Respan
Respan (formerly Keywords AI) is an LLM engineering platform: an AI gateway, observability, and evals tool for LLM apps and agents. · Respan · AI
Overview
Respan (formerly Keywords AI) offers a free plan for its LLM gateway, tracing, and evals platform, ideal for small teams shipping and monitoring AI agents.
Good fit
Use Respan when you need an LLM gateway with built-in observability and evals for AI apps or agents, without building that tooling yourself.
- LLM app developers
- AI agent builders
- small teams needing LLM observability
- startups
Not a fit
Avoid if you need unlimited logs, longer retention, or enterprise compliance features beyond the free tier limits.
- you need more than 100,000 logs/month
- require SSO or audit logs
- need long log retention
Quickstart · 5 steps
- Sign up for a free Respan account.
- Get an API key from the dashboard.
- Point your existing OpenAI-compatible SDK at the Respan gateway endpoint.
- Set up an evaluator to score outputs against a test set.
- Watch requests, cost, and errors on the monitoring dashboard.
Other free ai options
Free tierWhat you get freeRiskCard
GitHub · AI
2,000 code completions per month · 50 chat requests per month (including Copilot Edits) · Agent mode, CLI, and MCP servers included with limited usage
Billing risk: None
No card
Google Cloud · AI
Sessions run up to 12 hours, depending on availability · GPU/TPU access heavily restricted on the free tier · Exact resource limits are not published and vary over time
Billing risk: None
No card
Google Cloud · AI
Free input and output tokens on supported models · Limited access to certain models · 5,000 free Google Search grounding requests/month, shared across Gemini 3.x models
Billing risk: None
No card
Hugging Face · AI
Unlimited public repos (best-effort free storage) · 100GB private storage · Storage limits apply across models, datasets, and buckets
Billing risk: None
No card