Best AI API Tools & Software in 2026 (Free & Paid)
AI APIs provide programmable interfaces for integrating machine learning functionalities, enhancing applications with capabilities like natural language processing and image recognition.
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APIMart delivers affordable, unified access to 500+ AI models—including Sora 2, GPT Image 2, and Claude—via one OpenAI-compatible API with up to 70% cost savings.
Fern automatically generates idiomatic SDKs and branded API documentation from your OpenAPI spec, so you can deliver an exceptional developer experience without the maintenance overhead.
Nango lets developers build, run, and maintain scalable product integrations with 700+ APIs using code-first, AI-assisted workflows.
Nylas is a unified communications API that lets developers embed email, calendar, scheduling, and meeting intelligence into any app—fast, securely, and at scale.
Kong AI Gateway is the unified platform for securely managing, governing, and monetizing AI agents and LLM traffic alongside traditional APIs.
Supabase is the open-source Postgres development platform that gives you a scalable backend with database, auth, realtime, storage, and AI features—all in one integrated suite.
PyTorch is a flexible, open-source deep learning framework trusted worldwide for research, development, and production AI applications.
Pluggy is a developer-friendly Open Finance API that unlocks secure access to financial data and instant payments across Brazil’s banking ecosystem.
Milvus is a high-performance, open-source vector database designed for GenAI applications, offering fast search, scalability, and easy integration with popular AI tools.
Devnagri, India's #1 AI-powered translation engine, helps businesses localize content 5x faster and more accurately, enhancing engagement and trust across multiple Indian languages.
NVIDIA NIM APIs provide cutting-edge AI models and optimized runtime for building enterprise-grade generative AI applications. From gaming to healthcare, it’s your one-stop solution for AI innovation.