Best Debuggers in 2026
Updated
In short: LLDB is ranked #1 of 27 as of 4 October 2026, ahead of GDB and FlowStorm. The best-ranked option with a free plan is GDB. The lowest first paid tier on this page is Xdebug at £16.67/mo.
Debuggers help you inspect program execution and investigate unexpected behavior. Compare supported languages and target platforms, then consider whether conditional or exception breakpoints, remote debugging, and core dump debugging fit the problems you need to examine. Time-travel debugging is another capability to weigh, while free-plan availability and paid-from pricing provide cost context. LLDB, GDB, and FlowStorm are among the options to consider, alongside IDA Pro and RenderDoc. The right comparisons depend on your development environment and debugging workflow, so use the listed features to focus on tools suited to the languages, targets, and issues you work with.
27 debuggers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Debuggers, ranked on how quickly a newcomer can get going. 7 of the 25 on this page can be tried for free.
- 1 LLDBFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 2 GDBFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 3 FlowStormFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 4 IDA ProPaid from $91.58/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 5 RenderDocFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 6 UDB
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 7 XdebugPaid from £16.67/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 8 Delve
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 9 SEGGER Ozone
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 10 TRACE32
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 11 CUDA-GDB
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 12 dnSpyExFree plan
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 13 Erlang Debugger
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 14 OpenOCD
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 15 Perl Debugger
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 16 PonyDebugger
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 17 WinDbg
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 18 Black Magic Debug
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 19 FLEX
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 20 pyOCD
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 21 UDE Universal Debug Engine
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 22 OllyDbg
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 23 Ruby debug
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 x64dbg
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 rr
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
Is your platform 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 The Geeks Club?
LLDB is ranked #1 of 27 with a score of 7.3. GDB is second and FlowStorm third.
How many of these have a free plan?
6 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 on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.