LLM observability and evaluation platform that traces every step of AI agent workflows, tracks costs and latency, and connects findings to concrete improvements.
Each check below is a fact we could verify from public sources. Unknown checks are excluded from the calculation instead of counting as a negative, and the score is pulled toward the midpoint when coverage is low — that is what data coverage reports.
Not determined: Webhooks / automation hooks, Open-source core, Self-hosting possible.
Not determined: Business / enterprise tier, Team collaboration, Admin / role management, SSO available, Security / compliance information, Customer data export, Documented support channels, Commercial plan exists.
Not determined: Free tier, Free trial, Concrete plan limits, No card required to start, Cancellation / refund policy, Mobile app, Desktop app.
Not determined: Privacy policy, Identifiable vendor, Published contact channel, Changelog / release notes.
Scores are calculated by AimostAll with fixed, public rules (methodology v1). AI assists only with factual research; it never picks the number. Placement and scores cannot be bought.
Respan is a production observability and evaluation platform built specifically for AI agents and LLM-powered applications. If you're shipping anything that calls a language model in production, whether that's a chatbot, a multi-step agent, or a document processing pipeline, this is the kind of tool that tells you what's actually happening inside it.
The platform captures full execution traces across messages, tool calls, routing decisions, memory reads, environment state, and final outcomes. Rather than seeing a single prompt and response, you get a timeline of every step an agent took, which makes debugging complex failures significantly faster. One user described the difference plainly: instead of spending an hour trying to reproduce a bug, they could see exactly what went wrong almost immediately.
Observability is only part of the picture. **Respan also handles evaluation**, letting you run automated scoring on production traffic or historical data. You can compare outputs across different model versions, prompt variants, or configurations and catch regressions before they affect users. The evaluation layer connects directly to the trace data, so findings aren't abstract metrics sitting in a separate dashboard.
A built-in LLM gateway lets you route traffic across more than a dozen providers including OpenAI, Anthropic, and others through a single base URL. Switching models or running A/B tests becomes a configuration change rather than a code change. Token usage, latency, and cost are tracked at the request level and rolled up by user, project, or environment, which is useful if you're billing clients or trying to understand where money is going.
Integration is reasonably painless. The OpenTelemetry-based SDK for Python and JavaScript uses decorators to instrument existing code without restructuring it. Teams that are already using LangChain or the Vercel AI SDK can connect with minimal changes. Respan processes over a billion logs and two trillion tokens monthly, so the infrastructure is clearly built to handle real scale.
The company was part of Y Combinator's W24 cohort, previously operating under the name Keywords AI before rebranding. It raised $5 million in seed funding from Gradient Ventures and Y Combinator in March 2026. The platform holds SOC 2, ISO 27001, and HIPAA certifications, which matters if you're building in regulated environments.
**Pricing starts free** with 100k logs and a limited evaluation quota. The paid tier for growing teams is a monthly subscription and unlocks unlimited datasets, evaluators, and prompt versions along with a private support channel. Enterprise pricing is custom.
For indie developers or small teams building AI products, the free tier is genuinely useful for getting started. The tool is developer-facing by nature, so there's no point pretending it's a no-code experience. If you're writing code that calls LLMs, Respan gives you the visibility you'd otherwise build yourself.
4653
2026-08-22
Medium confidence based on currently stored pricing metadata.
Respan is listed as a Programming tool on AimostAll.
License model: Freemium. Pricing label: Freemium.
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LLM observability and evaluation platform that traces every step of AI agent workflows, tracks costs and latency, and connects findings to concrete improvements.
Respan is listed on AimostAll as freemium with a pricing label of Freemium.
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