Idle Time Detection
Idle time detection is a time tracking feature that detects when a user's keyboard and mouse have been inactive for a set period and prompts them to either discard the idle time, reassign it, or confirm it as legitimate (e.g., time spent thinking or on a phone call). It prevents accidental over-billing from forgotten running timers.
How idle time detection works
Most desktop time tracking apps monitor keyboard and mouse activity. When activity stops for a configurable threshold (typically 2–10 minutes), the tool detects the idle period.
At the end of an idle period, the tool typically presents a dialogue:
- Keep the idle time — the user was thinking, on a call, or doing offline work. Timer continues as-is.
- Discard the idle time — the user was away from the desk. The timer rewinds to the last active moment.
- Assign to a different project — the idle time represents work on another task.
The purpose is billing accuracy, not surveillance. A forgotten running timer that accumulates 2 hours while the user was at lunch is the problem idle detection solves.
Idle detection vs activity monitoring
These are different features that are often conflated:
Idle detection: alerts when there’s been no input for X minutes. This is a billing accuracy tool. Standard in Toggl Track, Harvest, and Clockify.
Activity monitoring: records screenshots at intervals, tracks which apps are in use, calculates an “activity score” based on keyboard/mouse events per minute. This is a surveillance tool. Present in Hubstaff, Time Doctor, and Teramind.
Toggl Track has idle detection with no activity monitoring. Hubstaff has both. The distinction matters significantly for how your team will perceive and adopt the tool.
Configuring idle detection properly
Most tools let you set:
- Idle threshold: how long before idle is triggered (2 minutes is the default in Toggl; 5 minutes in Harvest)
- Detection method: keyboard + mouse activity only, or also app focus
- Alert timing: at the end of the idle period, or immediately when idle is detected
For a creative or knowledge-work team: set the idle threshold to 5–10 minutes. 2 minutes is too aggressive for roles that involve reading, thinking, or video calls (which generate no keyboard/mouse activity).
Which tools have idle detection
| Tool | Idle detection | Activity screenshots | Activity score |
|---|---|---|---|
| Toggl Track | Yes | No | No |
| Harvest | Yes | No | No |
| Clockify | Yes (paid plans) | No | No |
| Hubstaff | Yes | Yes (optional) | Yes |
| Time Doctor | Yes | Yes | Yes |
| Timely | N/A (automatic tracking) | No | No |
| RescueTime | App-based (passive) | No | Productivity score |
The legal consideration for UK/EU teams
UK law (Data Protection Act 2018, UK GDPR) requires employee monitoring to be:
- Proportionate to the business purpose
- Disclosed to employees in writing (employment contract or monitoring policy)
- Limited to what’s necessary
Implementing screenshot monitoring without disclosure is a legal risk in the UK and EU. Implementing it with disclosure and a clear business rationale (government contracts requiring audit evidence, legal billing compliance) is legally defensible.
Idle detection (no screenshots, no activity scoring) is generally not considered “monitoring” in the UK GDPR sense — it’s a billing accuracy mechanism. Screenshot capture and activity scoring do fall under monitoring disclosure requirements.