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OCCT

All-in-one PC stress test, benchmark and monitoring tool for CPUs, GPUs, memory and power.

Free plan + paidBenchmark and stress test tools
Visit OCCTSee 2 alternatives
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About OCCT

OCCT from OCBASE is a stability and stress testing suite for PCs. It runs separate tests for the CPU, graphics card, memory and power supply (a combined load), while charting temperatures, clocks, voltages and power so you can see why a system crashes or throttles. It also has benchmarks with online leaderboards and a tuning tool built with Intel for adjusting Intel CPUs. Overclockers and system builders use it to confirm a build is stable before trusting it. OCCT Personal is free for non-commercial use on Windows and Linux; the Linux build is a single file that needs no installation. A Patreon or Steam supporter tier removes test time limits and waits and adds reports and stability certificates, and business use needs a paid Pro or Enterprise licence. It is also available on Steam. There is no macOS version.

Best for: Overclockers and PC builders who want to stress test every component in one place.

Pros and cons

What works

  • Tests CPU, GPU, memory and power supply in one app
  • Live sensor monitoring during tests
  • Free for personal use on Windows and Linux
  • No-install Linux build

Why people leave

  • Free tier limits test duration and adds waits between tests
  • Commercial use needs a paid licence
  • No macOS version

Top OCCT alternatives

See all 2
  1. 1FurMark logo
    FurMark

    Free with no time limits for GPU-only stress testing, if you don't need CPU or memory tests.

    66.5
  2. 23DMark logo
    3DMark

    Industry-standard benchmark scores and stress tests, also covering phones and Macs.

    62.6

Why people left OCCT

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

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OCCT: common questions

Is OCCT free?

OCCT has a free plan and paid plans. Free plan: Yes, OCCT Personal (checked on OCCT's own site).

Is OCCT open source?

No, OCCT is not open source.

What platforms does OCCT run on?

OCCT is available for Windows and Linux.

What are the best alternatives to OCCT?

The highest-ranked OCCT alternatives right now are FurMark and 3DMark. See the full ranked list for pricing, platforms and verified facts.

See all 2 OCCT alternatives