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If you want an Argos alternative that checks whether a change worked (requests, state, console) rather than whether its screenshots changed, Reticle is built for that. If you want open-source, agent-ready visual regression testing, Argos is a strong choice, and Reticle is not a pixel diff.
What Argos does
Argos is "an open-source visual regression testing platform for Playwright, Storybook, Vitest and Cypress" (argos-ci.com). SDKs upload screenshots from your tests; Argos diffs them against baseline builds, posts a PR status and offers review and flake stabilization.
It is already built for agents: a hosted MCP server lets agents inspect builds, read machine-readable diffs and submit review verdicts, and there are installable skills for Claude Code, Codex and Cursor (pricing page).
Pricing is public: Hobby free (5,000 screenshots a month), Pro $100 a month (35,000 screenshots), Enterprise custom (checked 2026-10-25). The platform is open source under MIT (GitHub).
What Reticle does
Reticle checks an AI coding agent's change from inside the running web app and returns a verdict with evidence. It reads the network calls, the application state and the console, and on React and Svelte it names the file:line to fix.
Your agent calls it through MCP while it works. Flows it drives are saved and replay deterministically, with no model in the loop. It also drives sites you don't own, reading network, console and DOM there; app state and file:line need its SDK in your build. The SDK is open source (Apache-2.0); the hosted platform runs the same checks on previews and pull requests.
Argos vs Reticle at a glance
| Argos | Reticle | |
|---|---|---|
| What it checks | Screenshots against baseline builds | Network, app state, console and DOM after each step |
| Where screenshots or flows come from | Your Playwright, Storybook, Vitest or Cypress tests | Flows your agent (or you) drive, saved and replayed |
| Agent integration | Hosted MCP server and agent skills | MCP tools the agent calls while it works |
| Pixels | Yes | No pixel diff; reads DOM and computed styles |
| Points to the fix | The changed screenshot | The failing request or state, and file:line on React and Svelte |
| Open source | Yes, MIT | SDK Apache-2.0; server FSL-1.1 |
| Pricing | Free; Pro $100/mo | Start free, no card; open-source SDK free |
Where Argos is the better choice
- You want pixel coverage. Argos diffs screenshots across the frameworks you already use. Reticle is not a pixel diff; in our benchmark a 2.3% CSS re-tint was caught by a screenshot and missed by Reticle (scorecard).
- You want the whole platform open source and self-hostable. Argos is MIT end to end.
- You want agents to review visual changes. Argos already gives agents diffs and a way to approve them over MCP.
- You want low, published pricing. The free tier and the $100 Pro plan are on its site.
Where Reticle is the better choice
- The bug does not change a pixel. A request that fires twice, a save that returns 200 and never persists, a store that disagrees with the page. Reticle checks the request count, the state and the console, so those fail even when every screenshot matches.
- You need the agent to know what to fix. The verdict names the failing request or state and, on React and Svelte, the source line.
- You do not want to write a suite first. Argos needs tests that take screenshots. Reticle saves the flows your agent drives and replays them deterministically.
- You want re-runs that cannot flake. The same saved flow replayed eight times gave one verdict all eight times.
On 88 seeded bugs, Reticle caught 85 with no false alarms; two of the other three are traps a correct tool must not flag, and one is a genuine miss. The method is in the benchmark scorecard.
Can you use both?
Yes. Argos tells your agent whether the UI looks different; Reticle tells it whether the change did what it should underneath. Both are open source and both speak MCP, so an agent can run them in the same loop.
See why a green check isn't proof, and the Percy alternative and Chromatic alternative pages for other visual tools.
Try Reticle in five minutes
Paste one line to your coding agent, and it installs and wires the SDK in your app:
Follow https://raw.githubusercontent.com/reticlehq/reticle/main/SKILL.md
Or run npx @reticlehq/core init yourself. The README has the details.
FAQ
What is the best alternative to Argos?
The best alternative to Argos depends on whether you want pixels or behaviour. For other visual regression services, look at Chromatic, Percy, Happo or Applitools. For checking that an agent's change worked in the running app, through network, state and console with the source line to fix, Reticle fits. They can run together.
Is Argos open source?
Yes, Argos is open source under the MIT license, and you can self-host it. Reticle is also open source in part: its in-app SDK is Apache-2.0 and its server is source-available under FSL-1.1, which becomes Apache-2.0 after two years. The two tools check different things, pixels versus behaviour.
Can Reticle catch visual regressions?
Reticle catches some visual problems because it reads the DOM and computed styles, but it is not a pixel diff. In its own benchmark a CSS colour change covering 2.3% of the screen was caught by a screenshot and missed by Reticle. For pixel-level coverage, run a visual tool such as Argos alongside it.
Why Reticle
Your agent says it works. Reticle checks.
- Checks each change inside the running app: network, state and console, not a screenshot.
- Returns a pass or fail with the evidence and the file:line to fix.
- Open-source SDK on your machine, or the platform on every preview and PR.
No credit card required.