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With AI, Everyone is a Dev. EveryDev.ai © 2026
    1. Home
    2. Developers
    3. Replay.io

    Replay.io

    Replay makes software behavior visible so developers and AI agents can understand and fix bugs. Its current flagship, Replay QA, autonomously explores web apps, records sessions, identifies bugs, and provides root-cause analysis and suggested fixes.

    Visit Website

    At a Glance

    1Tool Listed
    6Products
    11Capabilities
    Discussions
    San Francisco, CaliforniaHeadquarters
    2021Est.
    11Employees
    $5.7MRaised
    Focus Areas
    Automated Testing
    Bug Detection
    Browser Automation
    Connect
    Latest News
    Replay QA tests the app you built with AIJun 16, 2026
    How to Set Up Replay MCP with Codex and Claude Code in Under 10 MinutesJun 1, 2026
    Markets
    • Software engineering teams
    • Solo developers and small startups
    • Vibecoders and AI-assisted app builders
    • Agencies and consultants building client software
    • +3 more

    AI Tools by Replay.io

    (1)
    View Replay QA
    Replay QA tool icon

    Replay QA

    AI Web App Testing Agent

    Automated TestingBug DetectionBrowser Automation

    Discussions

    No discussions yet

    Be the first to start a discussion about Replay.io

    Latest News

    06/16/2026

    Replay QA tests the app you built with AI

    replay.io
    06/01/2026

    How to Set Up Replay MCP with Codex and Claude Code in Under 10 Minutes

    replay.io
    05/17/2026

    Replay QA launches as an autonomous web-app QA service

    replay.io
    04/19/2026

    Replay Time Travelogue: Improving Nadia’s debugging-with-AI results using Replay MCP

    replay.io

    Products & Services

    6
    Replay QA
    May 17, 2026

    Autonomous QA for web apps: an AI agent explores an app, creates reusable user journeys, runs them in a real browser with deterministic Replay recordings, and reports confirmed bugs with evidence, root cause, and suggested fixes.

    Replay for CI
    2026

    CI-oriented Replay integration for existing Playwright or Cypress tests; records runs, analyzes failures, and posts root cause and a proposed fix to pull requests.

    Replay QA API
    2026

    API for embedding Replay QA as a quality gate in software factories and AI coding platforms.

    Replay Browser and Replay DevTools
    September 15, 2021

    Deterministic record/replay debugging technology that captures application execution and lets developers inspect state by moving backward and forward through time; the original product launched with Replay Browser, Chrome, and Node.js support.

    Market Position

    Replay differentiates from conventional browser test generation, session replay, and observability tools by combining autonomous exploration with deterministic recordings and runtime-level root-cause analysis. Replay positions QA as an agent-compatible quality gate, competing for web-app QA and debugging workflows with Playwright/Cypress-based tools, BrowserStack, QA Wolf, Sentry, Datadog, and LogRocket, while its original time-travel debugger targeted the hardest frontend bugs.

    Leadership

    Founders

    BH

    Brian Hackett

    Stanford Ph.D. and former Mozilla engineer with about a decade working on systems underlying the Firefox browser engine; Replay's co-founder, former CTO, and current CEO.

    JL

    Jason Laster

    Replay co-founder and former Mozilla/Firefox engineer who worked with Brian on browser tooling and the deterministic record/replay technology; previously Replay CEO and later an advisor.

    Executive Team

    BH

    Brian Hackett

    Chief Executive Officer

    Stanford Ph.D.; spent about 10 years at Mozilla on Firefox browser-engine systems; Replay co-founder and former CTO.

    TD

    Thomas Daly

    Head of Product

    Product builder focused on the intersection of customers and product; works on product development at Replay.

    Founding Story

    Replay was started by engineers who had spent years at Mozilla fighting bugs that were difficult to reproduce or explain. They wanted to record exactly what software did and replay execution deterministically—rather than rely on screenshots, logs, or guesswork—so developers could inspect state forward and backward in time.

    Business Model

    Revenue
    $1.2 million estimated ARR in 2025 (third-party estimate).

    Revenue Model

    Usage-based subscriptions for Replay QA, measured in monthly credits, with enterprise private-cloud and on-premise offerings priced from a monthly starting point.

    Pricing Tiers

    Free
    $0

    25 credits per month; no time limit and no credit card required.

    Starter
    $17/month

    50 credits per month; $204 billed annually.

    Pro
    $170/month

    500 credits per month; $2,040 billed annually.

    Private Cloud
    $1,000+/month

    Customer-owned storage bucket and dedicated cluster resources.

    On-Prem
    $5,000+/month

    Replay pipeline, data, and compute run on customer-controlled infrastructure; volume can increase price.

    Private company; no IPO announcement or plan was identified.

    Target Markets

    Industries & Segments
    • Software engineering teams
    • Solo developers and small startups
    • Vibecoders and AI-assisted app builders
    • Agencies and consultants building client software
    • Companies with internal tools
    • Organizations needing private-cloud or on-premise QA infrastructure
    Use Cases
    • Testing AI-generated web apps before launch
    • Continuous QA on main-branch and pull-request deployments
    • On-demand testing of SaaS products, marketing sites, and internal tools
    • Debugging hard-to-reproduce frontend and full-stack bugs
    • Giving coding agents reproducible bug evidence and fixes
    • QA for solo builders, vibecoders, internal builders, agencies, and engineering teams
    Notable Customers
    • Vercel
    • Glide
    • Pantheon
    • Weights & Biases

    Quick Facts

    Headquarters
    San Francisco, California, United States
    Founded
    2021
    Entity Type
    Inc.
    Employees
    11
    Total Funding
    $5.7 million disclosed seed funding
    Investors
    Andreessen Horowitz, Felicis
    Office Locations
    San Francisco

    Funding History

    Seed$5.7 million
    September 2021
    Andreessen Horowitz

    History & Milestones

    March 31, 2026

    Replay announced Replay Precog, a time-travel debugging concept for code that has not yet been written.

    May 17, 2026

    Replay announced Replay QA, an autonomous QA service that explores web apps, creates reusable journeys, records runs, and produces actionable bug reports.

    February 2025

    Replay launched Nut.new and the Nut API, evolving its deterministic debugging technology toward AI-assisted app building and debugging.

    December 7, 2025

    Replay launched Replay Builder, positioning it as unlimited app building with flat pricing and built-in deterministic debugging, following Nut.new.

    2024

    Brian Hackett became CEO; Jason Laster stepped down as CEO and transitioned to an advisory role. The company shifted emphasis from standalone devtools toward demos and AI-assisted analysis.

    Key Capabilities

    11
    Autonomous exploration of web applications
    Automatic discovery and reusable recording of user journeys
    Deterministic runtime recordings rather than video-only capture
    Time-travel inspection forward and backward through execution
    Root-cause analysis with evidence and suggested fixes
    Structured bug reports exportable as Markdown for coding agents

    Integrations & Partnerships

    Platform Integrations

    • Web browser applications via public URL
    • GitHub repositories and pull requests
    • Playwright
    • Cypress
    • Replay Browser
    • Chrome
    • Node.js
    • Localhost/private networks through managed reverse proxy

    Key Partnerships

    GitHub App integration for main-branch and pull-request QA
    Integrations and customer relationships with Vercel, Glide, Pantheon, CodeSandbox, Metabase, Apollo GraphQL, and Weights & Biases
    Replay MCP integration for AI-assisted evidence gathering and debugging

    Connect

    Website
    replay.io
    GitHub
    replayio
    X / Twitter
    KaiteeShiks
    LinkedIn
    replayio
    YouTube
    @Replayio

    AI Topics

    3

    Replay.io focuses on these topics:

    Automated Testing(1)
    Bug Detection(1)
    Browser Automation(1)
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