Prompt OS • Router + Prompt Lab • Open Core.
PromptLab: the Prompt OS for building, testing, and evolving prompts across models
Stop shipping prompts as fragile strings in code. PromptLab turns prompts into living assets:
versioned, testable, measurable, and portable — with model routing and cost control built in.
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Built for teams shipping AI features and AI agents in production.
Multi-model execution
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Prompt versioning + releases
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Rule-based evaluation
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Optional hubs: OpenRouter, fal, more
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Prompts aren’t static. They’re a system.
Most teams treat prompts like strings — scattered across codebases, Notion pages, and tribal knowledge. When a model changes, costs spike, or output drifts, production breaks. PromptLab gives prompts a lifecycle: define, run, evaluate, release, and improve.
Versioning & Releases
Treat prompts like code. Diff changes, publish versions, roll back instantly.
Multi-Model Execution
Run the same prompt across models/providers. Use hubs like OpenRouter or direct vendor APIs.
Evaluation by Default
Validate output format, JSON schema, required keys, regex rules—before it hits your product.
How PromptLab works
Create a PromptSpec with inputs, template messages, and output constraints.
Execute against any configured provider/model. Add fallbacks to reduce failures.
Apply rule-based checks for format, schema, and consistency. Catch regressions early.
Promote versions to dev/prod. Export/import bundles to reuse prompts across projects.
Want smarter routing and automated improvements? See PromptLab Cloud.
Open Core for rapid adoption. Cloud for intelligence.
PromptLab is designed to become the default “Prompt OS”. The open-source core gives you ownership and portability.
The cloud edition adds multi-company governance and intelligence that improves prompts over time.
PromptLab Core (Open Source)
PromptSpec standard + versioning
Local registry & bundles (export/import)
Execution router with basic fallbacks
Rule-based evaluation (schema, keys, regex)
Provider credentials + connection testing
PromptLab Cloud (Paid)
Multi-project governance
Local registry & bundles (export/import)
Budgets, quotas, audit logs
Prompt analytics + performance tracking
Model availability monitoring at scale
Smart routing policies (cost/latency/quality)
Start with the open-source core. Upgrade when you need governance and intelligence.
What you can build with PromptLab
AI agents & workflows
Build prompt-driven agents that remain stable when models change.
Content + research automation
Standardize research prompts, verification prompts, and publishing pipelines.
Enterprise copilots
Enforce output schemas, governance, and cost controls from day one.
Typical integrations
OpenAI, Gemini, Antrophic, Perplexity, OpenRouter, Fal.ai …etc
Custom model gateways
F.A.Q.
Frequently Asked Questions
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