GusviHelp
Still need a hand?
Write to support@gusvi.app with the barcode or a short description, and we'll take a look.
How does a scan work?
On the Scan page, point the camera at the barcode of a packaged food. You feel a small tick when the code is read, Gusvi looks the product up in Open Food Facts, and the verdict board opens: one row per person, with the exact reason. Tap Scan next to go again. No product in front of the camera? Tap Type the barcode and enter its 8, 12 or 13 digits.
What is Who's eating?
The row of faces above the scanner. Every person in Family has a chip there: tap one to leave them out of the next checks, tap again to bring them back. At least one person stays on. Only the people switched on get a row on the verdict board.
What do Fits, Check and Avoid mean?
Avoid: something on that person's list is in the product, like "Contains milk". Check: something needs your eyes — a "may contain" warning, a word that might be on their list, or high sugar for someone keeping an eye on it. Fits: nothing on that person's list was found in the data. Fits is never a promise that a food is safe; it means the list was checked against what Gusvi knows.
What about Can't tell and No list yet?
Can't tell means none of that person's choices could be checked with the data available — say they only keep an eye on salt and the product has no nutrition data. No list yet means the person has nothing set; tap Add what to avoid to fill in their list.
How does "may contain" work?
Many labels warn that a product may contain traces of an allergen. Gusvi shows these as Check. If someone must avoid traces too, open their card in Family and turn on Also avoid "may contain" — traces then count as Avoid for that person.
Do lactose-free products show as Avoid?
Not for lactose. Turn on the lactose switch in that person's list: products labeled lactose-free still fit, and other milk products show Avoid. For a milk allergy, choose Milk under Avoid instead — then every milk product shows Avoid, lactose-free or not.
Are my photos uploaded?
No. When you photograph an ingredient list, the text is read on your phone by Apple's built-in Vision, and the photo never leaves the device. It's deleted once read, unless you turn on Keep ingredient photos in Settings to keep a small copy with the History entry. You can correct the read text before tapping Check it. Sugar, salt and processing can't be judged from a photo, so they're shown as not checked.
There's no barcode, or the product isn't found
Tap Photo of ingredients (or Photograph the ingredients on the not-found card) and take a clear picture of the list: get close, keep the label flat and use good light. If no text is found, you can type the ingredients yourself. From the not-found card you can also add the product on Open Food Facts, so the next scan finds it — for you and for everyone else.
The product data looks wrong or old
Open Food Facts is written by volunteers, so details can be missing or out of date, and recipes change. Trust the package. The Source section at the bottom of the verdict board shows when the data was last updated and links to Open Food Facts, where anyone can fix it. On a board opened from History, pull down to fetch the latest data.
What does Gusvi Pro add?
Free gives you unlimited barcode checks, one person, 3 photo reads a day and your 30 latest checks, with ads. Gusvi Pro checks up to 6 people at once, reads unlimited photos, adds watch words (words such as aspartame or carmine that you want flagged), keeps 2,000 checks with search, and removes ads. Manage or cancel it in the iPhone's Settings app; on a new device, use Restore purchases.
The camera doesn't turn on
Gusvi asks for the camera the first time you tap Turn on camera. If you said no, the scanner window shows Open Settings — tap it and allow Camera for Gusvi. Meanwhile, Type the barcode and picking a photo from your library still work.
Why can't my Android test build read text?
Reading text from a photo uses Apple's Vision, which exists only on iPhone and iPad. Android builds of Gusvi are for testing: barcode checks work, and the photo path lets you type the ingredients instead.
Is Gusvi medical advice?
No. Gusvi checks the data it has against the lists you set. It can't know everything about a product, and data can be missing. For allergies and intolerances, always read the package and follow your doctor's or allergist's advice.
How do I contact you?
Write to support@gusvi.app or use Email support in Settings. If a result looks off, tell us the barcode and what you expected to see.