OpenCV - OpenCV is the world's biggest computer vision library
AI Reverse Image Search - A better way to find similar images
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.
Immerse Reverse Image Search - With a deep understanding of artificial intelligence, immerse.zone provides a reverse image search engine for hundreds of millions of image libraries, including stock photos, vectors, videos, GIF, etc.
Clarifai - The World's AI
Thread Genius - Visual search and image recognition API for style-focused applications.