### [Respan](https://free.ilovefree.com/)

**Published:** 2026-06-21T09:24:00

**Author:** ilovefree

**Excerpt:** Freemium + From $199/month. Respan is an LLM engineering platform with observability, evaluations, and prompt optimization. Supports multiple LLMs, paid from $199/month.

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.



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