Respan is a full-stack LLM engineering platform that centralizes the deployment and management of AI applications. It provides a unified gateway for routing traffic across multiple LLM providers, along with built-in observability, evaluations, and prompt optimization capabilities.
Core Platform Capabilities
Respan captures production data — agent steps, LLM calls, and user interactions — to provide end-to-end execution paths for debugging and understanding AI agent behavior. The platform integrates three key functions:
- Observability: Visibility into AI application performance and behavior, monitoring token usage, latency, and cost at the request level.
- Evaluations: Automated and human-in-the-loop assessment of model performance, prompt variants, and configurations.
- Prompt Optimization: Automatic prompt improvement using live production data, plus a prompt management system for versioning and deploying prompts without code changes.
AI Gateway and Cost Management
The AI Gateway routes traffic across multiple LLMs via a single endpoint, with load balancing, error handling, dynamic routing, and caching. It includes policy-based cost controls: spending limits per API key or project, rate limits, threshold alerts, and automatic request blocking when limits are exceeded.
| Feature | Description |
|---|---|
| Token Usage Tracking | Granular data on consumption patterns across LLM providers |
| Request-Level Monitoring | Latency and cost insights for individual API calls |
| Cost Control Policies | Spending limits per API key or project to prevent overruns |
| Rate Limits | Maximum requests or token usage within configurable timeframes |
| Threshold Alerts | Notifications when usage or cost thresholds are approached |
| Automatic Blocking | Stops requests from an API key once limits are exceeded |
Integration and Security
Respan supports integration with popular AI frameworks including LangChain, LlamaIndex, and Vercel AI SDK. The platform provides SOC 2 Type II, HIPAA, and ISO 27001 compliance, with AES-256 encryption at rest and TLS 1.3 in transit. GDPR data subject rights are fully supported, with EU data residency available.
Pricing
Respan follows a freemium structure. A free tier is available with limited usage for initial exploration. Paid plans start from $199/month, billed monthly, with a strict No Refunds policy. Higher tiers provide increased throughput, longer data retention, and additional evaluators and prompts.