ClawHammer
ClawHammer: A free Windows tool for CPU and memory stress runs with sensor monitoring and CSV logs. Ranked #12 of 32 in PC Stress Testing Tools by our editors (7.5/10); pricing: Free plan; best for windows CPU and memory testing with telemetry.
At a glance
- Editor score7.5 / 10
- PricingFree plan
- Best forWindows CPU and memory testing with telemetry
- Free planYes
- Paid fromNone
- CPU stress testingYes
- Facts checked5 Oct 2026
Where it wins
- Offers built-in CPU and memory workloads, including AVX and bandwidth tests
- Can stop runs at temperature or throttling thresholds
- Logs telemetry to CSV and plots temperatures
Where it doesn't
- Windows-only, with no GPU stress testing
- Requires Windows 10/11 and the .NET 10 Desktop Runtime
- Plugin catalog and hardware readings add setup choices to a focused tool
Our verdict on ClawHammer
ClawHammer is a free Windows desktop application for stressing a PC's CPU and memory. Its built-in workloads cover floating-point, integer, AVX, mixed, blend, integer-heavy, and memory-bandwidth tests, while a plugin manager and online catalog allow additional workloads. It is aimed at solo users who want workload variety and visibility into system behavior during a test, rather than a broader PC diagnostic suite.
Monitoring and control are central to the tool. ClawHammer reads hardware temperatures, clocks, voltages, and throttling, and can automatically stop a run when temperature or throttling thresholds are reached. Users can schedule timed runs and set core affinity. CSV telemetry logging and temperature plotting help preserve and review run data. The validation monitor reports per-thread status and checks CPU and memory workload results. LibreHardwareMonitor is the listed integration for sensor readings.
The tradeoff is its narrow scope: the published workloads focus on CPU and memory, not GPU stress testing, so it is not a fit for validating graphics cards or a complete system-testing workflow. The public repository specifies Windows 10/11 and requires the .NET 10 Desktop Runtime, which makes platform and runtime compatibility worth checking before installation. ClawHammer suits Windows users seeking free, configurable CPU and memory testing with telemetry and threshold-based stopping; users needing GPU coverage or support beyond Windows should choose another tool.
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ClawHammer pricing
ClawHammer fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| CPU stress testing | Yes |
| GPU stress testing | No |
| Memory stress testing | Yes |
| Combined system workload | Yes |
| Error detection | Yes |
| Platform support | Windows |
| Deployment | Desktop |
| Platforms | Windows |
| Built for | Solo (editorial estimate) |
| Integrations | 1 integrations: LibreHardwareMonitor |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 5 Oct 2026 |
ClawHammer integrations
ClawHammer lists 1 integrations on its own site.
- LibreHardwareMonitor
Alternatives to ClawHammer
- OCCTBroad component testing for PC stability, with free personal use and paid reporting options.8.9
- BurnInTestBroad component testing with bootable runs and exportable reports, sold by one-time license.8.9
- AIDA64AIDA64 pairs PC stress testing with detailed sensor monitoring and business network tools.8.7
See all ClawHammer alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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