Opsino

Opsino · Adjustable measurement circle

Choose the patch you want to understand.

A narrow stripe on fabric or a larger plain surface: you choose the area Opsino analyzes.

Resize with a gesture

Swipe up or down on the circle to make it larger or smaller. Adjust it so the area contains as little as possible of any neighboring color.

Opsino’s camera guide explains measuring, the circle, flashlight, photos and optional neutral calibration.
The essential controls are also explained inside the app.

Tap to measure

Tap the circle to identify its color, or use the Measure button. Hold your iPhone still for a moment while the camera adjusts.

Optional: open neutral calibration

Press and hold the circle to open calibration. Fill the whole frame with a matte, neutral gray or white surface in the same lighting, then choose Calibrate. This step is not required for a normal reading.

Frequently asked questions

Can I measure small colored details?

You can shrink the circle. Make sure the camera can still focus on the surface and that the area does not include several colors.

How do I open calibration with VoiceOver?

The Measure button offers an additional Calibrate action for VoiceOver. This opens optional neutral calibration without a long press on the circle.

Opsino for your iPhone

Free with optional in-app purchases for Photo Mode and Resistor Mode.

Download on the App Store