If you're looking for CaptionAI competition, AltText.ai is a good option. It offers AI-generated image alt text for more than 130 languages, which can improve SEO and accessibility for websites. It integrates with many CMS and e-commerce tools like WordPress and Shopify, and you can use it in a variety of ways with high-confidence descriptive accuracy. It charges by the credit, with prices from $5 to $229 per month, so it's a good option for a lot of situations.
Another good option is Visionati, which offers a broader suite of visual analysis tools, including image captioning and tagging with AI smarts. It's geared for digital marketing and storytelling, and it offers an API for custom integration. Visionati's tiered pricing plan accommodates small and large projects, with prices starting at $5 for 500 API credits and going up to custom enterprise deals.
If you're focused on social media and video, ImageToCaption is a good option. It uses AI to automatically caption images and videos, and it's got a customer list with more than 170,000 people, including Fortune 500 companies. Plans range from $0 to $100 per month, and it's designed to save you time and ensure you've got the right brand voice on Instagram and Facebook.