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Best AI Developer Tools Tools (2026)
19 verified tools.
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LangSmith
Debug & evaluate LLM apps.
Freemium
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LiteLLM
Call 100+ LLMs with one SDK.
Open source
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Humanloop
LLM evaluation & prompt management.
Freemium
Verified Free
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Portkey
AI gateway & observability.
Freemium
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Jan
Offline ChatGPT alternative.
Open source
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OpenRouter
One API for every model.
Usage-based
Verified Free
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Helicone
Open-source LLM observability.
Freemium
Verified Free
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Ollama
Run LLMs locally.
Open source
Verified Free
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Cohere
Enterprise LLM and RAG platform.
Usage-based
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Predibase
40
Fine-tune & serve open LLMs.
Usage-based
Verified Free
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LM Studio
Run LLMs locally with a GUI.
Free
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Together AI
Run & fine-tune open models.
Usage-based
Verified Free
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PromptLayer
Prompt engineering & observability.
Freemium
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Groq
Ultra-fast LLM inference.
Usage-based
Verified Free
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Fireworks AI
Fast inference for open models.
Usage-based
Verified Free
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Cerebras
Fastest LLM inference.
Usage-based
Verified Free
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Vercel AI SDK
TypeScript toolkit for AI apps.
Open source
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Open WebUI
Self-hosted LLM web UI.
Open source
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Braintrust
Evals for AI products.
Freemium
Verified Free
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