Tendons don't like jumps. They like consistency.
TendonTally turns keyboard and mouse activity into one clear metric (KUI), so you can pace workload, avoid sudden spikes, and build steadier tolerance over time.
and want fewer overdid it days.
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KUI explained
Why KUI matters
The professional world runs on KPIs. The Key Usage Indicator (KUI) applies the same idea to your physical workload: one composite metric for keys, clicks, scroll, and cursor movement.
Screen time misses intensity. KUI captures what your hands actually did, so you can spot spikes and pace with confidence.
KUI is not perfectly accurate. It does not need to be. What matters is that it is consistent, so the trends you compare are always measured the same way.
Time does not equal strain
Screen time alone misses real workload. An hour of coding or gaming can stress your hands far more than an hour of reading or video.
One clear target
KUI combines keyboard and mouse activity into one consistent score you can track, compare, and adjust against.
Build capacity gradually
Tendons build capacity through consistent loading and small weekly increases. KUI helps you stay in that 10 to 20% progression range. Without tracking, it is easy to spike too hard and trigger relapse or forced cutbacks.
Pacing system
Break reminders based on load, not just clock time
Minutes alone miss intensity. TendonTally triggers reminders from actual keyboard and mouse usage, so low load tasks and high load sessions are treated differently.
Daily visibility
See today's load as it happens
The Today dashboard shows live activity tiles updating in real time, keys, clicks, scroll, and mouse distance, so you can spot when a session is getting heavy and adjust before the day gets away from you.
FAQ
Questions from people managing RSI while working
Why not just track screen time?+
Screen time misses intensity. Watching a video, writing code, and gaming can produce very different hand load. KUI focuses on actual input activity so your workload trend is more meaningful.
What exactly does it track?+
Key press counts, mouse click counts, scroll activity, and mouse movement distance. It never records what you type, only how much.
Where is my data stored?+
Your keyboard and mouse usage metrics stay on your Mac in the Application Support folder as local JSON files.
What is KUI?+
KUI (Key Usage Indicator) combines keyboard and mouse activity into one composite score. It is designed to be consistent, so you can compare trends over time and make better pacing decisions.
Is TendonTally free?+
Yes. TendonTally is currently free to download and use.
What macOS version do I need?+
macOS 14 (Sonoma) or later.
Start optimizing consistency with KUI
When workload is visible, pacing gets easier. Measure real keyboard and mouse load, reduce accidental spikes, and build steadier work capacity over time.