zeroTremor

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  Calibration Dashboard

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  Adaptive hitboxes in real-time

About

zeroTremor is an adaptive accessibility project designed to make computer interaction easier for people with hand tremor and other motor impairments.

Imagine knowing exactly which button you want to click — but your hand physically won't stay still long enough to land on it.

For people with essential tremor, Parkinson's disease, and other conditions affecting motor control, everyday web interactions such as clicking links, filling out forms, and navigating menus can become frustrating precision tasks.

zeroTremor

Our working prototype, zeroTremor, is a standalone Chrome extension that adapts webpage interactions to the way an individual user moves.

zeroTremor begins with a short calibration exercise. As the user moves between targets, it measures pointer-path efficiency, missed clicks, and target-acquisition time to generate a personalized assistance profile.

On any webpage, zeroTremor then:

• Detects interactive elements such as buttons, links, inputs, and controls.
• Analyzes pointer trajectory, distance, direction, and approach behavior to estimate the user's intended target.
• Dynamically expands the effective hit area of likely targets based on the user's calibrated assistance profile.
• Rescues near-miss clicks when the user's intent is sufficiently clear.

The webpage itself does not need to be modified.

Synthetic Tremor Testing

To test zeroTremor under repeatable motor-control difficulty, we also built a configurable tremor simulator in Rust.

The simulator produces synthetic tremor-like pointer movement that lets us compare interaction performance under controlled conditions without representing the data as real patient or clinical data.

Synthetic Tremor Test Results

90% fewer missed targets

31% faster target acquisition

18% reduction in path-efficiency ratio

These results come from our synthetic tremor test environment and are intended as prototype validation, not clinical evidence.

How it Works

Calibration → Personalized assistance profile → Pointer trajectory + target detection → Intent prediction → Adaptive hitbox + near-miss rescue

Instead of asking someone with a motor disability to become more precise, zeroTremor makes the interface more forgiving.

Built With

• cargo
• chrome
• javascript
• rust
• storage-api
• typescript