Drop a credit card in the frame. VisualRuler uses it as a reference to deliver accurate real-world measurements — no depth sensor, no LiDAR, no fuss.
Free · iPhone & iPad · iOS 18+
How it works
No calibration, no setup, no account. Just you, your phone, and any card from your wallet.
Step 01
Place any standard ID-1 card (credit card, transit card, library card) in the scene and snap a photo — or pick one from your library.
Step 02
VisualRuler automatically finds the card and locks the frame. Drag the corner handles to fine-tune if needed.
Step 03
Place line or rectangle targets anywhere in the image. Distances update in real time as you drag — in metric or imperial.
Features
Everything you need. Nothing you don't.
Card detection, frame lock, and measurement placement all happen in seconds. No spinners, no waiting.
Works with any ISO/IEC 7810 ID-1 card — credit cards, debit cards, transit passes, library cards.
Measure straight-line distances or width × height of rectangular objects with independent draggable handles.
Switch between millimetres, centimetres, inches and feet at any time. Results update instantly.
Open an existing photo and measure after the fact — no need to reshoot. Great for real estate and product photography.
Export an annotated image with all measurements overlaid, ready to share or attach to a report.
VisualRuler computes a 3×3 homography from your card's four corners to a canonical
metric rectangle (85.725 × 53.975 mm). Any two points in the image are then
projected through that matrix to yield an accurate Euclidean distance — no depth sensor, no
ARKit, no magic.
Free download. No ads. No in-app purchases to unlock the core feature.