Momo is built on Japanese-language data that other people made and chose to share. Naming them is part of the deal, and it is a deal worth keeping. The same list lives inside the app, under Settings → Credits.
No project listed here endorses Momo.
VOICEVOX:四国めたん — every word in the lessons is spoken by 四国めたん, a character voice from the VOICEVOX project.
Google Cloud Text-to-Speech — the kana are spoken by a Japanese neural voice, chosen because a single kana on its own is the hardest thing for a voice to say clearly.
JMdict — EDRDG, CC BY-SA 4.0 — English meanings come from the JMdict project of the Electronic Dictionary Research and Development Group, via jmdict-simplified. Both are shared under CC BY-SA 4.0; the Group's full terms are here.
Momo's word database keeps those meanings, so its word rows are shared under CC BY-SA 4.0 as well. That covers the word data, not the rest of the app.
KanjiVG — © Ulrich Apel, CC BY-SA 3.0 — the stroke-order diagrams come from the KanjiVG project, shared under CC BY-SA 3.0. Momo has modified them: the stroke numbers built into the drawings are hidden and redrawn in Momo's own type. The stroke artwork is otherwise unchanged, and the modified drawings are shared under the same licence.
open-anki-jlpt-decks — MIT — the JLPT vocabulary lists come from Jamie Sinclair's open-anki JLPT decks, shared under the MIT licence. Their order is also what sets the order words are taught in.
JmdictFurigana — MIT — the per-kanji furigana come from JmdictFurigana, shared under the MIT licence. Its readings are built on JMdict, so the EDRDG terms above apply to them too.
If you think something here is credited wrongly, or not credited at all, email [email protected] and we will fix it.
Last updated: 15 August 2026