Alternatives to TheFastest.ai

Token Monitor is a free desktop widget that tracks AI coding token usage, cost, and quota limits across 44+ tools and providers.

OpenCompass (司南) benchmarks LLMs, VLMs, and AI4S models on 100+ open evaluation datasets with dated leaderboards

Free public leaderboard benchmarking LLMs on competition math and Lean proof benchmarks like ArXivMath and ArXivLean.

Free open-source AI usage tracking and analytics that syncs your token and cost data from Claude, Cursor, ChatGPT and other tools onto a shareable dashboard.

Open-source LLM observability and agent evaluation you can trace, evaluate, and self-host for free.

Silico is Goodfire's interpretability agent for understanding and debugging the internals of your AI models.

ToolSpend tracks AI API spend across OpenAI, Anthropic, Google AI, Bedrock and Azure in one live cost dashboard.

Weights & Biases tracks ML experiments and traces LLM apps so teams ship AI models faster

Pre-trained finance AI models and API infrastructure for banks, insurers, and lenders, moving into agentic workflow orchestration.

Developer observability platform that traces, replays, and debugs AI agent runs across OpenAI, CrewAI, Autogen and 400+ LLMs

Local, MIT-licensed token and cost observability for AI coding agents — reads the logs your agents already write.

Replay your production LLM traffic on candidate models to see which behaviours change before you switch.

OpenJudge is an Apache 2.0 open-source AI evaluation framework shipping 50+ benchmark-validated graders for agents, LLMs, code, math, and multimodal models.

Arize Phoenix is open-source LLM observability: trace agent steps, run evals, and self-host your traces.

Dash0 is OpenTelemetry-native observability where Agent0 investigates incidents, finds root cause, and opens fix PRs.

LangSmith is agent and LLM observability: trace, monitor, and evaluate AI agents in cloud, BYOC, or self-hosted.

Open-source LLM observability and agent evals: trace, evaluate, and improve production AI agents with MIT-licensed tooling.

Galileo AI Evals turns offline evaluations into production guardrails that gate your AI agents in real time.

Opik by Comet turns LLM traces into root-cause groupings, eval scores and code fixes so agent teams stop shipping the same bug twice

Open-source OpenTelemetry tracing, versioning, and sessions for Python LLM apps—bring your own backend.

LLM evaluation, observability, and red teaming in one workspace — ship AI you can actually trust

TruLens traces AI agent runs with OpenTelemetry-native evals, showing where an agent fails and where you can cut cost.

Open source AI engineering platform for agent and LLM tracing, evaluation, prompt management, and ML lifecycle work.

Athina AI is a collaborative AI development platform for managing prompts, running LLM evaluations, and monitoring production traces in one

Fiddler AI is an enterprise AI control plane for agent observability, inline guardrails, and auditable AI governance.

Open-source AI coworker workspace that builds, schedules and ships agents to Slack or Telegram

Maxim AI evaluates, simulates and observes AI agents — with Bifrost, its open-source LLM gateway, handling routing, budgets and guardrails.

Honeycomb Query Assistant turns plain-English questions into HQL against live production telemetry.

PostHog is product analytics with session replay, feature flags, error tracking, and a context warehouse for you and your AI agents.

Open-source Python framework that replaces vibe checks with reproducible evaluation loops for RAG pipelines and AI agents.