Test, evaluate, and ship AI
that actually works
The developer workspace for LLM testing, model comparison, and prompt evaluation.
Summarize the following document in 3 bullet points. Focus on actionable insights. Keep each point under 20 words.
- Revenue grew 23% YoY driven by enterprise expansion
- Customer churn dropped to 1.2% after onboarding redesign
- Engineering team should prioritize API v3 migration
- Company saw significant revenue growth this year
- Churn reduction indicates improved user satisfaction
- Technical debt remains a concern for the team
No SDK required. No setup. Just sign in and start testing.
Everything you need to ship AI with confidence
From first prompt to production. One workspace.
Side-by-side comparison
Run the same prompt across Claude, GPT-4, Gemini, and Llama. See speed, cost, and quality in one view.
Revenue grew 23% YoY driven by enterprise expansion...
Company saw significant revenue growth this year...
Prompt versioning
Full version history with diffs. Branch, tag, and rollback prompts like code.
- Summarize the document in bullet points.
+ Summarize in exactly 3 bullet points.
+ Keep each under 20 words.
Evaluation engine
LLM-as-a-Judge scoring, custom eval rules, regex checks, JSON schema validation.
MCP server debugger
Paste a server URL, auto-discover tools, test with sample inputs, see the full JSON-RPC trace.
{"method": "tools/call",
"name": "search_docs",
"args": {"query": "auth setup"}
}
"Found 3 results..."
Regression testing
Save golden responses. Run tests on every prompt change. Know instantly if quality dropped.
Cost analytics
Track spending across all providers. See cost per prompt, per feature, per model.
Batch testing
Upload a CSV with 100+ test inputs. Run across models. See pass/fail rates at scale.
GitHub CI/CD
Connect your repo. Run prompt tests on every PR. Block merges if quality drops. Prompts become first-class code.
Confidence score
Every prompt gets a score based on regression results, hallucination risk, and cross-model stability.
Red teaming
One-click security scan. Run jailbreak and injection attacks against your prompt. Find leaks before attackers do.
Fix it for me
One click to get AI-powered prompt improvements. Shorter prompts, better structure, lower cost.
Shareable links
Share any prompt, comparison, or test result with a public link.
Environments
Switch between dev, staging, and prod. All variables change automatically.
Prompt chaining
Build multi-step workflows. Test entire agent pipelines end to end.
Fork collections
Fork a public collection, customize it, make it yours. Share for others to build on.
From idea to production in minutes
Write and test your prompt
Open the playground, pick a model, and start testing. Compare outputs across models in real-time. No setup, no SDK, no API keys to manage.
Evaluate and lock in quality
Define what a good response looks like. Set up eval rules, build a golden dataset, run regression tests. Get a confidence score before you ship.
Ship and monitor
Connect to GitHub for CI/CD. Run tests on every PR. Pipe production traffic back for continuous evaluation. Sleep well.
The MCP debugger you have been waiting for
Every developer building with MCP servers knows the pain. Cryptic JSON-RPC errors. No visibility into tool discovery. Hours spent debugging what should take minutes. Paste your server URL and get instant visibility into every tool, every parameter, every request and response.
- -Auto-discover all tools from any MCP server
- -Visual schema browser with parameter types
- -Test any tool with sample inputs
- -Full request/response trace like a network inspector
- -Record and replay failed agent sessions
- -Auto-generate mock servers from schema
Discovered Tools (6)
Request
{"method": "tools/call",
"params": {"name": "search_docs",
"arguments": {"query": "auth setup"}}}
Response
142ms{"content": [{"type": "text",
"text": "Found 3 results for auth setup..."}]}
Simple, transparent pricing
Start free. Scale when you are ready.
Free
For individual developers getting started
Get started free- 50 LLM calls/month
- 3 prompt collections
- 1 MCP server
- Side-by-side comparison (2 models)
- 2 environments
- 5 saved prompt versions
- Fork public collections
- Export to code
- Community support
Pro
For developers shipping AI to production
Get Pro- 2,000 LLM calls/month
- Unlimited collections + MCP servers
- Side-by-side comparison (6 models)
- Full eval engine + LLM-as-a-Judge
- Regression testing + golden datasets
- Batch testing (CSV upload)
- Confidence scoring
- "Fix it for me" optimizer
- Cost analytics
- Red teaming scans
- Prompt chaining
- Auto-generated docs
- Shareable links
- Scheduled test runs
- Unlimited environments
- Priority support
Team
For teams building AI products together
Get Team- 10,000 LLM calls/seat/month
- Everything in Pro
- Shared workspaces
- Prompt review workflows
- Role-based access control
- GitHub CI/CD integration
- Prompt SDK
- Shadow mode
- Comments on outputs
- Natural language test suites
- Audit log
- SSO (Google, GitHub, SAML)
- Dedicated support
Need unlimited calls, custom model hosting, or SLA guarantees? Talk to us.
Frequently asked questions
Stop guessing. Start shipping.
Join developers who test their AI before their users do.
Start testing freeFree forever. No credit card required.