Documentation

A deterministic benchmark for browser-use / Computer Use / Operator-style agents. 30+ signals across event trust, trajectory, environment fingerprint, and rendering surfaces. Scoring runs client-side — rules are visible in the page source.

How it works

Visit https://rendertest.xyz/. The page runs ~30 deterministic checks against your browser and renders a 0–100 score plus a per-check pass / warn / fail breakdown. Score = 100 − Σ(weight × failure), where each check's weight reflects how strongly it indicates an automated agent.

Two halves contribute to the score:

• Environment — runs on page load. Automation tells, UA / platform consistency, display, hardware, canvas / WebGL / audio surfaces, fonts, network triangle (IP geo × timezone × languages), privacy.
• Behavior — computed from your interactions with the pad. isTrusted ratio, pointer pressure, trajectory straightness, velocity jitter (CV), click dwell, inter-event timing CV, movementX/Y consistency.

Endpoints

GET /

Serves the analyzer page. No parameters. HTML only.

GET /ipinfo

Returns the visitor's public IP, country, region, city, ISP, ASN, and timezone via a server-side proxy of ip-api.com with a 6-hour LRU cache. The page uses this to render the network half of your report.

{
  "ok": true,
  "ip": "203.0.113.42",
  "country": "United States",
  "country_code": "US",
  "region": "Texas",
  "city": "Austin",
  "timezone": "America/Chicago",
  "isp": "Comcast Cable",
  "asn": "AS7922",
  "as_full": "AS7922 Comcast Cable Communications, LLC"
}

GET /health

Liveness probe.

GET /docs

This page.

Signal categories

Category	Examples	Max weight
Environment	navigator.webdriver, selenium markers, headless UA, document markers	25
UA / Platform	UA vs navigator.platform, UA Client Hints mobile flag	18
Display	screen non-zero, DPR range, headless default sizes	16
Hardware	hardwareConcurrency, deviceMemory, touch points	12
Rendering	canvas hash entropy, GPU renderer, audio sum, fonts	22
Network	timezone vs IP country, language vs country, ASN class	12
Behavior	isTrusted ratio, trajectory straightness, velocity CV, click dwell	14
Privacy	cookies, localStorage, Function.toString native	10

Scoring example

# the page outputs (client-side, never leaves the browser):
{
  "score": 87,
  "grade": "B — Looks human",
  "checks_summary": { "ok": 24, "warn": 4, "bad": 1, "total": 29 },
  "fails": ["chrome-runtime"]
}

License & source

Source is readable directly from the page (view-source:https://rendertest.xyz/). All scoring rules are deterministic and visible in the JavaScript — no obfuscation, no remote rule-evaluation. MIT.

Contact

Built by @andreehoan.