Questions, feedback, or a level that grades something you think is right? Email bench [at] zebel.ai and say which app and which level. We read every message.
In each app, the first five exercises and five preview exercises from later chapters. Previews are marked open on the map from the start. A locked exercise shows what the full course includes and offers the unlock.
Every exercise in that app's course. It is a one-time purchase per app, there is no subscription, and Apple shows the current local price before you buy. Analog Bench, DSP Bench and Digital Bench are separate apps with separate purchases.
Tap any locked exercise on the map and choose Restore Purchases, signed in with the Apple Account that made the purchase. The purchase is checked with the App Store each time the app starts, so a new iPad unlocks after a restore or on first launch.
Open the result card: it lists each check with the number it measured and the number it wanted. Most failures are a part value, a wire to the wrong node, or a probe in the wrong place. If you still think the grader is wrong, email us the level number and a screenshot.
Yes, on your iPad. Progress, settings and your sandbox designs stay on the device. Deleting the app deletes them.
Only to buy or restore the unlock. Everything else runs offline.
Read the full Privacy Policy.