Source: https://www.rightmodeler.com/vs

# Different question, different tool

Honest comparisons with routers, gateways, and eval platforms: what each tool decides, what it measures, and when to use which.

- [rightmodeler vs OpenRouter](https://www.rightmodeler.com/vs/openrouter): OpenRouter routes live traffic and, on Auto, picks models from community spend. rightmodeler replays your traces against outputs you accepted. They compose.
- [rightmodeler vs LiteLLM](https://www.rightmodeler.com/vs/litellm): LiteLLM runs your request path: one API, budgets, fallbacks. rightmodeler replays your traces offline to measure which model belongs at each step. Keep both.
- [rightmodeler vs Vercel AI Gateway](https://www.rightmodeler.com/vs/vercel-ai-gateway): Vercel AI Gateway serves and meters your live model calls. rightmodeler replays your traces to test cheaper models first. Complement: same credits, two jobs.
- [rightmodeler vs Braintrust](https://www.rightmodeler.com/vs/braintrust): Braintrust holds your agent to evals you author. rightmodeler checks cheaper models against the outputs you shipped, step by step. They compose.
- [rightmodeler vs LangSmith](https://www.rightmodeler.com/vs/langsmith): LangSmith watches, scores, and runs agents in production. rightmodeler reads its exported run trees and decides which model each step needs. Different job.
- [rightmodeler vs promptfoo](https://www.rightmodeler.com/vs/promptfoo): promptfoo tests what you ship next against cases you author. rightmodeler audits what you shipped against accepted outputs. Different stages of the same loop.
- [rightmodeler vs Not Diamond](https://www.rightmodeler.com/vs/not-diamond): Not Diamond predicts the best model per request, live. rightmodeler measures which model belongs at each step, offline, from your traces. Different clocks.
- [rightmodeler vs Martian](https://www.rightmodeler.com/vs/martian): Martian is a research lab with a name-the-model gateway; its router is legacy. rightmodeler replays traces offline to pick each step's model. Different jobs.