Caliper has a new look with a clearer caliper and easier-to-reach answers. Explore four Challenge worlds with 30 levels each, resume saved rounds, and earn achievements. Choose light or dark appearance and one of 11 in-app languages. Restore Purchases is now in Settings.

Improved Full Access purchase and restore reliability. Pending purchases are handled more accurately, and purchase issues are easier to diagnose. Existing access and progress remain available.

Improved purchase and restore handling, including recovery of existing Full Access purchases. Help is easier to read, with clearer explanations for whole-, half- and 0.02-mm readings and a more compact exercise layout. Your progress and Full Access remain available.

Choose how to begin: LEARN FIRST opens the guided caliper tutorial, while START TRAINING takes you straight to five free Level 1 exercises. In-exercise help explains the scales and you can return to the welcome screen. Full Access remains a one-time purchase.

Explore your progress across 30 levels in the new Levels screen. Replay available levels and turn vibration feedback on or off in Settings.

A new interactive introduction and guided 30-level course make the caliper easier to learn. Level 1 is free; Full Access unlocks the remaining levels and practice modes with one purchase.

Caliper Full access and minor improvements