TensorZero builds open-source tools for production-grade LLM applications: LLM gateway, observability, optimization, evaluations, and experimentation.
Keywords AI
Respan unifies LLM observability, evals, prompt optimization, and an AI gateway so teams can ship reliable AI applications.
About Keywords AI
Keywords AI (the homepage refers to the product as Respan) is a web-based platform for teams that build and run applications on large language models and AI agents. It provides an AI gateway that routes requests to many models through one API, along with tools for tracing, monitoring, and evaluating agent runs. The homepage also lists red teaming as a capability.
The gateway can switch models by changing a single value, fall back to another model when one errors or hits a rate limit, and apply budgets and rate limits per key, customer, or organization. Evaluation tools combine LLM judges, code checks, and human review into one scoring system, and test cases can come from production logs or uploaded CSV files. Monitoring covers requests, errors, cost, latency, and tokens, with alerts sent to Slack, email, or a webhook. Pricing is not stated in the source material, and the product is not open source.
Key features
- Single API endpoint for models across major providers, switched by changing one value
- Automatic fallback to the next listed model when one errors or rate-limits
- Budgets and rate limits set per key, per customer, or organization-wide
- Evaluator that combines an LLM judge, code checks, and human review into one score
- Alerts sent to Slack, email, or a webhook when a metric crosses a set threshold
- Tracing of LLM calls, tool runs, retrievals, and agent turns as spans
Best for: Teams building and operating LLM or agent applications that need model routing, monitoring, and evaluation in one platform.
Good for
- Routes requests to many models through one API endpoint
- Includes fallbacks, spend limits, and rate limits for controlling outages and cost
- Captures the input, output, latency, and cost of each step in an agent run
Keywords AI at a glance
- Website
- respan.ai
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
Keywords AI alternatives
Tools and sites you could use instead, ranked by how closely they match.
Confident AI provides evaluation, observability, red-teaming, and governance tools for testing and monitoring AI systems.
Bifrost by Maxim AI is an open-source AI gateway for LLMs, MCP and agents with routing, governance, guardrails and observability, supporting 8+ providers and 1000+ models via a drop-in SDK replacement.
FreemiumOpen source
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LLM Gateway routes, manages, and analyzes requests across more than 40 language-model providers through one API.
PromptLayer supports prompt versioning, LLM evaluations, and production monitoring with traces, logs, and regression sets.
Comet's Opik platform provides AI observability, agent testing, evaluation, and monitoring for developers.
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Keywords AI FAQ
Which models can be reached through the gateway?
The homepage states that one API endpoint reaches 1,000+ models across every major provider. Availability for a specific model may depend on the plan, which the source does not describe.
How are alerts delivered?
Alerts can be sent to Slack, email, or a webhook when a monitored metric such as cost, errors, latency, or tokens crosses a threshold the user sets.
Is the source code available?
No. The directory listing marks the tool as not open source, and no repository is listed.
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