# Reticle > Reticle verifies an AI coding agent's work from inside the running web app: it walks the flow and reads network, app state and console instead of screenshots, then returns a verdict with evidence. Open-source SDK plus a hosted platform. ## Definitions - [Verification layer](https://www.reticle.sh/blog/verification-layer): the canonical definition of a verification layer, with the four criteria any product claiming the term can be measured against. ## Pillars - [AI verification](https://www.reticle.sh/blog/ai-verification) - [AI QA](https://www.reticle.sh/blog/what-is-ai-qa-ai-in-software-quality-assurance) - [automated testing](https://www.reticle.sh/blog/automated-testing) - [exploratory testing](https://www.reticle.sh/blog/what-is-exploratory-testing-and-how-ai-agents-do-it) - [AI test automation](https://www.reticle.sh/blog/what-is-ai-test-automation-and-why-ai-generated-tests-break) - [test harness](https://www.reticle.sh/blog/what-is-a-test-harness-in-software-testing) ## Alternatives, integrations and guides - [ACCELQ alternative: a developer's check inside the running app](https://www.reticle.sh/alternative-to-accelq): An ACCELQ alternative for developers whose code AI agents write: open source, self-serve, and checks network, state and console inside the app, with the file:line. - [agent-browser alternative: from driving to a verdict](https://www.reticle.sh/alternative-to-vercel-agent-browser): Vercel's agent-browser is a fast CLI for agents to drive a browser. Reticle adds a pass or fail from network, state and console, replayed with no model. - [AI testing tools in 2026: what each kind actually checks](https://www.reticle.sh/ai-testing-tools): The AI testing tools teams use in 2026, grouped by what they really do: AI QA agents, managed services, visual AI, frameworks, agent browser tools and in-app checks. - [Alumnium alternative: read the app, not just the accessibility tree](https://www.reticle.sh/alternative-to-alumnium): An Alumnium alternative for agent verification: read network, state and console inside the running app, replay flows with no model, and get the file:line. - [Applitools alternative: check behaviour, not only how it looks](https://www.reticle.sh/alternative-to-applitools): An Applitools alternative for checking behaviour under the screen: Reticle reads network, state and console inside your running app, open source, start free. - [Argos alternative: check behaviour behind the screenshot](https://www.reticle.sh/alternative-to-argos): An Argos alternative for agent-written changes: Reticle reads network, state and console in the running app and names the file:line to fix, where Argos diffs pixels. - [Assrt alternative: verify the running app, not just generate tests](https://www.reticle.sh/alternative-to-assrt): An Assrt alternative for coding agents: instead of generating Playwright specs, check network, state and console inside the running app and get the file:line to fix. - [Autify alternative for teams whose code AI agents write](https://www.reticle.sh/alternative-to-autify): An Autify alternative for developers whose code AI agents write: verify each change inside the running web app, from network, state and console, fix located. - [Browser Use alternative for checking your own app](https://www.reticle.sh/alternative-to-browser-use): A Browser Use alternative for one job: letting your coding agent check its change inside your own running web app, with network, state and the file:line to fix. - [Bug0 alternative: let your coding agent verify its own changes](https://www.reticle.sh/alternative-to-bug0): A Bug0 alternative for teams that want their coding agent to verify each change itself, inside the running app, instead of a managed QA service at $2,500 a month. - [BugBug alternative: check behaviour, not just recorded clicks](https://www.reticle.sh/alternative-to-bugbug): A BugBug alternative for teams using coding agents: verify network, state and console inside the running app, replay flows deterministically, get the file:line. - [Bugster alternative: Bugster is winding down, what now?](https://www.reticle.sh/alternative-to-bugster): Bugster is winding down. What its users can do next, and how an in-app check like Reticle fits when your coding agent writes the code. Open-source SDK, starts free. - [Canary alternative: an open-source check inside your app](https://www.reticle.sh/alternative-to-canary): A Canary (runcanary.ai) alternative: an open-source SDK that checks your coding agent's change inside the running app and names the file:line to fix. - [Checkly alternative: verify the change before it ships](https://www.reticle.sh/alternative-to-checkly): A Checkly alternative for checking agent-written changes before merge: Reticle reads network, state and console in the running app. It is not a production monitor. - [Checksum alternative: verification your agent runs itself](https://www.reticle.sh/alternative-to-checksum): A Checksum alternative for teams that want their coding agent to check each change inside the running app: open-source, local, network, state and console. - [Chromatic alternative: check what the running app did](https://www.reticle.sh/alternative-to-chromatic): A Chromatic alternative for checking agent-written changes in the running app: network, state and console after each step, not component screenshots. - [Claude Code testing: prove the change works before Claude says done](https://www.reticle.sh/claude-code-testing): Claude Code testing that does not trust Claude's own word: check every change inside the running web app, from network, state and console, with the file:line to fix. - [Claude in Chrome alternative: proof the change worked](https://www.reticle.sh/alternative-to-claude-in-chrome): Claude in Chrome lets Claude Code look at and click your web app. Reticle adds a pass or fail from network, state and console that replays with no model. - [CodeceptJS alternative: verify the change, not only the scenario](https://www.reticle.sh/alternative-to-codeceptjs): A CodeceptJS alternative for checking agent-written web changes: Reticle reads network, state and console inside the running app and names the file:line to fix. - [Codex browser alternative: a verdict your CI can rerun](https://www.reticle.sh/alternative-to-codex-browser): The Codex app's built-in browser lets the agent open and click your app. Reticle adds a pass or fail from network, state and console that replays in CI. - [Codex testing: make Codex prove its change in the running app](https://www.reticle.sh/codex-testing): Codex testing that checks behaviour, not the agent's summary: verify each Codex CLI change inside the running web app from network, state and console, over MCP. - [ContextQA alternative: an open-source check inside the running app](https://www.reticle.sh/alternative-to-contextqa): A ContextQA alternative for developers whose code AI agents write: open source, self-serve, reads network, state and console inside the app, with the file:line. - [Copilot browser tools alternative: decide if it worked](https://www.reticle.sh/alternative-to-copilot-browser-tools): GitHub Copilot's browser tools let the agent drive your app in VS Code. Reticle adds a pass or fail from network, state and console, replayed with no model. - [CoTester alternative: proof from inside the app, in the agent's loop](https://www.reticle.sh/alternative-to-cotester): A CoTester (TestGrid) alternative for developers whose code AI agents write: open source, reads network, state and console inside the app, with the file:line to fix. - [Cursor browser alternative: a verdict, not just a look](https://www.reticle.sh/alternative-to-cursor-browser): Cursor's built-in browser lets the agent look at and click your app. Reticle adds a pass or fail from network, state and console, and replays it with no model. - [Cursor testing: verify the agent's change in the running app](https://www.reticle.sh/cursor-testing): Cursor testing that checks what the agent's change did, not what it says: verify each change inside the running web app from network, state and console, via MCP. - [Cypress alternative for AI coding agents](https://www.reticle.sh/alternative-to-cypress): A Cypress alternative for code your agent writes: Reticle checks network, state and console inside your running app and returns a verdict with the file:line. - [Datadog Synthetics alternative: check changes before deploy](https://www.reticle.sh/alternative-to-datadog-synthetics): A Datadog Synthetics alternative for pre-merge checks of agent-written code: Reticle reads network, state and console in the app. Not a production monitor. - [Debugg.ai alternative: check page changes from inside the app](https://www.reticle.sh/alternative-to-debugg-ai): A Debugg.ai alternative for coding agents: Reticle runs on your machine, reads network, state and console inside the app, and replays saved flows with no model. - [DevAssure alternative: verify each change from inside the app](https://www.reticle.sh/alternative-to-devassure): A DevAssure alternative that checks your coding agent's change while it works: network, state and console inside the running app, with the file:line to fix. - [Docket alternative: check what the app did, not where it clicked](https://www.reticle.sh/alternative-to-docket): A Docket alternative for agent-written web changes: Reticle reads network, state and console in the app and names the file:line, instead of replaying coordinates. - [Endtest alternative: verify the change, not just the steps](https://www.reticle.sh/alternative-to-endtest): An Endtest alternative for teams whose code AI agents write: open source, free to start, reads network, state and console inside the app, with the file:line to fix. - [Functionize alternative: an open-source check inside the app](https://www.reticle.sh/alternative-to-functionize): A Functionize alternative for verifying coding-agent changes: open-source, reads network, state and console inside the running app, and names the file:line to fix. - [Greptile TREX alternative: verify inside the app, before the PR](https://www.reticle.sh/alternative-to-greptile): A Greptile TREX alternative: instead of an agent watching the screen on each PR, verify network, state and console inside the running app, with the file:line to fix. - [Happo alternative: check the change, not only the pixels](https://www.reticle.sh/alternative-to-happo): A Happo alternative for agent-written changes: Reticle checks network, state and console inside the running app and names the file:line to fix, beyond pixel diffs. - [Heal alternative: verify the change your agent just made](https://www.reticle.sh/alternative-to-heal-dev): A Heal.dev alternative for checking a specific agent-written change: Reticle reads network, state and console in the running app and names the file:line to fix. - [IronBee alternative: in-app state and model-free replay](https://www.reticle.sh/alternative-to-ironbee): An IronBee alternative for verifying AI coding agents: Reticle reads app state, network and console inside your web app and replays flows with no model in the loop. - [Katalon alternative: let the coding agent prove its own change](https://www.reticle.sh/alternative-to-katalon): A Katalon alternative for developers whose code AI agents write: open source, no test IDE, and reads network, state and console inside the app, with the file:line. - [Keploy alternative: verify the web app, not only the API](https://www.reticle.sh/alternative-to-keploy): A Keploy alternative for the frontend: Reticle drives your running web app and reads network, state and console to verify an AI agent's change, with the file:line. - [mabl alternative: open-source verification for coding agents](https://www.reticle.sh/alternative-to-mabl): A mabl alternative for developers: an open-source SDK your coding agent uses to verify each change inside the running web app, from network and state. - [MCP servers for browser testing: which one gives your agent what](https://www.reticle.sh/mcp-browser-testing): MCP servers for browser testing compared: Playwright MCP, Chrome DevTools MCP, vendor MCP servers and Reticle, with what each lets a coding agent see and check. - [Meticulous alternative: verify behaviour, not just pixels](https://www.reticle.sh/alternative-to-meticulous): An open-source Meticulous alternative for teams whose code AI agents write: check network, state and console inside the running app, with the file:line to fix. - [Midscene.js alternative: check what the app did, not what it showed](https://www.reticle.sh/alternative-to-midscene): Midscene.js automates UIs in natural language by reading screenshots. Reticle verifies web changes from network, state and console, and replays them with no model. - [Momentic alternative: check what the app did, not just the steps](https://www.reticle.sh/alternative-to-momentic): A Momentic alternative for teams whose code AI agents write: open-source, runs inside your app, and checks network, state and console with the file:line to fix. - [Octomind alternative: Octomind is gone, what now?](https://www.reticle.sh/alternative-to-octomind): Octomind shut down in 2026. What former users can do now: keep the exported Playwright tests, and how an in-app check like Reticle fits for AI-written code. - [Percy alternative: verify behaviour, not just screenshots](https://www.reticle.sh/alternative-to-percy): A Percy alternative for agent-written code: Reticle checks network, state and console in the running app and names the file:line, instead of diffing screenshots. - [Playwright alternative for checking your agent's changes](https://www.reticle.sh/alternative-to-playwright): Looking for a Playwright alternative? Reticle checks an AI agent's change inside your own running app: network, state and console, with the file:line to fix. - [Playwright Test Agents alternative: verify, don't just generate](https://www.reticle.sh/alternative-to-playwright-test-agents): Playwright Test Agents plan, generate and heal specs. Reticle verifies each agent change from network, state and console, with a replay that needs no model. - [QA Wolf alternative: let your agent prove its own change](https://www.reticle.sh/alternative-to-qa-wolf): A QA Wolf alternative for teams that want their coding agent to verify its own change inside the app: open-source, local, network, state and console checks. - [QA.tech alternative: verification from inside the app](https://www.reticle.sh/alternative-to-qa-tech): A QA.tech alternative for teams whose code AI agents write: open-source, checks network, state and console inside the running app, and names the file:line to fix. - [Ranger alternative: verify agent work from inside the app](https://www.reticle.sh/alternative-to-ranger): A Ranger alternative for verifying coding agents' work: Reticle checks network, state and console inside your running web app and names the file:line to fix. - [Reflect alternative for developers using AI coding agents](https://www.reticle.sh/alternative-to-reflect): A Reflect alternative for developers: Reticle lets your coding agent check its change inside the running app, reading network, state and console, open source. - [Replay.io alternative: verify in the agent's loop, replay with no model](https://www.reticle.sh/alternative-to-replay-io): A Replay.io and Replay QA alternative: your coding agent verifies each change inside the running app, and saved flows replay deterministically with the file:line. - [Sauce Labs alternative: verify the change from inside the app](https://www.reticle.sh/alternative-to-sauce-labs): A Sauce Labs alternative for checking AI-written code: open source, reads network, state and console inside the running app, and names the file:line to fix. - [Shiplight alternative: read app state, not just the browser](https://www.reticle.sh/alternative-to-shiplight): A Shiplight alternative for coding agents: Reticle checks network, console and app state from inside your web app and names the file:line to fix. Open-source SDK. - [Shortest alternative: Shortest looks dormant, what now](https://www.reticle.sh/alternative-to-shortest): Shortest, antiwork's natural-language E2E testing library, has had no release since April 2025. Here are the options, and where Reticle fits for AI-written code. - [Skyvern alternative: verify your app, not automate a workflow](https://www.reticle.sh/alternative-to-skyvern): Skyvern automates workflows on any website with an AI agent. Reticle verifies web app changes from network, state and console, with a replay that needs no model. - [Spur alternative: verification inside the app your agent is building](https://www.reticle.sh/alternative-to-spur): A Spur alternative for developers whose coding agent should verify its own change: open-source, runs inside your app, checks network, state and console locally. - [Stably alternative: verify each agent change from inside the app](https://www.reticle.sh/alternative-to-stably): A Stably alternative for teams using coding agents: verify network, state and console inside the running app while the agent works, and get the file:line to fix. - [Stagehand alternative for testing the app you build](https://www.reticle.sh/alternative-to-stagehand): A Stagehand and Browserbase alternative for one job: checking your coding agent's change inside your own web app, from network, state and console. - [TesterArmy alternative: see what the app did underneath](https://www.reticle.sh/alternative-to-testerarmy): A TesterArmy alternative for web apps built by coding agents: open-source checks of network, state and console inside the running app, with the file:line to fix. - [Testim alternative for teams whose code AI agents write](https://www.reticle.sh/alternative-to-testim): A Testim alternative for developers using AI coding agents: Reticle checks network, state and console inside your running app and points to the file:line. - [TestMu AI (LambdaTest) alternative: verify inside the app](https://www.reticle.sh/alternative-to-testmu-ai): A TestMu AI, LambdaTest and KaneAI alternative for coding agents: verify network, state and console inside the running app and replay flows with no model. - [testRigor alternative: check what the code did, not only the steps](https://www.reticle.sh/alternative-to-testrigor): A testRigor alternative for teams whose code AI agents write: open source, reads network, state and console inside the app, and names the file:line to fix. - [TestSprite alternative: check the change from inside the app](https://www.reticle.sh/alternative-to-testsprite): A TestSprite alternative that runs inside your web app: your coding agent checks network, state and console after each change and gets the file:line to fix. - [TestZeus Hercules alternative for coding-agent workflows](https://www.reticle.sh/alternative-to-testzeus-hercules): TestZeus Hercules runs Gherkin tests with an AI agent for QA teams. Reticle verifies coding-agent changes from network, state and console, with a model-free replay. - [Thunders alternative: in-app verification for agent-written code](https://www.reticle.sh/alternative-to-thunders): A Thunders (Thunder Code) alternative for developers: open source, free to start, reads network, state and console inside the running app, with the file:line. - [Virtuoso QA alternative: evidence from inside the running app](https://www.reticle.sh/alternative-to-virtuoso-qa): A Virtuoso QA alternative for developers whose code AI agents write: open source, self-serve, and reads network, state and console inside the app to prove a change. - [WebdriverIO alternative: check your agent's change from inside](https://www.reticle.sh/alternative-to-webdriverio): A WebdriverIO alternative for agent-written web changes: Reticle reads network, state and console in the running app, replays flows, and names the file:line. - [Wopee alternative: verify a change, not crawl the app](https://www.reticle.sh/alternative-to-wopee): A Wopee alternative for agent-written web changes: Reticle reads network, state and console in the running app and replays flows with no model in the loop. - [Zof alternative: in-app verification for each agent change](https://www.reticle.sh/alternative-to-zof-ai): A Zof AI alternative for verifying agent-written web changes in the app: Reticle reads network, state and console and names the file:line. Open source, self-serve. ## Product - [Docs](https://docs.reticle.sh) - [GitHub](https://github.com/reticlehq/reticle) - [Platform](https://app.reticle.sh) - [Comparisons](https://www.reticle.sh/compare) - [Alternatives](https://www.reticle.sh/alternatives) - [Blog](https://www.reticle.sh/blog) ## Optional - [Full context](https://www.reticle.sh/llms-full.txt): the long-form briefing on what Reticle is, how it works and how it compares.