Add temp-check extension by ADCAdams · Pull Request #25555 · raycast/extensions

ADCAdams · 2026-02-18T03:23:14Z

Description

Temp Check gives you instant access to your Mac's CPU temperature — right from the menu bar or a detailed Raycast command.

Why this extension?

There's no built-in way to check CPU temperature on macOS without third-party apps. Existing solutions are either paid, bloated, or require granting elevated permissions. Temp Check seamlessly reads thermal sensors directly via macOS IOKit APIs. This means no sudo, no background daemons, no kernel extensions, and no pop-ups!

Features

Menu Bar Display — Live CPU temperature with color-coded severity indicator (green/yellow/orange/red)
Detailed View — Full breakdown of all thermal die sensors, chip model, CPU core count, and temperature status
Celsius / Fahrenheit Toggle — Switch units instantly with Cmd+U in the list view, or from the menu bar dropdown. Preference persists across sessions via LocalStorage.
Configurable Thresholds — Set custom warning (default 80°C) and critical (default 95°C) temperature thresholds in extension preferences
Apple Silicon Aware — Detects chip model (M1/M2/M3/M4 etc.), reports correct core count, and explains that GPU shares the die on unified architecture chips

How it works

The extension compiles a lightweight Objective-C binary from source (tools/temp-reader.m) during the build step — no opaque binaries are bundled. The binary uses IOKit HID thermal APIs to read all available temperature sensors. It's compiled as a universal binary (arm64 + x86_64) so it runs natively on both Apple Silicon and Intel Macs.

A note on "Die Sensors" vs CPU cores

macOS exposes thermal die sensors (e.g. PMU tdie1), not per-core temperature readings. The number of die sensors does not match the number of CPU cores — for example, an M4 Max has 14 cores but 10 die sensors. The extension clearly labels these as "Die Sensor 1", "Die Sensor 2", etc. and shows the actual core count separately so users understand what they're seeing.

Screencast

Checklist

I read the extension guidelines
I read the documentation about publishing
I ran npm run build and tested this distribution build in Raycast
I checked that files in the assets folder are used by the extension itself
I checked that assets used by the README are placed outside of the metadata folder

- Add temp-check/ to gitignore - Fix Prettier formatting - Add README with feature docs and sensor explanation - Add Temp Check Raycast extension - Initial commit

raycastbot · 2026-02-18T03:23:29Z

Congratulations on your new Raycast extension! 🚀

We're currently experiencing a high volume of incoming requests. As a result, the initial review may take up to 10-15 business days.

Once the PR is approved and merged, the extension will be available on our Store.

greptile-apps · 2026-02-18T03:56:32Z

Greptile Summary

New extension that monitors Mac CPU temperature via IOKit thermal sensors, with a menu bar display and a detailed list view. The extension compiles a lightweight Objective-C binary from source during build to read thermal data without elevated permissions.

The Objective-C binary (tools/temp-reader.m) is missing an extern declaration for IOHIDEventSystemClientCopyServices, which relies on implicit function declaration. On 64-bit systems with modern Clang (Apple Clang 15+), this will either fail to compile or produce incorrect behavior by truncating the returned pointer.
.prettierrc uses printWidth: 100 instead of the required 120.
CHANGELOG.md uses a hardcoded date instead of the {PR_MERGE_DATE} placeholder.
Preferences interface is manually defined in src/lib/types.ts; preference types are auto-generated in raycast-env.d.ts and should not be duplicated.
Extension is missing the required metadata/ folder with Raycast-styled screenshots for the store listing.

Confidence Score: 2/5

This PR needs fixes before merging — the missing extern declaration in the native binary is a potential compilation/runtime issue, and several repository conventions are not followed.
Score of 2 reflects a potential compilation issue in the Objective-C binary (missing extern for IOHIDEventSystemClientCopyServices), missing metadata folder for store screenshots, non-standard prettierrc, hardcoded changelog date, and manually defined Preferences type. The TypeScript code itself is well-structured.
extensions/temp-check/tools/temp-reader.m (missing extern declaration), extensions/temp-check/.prettierrc (wrong printWidth), extensions/temp-check/CHANGELOG.md (hardcoded date), extensions/temp-check/src/lib/types.ts (manual Preferences interface)

Important Files Changed

Filename	Overview
extensions/temp-check/package.json	Well-structured package.json with proper commands, preferences, and build scripts. Category "System" is appropriate.
extensions/temp-check/.prettierrc	Uses printWidth 100 instead of the required 120 per repository standards.
extensions/temp-check/CHANGELOG.md	Uses hardcoded date instead of {PR_MERGE_DATE} placeholder as required by repository conventions.
extensions/temp-check/src/lib/types.ts	Manually defines a Preferences interface that should be auto-generated from raycast-env.d.ts.
extensions/temp-check/src/lib/temperature.ts	Clean temperature reading logic using execFile with timeout. Good error handling with fallback values.
extensions/temp-check/src/temperature-monitor.tsx	Detailed list view for temperature monitoring with sensor breakdown. Well-structured component.
extensions/temp-check/src/menubar-temperature.tsx	Menu bar command with color-coded temperature display. Properly structured with all expected sections.
extensions/temp-check/tools/temp-reader.m	Objective-C binary for reading IOKit thermal sensors. Missing extern declaration for IOHIDEventSystemClientCopyServices which relies on implicit function declaration — a potential issue on strict compilers. Minor memory leak of IOHIDEventRef objects (cosmetic for short-lived process).

_{Last reviewed commit: b43537d}

greptile-apps

_{19 files reviewed, 4 comments}

_{Edit Code Review Agent Settings | Greptile}

greptile-apps · 2026-02-18T03:56:36Z

extensions/temp-check/.prettierrc

@@ -0,0 +1,4 @@
+{
+  "printWidth": 100,


Non-standard printWidth value

All extensions in this repository must use printWidth: 120 per the standard Raycast Prettier configuration. This is set to 100.

Suggested change

"printWidth": 100,

"printWidth": 120,

Context Used: Rule from dashboard - What: All extensions must use the standard Raycast Prettier configuration with printWidth: 120 and... (source)

greptile-apps · 2026-02-18T03:56:37Z

extensions/temp-check/CHANGELOG.md

@@ -0,0 +1,10 @@
+# Temp Check Changelog
+
+## [Initial Version] - 2026-02-17


Use {PR_MERGE_DATE} placeholder

Changelog entries for new PRs must use the {PR_MERGE_DATE} placeholder instead of a hardcoded date. The actual merge date is set automatically during release.

Suggested change

## [Initial Version] - 2026-02-17

## [Initial Version] - {PR_MERGE_DATE}

Context Used: Rule from dashboard - What: Changelog entries must use {PR_MERGE_DATE} placeholder in titles, be placed at the top of th... (source)

greptile-apps · 2026-02-18T03:56:38Z

extensions/temp-check/src/lib/types.ts

+export interface Preferences {
+  temperatureUnit: "celsius" | "fahrenheit";
+  refreshInterval: string;
+  warningThreshold: string;
+  criticalThreshold: string;
+}


Remove manual Preferences interface

Preference types are auto-generated in raycast-env.d.ts when the extension builds. Manually defining a Preferences interface is redundant and can drift out of sync with package.json. Remove this interface and use Preferences from the auto-generated types directly (it's globally available).

All call sites (temperature-monitor.tsx, menubar-temperature.tsx, useTemperatureUnit.ts) should update their imports to stop importing Preferences from this file.

Context Used: Rule from dashboard - What: Don't manually define Preferences for getPreferenceValues() or commends Argument interfa... (source)

_{Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!}

greptile-apps · 2026-02-18T03:56:39Z

extensions/temp-check/tools/temp-reader.m

+extern IOHIDEventSystemClientRef IOHIDEventSystemClientCreate(CFAllocatorRef allocator);
+extern int IOHIDEventSystemClientSetMatching(IOHIDEventSystemClientRef client, CFDictionaryRef match);
+extern IOHIDEventRef IOHIDServiceClientCopyEvent(IOHIDServiceClientRef, int64_t, int32_t, int64_t);
+extern CFStringRef IOHIDServiceClientCopyProperty(IOHIDServiceClientRef service, CFStringRef property);
+extern double IOHIDEventGetFloatValue(IOHIDEventRef event, int32_t field);


Missing extern declaration for IOHIDEventSystemClientCopyServices

All other private IOKit functions (IOHIDEventSystemClientCreate, IOHIDServiceClientCopyEvent, etc.) have explicit extern declarations, but IOHIDEventSystemClientCopyServices (used on line 23) does not. This relies on implicit function declaration, which assumes the function returns int. On 64-bit systems, this truncates the returned pointer value and can cause a crash. Modern Clang versions (Apple Clang 15+) treat implicit function declarations as errors by default.

Add the missing declaration alongside the others:

Suggested change

extern IOHIDEventSystemClientRef IOHIDEventSystemClientCreate(CFAllocatorRef allocator);

extern int IOHIDEventSystemClientSetMatching(IOHIDEventSystemClientRef client, CFDictionaryRef match);

extern IOHIDEventRef IOHIDServiceClientCopyEvent(IOHIDServiceClientRef, int64_t, int32_t, int64_t);

extern CFStringRef IOHIDServiceClientCopyProperty(IOHIDServiceClientRef service, CFStringRef property);

extern double IOHIDEventGetFloatValue(IOHIDEventRef event, int32_t field);

extern IOHIDEventSystemClientRef IOHIDEventSystemClientCreate(CFAllocatorRef allocator);

extern int IOHIDEventSystemClientSetMatching(IOHIDEventSystemClientRef client, CFDictionaryRef match);

extern CFArrayRef IOHIDEventSystemClientCopyServices(IOHIDEventSystemClientRef client);

extern IOHIDEventRef IOHIDServiceClientCopyEvent(IOHIDServiceClientRef, int64_t, int32_t, int64_t);

extern CFStringRef IOHIDServiceClientCopyProperty(IOHIDServiceClientRef service, CFStringRef property);

0xdhrv · 2026-02-18T06:01:05Z

Thanks for your contribution 🔥

We already have an extension in the Store that deals with system monitoring. Could we consider enhancing the existing extension below instead of creating another one?

https://www.raycast.com/hossammourad/raycast-system-monitor by @hossammourad

I think you can enhance the existing extension to add the temp-check feature

If there are unique features or workflows you’re aiming to add, we’d love to hear them and see if they can be integrated into this to avoid duplication and improve discoverability.

This would help avoid duplication and keep related functionality consolidated in one place.
As mentioned in our extension guidelines here ↗

ADCAdams · 2026-02-18T12:34:46Z

Thanks for the feedback @0xdhrv — that makes sense. Happy to contribute CPU temperature monitoring to the existing System Monitor extension instead.

The core value-add here is reading thermal sensor data via IOKit HID APIs through a lightweight Objective-C binary compiled from source (no sudo, no kernel extensions, no native node addons). This gives:

CPU die temperature — average, max, and per-sensor breakdown
Chip-aware context — detects Apple Silicon model, core count, and number of die sensors
Severity indicators — color-coded normal/warm/hot/critical thresholds
Celsius/Fahrenheit toggle

System Monitor currently only has battery temperature. I'll open a PR on the System Monitor extension adding a Temperature section to both the list view and menu bar command.

I'll close this PR once that's up.

Add temp-check extension

b43537d

- Add temp-check/ to gitignore - Fix Prettier formatting - Add README with feature docs and sensor explanation - Add Temp Check Raycast extension - Initial commit

raycastbot added the new extension Label for PRs with new extensions label Feb 18, 2026

ADCAdams marked this pull request as ready for review February 18, 2026 03:44

greptile-apps bot reviewed Feb 18, 2026

View reviewed changes

0xdhrv self-assigned this Feb 18, 2026

0xdhrv marked this pull request as draft February 18, 2026 06:01

ADCAdams mentioned this pull request Feb 18, 2026

System Monitor: Add CPU temperature monitoring #25577

Merged

5 tasks

ADCAdams closed this Feb 26, 2026

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Add temp-check extension#25555

Add temp-check extension#25555
ADCAdams wants to merge 1 commit intoraycast:mainfrom
ADCAdams:ext/temp-check

ADCAdams commented Feb 18, 2026 •

edited

Loading

Uh oh!

raycastbot commented Feb 18, 2026

Uh oh!

greptile-apps bot commented Feb 18, 2026

Uh oh!

greptile-apps bot left a comment

Uh oh!

greptile-apps bot Feb 18, 2026

Uh oh!

greptile-apps bot Feb 18, 2026

Uh oh!

greptile-apps bot Feb 18, 2026

Uh oh!

greptile-apps bot Feb 18, 2026

Uh oh!

0xdhrv commented Feb 18, 2026

Uh oh!

ADCAdams commented Feb 18, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

		@@ -0,0 +1,10 @@
		# Temp Check Changelog

		## [Initial Version] - 2026-02-17

	## [Initial Version] - 2026-02-17
	## [Initial Version] - {PR_MERGE_DATE}

Conversation

ADCAdams commented Feb 18, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Description

Why this extension?

Features

How it works

A note on "Die Sensors" vs CPU cores

Screencast

Checklist

Uh oh!

raycastbot commented Feb 18, 2026

Uh oh!

greptile-apps bot commented Feb 18, 2026

Greptile Summary

Confidence Score: 2/5

Important Files Changed

Uh oh!

greptile-apps bot left a comment

Choose a reason for hiding this comment

Uh oh!

greptile-apps bot Feb 18, 2026

Choose a reason for hiding this comment

Uh oh!

greptile-apps bot Feb 18, 2026

Choose a reason for hiding this comment

Uh oh!

greptile-apps bot Feb 18, 2026

Choose a reason for hiding this comment

Uh oh!

greptile-apps bot Feb 18, 2026

Choose a reason for hiding this comment

Uh oh!

0xdhrv commented Feb 18, 2026

Uh oh!

ADCAdams commented Feb 18, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

ADCAdams commented Feb 18, 2026 •

edited

Loading