Kelvin
The everyday monitor. A clean dashboard of your CPU, GPU and memory at a glance.
- PlatformWindows 10 / 11
- Size5.2 MB
- ReadsTemps · clocks · load
- Version1.1
♥ Donate via PayPal
Hardware monitor · Windows
KELVIN_
Know exactly what your machine is doing.
Real-time CPU, GPU, RAM and sensor readings — temperatures, clocks, load, fans and power. Tiny, quiet, and honest about what it does. No account, no telemetry.
Choose your build
RetroKelvin
Runs where nothing modern will — genuine Windows XP support, in 402 KB.
- PlatformWindows XP → 11
- Size402 KB
- Needs.NET Framework 4.0
- Version1.1
RetroKelvin PRO
CPU-Z-grade identification for retro rigs — registers, SPD and chipsets, on Windows XP.
- PlatformWindows XP → 11
- Size535 KB
- ReadsSPD · MSR · PCI
- Version1.1
Kelvin PRO
The all-out diagnostics suite — find your bottleneck, benchmark RAM & disks, control fans, check drive health and log it all.
- PlatformWindows 10 / 11
- BottleneckCPU / GPU / RAM
- BenchmarksMemory · disk
- Version1.1
Free
Download Kelvin PRO— downloads
Verify this download (SHA‑256)
Check the file you downloaded really is the one published here. In PowerShell, run:
Get-FileHash .\KelvinPro-—.exe -Algorithm SHA256
It must print exactly:
—
Older versions
Every download arrives as a .zip — extract it, then right-click the app and choose Run as administrator. Kelvin is brand-new and not yet code-signed, so Windows may show a blue “Windows protected your PC” box: click More info → Run anyway. It is not a virus — here is why. Every Kelvin PRO build publishes a SHA‑256 checksum so you can verify your download yourself, and Kelvin installs no driver and asks you to switch off no Windows security feature.
RetroKelvin PRO — bare-metal identification
CPU-Z-grade hardware ID for machines the modern tools abandoned. It reads the CPU's registers, the SPD chips and the chipset directly — measured clock with live overclock, multiplier and bus, memory part numbers, chipset and GPU device IDs — on everything from Windows XP to 11, in a single 512 KB executable. Shown here in its period-correct Windows XP skin.
Free, no installer, no .NET beyond 4.0. Get RetroKelvin PRO →
Kelvin PRO goes deeper
Bottleneck detector
Play for a few minutes and Kelvin tells you whether your CPU, GPU or RAM is capping your frame rate — reading every core individually, not the misleading total, and pointing you at the fix.
Memory benchmark
Real RAM read / write bandwidth and random-access latency — compare sticks, XMP / EXPO profiles and whole systems in seconds.
Disk benchmark
Write / Read / Copy from 256 KB to 1 GB on any drive with true unbuffered speeds — and it names each SSD, so you always know which one you're testing.
System summary
One glance at your whole rig — CPU, GPU + VRAM, RAM type & speed, every drive, motherboard and monitors (with refresh rate and screen size).
Speed test
Ping, jitter & packet-loss to your router and public DNS, plus download / upload speed — the latency numbers that actually decide whether online games feel smooth.
Long time logging ALPHA
A background flight recorder: logs temps, voltages, clocks and fans to a cloud folder you own, so if a part fails you can look back and see what was drifting before it died.
…and the full toolkit
Fan control, SMART drive health, live network speed, per-metric graphs, CSV logging, power & voltage, plus system-uptime stats.
All of it free — Kelvin PRO is the deep-dive companion to the everyday Kelvin monitor. Get PRO →
What Kelvin reads
Temperatures
CPU package, GPU core & memory junction, drives, motherboard.
Clocks & load
Per-core CPU clocks, GPU core clock, utilisation and RAM usage.
Fans & power
Fan RPM, controllable channels, and live wattage draw (Pro).
Health & network
SMART drive verdicts, up/download speed, CSV logging (Pro).
Every build reads sensors directly from your hardware, so it needs to run as Administrator. No account, no background service, no data leaves your PC.
Feedback
Love it, hate it, or hit a bug? Tell us — every message, good or bad, goes straight onto the wall.
What people are saying
Loading…
Licenses & third-party notices
Kelvin, Kelvin PRO, RetroKelvin and RetroKelvin PRO are © 2026 Philip Jonas. They include open-source components that remain the property of their authors and are used under the licenses below. Each application also shows these notices in-app.
LibreHardwareMonitorLib — used by Kelvin and Kelvin PRO.
Mozilla Public License 2.0 ·
source code ·
license text
OpenHardwareMonitorLib — used by RetroKelvin and RetroKelvin PRO.
Mozilla Public License 2.0 ·
source code ·
license text
WinRing0 — kernel-mode hardware access, bundled with the libraries above.
© 2007–2009 OpenLibSys.org (Noriyuki Miyazaki) · BSD-style license ·
openlibsys.org
All of the above are redistributed in unmodified binary form. You may obtain the complete corresponding Source Code Form of any MPL-2.0 component from the source links above.