The Best Debuggers in 2026
We researched debuggers through official pricing pages, plan tables, and product documentation, then ranked them on their core debugging job, value for money, and verified features. Compare language coverage, target platforms, remote workflows, breakpoint controls, and advanced execution history tools in this guide to debuggers.
Our top picks
-
Top ranked
GDB#1 of 279.4/10A free, open-source debugger with unusually broad language, target, and remote-debugging coverage.
Free plan
-
Runner-up
LLDB#2 of 279.2/10A capable, free debugger for C/C++ and Apple-platform development.
Free plan
-
Top-ranked free plan
WinDbg#3 of 279.0/10A free, deeply capable debugger for Windows applications, drivers, and crash analysis.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 27 tools, best first
-
Best forBroad native and systems debugging
A free, open-source debugger with unusually broad language, target, and remote-debugging coverage.
- Core dump debugging
- Time-travel debugging
- Exception breakpoints
9.4/10★★★★★Visit GNU Project -
Best forC/C++ and Apple-platform debugging
A capable, free debugger for C/C++ and Apple-platform development.
- Core dump debugging
- Exception breakpoints
- Remote debugging
9.2/10★★★★★Visit LLDB -
Best forWindows and kernel debugging
A free, deeply capable debugger for Windows applications, drivers, and crash analysis.
- Core dump debugging
- Time-travel debugging
- Exception breakpoints
9.0/10★★★★☆Visit Microsoft -
Best forGo developers
A deep, free Go debugger for developers who need process and runtime control.
- Core dump debugging
- Time-travel debugging
- Exception breakpoints
8.8/10★★★★☆Visit Delve -
Best forPHP web application debugging
A focused PHP debugger with remote sessions, profiling, tracing, and coverage analysis.
- Exception breakpoints
- Remote debugging
- Conditional breakpoints
8.6/10★★★★☆Visit Xdebug -
Best forProfessional reverse engineering
A deep reverse-engineering toolkit with broad architecture support, but a high annual cost.
8.5/10★★★★☆Visit Hex-Rays -
Best forCross-API graphics debugging
A focused debugger for inspecting and replaying graphics frames across major APIs.
- Time-travel debugging
- Remote debugging
8.4/10★★★★☆Visit RenderDoc -
Best forCUDA CPU/GPU debugging
A capable open-source debugger for inspecting CUDA CPU and GPU execution together.
- Core dump debugging
- Remote debugging
- Conditional breakpoints
8.3/10★★★★☆Visit NVIDIA -
Best forLarge-scale embedded debugging
A mature debugger for multicore, multi-architecture embedded development at scale.
- Core dump debugging
- Remote debugging
- Conditional breakpoints
8.2/10★★★★☆Visit Lauterbach -
Best forLinux C/C++ reverse debugging
A Linux C/C++ debugger built around recorded forward and reverse execution.
- Core dump debugging
- Time-travel debugging
- Exception breakpoints
8.0/10★★★★☆Visit Undo -
Best forEmbedded ARM and RISC-V teams
A deep standalone debugger for ARM and RISC-V teams working across code, trace, and performance.
- Exception breakpoints
- Remote debugging
- Conditional breakpoints
7.9/10★★★★☆Visit SEGGER Ozone -
Best forEnterprise embedded toolchains
An enterprise-oriented debugger for multicore embedded development, tracing, testing, and programming.
- Conditional breakpoints
7.8/10★★★★☆Visit PLS -
Best forOmniscient Clojure debugging
A free, open-source debugger with recorded execution and backward navigation for Clojure teams.
- Time-travel debugging
- Remote debugging
- Conditional breakpoints
7.7/10★★★★☆Visit FlowStorm -
Best for.NET and Unity reverse engineering
A focused, source-free debugger for .NET and Unity assemblies.
- Exception breakpoints
- Conditional breakpoints
7.6/10★★★★☆Visit dnSpyEx -
Best forRuby application debugging
A focused Ruby debugger with remote sessions, replay, tracing, and editor integrations.
- Time-travel debugging
- Exception breakpoints
- Remote debugging
7.5/10★★★★☆Visit Ruby debug -
Best forDeterministic Linux bug reproduction
A focused Linux debugger for reproducing, replaying, and reversing difficult bugs.
- Time-travel debugging
7.4/10★★★★☆Visit rr -
Best forWindows executable analysis
A capable free debugger for analyzing 32-bit and 64-bit Windows executables.
- Exception breakpoints
- Conditional breakpoints
7.3/10★★★★☆Visit x64dbg -
Best forARM Cortex-M and RISC-V hardware
An open-source GDB debugger with strong ARM Cortex-M and RISC-V coverage.
- Remote debugging
7.2/10★★★★☆Visit site -
Best forArm Cortex-M firmware teams
A capable free toolkit for Cortex-M debugging, flash programming, and automation.
- Remote debugging
7.1/10★★★★☆Visit pyOCD -
Best forJTAG-based embedded debugging
A capable free JTAG debugger for embedded targets, with language-level debugging through integrations.
- Exception breakpoints
- Remote debugging
7.0/10★★★★☆Visit OpenOCD -
Best forErlang developers
A focused Erlang debugger with graphical controls, process attachment, and remote-node support.
- Remote debugging
- Conditional breakpoints
6.9/10★★★☆☆Try Erlang Debugger -
Best forPerl developers
A free, open-source debugger for local Perl development across three operating systems.
- Conditional breakpoints
6.8/10★★★☆☆Visit Perl -
Best foriOS network and UI inspection
A focused, free toolkit for inspecting iOS networks, interfaces, data, and logs.
- Remote debugging
6.6/10★★★☆☆Visit PonyDebugger -
Best foriOS runtime inspection
A free, open-source toolkit for inspecting and modifying iOS apps at runtime.
6.5/10★★★☆☆Visit FLEX -
Best forFree Windows binary analysis
Free binary debugging for Windows when source code is unavailable.
- Conditional breakpoints
6.4/10★★★☆☆Visit OllyDbg -
Best forPython unit-test development
A mature, free Python testing framework with strong core test-building tools.
6.2/10★★★☆☆Visit unittest -
Best forSelf-hosted reverse proxying
A capable self-hosted reverse proxy for dynamic routing, TLS, and WebSockets.
6.0/10★★★☆☆Visit Redbird
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Supported languages | Target platforms | Remote debugging | Score |
|---|---|---|---|---|---|---|---|
| 1 | GDB | Yes | Free | Ada, Assembly, C, C++, D, Fortran, Go, Objective-C, OpenCL, Modula-2, Pascal, Rust | UNIX, Microsoft Windows, macOS; native, remote, and simulator targets | Yes | 9.4 |
| 2 | LLDB | Yes | Free | C, C++, Objective-C, Objective-C++ | macOS, iOS, tvOS, watchOS, Linux, FreeBSD, NetBSD, Windows, Android | Yes | 9.2 |
| 3 | WinDbg | Yes | Free | C++, C#, JavaScript, assembly | Windows; Linux crash dumps | Yes | 9.0 |
| 4 | Delve | Yes | Free | Go | Linux, macOS, Windows, FreeBSD | Yes | 8.8 |
| 5 | Xdebug | Yes | £200/user/yr | PHP | Linux, macOS, Windows, web/CLI PHP environments | Yes | 8.6 |
| 6 | IDA Pro | No | $1,099/yr | 8.5 | |||
| 7 | RenderDoc | Yes | Free | HLSL, GLSL, SPIR-V | Windows, Linux, Android, Nintendo Switch | Yes | 8.4 |
| 8 | CUDA-GDB | Free | C/C++, Fortran | Linux, QNX | Yes | 8.3 | |
| 9 | TRACE32 | C, C++, Ada, ASM | Embedded systems; 150+ microprocessor architectures | Yes | 8.2 | ||
| 10 | UDB | No | C, C++ | Linux | Yes | 8.0 | |
| 11 | SEGGER Ozone | No | C, C++, Rust, Assembler | ARM, RISC-V | Yes | 7.9 | |
| 12 | UDE Universal Debug Engine | C, C++, Assembly, Rust | 32-bit and 64-bit microcontrollers, multicore SoCs, embedded processors | 7.8 | |||
| 13 | FlowStorm | Yes | Free | Clojure, ClojureScript | Browsers, Node.js, React Native | Yes | 7.7 |
| 14 | dnSpyEx | Yes | Free | C#, Visual Basic, IL | Windows; Linux via Wine | 7.6 | |
| 15 | Ruby debug | Free | Ruby (MRI) 2.7 and later | Yes | 7.5 | ||
| 16 | rr | Free | C, C++, Go | Linux | 7.4 | ||
| 17 | x64dbg | Yes | Free | Windows | 7.3 | ||
| 18 | Black Magic Debug | Yes | Free | ARM Cortex-M, ARM Cortex-A, RISC-V | Yes | 7.2 | |
| 19 | pyOCD | Yes | Free | Arm Cortex-M microcontrollers | Yes | 7.1 | |
| 20 | OpenOCD | Yes | Free | ARM, MIPS, RISC-V, Xtensa, ARC, AVR32, DSP563xx, DSP5680xx, eSi-RISC, STM8 | Yes | 7.0 | |
| 21 | Erlang Debugger | Free | Erlang | Windows, macOS, Linux | Yes | 6.9 | |
| 22 | Perl Debugger | Yes | Free | Perl | Linux, macOS, Windows | 6.8 | |
| 23 | PonyDebugger | Yes | Free | Objective-C, Python | iOS, macOS, web browser | Yes | 6.6 |
| 24 | FLEX | Yes | Free | Objective-C, Swift | iOS Simulator, physical iOS devices | No | 6.5 |
| 25 | OllyDbg | Yes | Free | assembly | Microsoft Windows | 6.4 | |
| 26 | unittest | Yes | Free | Python | 6.2 | ||
| 27 | Redbird | Yes | Free | 6.0 |
Head-to-head All 28 comparisons →
- GDB vs LLDB
- GDB vs WinDbg
- GDB vs Delve
- GDB vs Xdebug
- GDB vs IDA Pro
- GDB vs RenderDoc
- GDB vs CUDA-GDB
- LLDB vs WinDbg
- LLDB vs Delve
Explore other topics All topics →
- AI Tools 303 directories · 8,269 tools ranked AI Writing Tools · AI Video Generators · Text-to-Speech Software
- Web Hosting & Domains 275 directories · 6,107 tools ranked Shared Web Hosting · Managed Cloud Hosting · Dedicated Server Hosting
- Productivity 157 directories · 4,948 tools ranked Note-Taking Apps · Calendar Apps · Project Management Software
- Marketing 135 directories · 3,978 tools ranked SEO Tools · Influencer Marketing Platforms · Email Marketing Software
- Sales & CRM 152 directories · 4,161 tools ranked Real Estate CRM Software · CRM Software · Proposal Software
- Customer Service 55 directories · 1,547 tools ranked Chatbot Builders · Knowledge Base Software · Call Center Software
How we rank debuggers
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update