"Web search services that don't require an API key" matching MCP connectors:

Drive real Android & iOS devices and web browsers from natural language for mobile + web QA. 145+ tools across device control, app management, automation sessions, browser automation, and flow recording / replay. Bearer-auth — get a token at robotactions.com → Profile → API Tokens.

Moderated usability testing: read sessions, notes, transcripts, reports, and draft test scenarios.

Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

Score any URL against a real design contract — 40 checks, A-F grade, token + motion validation.

Check that your AI is being logical. Free tool that mathematically catches contradictions in agent reasoning. No account needed. Also offers paid guardrails that converts natural language to formal verification proofs, that anyone can check succinctly.

Deterministic dataset-quality verdict, score and per-check facts for AI agents. No LLM.

Preflight QA for AI-agent deliverables with structured verdicts and repair guidance.

Accessibility pre-checks (WCAG/BFSG) in a real browser + statement drafts. Pay per call.

X-Z-CS AI validation with auditable reasoning. 8 active tools; 5 in maintenance. v0.5.58

Continuous website testing by Validoria — monitor security, SEO, performance, and accessibility.

Deterministic motion compiler + validator: reports WCAG 2.2.2 pause-path candidates, fail-closed.

Can an AI shopping agent find, understand and BUY on a store? Deterministic e-commerce audit /100.

Find MCP servers and check whether they actually respond, via live handshake probes.

Email compatibility analysis across 15 clients — preview, audit, fix, diff, deliverability.

Read-only, deterministic AI triage and readiness tools implementing Sophon's published rubrics.

Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.

Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.

Deterministic recipe verification engine — validates AI-generated recipes against master SOPs.