Best Debuggers in 2026
Updated
In short: LLDB is ranked #1 of 27 as of 4 October 2026, ahead of RenderDoc and FLEX. The best-ranked option with a free plan is RenderDoc. The lowest first paid tier on this page is Xdebug at £16.67/mo.
When you need to trace program behavior, debugger features and compatibility can guide your comparison. Check supported languages and target platforms, then consider whether conditional or exception breakpoints, core dump debugging, remote debugging, or time-travel debugging matter to your work. Free plans and paid-from pricing are also included. LLDB leads the ranking, with RenderDoc and GDB next; Delve and Xdebug follow among the early entries. Use the listed capabilities to compare tools against your development environment and the kinds of debugging tasks you need to handle.
27 debuggers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 LLDB iPhone + Android RecognisedPhone appDocumentedFree plan 7.9Free Supported languages: C, C++, Objective-C, Objective-C++Target platforms: macOS, iOS, tvOS, watchOS, Linux, FreeBSD, NetBSD, Windows, AndroidRemote debugging: Yes
- 2 RenderDoc Android only RecognisedPhone appDocumentedFree plan 7.8Free Supported languages: HLSL, GLSL, SPIR-VTarget platforms: Windows, Linux, Android, Nintendo SwitchRemote debugging: Yes
- 3 FLEX iPhone only RecognisedPhone appDocumentedFree plan 6.8 Supported languages: Objective-C, SwiftTarget platforms: iOS Simulator, physical iOS devicesRemote debugging: No
- 4 PonyDebugger iPhone only RecognisedPhone appDocumentedFree plan 6.7 Supported languages: Objective-C, PythonTarget platforms: iOS, macOS, web browserRemote debugging: Yes
- 5 IDA Pro No phone app RecognisedPhone appDocumentedFree plan 6.4$91.58/mo
- 6 FlowStorm No phone app RecognisedPhone appDocumentedFree plan 6.3Free Supported languages: Clojure, ClojureScriptTarget platforms: Browsers, Node.js, React NativeRemote debugging: Yes
- 7 GDB No phone app RecognisedPhone appDocumentedFree plan 6.3Free Supported languages: Ada, Assembly, C, C++, D, Fortran, Go, Objective-C, OpenCL, Modula-2, Pascal, RustTarget platforms: UNIX, Microsoft Windows, macOS; native, remote, and simulator targetsRemote debugging: Yes
- 8 Delve No phone app RecognisedPhone appDocumentedFree plan 5.8 Supported languages: GoTarget platforms: Linux, macOS, Windows, FreeBSDRemote debugging: Yes
- 9 Xdebug No phone app RecognisedPhone appDocumentedFree plan 5.7£16.67/mo Supported languages: PHPTarget platforms: Linux, macOS, Windows, web/CLI PHP environmentsRemote debugging: Yes
- 10 UDB No phone app RecognisedPhone appDocumentedFree plan 5.5 Supported languages: C, C++Target platforms: LinuxRemote debugging: Yes
- 11 CUDA-GDB No phone app RecognisedPhone appDocumentedFree plan 5.4 Supported languages: C/C++, FortranTarget platforms: Linux, QNXRemote debugging: Yes
- 12 TRACE32 No phone app RecognisedPhone appDocumentedFree plan 5.4 Supported languages: C, C++, Ada, ASMTarget platforms: Embedded systems; 150+ microprocessor architecturesRemote debugging: Yes
- 13 WinDbg No phone app RecognisedPhone appDocumentedFree plan 5.4 Supported languages: C++, C#, JavaScript, assemblyTarget platforms: Windows; Linux crash dumpsRemote debugging: Yes
- 14 dnSpyEx No phone app RecognisedPhone appDocumentedFree plan 5.3 Supported languages: C#, Visual Basic, ILTarget platforms: Windows; Linux via Wine
- 15 Ruby debug No phone app RecognisedPhone appDocumentedFree plan 5.3 Supported languages: Ruby (MRI) 2.7 and laterRemote debugging: Yes
- 16 UDE Universal Debug Engine No phone app RecognisedPhone appDocumentedFree plan 5.3 Supported languages: C, C++, Assembly, RustTarget platforms: 32-bit and 64-bit microcontrollers, multicore SoCs, embedded processors
- 17 Erlang Debugger No phone app RecognisedPhone appDocumentedFree plan 5.2 Supported languages: ErlangTarget platforms: Windows, macOS, LinuxRemote debugging: Yes
- 18 OllyDbg No phone app RecognisedPhone appDocumentedFree plan 5.2 Supported languages: assemblyTarget platforms: Microsoft Windows
- 19 OpenOCD No phone app RecognisedPhone appDocumentedFree plan 5.2 Target platforms: ARM, MIPS, RISC-V, Xtensa, ARC, AVR32, DSP563xx, DSP5680xx, eSi-RISC, STM8Remote debugging: Yes
- 20 Perl Debugger No phone app RecognisedPhone appDocumentedFree plan 5.2 Supported languages: PerlTarget platforms: Linux, macOS, Windows
- 21 x64dbg No phone app RecognisedPhone appDocumentedFree plan 5.2 Target platforms: Windows
- 22 Black Magic Debug No phone app RecognisedPhone appDocumentedFree plan 5.1 Target platforms: ARM Cortex-M, ARM Cortex-A, RISC-VRemote debugging: Yes
- 23 pyOCD No phone app RecognisedPhone appDocumentedFree plan 5.1 Target platforms: Arm Cortex-M microcontrollersRemote debugging: Yes
- 24 rr No phone app RecognisedPhone appDocumentedFree plan 5.1 Supported languages: C, C++, GoTarget platforms: Linux
- 25 SEGGER Ozone No phone app RecognisedPhone appDocumentedFree plan 5.1 Supported languages: C, C++, Rust, AssemblerTarget platforms: ARM, RISC-VRemote debugging: Yes
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which debugger is ranked first on Samsung Mobile US Press?
LLDB is ranked #1 of 27 with a score of 7.9. RenderDoc is second and FLEX third.
How many of these have a free plan?
5 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Xdebug has the lowest first paid tier we found: £16.67/mo.
How is this list ranked?
Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.