How HalalCook checks if a recipe is halal

By Saqib Kayani — Kayani Labs, maker of HalalCook · Published 2026-10-02

Every recipe on HalalCook — the 3,772 in the catalogue, or one you import yourself from a link, photo or screenshot — gets checked the same way: ingredient by ingredient, against a maintained rulebook, not a generic "does this look halal" guess. Here's exactly how that check works, where the rules come from, and what we're still honest about not knowing.

The five things an ingredient can come back as

Each ingredient line is matched against HalalCook's substitution rulebook and comes back as one of five statuses:

• Halal — no concern, nothing to flag.
• Haram — explicitly forbidden (pork and pork derivatives, alcohol used as an ingredient, blood, insect-derived colourants and glazes like cochineal/carmine and shellac). A swap is suggested every time.
• Mushbooh (doubtful) — genuinely unsettled or sourcing-dependent enough that we won't call it either way without more information: alcohol-based flavour extracts, alcohol-associated yeast strains, additives with an undeclared source. We say "doubtful" instead of guessing, because that's what it is.
• Permissible if sourced correctly — the ingredient itself is fine, but it has to come from a halal-slaughtered or halal-certified source to count: meat, poultry, stock, suet.
• Madhab-dependent — a small number of questions where the four schools of Islamic jurisprudence genuinely differ and there isn't one universal swap. Shellfish is the clearest example: the Maliki, Shafi'i and Hanbali view is that all sea creatures are halal, while the classical Hanafi position restricts this to scaled fish — though most contemporary Hanafi authorities now accept shrimp specifically. We show both positions rather than picking a side for you.

Where the rules actually come from

Every rule in the rulebook is written from the same three layers, in order: the Qur'an and hadith where a ruling is directly textual (pork, blood and alcohol are explicit — Qur'an 5:3 and 5:90), classical fiqh reasoning for derived questions like istihalah (complete transformation — the reason wine vinegar is halal even though wine isn't), and the published standards of halal certification bodies (IFANCA, HFA, ESMA, HMC, the OIC Fiqh Academy) for modern, industrial questions like E-numbers, dough conditioners and dealcoholised drinks that the classical texts don't address directly. Each rule in the rulebook cites its specific basis — you can see this in practice on the ruling pages linked below, each of which names its source rather than asserting a verdict unsupported.

What we don't claim — reviewed, but not yet scholar-certified as a whole

We're honest about where the rulebook currently stands. It was written editorially, cross- checked against the published positions of the certification bodies named above, and a handful of individual rules already carry a named Mufti panel certification reference. But no single qualified scholar has yet reviewed the rulebook as a whole, and we say so inside the app itself, not just here — a scholar review is something we're actively seeking, and we'll update this page and credit the reviewer publicly (with their permission) the moment that happens. Until then, treat every verdict here as a carefully-researched starting point for your own kitchen, not a personal fatwa — if you have a specific scholar or madhab you follow, their guidance takes precedence over ours.

How the match actually works, line by line

When a recipe is checked, each ingredient line is compared against every rule's list of trigger terms (whole-word matching, so "port" doesn't falsely flag "portion"). A handful of real exceptions are applied automatically rather than left for you to catch by hand: vinegar is never flagged even though it starts as wine or cider, because the alcohol has fully transformed (istihalah is real, and well-established); a "vegetarian" or "microbial" label on cheese or gelatin clears the rennet/gelatin flag, because those are the plant- or fermentation-based versions, not the animal-derived ones; a product already labelled halal, zabihah or dhabihah is treated as a sourcing confirmation rather than re-flagged; and where a recipe already offers a choice — "pancetta or beef bacon" — the halal side is selected automatically rather than flagging the whole line as a problem.

See it applied to a real ingredient

The rulebook isn't abstract — each rule has its own page working through a specific, commonly-searched ingredient in full: wine in cooking (haram, Mufti panel certified), gelatin (haram unless certified, kosher isn't the same as halal), hard cheese and rennet (mushbooh, and often less of a concern than people assume), mirin (haram as true mirin, but many bottles sold as "mirin" are a near-alcohol-free substitute) and sourdough and baking yeast (sourdough itself is halal — the mushbooh flag is a short list of specifically named yeast strains). Or skip the reading and paste a recipe into the free checker to see the same rulebook applied to your own ingredient list in seconds.

One honest caveat

HalalCook is pre-launch — there's a waitlist, not a download yet, with the app launching 25 January 2027. The free web checker is live now at halalcook.app/halal-checker and uses this exact rulebook.

Methodology described here reflects HalalCook's substitution rulebook (28 active rules) and the checker logic built on it, as of 2 October 2026 — both are maintained and can change as rules are added, corrected or reviewed. If anything here is out of date, or you're a qualified scholar interested in reviewing the rulebook, email support@halalcook.app.