Choose Activity Monitor if
- Free and already on your Mac
- Every process in detail, with sampling and system diagnostics
- Energy impact and a Dock CPU graph
OneMacTools vs Activity Monitor
Activity Monitor is apple's process and resource monitor, built into macOS. OneMacTools is one native Mac app with 138 on-device tools for video, PDFs, images, audio and files, plus Mac Clean Up, Mac Health, Dev & Agents and AI Space. Choose Activity Monitor for free and already on your Mac; choose OneMacTools if you want one row per app instead of a thousand processes: Chrome's helpers count under Chrome.
| OneMacTools | Activity Monitor | |
|---|---|---|
| What it is | Native Mac app, 138 tools | System monitor |
| Price | Free download; a licence is $19 once for 1 Mac (launch price $9), or $39, $79 or $99 for 5, 15 or 25 Macs | Free, included with macOS |
| Runs on | Mac (macOS 26 or later) | Mac |
| Your files | Processed on your Mac | On your Mac |
| Per-app CPU and memory | ✓ | ✓ |
| System stats in the menu bar | ✓ | Partly |
| Battery health | ✓ | Not listed |
| Dev servers and ports | ✓ | Not listed |
| Compress video to a target size | ✓ | — |
| Convert video formats | ✓ | — |
| Convert and compress images (incl. HEIC) | ✓ | — |
| Merge, split and compress PDFs | ✓ | — |
| Make scanned PDFs searchable (OCR) | ✓ | — |
| Redact PDFs | ✓ | — |
| Edit the text inside a PDF | — | — |
| Transcribe audio to text | ✓ | — |
| Find duplicate files | ✓ | — |
| Disk space map / storage breakdown | ✓ | — |
| Clean up junk and leftovers | ✓ | — |
| AI apps' disk use (caches, models, chats) | ✓ | — |
| AI assistants can use it (MCP) | ✓ | — |
| Works from Finder (Quick Actions) | ✓ | — |
| Shortcuts actions | ✓ | Not listed |
| Works offline, files stay on your Mac | ✓ | ✓ |
Choose OneMacTools if
- One row per app instead of a thousand processes: Chrome's helpers count under Chrome
- A line that says what's wrong, history, alerts, and what drained the battery
- Menu bar readouts, dev servers by port, AI agent sessions, and clean-up
How we compared: from Activity Monitor's own website and documentation, checked 14 October 2026. “Not listed” means we couldn't confirm it there, not that it's missing. Prices change; check theirs. Sources: support.apple.com. Something out of date? Tell us.
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