Comparison · Built-in process viewer
iKnowMyMac vs Activity Monitor
Activity Monitor is free, built in, and shows every process on your Mac. iKnowMyMac groups those processes into apps, keeps 30 days of history, and tells you why your Mac is slow.
In short
Who each app is for
Activity Monitor · Apple
Everyone with a Mac. It's already installed, it's free, and it has tools for deep inspection, such as sampling a process or running a spindump.
iKnowMyMac
People who want an answer rather than a table: why the Mac is slow, what kept it awake overnight, and which dev servers are still running.
Where Activity Monitor is better
- It's free and already on every Mac, including Intel Macs and older macOS versions.
- Per-process network traffic. iKnowMyMac only shows network totals for the whole system.
- Developer-grade inspection: sample a process, run a spindump, or collect system diagnostics for a bug report.
- The Cache tab for content caching, and per-process columns you can customise.
Where iKnowMyMac differs
- Apps instead of processes: every helper is counted under its app, so Chrome is one row with one total.
- “Why is my Mac slow?” reads the last hour and ranks the causes with evidence.
- 30 days of history you can scrub back through, not just what is happening now.
- Sleep forensics: wake reasons, dark wakes and overnight drain by app.
- Developer mode: servers by project, idle detection, port conflicts, Docker and simulators.
- A menu bar extra with four display modes and misbehaviour alerts.
Our take
Different jobs
Activity Monitor is a good tool, and you should know how to use it. Our guide to why your Mac is slow starts with it. It answers “what is running right now?” very well.
iKnowMyMac answers a different question: “why is my Mac slow, and what should I do about it?” That needs history (the slowdown is often over by the time you look), grouping (forty Chrome helpers are one app), and context (memory pressure plus swap growth, not just a big number).
Many people keep both. Activity Monitor for sampling a hung process, iKnowMyMac for the answer.
Pricing
Activity Monitor is free and included with macOS. iKnowMyMac is a one-time purchase that includes every feature and free updates, with a 14-day refund.
iKnowMyMac's 1-Mac license launches at $4.99 for the first 100, $9.99 for the next 150, $14.99 for the next 200, then $24.99. One-time purchase, every feature and free updates included, 14-day refund.
FAQ
Questions
Something else? support@iknowmymac.com
Is iKnowMyMac a replacement for Activity Monitor?
For everyday questions (what's using memory, why is it slow, what kept it awake), yes. For sampling a process or collecting a spindump, keep Activity Monitor. It's built in and good at that.
Are iKnowMyMac's numbers the same as Activity Monitor's?
They come from the same system counters. On our test Mac, iKnowMyMac's CPU, memory, disk and network figures match top, iostat, netstat and vm_stat within 0.5%. Per-app memory can differ because iKnowMyMac adds up every helper process under its app.
Why isn't iKnowMyMac on the Mac App Store?
The App Store sandbox doesn't allow reading other apps' processes, which is the whole job. iKnowMyMac is signed with a Developer ID and notarized by Apple instead.
Sources
Checked on 2026-09-27. Prices are in US dollars before local taxes. Spotted something out of date? Email support@iknowmymac.com and we'll correct it.
Know why your Mac is slow.
macOS 15 Sequoia or later · Apple silicon. A 4.2 MB native app, notarized by Apple. No account, no analytics, no telemetry.
One-time purchase · every feature · 14-day refund