These tools expose an API, so you can call them from your own code rather than working through their interface. This is the list to start from if you are building AI into a product, a script or an automation.
Formula Bot provides AI-assisted capabilities for modern software or AI workflows.
Paid
API
CodeGeeX helps developers with AI-assisted coding, code understanding, and practical software development task...
Freemium
Free plan API
AI study assistant built around student questions, explanations and revision support. It is designed for pract...
Freemium
Free plan API
Amazon Polly provides cloud text to speech for creators, businesses, educators, and developers who need practi...
Paid
API
Netlify helps developers web development platform for deploying sites and applications with build automation a...
Freemium
Free plan API
Prezent helps users create or improve presentation content with AI for faster slide, visual, or delivery workf...
Paid
API
Anthropic API helps developers developer api for integrating claude models into software products and agent wo...
Paid
API
Codeanywhere provides AI-assisted capabilities for developers and software teams.
Freemium
Free plan API
AI code reviewer that analyzes pull requests with broader repository context and can test proposed changes.
Paid
API
Sourcegraph Cody helps developers with AI-assisted coding, code understanding, and practical software developm...
Paid
API
Cursor helps developers with AI-assisted coding, code understanding, and practical software development tasks.
Freemium
Free plan API
GitHub Copilot helps developers with AI-assisted coding, code understanding, and practical software developmen...
Freemium
Free plan API
An AI testing tool that automatically generates unit tests for Java code and integrates them into existing dev...
Paid
Free plan API
AI development tool that converts designs and prompts into frontend code and helps teams bridge design and dev...
Freemium
Free plan API
Grammarly helps writers turn typed text, documents, emails, or selected passages into corrections, rewrites, t...
Freemium
Free plan API
Higgsfield provides multi-model AI video generation and motion controls for creators, marketers, educators, an...
Freemium
API
Picsart helps creators generate, edit, or enhance images for practical design and visual-content tasks.
Freemium
Free plan API
Tensor.Art helps creators generate, edit, or enhance images for practical design and visual-content tasks.
Freemium
Free plan API Open source
Z.ai helps users with GLM assistant through an interactive AI chat experience.
Free
Free plan API
SillyTavern AI provides conversational AI assistance for users who want interactive answers, follow-ups and ta...
Freemium
Free plan API
Kiro helps developers with AI-assisted coding, code understanding, and practical software development tasks.
Freemium
Free plan API
Pixlr helps creators generate, edit, or enhance images for practical design and visual-content tasks.
Freemium
Free plan API
Refact.ai helps developers with AI-assisted coding, code understanding, and practical software development tas...
Freemium
Free plan API Open source
Zed helps developers with AI-assisted coding, code understanding, and practical software development tasks.
Freemium
Free plan API Open source
What to check before you choose
Having an API is the start of the question rather than the end of it. Rate limits, pricing per call, whether there is a sandbox to develop against, and whether your inputs are retained or used for training all vary enormously, and all of them shape whether a tool is viable at scale. Official API documentation is the only reliable source for those details, and it changes often — treat this list as a way to find the candidates, then verify the specifics with the vendor before you build.
