Powers the in-app dictionary search (a JMdict snapshot in our own database) and is also bundled in the AI service via jamdict.
JLPT vocabulary lists (tanos.co.uk)CC BY
JLPT N5–N1 level tags in the in-app dictionary derive from Jonathan Waller's JLPT Resources (CC BY), as mapped onto JMdict entries by the yomitan-jlpt-vocab project (Stephen Kraus, CC BY-SA 4.0).
Korean Wiktionary extract (kaikki.org)CC BY-SA
© Wiktionary contributors; machine-readable extract by kaikki.org (Tatu Ylonen). Used under Creative Commons Attribution-ShareAlike.
Open Multilingual Wordnet (Spanish)CC BY 3.0 / WordNet 3.0
Spanish synsets © Multilingual Central Repository (CC BY 3.0); English glosses from Princeton WordNet (WordNet 3.0 license), accessed via the wn library.

Websites & server

The table below combines the production dependencies of the web application, API server, and public marketing website. Click a name for the project's homepage where available; expand "License text" for the reproduced copyright / permission notice.

@apm-js-collab/code-transformer0.18.1
Apache-2.0
License text
@apm-js-collab/code-transformer-bundler-plugins0.7.3
MIT
@apm-js-collab/tracing-hooks0.13.0
Apache-2.0
License text
@img/colour1.1.0
MIT
License text
@jest/pattern30.4.0
MIT
License text
@jest/pattern30.5.0
MIT
License text
@jest/schemas30.4.1
MIT
License text
@jest/schemas30.5.0
MIT
License text
@jest/types30.4.1
MIT
License text
@jest/types30.5.1
MIT
License text
@pkgjs/parseargs0.11.0
MIT
License text
@posthog/core1.46.0
MIT
@posthog/types1.399.0
MIT
License text
@prisma/client-runtime-utils7.9.1
Apache-2.0
License text
@sentry/conventions0.16.0
MIT
License text
@tailwindcss/node4.3.3
MIT
License text
@tailwindcss/oxide4.3.3
MIT
License text
@tailwindcss/postcss4.3.3
MIT
License text
@tailwindcss/typography0.5.20
MIT
License text
@types/eslint9.6.1
MIT
License text
@types/eslint-scope3.7.7
MIT
License text
@types/estree1.0.9
MIT
License text
@types/istanbul-lib-coverage2.0.6
MIT
License text
@types/istanbul-lib-report3.0.3
MIT
License text
@types/istanbul-reports3.0.4
MIT
License text
@types/json-schema7.0.15
MIT
License text
@types/node18.19.130
MIT
License text
@types/node22.20.1
MIT
License text
@types/node22.20.2
MIT
License text
@types/node-fetch2.6.13
MIT
License text
@types/pg8.20.0
MIT
License text
@types/yargs17.0.35
MIT
License text
@types/yargs-parser21.0.3
MIT
License text
@upstash/ratelimitv2.0.8
MIT
License text
@webassemblyjs/ieee7541.13.2
MIT
License text
@webassemblyjs/leb1281.13.2
Apache-2.0
License text
acorn8.17.0
MIT
License text
acorn8.18.0
MIT
License text
balanced-match4.0.4
MIT
License text
baseline-browser-mapping2.11.1
Apache-2.0
License text
baseline-browser-mapping2.11.21
Apache-2.0
License text
brace-expansion5.0.9
MIT
License text
buffer-from1.1.2
MIT
License text
chalk4.1.2
MIT
License text
client-only0.0.1
MIT
dotenv16.6.1
BSD-2-Clause
License text
dotenv17.4.2
BSD-2-Clause
License text
eslint-scope5.1.1
BSD-2-Clause
License text
eslint-scope8.4.0
BSD-2-Clause
License text
esrecurse4.3.0
BSD-2-Clause
estraverse4.3.0
BSD-2-Clause
estraverse5.3.0
BSD-2-Clause
graceful-fs4.2.11
ISC
License text
jest-regex-util30.4.0
MIT
License text
jest-regex-util30.5.0
MIT
License text
jest-util30.4.1
MIT
License text
jest-util30.5.1
MIT
License text
jest-worker27.5.1
MIT
License text
jest-worker30.5.1
MIT
License text
jiti2.7.0
MIT
License text
lightningcss1.32.0
MPL-2.0
License text
mime-db1.52.0
MIT
License text
mime-db1.54.0
MIT
License text
mime-types2.1.35
MIT
License text
ms2.1.3
MIT
License text
neo-async2.6.2
MIT
License text
next15.5.25
MIT
License text
pg-cloudflare1.4.0
MIT
License text
pg-int81.0.1
ISC
License text
pg-protocol1.15.0
MIT
License text
postcss-selector-parser6.0.10
MIT
License text
react19.2.7
MIT
License text
react19.2.8
MIT
License text
react-dom19.2.7
MIT
License text
react-dom19.2.8
MIT
License text
scheduler0.27.0
MIT
License text
source-map-support0.5.21
MIT
License text
styled-jsx5.1.6
MIT
License text
tailwindcss4.3.3
MIT
License text
uncrypto0.1.3
MIT
License text
undici8.10.0
MIT
License text
undici-types5.26.5
MIT
undici-types6.21.0
MIT
License text

See our Privacy Policy and Terms of Service.

Mobile application

Bundled fonts

Dictionary data

Websites & server

More