Stop shipping broken prompts
Test your LLMs like you test your code. Catch prompt regressions, compare models side-by-side, and ship with confidence.
No credit card required • Free forever for small teams
Customer Support Bot
Sound familiar?
Building with LLMs is exciting—until something breaks in production.
LLMs are unpredictable
Same prompt, different results. Model updates break your carefully tuned prompts without warning.
One change breaks everything
You tweak a system prompt to fix one issue, and three other use cases silently regress.
Manual testing doesn't scale
You can't manually review every response. Important edge cases slip through to production.
No quality gates
Traditional CI/CD can't evaluate LLM outputs. You're shipping and hoping for the best.
What if you could test your LLM outputs as rigorously as your code?
Four steps to bulletproof LLM outputs
From test creation to CI/CD integration in minutes.
Create Test Suites
Define test cases with inputs and expected behaviors. Pin to specific prompt versions.
Define Validation Rules
Combine static checks with AI-powered evaluation. No code required.
Contains Check
Must include "30 days"
LLM Judge
Tone is helpful and professional
Response Time
Under 2 seconds
Run Tests Anywhere
Execute manually, via API, or automatically in your CI/CD pipeline.
Analyze Results
Track quality over time, compare runs, and catch regressions early.
14
Passed
1
Failed
2.3s
Avg Time
Everything you need to test LLMs
Comprehensive testing tools built for modern AI development.
Group test cases by prompt, endpoint, or use case. Pin to specific prompt versions for reproducibility.
Instant, deterministic checks: contains, excludes, regex, JSON schema, response time limits.
AI-powered quality scoring with custom criteria. Catch subjective issues like tone, accuracy, and helpfulness.
Run the same tests across OpenAI, Anthropic, and Gemini. Compare cost vs quality at a glance.
Not just LLMs—test any HTTP API with the same powerful framework. REST, GraphQL, webhooks.
Quality gates for deployments. Pre-built configs for GitHub Actions, GitLab CI, and Jenkins.
Get notified instantly via Slack, Discord, or custom endpoints. Alert on failures or regressions.
Full history of prompt changes. Compare any two versions and see exactly what changed.
Built for how you actually work
From rapid prototyping to production monitoring.
Prompt Development
Test prompt variations before deploying. A/B test system prompts with real metrics, not gut feelings.
Regression Prevention
Catch when a model update breaks your carefully tuned prompts. Get alerts before users complain.
Model Evaluation
Compare GPT-4 vs Claude vs Gemini on your actual use cases. Make data-driven model decisions.
Compliance & Safety
Ensure responses don't contain harmful content, PII, or policy violations. Full audit trail included.
Cost Optimization
Find the cheapest model that meets your quality bar. Track token usage across test runs.
Works with your stack
Connect to the tools you already use. Set up in minutes.
Quick start with CLI
Simple, transparent pricing
Start free. Scale as you grow. No surprises.
Perfect for side projects and experimentation.
- 3 projects
- 100 test runs/month
- 2 team members
- Community support
- 7-day result retention
For teams building production AI applications.
- 25 projects
- 10,000 test runs/month
- 15 team members
- API access
- Email support
- 90-day result retention
- Webhooks & notifications
For organizations with advanced needs.
- Unlimited projects
- Unlimited test runs
- Unlimited team members
- SSO / SAML
- Dedicated support
- Custom retention
- Self-hosted option
- SLA guarantee
All plans include: Encrypted credentials • No vendor lock-in • Self-hosted option available
Built with support from
Frequently asked questions
Everything you need to know about Probefish.
Ready to ship with confidence?
Start testing your LLMs in minutes. No credit card required.
No credit card required • Free forever for small teams • Self-hosted available