This page's audience our own tag's counts — open to see them

Period

–Visits

–Page views

–Clicks to vendors

–Time on page

–Reading now

Clicks to vendors, by tool

Top countries

Devices

– · visits, page views and clicks counted by our own tag, which counts more than our checked analytics; every figure rounded down · how we count

OllyDbg

Free#25 of 27 in Debuggers

OllyDbg: Free binary debugging for Windows when source code is unavailable. Ranked #25 of 27 in Debuggers by our editors (6.4/10); pricing: Free plan; best for free Windows binary analysis.

6.4/10Editor score

Visit OllyDbg

OllyDbg6.4 Visit OllyDbg

At a glance

Editor score
6.4 / 10
Pricing
Free plan
Best for
Free Windows binary analysis
Free plan
Yes
Paid from
Free
Supported languages
assembly
Facts checked
22 Sep 2026

Where it wins
- Analyzes binaries without source code, including executable code and DLLs
- Supports conditional, logging, memory, and hardware breakpoints
- Offers memory modification, patching, and third-party plugins
Where it doesn't
- Limited to Microsoft Windows and 32-bit debugging
- Focused on assembly-level analysis rather than broader language support
- Development is frozen

Our verdict on OllyDbg

OllyDbg is a free 32-bit assembler-level debugger for Microsoft Windows. It is intended for analyzing binary code when source code is unavailable, with capabilities for executable analysis, direct DLL loading, debugging attached processes, and multithreaded application work. Its feature set also covers register, procedure, loop, API, string, and constant analysis, making it suited to users working directly with assembly-oriented program behavior.

The debugging toolkit is broad within that focus. Users can set conditional, logging, memory, and hardware breakpoints, inspect and modify memory, and trace registers and procedures. Executable patching and fixup updates extend the software beyond observation into binary changes. The third-party plugin architecture adds an extension path, while the ability to run without installation can simplify deployment on supported Windows systems. These capabilities make OllyDbg a practical fit for focused binary analysis and debugging workflows that do not depend on source code.

OllyDbg has a free pricing model, but registration is required for permanent or commercial use under its stated license terms. Its scope is also clearly defined: Microsoft Windows, 32-bit debugging, and assembly-level work. Development is frozen, which matters for teams seeking an actively developed debugger or broader platform coverage. Choose OllyDbg when free Windows binary analysis, process attachment, breakpoint control, memory inspection, and patching are the priorities. Consider another debugger when you need support beyond Windows, a wider language focus than assembly, or an actively developed product.

Your product? Our editors can test OllyDbg in depth and publish a review, labelled as paid · from $149/mo →

OllyDbg pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on ollydbg.org

OllyDbg fact sheet

Free plan	Yes
Paid from	Free
Supported languages	assembly
Target platforms	Microsoft Windows
Remote debugging	Not verified
Conditional breakpoints	Yes
Exception breakpoints	Not verified
Time-travel debugging	Not verified
Core dump debugging	Not verified
Deployment	Desktop
Platforms	Windows
Support	Email, Community, Docs
Built for	Solo, Small business (editorial estimate)
Pricing	Free plan
Website	ollydbg.org
Facts checked	22 Sep 2026

Alternatives to OllyDbg

See all OllyDbg alternatives →

Used OllyDbg? Be the first to review it

The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used OllyDbg 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.

Write a reviewTwo minutes · verified accounts only · read by an editor before it appears

Reviews come only from verified accounts. Sign in or create an account first — your e-mail is never shown.

Title

Your review

0 characters · at least 80, up to 3,000

Pros (optional · one per line)

Cons (optional · one per line)

Your name (shown with your review)

Role (optional)

Company (optional)

How long have you used it?

I've used OllyDbg myself and this is my honest opinion — nobody paid or asked me to write it.

Posted from your verified account. Reviews appear after an editor reads them, usually within two working days.

Featured on iTechGuides

OllyDbg is listed in our Debuggers directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/ollydbg/"><img src="https://www.itechguides.com/best/badge/ollydbg.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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.

Last updated 7 Oct 2026 · How we research and update