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B2R2 review

Free#23 of 72 in Reverse Engineering Tools

A multi-architecture toolkit for building static binary-analysis workflows, not a source decompiler.

6.4/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

B2R2 is an open-source static binary-analysis framework written in F#, aimed at security researchers, reverse engineers, and developers building custom analysis tools. It combines binary loading and parsing with machine-code disassembly and instruction lifting to an intermediate representation. The published architecture list spans x86 and x86-64, ARM32 and ARM64, MIPS32 and MIPS64, PowerPC32 and PowerPC64, RISC-V, AVR, SuperH4, and EVM. It runs on Windows, macOS, and Linux. Its broad scope suits people who want a framework to build on rather than a turnkey source decompiler.

The analysis pipeline is the main draw: B2R2 can construct control-flow graphs and perform data-flow and semantic analyses, with command-line utilities for analysis tasks. Its .NET/F# libraries and public framework APIs give developers a way to extend workflows and tailor analysis to their own tools. That flexibility comes with a development-oriented profile: the project is self-hosted, and using its libraries means working within the .NET/F# ecosystem. Choose B2R2 when extensibility and architecture coverage matter more than a ready-made decompilation interface.

B2R2 is distributed as open-source software, so there is no paid plan tier to compare; prospective users can evaluate the project without a subscription. The trade-off is that it is primarily a static-analysis framework and does not provide source-level decompilation. Support is through community channels and documentation. Researchers or engineering teams comfortable assembling their own analysis workflow may find its combination of disassembly, IR lifting, and graph and data-flow analysis a fit. Those who need a source-oriented decompiler or vendor support should look elsewhere.

B2R2 pros and cons

  • Where it wins
    • Loads and parses binaries, disassembles code, and lifts instructions to an IR
    • Supports CFG construction plus data-flow and semantic analysis
    • Provides command-line utilities and extensible .NET/F# libraries
  • Where it doesn't
    • Does not provide source-level decompilation
    • Requires self-hosted setup and .NET/F# development
    • Support is limited to community channels and documentation

B2R2 fact sheet, pricing and score →

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