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.
Wordtune helps writers turn sentences, paragraphs, or a draft into rewritten, shortened, expanded, or tone-adj...
Freemium
Free plan API
Yellow.ai Conversational AI provides conversational AI assistance for users who want interactive answers, foll...
Freemium
Free plan API
AI21 Maestro provides conversational AI assistance for users who want interactive answers, follow-ups and task...
Freemium
Free plan API
Aivo provides conversational AI assistance for users who want interactive answers, follow-ups and task-focused...
Freemium
Free plan API
Amazon SageMaker JumpStart provides AI-assisted capabilities for developers, AI engineers, or software teams.
Paid
API
Apidog helps developers api design, testing, documentation, and mocking environment for development teams..
Freemium
Free plan API
Apidog AI helps developers ai features for api design, documentation, testing, and request generation..
Freemium
Free plan API
ArtSmart helps creators generate, edit, or enhance images for practical design and visual-content tasks.
Freemium
Free plan API
AskYourPDF helps researchers work with source material, analyze information, and organize research tasks in a...
Freemium
Free plan API
Atlassian Intelligence provides conversational AI assistance for users who want interactive answers, follow-up...
Freemium
Free plan API
Axolotl provides AI development or engineering capabilities.
Freemium
Free plan API Open source
Chatbase AI provides conversational AI assistance for users who want interactive answers, follow-ups and task-...
Freemium
Free plan API
Chroma helps developers developer-focused database for embeddings and retrieval in ai applications..
Free
Free plan API
Cleanvoice AI provides podcast cleanup for creators, businesses, educators, and developers who need practical...
Freemium
Free plan API
Collaborative document and database workspace with AI tools, formulas, automations, and integrations.
Freemium
Free plan API
Cognigy.AI provides conversational AI assistance for users who want interactive answers, follow-ups and task-f...
Freemium
Free plan API
Contentful AI supports content platform with ai for teams that need a practical business workflow.
Freemium
Free plan API
Dixa provides conversational AI assistance for users who want interactive answers, follow-ups and task-focused...
Freemium
Free plan API
Dixa AI provides conversational AI assistance for users who want interactive answers, follow-ups and task-focu...
Freemium
Free plan API
DreamStudio helps creators generate, edit, or enhance images for practical design and visual-content tasks.
Paid
API
Drift provides conversational AI assistance for users who want interactive answers, follow-ups and task-focuse...
Freemium
Free plan API
Drift Conversation Cloud provides conversational AI assistance for users who want interactive answers, follow-...
Freemium
Free plan API
ElevenLabs provides voice generation for creators, businesses, educators, and developers who need practical au...
Freemium
Free plan API
Embold helps developers static analysis tool that identifies code-quality, architecture, and maintainability r...
Freemium
Free plan API
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.
