Time travel debugging AI for more reliable vibe coding
Hi HN, I'm the CEO at https://replay.io. We've been building a time travel debugger for web apps for several years now (previous HN post: https://news.ycombinator.com/item?id=28539247) and are combining our tech with AI to automate the debugging process. AIs are really good at writing code but really bad at debugging -- it's amazing to use Claude to prompt an app into existence, and pretty frustrating when that app doesn't work right and Claude is all thumbs fixing the problem. The basic reason for this is a lack of context. People can use devtools to understand…
Time travel debugging AI for more reliable vibe coding launched on March 4, 2025 with 129 votes, #342 of 7,215 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Replay.io combines time travel debugging technology with AI to help automate the debugging process for web applications. The platform records app behavior and provides AI systems with tools to explore and understand what happened during execution, addressing the gap where AI excels at code generation but struggles with problem-solving. It is designed for developers who use AI to build applications and need better debugging capabilities when things go wrong.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN, I'm the CEO at https://replay.io. We've been building a time travel debugger for web apps for several years now (previous HN post: https://news.ycombinator.com/item?id=28539247) and are combining our tech with AI to automate the debugging process. AIs are really good at writing code…
Does a similar job
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Time travel debugger for web development2021 · replay.io · ▲681Automated Penetration Testing for AI-Built Apps
Claude-replay – A video-like player for Claude Code sessionsMar 2026 · github.com · ▲105I got tired of sharing AI demos with terminal screenshots or screen recordings. Claude Code already stores full session transcripts locally as JSONL files. Those logs contain everything: prompts, tool calls, thinking blocks, and timestamps. I built a small CLI tool that converts those logs into an interactive HTML replay. You can step through the session, jump through the timeline, expand tool calls, and inspect the full conversation. The output is a single self-contained HTML file — no dependencies. You can email it, host it anywhere, embed it in a blog post, and it works on mobile. Repo:…
- WVWe vibe coded our team's issue tracker, knowledge base, telemetry boardDec 2025 · ▲8
Hi HN, I'm the CEO at https://replay.io. We've been working on time travel debugging for web development for a while (https://news.ycombinator.com/item?id=28539247) and more recently an AI app builder that uses that debugger to get past problems instead of spinning in circles (https://news.ycombinator.com/item?id=43258585). We've gotten to where we can pretty easily build apps to replace business-critical SaaS tools, some of which we're now using internally: * We built our own issue tracker to keep track of all our development projects, tickets, bug…
Progress AI ObservabilityAug 2026 · telerik.com · ▲168Hi HN! We’re the team behind Fiddler, and we recently built an Agent Cache feature. It works by capturing an LLM request/response pair and, once caching is enabled, serving subsequent matching calls locally so duplicate requests never hit the provider. It’s meant to reduce three pains that show up together in agent development: token cost, feedback-loop latency, and output non-determinism. We’d love to hear your thoughts.
Zipy.ai – Live web debugging with error monitoring and session replay2022 · zipy.ai · ▲57Hey HN commmunity, Karthik here! Super stoked to announce the launch of Zipy today. Launching the product that you've been so dearly working on for months is like sending your newborn to school for the first time. Excitement to nervousness, anxiety to thrill, all sorts of emotions hit you at the same time. But the entire team of Zipy is confidently looking forward to the feedback you guys have in store for the beautiful product we’ve built. In community we trust! Over the past decade, from being a Web Development Intern to a UX Designer and a Product Manager, I have seen the struggles that…
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