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HowTall
Measure anyone's height in real time with iPhone LiDAR
Point your iPhone Pro at someone and HowTall reads their height in real time. ARKit body-pose finds head and feet, and the LiDAR scanner projects those points onto the floor plane for an accurate measurement in cm or ft/in. Fully on-device — no accounts, no analytics, no servers. Camera and depth frames are processed in memory and discarded. Free, no IAP. Requires an iPhone with LiDAR (12 Pro or later, any Pro/Pro Max). iOS 17+.
Hey Product Hunt!
I built HowTall because I kept reaching for a measuring tape and not having one. The iPhone Pro already has every sensor you need: ARKit gives 3D body keypoints, the LiDAR scanner gives a real floor plane. Combine them and you can read someone's height in about a second.
The trick I'm most proud of: don't trust the skeleton's z depth directly — it drifts with clothing and pose. Instead I cast camera rays through the head and foot pixels and intersect them with the LiDAR scene depth. That keeps the measurement floor-anchored even when the body tracking wobbles. A small temporal smoother on the readout kills jitter without adding noticeable lag.
Everything runs on-device. No accounts, no analytics, no servers. Camera + depth frames are processed in memory and discarded. App Privacy is "Data Not Collected" and you can verify in the App Store listing.
Free, no IAP. Built solo over the past few months. Requires an iPhone with LiDAR (12 Pro or later, any Pro / Pro Max), iOS 17+.
Would love feedback on accuracy edge cases — especially kids (I've only tested adults), sloped floors, and unusual stances. I'll be in the comments all day.
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About HowTall on Product Hunt
“Measure anyone's height in real time with iPhone LiDAR”
HowTall was submitted on Product Hunt and earned 6 upvotes and 1 comments, placing #85 on the daily leaderboard. Point your iPhone Pro at someone and HowTall reads their height in real time. ARKit body-pose finds head and feet, and the LiDAR scanner projects those points onto the floor plane for an accurate measurement in cm or ft/in. Fully on-device — no accounts, no analytics, no servers. Camera and depth frames are processed in memory and discarded. Free, no IAP. Requires an iPhone with LiDAR (12 Pro or later, any Pro/Pro Max). iOS 17+.
HowTall was featured in iOS (110.3k followers), Health & Fitness (82.7k followers) and Augmented Reality (44.7k followers) on Product Hunt. Together, these topics include over 64.9k products, making this a competitive space to launch in.
Who hunted HowTall?
HowTall was hunted by Shafu. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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