FireDBG – A Time Travel Visual Debugger for Rust
Hey HN, the is Chris, creator of FireDBG. We’ve been working on this debugger just about a year now. Time travel debugging isn’t a new concept, the new idea here is to use call tree visualisation to help us navigate the debug trace. It supports various Linux distros on x64 and macOS on x64 and M1. It’s only available for Rust right now, but we do want to bring this debugging experience to other programming languages. Please give it a try! Would love to know your thoughts. What’s your anecdote in debugging programs? My stupidity is usually in the form of: after a few hours of debugging, I…
In plain words
FireDBG is a time travel visual debugger for Rust that lets developers step backward through program execution to pinpoint bugs. It uses call tree visualization to help navigate debug traces, making it easier to understand how code reached a particular state. The tool runs on Linux and macOS (x64 and M1 processors). It aims to reduce debugging time by providing a clearer view of program flow and state changes over time, with plans to expand support to other programming languages.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey HN, the is Chris, creator of FireDBG. We’ve been working on this debugger just about a year now. Time travel debugging isn’t a new concept, the new idea here is to use call tree visualisation to help us navigate the debug trace. It supports various Linux distros on x64 and macOS on x64 and M1. It’s only available for Rust right now, but we do want to bring this debugging experience to other programming languages. Please give it a try! Would love to know your thoughts. What’s your anecdote in debugging programs? My stupidity is usually in the form of: after a few hours of debugging, I realised I misused a system API (e.g. messing up length with offset) but I kept thinking I had a logic error somewhere. By the way, I am looking for a technical co-founder. If you are also passionate about developer toolings and willing to commit to this problem, let's team up and build a company. You can find me on YC Co-Founder Matching (link in blog post).
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