AI API Builders - Directory w/ AI Reviews

Shipping reliable AI features means managing prompts, routing between models, and monitoring outputs in production. LiteLLM and Portkey AI provide unified API gateways so you can swap models without rewriting code. Humanloop and Vellum AI add prompt management, evaluation pipelines, and collaborative workflows for teams iterating on LLM-powered products.

LiteLLM 1 4.8 New LiteLLM Free Free Plan API Open Source 2 reviews LiteLLM is an open-source LLM gateway that provides a unified interface to call over 100 LLM APIs using the OpenAI format. It simplifies multi-provider AI development by standardizing API calls, managing authentication, tracking spend, and enabling load balancing across providers like OpenAI, Anthro BuildShip 2 4.7 New BuildShip Freemium Free Plan API 2 reviews BuildShip enables developers to create AI-powered APIs through a visual interface with natural language generation and backend integrations. Portkey AI 3 4.6 New Portkey AI Freemium Free Plan API Open Source 1 review Portkey AI is an AI gateway and observability platform that provides a unified API for accessing over 200 LLMs with built-in reliability features. It offers automatic retries, fallbacks, load balancing, caching, and detailed analytics for AI API calls. Portkey is designed for production AI applicati Humanloop 4 4.6 New Humanloop Freemium Free Plan API 2 reviews Humanloop is a platform for managing and improving LLM applications in production. It provides prompt management, evaluation frameworks, fine-tuning tools, and analytics to help teams systematically improve their AI features. Humanloop supports A/B testing of prompts, model comparison, and human fee Vellum AI 5 4.5 New Vellum AI Freemium Free Plan API 1 review Vellum AI is a development platform for building, testing, and deploying production-grade LLM applications. It provides tools for prompt engineering with version control, model comparison and evaluation, workflow orchestration, and monitoring of deployed AI features. Vellum is designed for engineeri Autoblocks 6 4.5 New Autoblocks Freemium Free Plan API 2 reviews Autoblocks offers product optimization for AI applications with automated testing pipelines, production observability, and prompt versioning. PromptLayer 7 4.2 New PromptLayer Freemium Free Plan API 1 review PromptLayer is a prompt management and observability platform that acts as a middleware between applications and LLM APIs. It logs every API request, tracks prompt versions, enables A/B testing, and provides analytics on model performance and costs. PromptLayer is built for development teams who wan