Method and sources

What we index

The Quran: Uthmani Arabic text from the Tanzil Project (tanzil.net); search runs on Tanzil’s simple text. Translations by Sahih International (English) and Muhammad Hamidullah (French), as distributed by Tanzil.

Hadith: Sahih al-Bukhari, Sahih Muslim, Sunan Abi Dawud, Jami' at-Tirmidhi, Sunan an-Nasa’i, Sunan Ibn Majah, Malik’s Muwatta and three forty-hadith books, from the hadith-api project (public domain). Grades (sahih, hasan, da’if…) are the ones the source attributes to each scholar: al-Albani, Zubair Ali Zai, Shu’ayb al-Arna’ut and others. For Bukhari and Muslim the source gives no grade: the compilers held their contents authentic.

Tafsir: al-Mukhtasar fi Tafsir al-Qur’an (Arabic, French, English) and abridged Ibn Kathir (English), from tafsir_api (MIT licence).

French hadith translations come from the source and have not been proofread. Tirmidhi has no French translation in our sources.

How the checker works

The pasted text is cleaned (emojis, links, 'please share' lines), then searched two ways: by its words, in its own language, and by its meaning, with a multilingual model that runs on our own server. Candidate narrations are then compared word by word.

'Found' means most of the words, in order, are in a narration. 'Close' means the meaning matches but the wording doesn’t, or only part of it does. 'Not found' means nothing close enough is in our collections, which does not prove a text is fabricated.

We never grade a hadith ourselves. The word 'fabricated' appears only when a scholar cited by the source graded it mawdu'.

The encyclopedia

Each entry is made of short statements, and each statement cites at least one verse, hadith or tafsir passage. The first version, the 'baseline', was drafted from those sources with help from a language model; only statements whose cited source was checked were kept.

Anyone signed in can propose an edit. It is published only once a reviewer approves it, and the reviewer’s name stays in the history. The full history is public, and the baseline can always be restored.

What this site is not

It is not a mufti. Sources, not fatwas: for a question of practice, ask a qualified scholar.