capa
capa: An open-source static analyzer for matching executable behavior to a ruleset. Ranked #39 of 72 in Reverse Engineering Tools by our editors (4.7/10); pricing: Free plan; best for analysts identifying executable capabilities and behaviors.
At a glance
- Editor score4.7 / 10
- PricingFree plan
- Best forAnalysts identifying executable capabilities and behaviors
- Free planYes
- Paid fromFree
- DecompilerNo
- Facts checked23 Sep 2026
Where it wins
- Matches executable and shellcode features against a ruleset
- Can analyze reports from supported sandboxes
- Shows capability matches and the supporting features
Where it doesn't
- Does not provide decompilation
- Focuses on capability identification rather than core reverse engineering
- Requires analysts to interpret rule matches and supporting evidence
Our verdict on capa
For malware analysts and reverse engineers, capa identifies what an executable or shellcode may be capable of doing. It uses a ruleset to match observed features to capabilities, then reports the matches and supporting evidence. The project is open source, runs as self-hosted software, and supports Windows, macOS, and Linux. Its role is focused: capa helps with behavioral triage, rather than providing a general environment for examining or reconstructing program code.
The standout feature is the evidence-linked capability report. Instead of only naming a behavior, capa presents the features that matched its rules, giving analysts a basis for reviewing the result. It can also analyze reports from supported sandboxes, alongside files and shellcode. That makes it useful when an investigation includes more than a directly analyzed executable, though sandbox report analysis depends on the report being supported. The ruleset approach keeps the tool centered on recognizing behaviors and capabilities.
There is no paid tier to weigh against a free plan: capa is open source. The project offers documentation and community support, so teams should be comfortable consulting those channels rather than relying on a paid support offering. Its main limitation is scope. There is no decompiler, and capability identification is not a substitute for core disassembly or decompilation work. Choose capa when matching observed features to behavioral rules is the need; look for a broader reverse engineering tool when code-level analysis is central.
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capa pricing
capa fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Decompiler | No |
| Firmware analysis | Not verified |
| Analysis mode | Static |
| Plugin API | Not verified |
| Supported platforms | Windows, macOS, Linux |
| Supported architectures | Not verified |
| Deployment | Self-hosted |
| Platforms | Windows, macOS, Linux |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 23 Sep 2026 |
Alternatives to capa
- GhidraA broad, free toolkit for native-code and bytecode reverse engineering.9.4
- IDA ProA comprehensive native reverse-engineering suite with substantial annual licensing costs.9.2
- ImHexA desktop binary inspection workbench with editing, patterns, comparison, and disassembly.8.7
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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used capa for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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