Introducing the first post in a new series we’re calling Replay Time Travelogues.
Read @acemarke.dev 's retelling of his time travels through a gnarly React scheduling bug originally shared by @danabra.mov
Get your popcorn ready folks. It’s a real deep-dive!
Going to React Miami? Don’t miss Mark’s talk. He will be sharing for the first time the new time travel magic we’ve been conjuring over here.
Screenshot of a Markdown format MCP tool describing Zustand stores in a Replay recording
Screenshot of a Markdown format MCP tool describing Zustand state in a Replay recording
Screenshot of a Markdown format MCP tool describing TanStack Query caches in a Replay recording
Screenshot of a Markdown format MCP tool describing a TanStack Query cache entry in a Replay recording
Just shipped the first versions of the new Replay MCP tools for analyzing Zustand stores and TanStack Query caches!
We already had tools for React render insights and Redux actions+state. Now I'm adding more tools to give your agents insights into other libraries as well!
A Replay recording is like nothing else in your software delivery stack. Replay captures what happens at runtime in your web app.
One team said "Now that I see what Replay can do, we're going to add more Playwright tests!"
Go to replay.io to start shipping with confidence.
We built a benchmark to test how well AI agents actually debug web apps — 177 real, hard problems.
Results:
🥇 76% Claude Code + Replay MCP
🥈 68% Codex
🥉 61% Claude Code (no Replay)
📉 48% Gemini
Time travel debugging is the difference!!
Full report → web-debug-bench.replay.io
Just shipped new RecordingOverview and ReduxActions tools for Replay MCP! Overview surfaces renders, test failures, errors. Actions is Redux DevTools for agents.
Ran against a real React 19 upgrade E2E failure recording, and an agent nailed the cause and fix in 30s! Exactly what we want to enable!
This was a _great_ discussion! Got to share a lot of details on my work maintaining Redux (including WIP React-Redux optimizations), as well as the work I'm doing for my day job @replay-io.bsky.social and building time-travel debugging analysis that understands React and Redux deeply.
a large light panel lowered down on a sound stage in front of a set
a large sound stage with multiple people working on lights and set design
two people standing next to a black box that has a closed hatch and the acronym “C.H.A.D.S.” stenciled on it. it also says “powered by Replay”
a large set with tables that read “BUILD STUFF” on the front
cooking something big with the @replay-io.bsky.social team, @itsthatladydev.bsky.social, and friends tomorrow 👀
coming soon to a @codetv.dev near you
Introducing Replay PreCog:
We got tired of waiting for bugs to happen. So we built a debugger that doesn't.
Replay Precog delivers deterministic root-cause analysis for bugs in code you haven't written yet. Arrest the bug before it commits the crime.
replay.io/precog
Development has changed. Why stick to old ways when debugging?
Fix your next bug with Replay MCP: replay.help/mcp
See Replay MCP in action: youtu.be/RjCMldpjgSY
Try it yourself: replay.help/mcp
Introducing: Replay MCP
Debug the runtime instead of debugging code.
A.I. has limited access to how your code executes, but that’s where most issues are. Replay MCP brings the browser debugger data into the conversation. It performs a root cause analysis and points the agent to the right place.
Time tracking and invoicing shouldn't cost you monthly! With "Invoicerator," you can track time, costs, and generate PDF invoices—all with a one-time setup. No monthly fees. Get professional invoices whenever you need them! 💼✨
Replay Builder, created by the team behind Replay, uses the same powerful debugging engine that handles billions of code activities. With AI-driven code writing, testing, and fixing, you get working software without the hassle of debugging yourself. 💻✨
builder.replay.io/
Knowledge bases can get costly as teams grow. With Replay Builder, create a customizable team wiki with rich text docs, kanban boards, and unlimited users. Build once and host it yourself!
Try Replay Builder: builder.replay.io/
When you build with Replay Builder, you get the full source code and database. Not an export. Not a locked format. The actual code.
Host it anywhere. Modify it anytime. No vendor lock-in. No surprise price increases.
Your tools should belong to you.
builder.replay.io/
Thanks Ryan! ❤️
Create your own issue tracker with Replay Builder! Customize triage systems, inboxes, and notifications to match your workflow. Host it on your infrastructure - no recurring fees.
builder.replay.io/
Most internal tools leave unused seats and unmet requests. Build what you need with Replay Builder—describe your needs and get a web app in minutes! Download the code, host it yourself, and keep moving! 🚀
builder.replay.io/
Vibe coding is great... until you hit a bug. AI can generate apps quickly, but debugging is tricky. Replay Builder combines recording and AI code generation, fixing issues accurately.
Read more:
blog.replay.io/introducing-...
