Every gluten scanner can read a barcode. The hard part is that a US label is required to declare wheat and is not required to declare barley or rye hiding inside a natural flavour. If you can't see the reasoning, you are trusting someone else's guess.
Works in the browser today. iOS and Android apps are in progress, and the web scanner is the same engine.

Barcode reading happens on the device itself, so the camera frame never leaves your phone. If the product is not in any database, photograph the ingredient panel instead and CiCi reads the printed text.
You get the text on the label that produced the answer, marked up in place, with the rule and the regulation next to it. If the reasoning is wrong, you can see it.
"Can't verify" is a real answer here. On a US label, barley inside a natural flavour need not be declared, so on a package with no gluten-free claim there are questions that honestly cannot be closed. Every other scanner shows a green tick anyway.
Ingredient statement, allergen declaration and nutrition panel, imported from Open Food Facts and USDA FoodData Central and assessed by the same rules you can watch work on this site. It means most scans return an answer immediately instead of waiting on somebody else's API. A barcode that is not in there still gets looked up live, or read off a photograph of the panel.
No monthly cap. Fig, Spoonful and Sift each cut you off at five scans a month, and one 2025 entrant limits you to one scan a day. Five scans does not cover one grocery trip.
For the products no database has ever heard of. Photograph the ingredient panel and CiCi reads it the same way, with the same reasoning and the same citations.
Total and net carbohydrate with the arithmetic printed rather than hidden. Around 6% of people with type 1 diabetes also have coeliac disease, roughly six times the background rate. No other app in this category answers both questions in one place. CiCi shows the numbers and never calculates a dose.
Every rule that fired, the label text that triggered it, and the regulation behind it.
Record a reaction and CiCi looks back across everything you scanned before it, then across your other reactions, to find what they have in common. It shows you the pattern. It never tells you what caused it.
Your regular shop in one place, so the weekly trip is not a re-scan of the same forty items.
These are built or not built, never “coming soon” in a price list. You are not paying for anything below until it appears in the list above.