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.
Salesforce Einstein Copilot provides conversational AI assistance for users who want interactive answers, foll...
Freemium
Free plan API
Sapling helps writers turn support messages, customer conversations, and business text into suggested completi...
Paid
API
Semantic Kernel helps developers sdk for integrating ai models, plugins, memory, and agent workflows into appl...
Free
Free plan API Open source
Sesame provides conversational AI assistance for users who want interactive answers, follow-ups and task-focus...
Freemium
Free plan API
Siena AI provides conversational AI assistance for users who want interactive answers, follow-ups and task-foc...
Freemium
Free plan API
Slack AI Search provides conversational AI assistance for users who want interactive answers, follow-ups and t...
Freemium
Free plan API
Stable Audio provides text to audio for creators, businesses, educators, and developers who need practical aud...
Freemium
Free plan API
Stack AI provides conversational AI assistance for users who want interactive answers, follow-ups and task-foc...
Freemium
Free plan API
Stoplight helps developers api design and documentation platform for openapi-based development workflows..
Freemium
Free plan API
Synthesia provides script-based presenter videos for business and training for creators, marketers, educators,...
Freemium
API
TypingMind helps users with multi-model workspace through an interactive AI chat experience.
Paid
API
Ultimate.ai provides conversational AI assistance for users who want interactive answers, follow-ups and task-...
Freemium
Free plan API
Veo provides Google's generative video models with audio in supported versions for creators, marketers, educat...
Paid
API
Webex AI Assistant provides conversational AI assistance for users who want interactive answers, follow-ups an...
Freemium
Free plan API
Windmill helps developers open-source developer platform for scripts, workflows, internal tools, and automatio...
Free
Free plan API Open source
Wordvice AI helps writers turn academic paragraphs, papers, or research text into edited prose, paraphrased te...
Freemium
Free plan API
Zenvia Chat provides conversational AI assistance for users who want interactive answers, follow-ups and task-...
Freemium
Free plan API
AI21 Studio provides AI development or engineering capabilities.
Paid
API
Apify helps with web automation and scraping for marketers, creators, site owners and SEO teams.
Freemium
Free plan API
Asana Intelligence provides conversational AI assistance for users who want interactive answers, follow-ups an...
Freemium
Free plan API
Azure AI Search provides AI-assisted capabilities for developers, AI engineers, or software teams.
Paid
API
Boomi supports integration and automation for teams that need a practical business workflow.
Freemium
Free plan API
Botmaker provides conversational AI assistance for users who want interactive answers, follow-ups and task-foc...
Freemium
Free plan API
Botpress Cloud provides conversational AI assistance for users who want interactive answers, follow-ups and ta...
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.
