Nothing to configure. A few things to check.

I feel nothing when I press play

Check that system vibration is on. When it is off, iOS silences haptic output for every app on the phone, and there is no API for an app to read the setting, so Judder cannot detect it or warn you. This is the single most common cause.

Settings › Accessibility › Touch › Vibration

Then open the Engine tab. The Hardware section reports whether Core Haptics is supported. If it reads UNSUPPORTED on a physical iPhone, haptics are unavailable to every app rather than to this one.

Nothing buzzes in the iOS Simulator

Expected. The Simulator has no Taptic Engine. Judder draws every timeline correctly there and plays the audio layer, but haptic output needs physical hardware. Use a real iPhone.

Where do my patterns go when I quit?

They save automatically to the app's own storage and are there when you come back. Deleting the app removes them, so export anything you want to keep.

How do I get a pattern into my own project?

Open a pattern, then Export. AHAP gives you a .ahap resource file to add to your bundle and load with Core Haptics. Swift gives you a paste-ready constant that rebuilds the pattern in code. Both carry a validation report showing the resolved event count, the total span, and any warning about a looping audio bed restarting mid-pattern.

A pattern sounds right but feels wrong

Haptic strength is arrangement rather than amplitude. A single event at intensity 1.0 is already the system's maximum output, so more force comes from temporal density and envelope shape instead of from a larger number. Try a burst with a shorter step before reaching for intensity.

Does Judder need an account or an internet connection?

No. It has neither. See the privacy policy.