Freedom251 › AI Agent Observability Tools

Respan (formerly Keywords AI)

Free plan APISelf-hostedWeb

Visit Respan (formerly Keywords AI) Alternatives Pricing

Respan (formerly Keywords AI)'s own site

What Respan (formerly Keywords AI) is

Respan (formerly Keywords AI) is an AI gateway for routing model requests and observing the applications around them. Its OpenAI-compatible gateway sends requests to more than 1,000 models through one endpoint, with fallbacks, load balancing, retries, and response caching. The gateway may add 50 to 150 ms, which may not suit products with strict latency requirements. Respan records LLM calls, tool runs, retrievals, and agent turns as traces that include inputs, outputs, latency, and cost. Teams can evaluate sampled production traffic with a combination of LLM judges, code checks, and human review. Monitoring covers requests, errors, cost, latency, and tokens, with threshold alerts via Slack, email, or webhook. The integrations directory lists 171 connections, including OpenTelemetry, LangChain, OpenAI, Anthropic, AWS Bedrock, Slack, and PostHog. Respan lists API, self-hosted, and web platforms, and states support for SOC 2, GDPR, and HIPAA; a BAA is available for healthcare teams. Free is listed as free. Team is $199/mo billed annually; Enterprise pricing is custom.

Who it suits

Respan suits startup and enterprise teams that need to trace workflows, evaluate agent behavior, and monitor production systems. Its self-hosted option and listed HIPAA support may also matter to teams with those requirements.

What it does well

Routes requests to 1,000+ models through one endpoint
Traces calls, tool runs, retrievals, and agent turns
Evaluates traffic with LLM, code, and human review
Alerts cover requests, errors, cost, latency, and tokens
Offers API, self-hosted, and web platforms

What to know first

Gateway may add 50 to 150 ms
Team plan is $199/mo billed annually

Limits

Free includes 100k logs, 1k scores, 5 datasets, 2 evaluators, and 5 prompts. Team includes 100k logs, 10k scores, unlimited datasets, evaluators, and prompts, and 5 members; it is billed yearly at $199/mo.

Plans

Plan	Billed and limits	Price
Free	100k logs · 1k scores · 5 datasets · 2 evaluators · 5 prompts	Free
Team	Billed yearly · 10k scores · 100k logs · unlimited datasets, evaluators, and prompts · 5 members	$199 a year
Enterprise	Custom packages · volume discount · custom SLAs · dedicated support engineer · HIPAA BAA	On request

As respan.ai lists them, read 4 Oct 2026. The maker's own page has the final word.

Getting started

Visit the Respan website.
Choose the Free plan or review paid plan options.
Use the API, web platform, or self-hosted deployment option.
Connect an integration such as OpenTelemetry, LangChain, or Slack.
Route model requests through the OpenAI-compatible gateway.

Verdict

Respan combines model routing with tracing, evaluation, and monitoring in one product. Check the gateway's possible latency and plan terms against your requirements before choosing it.

Questions

Is Respan free?

Yes. Its Free plan costs nothing and includes 100k logs and 1k scores, among other limits.

How much does the Team plan cost?

Team is listed at $199/mo billed annually. It includes 100k logs, 10k scores, unlimited datasets, evaluators, and prompts, and five members.

Which platforms are available?

Respan lists API, self-hosted, and web platforms.

Does Respan support self-hosting?

Yes. Self-hosted deployment is listed as an Enterprise plan feature.

What security and compliance support does it list?

The homepage states support for SOC 2, GDPR, and HIPAA, and says a BAA is available for healthcare teams. Enterprise lists HIPAA compliance and a HIPAA BAA.

What latency can the gateway add?

The gateway quickstart says it may add 50 to 150 ms, which may not suit products with strict latency requirements.

Facts from Respan (formerly Keywords AI)'s own pages

Company background: The About page says Respan, formerly Keywords AI, began at the University of Illinois and joined Y Combinator's Winter 2024 batch. · respan.ai, 4 Oct 2026
Enterprise security: The Enterprise plan lists self-hosted deployment, Google and SAML SSO, HIPAA compliance, and a HIPAA BAA. · respan.ai, 4 Oct 2026
Evaluations: Evaluators can combine LLM judges, deterministic code checks, and human review, and can score sampled production traffic. · respan.ai, 4 Oct 2026
Gateway: Its OpenAI-compatible gateway routes requests to 1,000+ models through one endpoint. · respan.ai, 4 Oct 2026
Gateway latency: The gateway quickstart says the gateway may add 50 to 150 ms and may not suit products with strict latency requirements. · respan.ai, 4 Oct 2026
Integrations: The integrations directory lists 171 integrations, including OpenTelemetry, LangChain, OpenAI, Anthropic, AWS Bedrock, Slack, and PostHog. · respan.ai, 4 Oct 2026
Intended users: The About page says Respan helps teams trace workflows, evaluate agent behavior, and improve quality in production, and that startups and enterprise teams use it. · respan.ai, 4 Oct 2026
Monitoring: The product tracks requests, errors, cost, latency, and tokens, with threshold alerts sent through Slack, email, or webhook. · respan.ai, 4 Oct 2026
Privacy and compliance: The homepage states Respan supports SOC 2, GDPR, and HIPAA, and says a BAA is available for healthcare teams. · respan.ai, 4 Oct 2026
Product: Respan describes itself as an AI gateway with built-in observability, evaluations, and security testing. · respan.ai, 4 Oct 2026
Reliability: The gateway provides model fallbacks, load balancing, automatic retries, and response caching. · respan.ai, 4 Oct 2026
Support: The pricing page lists Community Discord for Free, email support for Team, and a dedicated support engineer for Enterprise. · respan.ai, 4 Oct 2026
Tracing: Respan captures LLM calls, tool runs, retrievals, and agent turns as spans in a trace with input, output, latency, and cost. · respan.ai, 4 Oct 2026