Heftly
Heftly
Your iPhone cannot weigh anything - Heftly is honest about that. It looks at a photo and gives a smart gram estimate instead.
Coming soon to theApp StoreHeftly is a friendly gram-weight estimator for small things you can hold in your hand - and it is upfront about what it is. A phone has no scale hardware, so Heftly never pretends to measure mass. Instead, it analyzes a photo and produces a reasoned estimate.
Place a coin or a bank card next to the object - a ring, a marble, a screw - and snap one photo. The known size of the reference tells Heftly how big the object really is; from its shape and likely material it returns a range like 8 to 12 grams, with the reasoning shown so you can see exactly how it got there.
Heftly is made for curiosity: settling a guess, teaching kids about weight, sizing up a small find. It is not for cooking, jewelry valuation, or any kind of dosing - for anything that truly matters, use a real scale. Everything runs on your device, offline, with no account.
Snap the object next to a coin or card and get a gram estimate in seconds. No hardware, no gimmicks, no pressing things against the screen.
Results come as an honest range with a confidence band - like 8 to 12 grams - instead of a single made-up figure.
Heftly shows what it spotted, what it assumed about size and material, and how sure it is, so the estimate is never a black box.
A known object in frame anchors the real-world size of everything else in the photo. That is what makes the guess smart.
Analysis happens entirely on your device and photos never leave it. No account is required, and iCloud sync for your own devices stays off until you turn it on.
Star your favorite estimates and share a photo card of the result - object, range, and reference in one clean image.
Set a common coin or a standard bank card next to the thing you are curious about. Its known size calibrates the photo.
Frame both objects clearly and take the shot. Heftly detects the reference and the target on-device.
You get a gram range with a confidence band, plus the reasoning: detected size, likely material, and how sure the guess is.
No. iPhones contain no weight sensor, and no app can turn a phone into a working scale - apps that claim otherwise are pretending. Heftly is built around that honesty: it estimates weight from a photo instead of faking a measurement.
There is no app that can truly measure grams, because the hardware simply is not there. What an app can do is estimate: Heftly analyzes a photo of your object next to a known reference and reasons its way to a gram range. It is a smart guess, clearly labeled as one.
It works from size and material. A coin or card of known dimensions in the same photo tells the app the real-world scale, so it can gauge the object's volume from its outline; combining that with the likely material density yields a weight range. Heftly shows each of those reasoning steps with the result.
A photo alone has no sense of scale - a marble and a bowling ball can look identical without context. A reference object of known size anchors the true dimensions of everything in the frame. Standard coins and bank cards work well because their sizes are fixed and recognizable.
It is an estimate, not a measurement - accuracy depends on how clearly the object is framed and how predictable its material is. That is why Heftly returns a range with a confidence band rather than one precise-looking number. For solid, simple objects the range is often usefully tight; for hollow or mixed-material items it is honestly wider.
You can estimate it. Classic tricks include comparing against coins of known weight or using water displacement for volume. Heftly automates the visual version of this: one photo next to a coin, and it does the size-and-density reasoning for you, showing its work.
No. Baking and cooking need real measured grams, and a photo estimate is not that. Heftly says this plainly in the app: it is made for curiosity, and a real kitchen scale is the right tool for recipes.
Absolutely not. Dosing requires precise measurement, and no phone app can provide that. Heftly is explicitly not for medication, substances, or anything health-related - use a calibrated scale and professional guidance.
Yes. Heftly's analysis runs fully on your device, so it works with no connection at all. Your photos are processed locally and nothing leaves your phone.
No. There is no sign-up and no login. Saved estimates live on your device, and syncing to your other devices through your own iCloud is optional and off by default.
Small, solid, single-material things you can hold in your hand: rings, coins you have not identified, marbles, screws, dice, small stones. Large, hollow, or mixed-material objects make density guessing much harder, and Heftly's confidence band will honestly reflect that.
No. Screen-pressure tricks were never real weighing - modern iPhones do not even ship the pressure-sensing screens those gimmicks abused, and results were unreliable at best. Heftly takes the opposite approach: no fake measurement, just a transparent estimate from a photo.
Curious how much it weighs? Get an honest guess - and see the reasoning behind it.
Coming soon to theApp Store