
Free / Open-sourceOpen-source AI gateway with observability and evals built in


12 alternatives to Keywords AI (Respan), matched by what they do.
| Rank | Tool & Tagline | Official Domain | Monthly Visits | MoM Growth | Pricing Model | Primary Market | Rating | Compare |
|---|---|---|---|---|---|---|---|---|
| ● | Keywords AI (Respan) | keywordsai.co | 0 | -1.83K (-100%) | Freemium | Global | 4.6 | Profile |
| 1 | Respan | respan.ai | 91.5K | -15.53K (-14.5%) | Freemium | United States | 4.5 | Compare |
| 2 | OpenRouter | openrouter.ai | 19.94M | -1.33M (-6.2%) | Paid | United States | 4.8 | Compare |
| 3 | LLM Gateway | llmgateway.io | 168.43K | -28.46K (-14.5%) | Freemium, Contact for Pricing | South Korea | 4.6 | Compare |
| 4 | Portkey | portkey.ai | 195.65K | -20.41K (-9.4%) | Freemium, Paid, Contact for Pricing | United States | 4.7 | Compare |
| 5 | Helicone | helicone.ai | 57.19K | -19.24K (-25.2%) | Freemium, Free Trial, Paid, Contact for Pricing, Free | United States | 4.6 | Compare |
| 6 | Maxim AI | getmaxim.ai | 121.35K | 11.07K (+10%) | Contact for Pricing, Free Open Source | India | 4.3 | Compare |
| 7 | LiteLLM | litellm.ai | 576.97K | 42.48K (+7.9%) | Freemium, Contact for Pricing | United States | 4.8 | Compare |
| 8 | LangWatch | langwatch.ai | 52.1K | 21.98K (+73%) | Contact for Pricing | United States | 4.6 | Compare |
| 9 | OrcaRouter | orcarouter.ai | 975.3K | -53.81K (-5.2%) | Freemium | United States | 4.3 | Compare |
| 10 | Manifest | manifest.build | 54.14K | -16.19K (-23%) | Free | United States | 4.5 | Compare |
| 11 | OpenLIT | openlit.io | 6.03K | -1.35K (-18.3%) | Free | United States | 4.7 | Compare |
| 12 | Flatkey | flatkey.ai | 49.13K | -33.92K (-40.8%) | Paid, Contact for Pricing | China | 4.1 | Compare |

Free / Open-sourceOpen-source AI gateway with observability and evals built in

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One API key for frontier models, 1,000+ AI tools, and one invoice
Free / Open-sourceOpen-source AI gateway with observability and evals built in
Free / Open-sourceOne OpenAI-compatible API to route, monitor and control 250+ LLM models
Free / Open-sourceOpen-source LLM observability and AI gateway for shipping reliable AI apps
Free / Open-sourceEvaluate, monitor, and govern your AI applications in production
Free / Open-sourceAgent observability, evals and governance for AI platform teams
One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control
Free / Open-sourceThe open-source LLM gateway that fixes your agents' requests on the fly
Free / Open-sourceOpen-source, OpenTelemetry-native observability and harness engineering for AI agents