See what your Mac is really doing.
An honest, local-only monitor that watches your Mac’s vitals — temperature, battery health, SSD wear, fans — and answers, in plain English, “what’s eating my Mac.” If one of them goes wrong, you’ll know first.
One-time $29, not a subscription · no account · we email once · verify every claim yourself ↓
Or replay a recorded Mac incident — scrub a recorded problem moment by moment
What’s eating your Mac (example)
Example readout · synthetic data · not scanning this device. CoreGuard shows your real numbers in-app.
Replay the moment something went wrong.
Three recorded examples — two genuine problems and one healthy Mac that only looks scary. Scrub the timeline and watch the numbers, the fans, and the explanation move together: observation first, interpretation second. That's how CoreGuard narrates a problem.
a post-update photo re-index · ~6 h compressed into one scrub
cpu temperature · full recording
- 09:34observedphotoanalysisd rises to ~165% CPU
- 10:10observedCPU die 65°C and climbing — it idled at 46°C
- 10:34observedfans respond: 1,500 → ~3,900 RPM
- 10:58alertCoreGuard alert: photoanalysisd has held >150% CPU for over an hour — photo-library re-indexing, common after a macOS update
- 12:10interpretedheavy but legitimate: it finishes on its own — killing it only restarts the job
- 13:34observedindexing completes — process falls back to single-digit CPU
- 14:22interpretedtemps and fans settle on their own. Nothing to fix — you just knew WHY the whole time
CoreGuard alert: photoanalysisd has held >150% CPU for over an hour — photo-library re-indexing, common after a macOS update
From the first reading you’d have known it was a photo re-index — heavy, but best left to finish (killing it only restarts the job). You’d have known what and why the whole time.
› hand-authored recordings — not live data, not captures. They mirror the kind of readings, alerts and explanations the app's views show in these situations. Scrub with ← → once the slider has focus.
The other two recordings (enable JavaScript to scrub them): Sustained video export — Final Cut holds ~700% CPU, the die sits at 96°C with fans at maximum, and that's healthy: sustained load is supposed to look like this; what matters is that it recovers, and it does. Silent SSD write storm — a sync helper writes roughly 480 GB in one afternoon with cool temps and quiet fans; only the write counters see it. CoreGuard's write-anomaly warning names the process (the warning is always free — the detailed per-app write timeline is Pro), and the wear trend keeps the bump on record.
A quiet guardian in your menu bar.
CoreGuard sits in the menu bar and watches your Mac’s vitals. While everything is normal, it stays quiet — and when a reading crosses a limit, a free alert names what changed and why. You’ll know first.
the full dashboard — every vital at a glance · all nominal, quietly
A factual alert — never a scare
SSD wear crossed 6% this month — here’s why.
It names what changed, plainly — no verdicts, no scare words. Example alert · not your Mac.
Always at a glance
A calm readout at a glance — and it turns to a free alert the moment a reading crosses a limit. Illustration.
You’d know hours earlier
It flags the write spike ~6 h before you’d hear the fans. Example timeline.
It doesn’t just show metrics. It explains them.
CoreGuard watches the raw signals, then names the cause in one plain-English sentence.
Final Cut Pro is pushing the GPU to 94°C — that’s why the fans ramped and kernel_task is throttling to protect the chip.
› observes & explains — names the process & the cause. No “clean”, no “optimize”, no verdict about your machine.
The proof bay
Key claims are verifiable on your own Mac — copy a command and run it. At launch you'll be able to run every one of these on the exact file you download: its SHA-256 will be published right beside the .dmg, so you never have to take our word for anything.
Network
0 connSignature
[ OK ]Developer-ID signed
Notarization
[ OK ]accepted
Download
SHA-256next to the download
Outbound trace · illustration
outbound connections: 0
→ Watch this page audit itself, live — the full Site Condition Report
The font arrived before the page.
You already had it.
Every word on this site is drawn with fonts already on your machine — its interface, monospaced, and serif faces. CoreGuard ships no web fonts, so the browser requests none: nothing to fetch from a type foundry, no font provider to phone home to. The constraint is the signature — the typography looks native because it already belongs to you.
Illustrative type specimens — sample text to show the three faces, not readings from your Mac.
Honest pricing — danger is always free.
Every danger & health warning is free, forever. Pro adds the power tools and portable proof — one-time $29, never a subscription, with a 30-day money-back guarantee on Pro & Family.
- Every danger & health warning
- Live temps, battery, SSD, fans
- “What’s eating your Mac”
- Menu-bar readout & threshold alerts
- Open Activity Monitor
- Everything in Free, plus
- Fan control — auto or manual
- SSD endurance & wear trend
- Per-app energy & process tools
- Exportable Condition Report
- One-time purchasepay once — no subscription, no auto-renewal
- All 1.x updates includedevery 1.x update is part of the price
- 30-day money-backfull refund on Pro & Family, no explanation required
- 3-day full trialno card, no account — free features keep working after
Family — $49 one-time, up to 6 Macs · Compare all plans →
Prices in USD · any applicable tax is shown at checkout.
Pro · one-time $29 · no subscription · every danger warning stays free.
Interactive example · not your Mac · your real numbers come from available drive health data
Straight answers
Does CoreGuard send any data off my Mac?
No. CoreGuard makes zero network connections — no account, no cloud, no telemetry. You can verify it yourself with: lsof -i -nP | grep CoreGuard
Is CoreGuard a cleaner or an antivirus?
No. CoreGuard observes and explains your Mac’s health — temperatures, battery, SSD wear, fans, and what’s using your CPU — and never cleans, optimizes, or deletes anything.
Is Pro a subscription?
No. Pro is a one-time $29 purchase, not a subscription. Every danger and health warning is free, forever.
Will I know if something goes wrong?
Yes — for the vitals it watches, that’s the point. The menu-bar readout and threshold alerts are free: when a reading crosses a limit — overheating, a worn drive, a bad battery, a full disk — CoreGuard tells you what changed and why. Danger is never paywalled.
How is CoreGuard different from free menu-bar monitors like Stats?
Free tools like Stats — and paid ones like iStat Menus — show you excellent live numbers, and they’re good at it. CoreGuard’s job is the layer above the numbers: it explains in plain English what they mean, names the process behind a spike, and alerts you the moment a reading crosses a limit. Every danger warning is free; Pro adds the power tools and a portable Condition Report you can hand to a buyer or repair shop.
a note from the developer
Most “Mac cleaners” make money the same way: invent a problem, then sell the fix — scary scans, fake “junk found,” one-click miracles for things that were never wrong.
CoreGuard is the opposite. It reads the numbers your Mac already keeps — temperatures, fans, battery, real SSD wear — and explains them in plain English. It never cleans, optimizes, or deletes anything, and it isn’t an antivirus. When something’s actually wrong you’ll see it, for free; when nothing is, it stays quiet. No account, no cloud, no telemetry — there’s nowhere for your data to go, and you don’t have to take my word for it: verify every claim yourself.
— the developeran independent developer, not a data company · more about CoreGuard →
What CoreGuard does — and never does
It observes. It explains. It never cleans, optimizes, or deletes a single file.no scare scans · read-only · no fake “junk found”
One-time $29, not a subscription · no account · one email when the .dmg is ready.