PimEyes vs Book Detective (formerly What is that Books?)

Upload a photo and PimEyes scans the open web for matching faces in seconds. The reverse image search engine compares your picture against billions of indexed images, then returns source links so you can see where your face appears online. You can upload up to 5 photos at 8 MB each, use the camera capture option, and start with a free search from the homepage.

Generic reverse image search matches pixels and logos. PimEyes focuses on facial recognition across the open web, with monitoring alerts, optional takedown guidance, and an opt-out flow if you do not want your face indexed. Paid tiers add blur-free results, higher daily search limits, and AI-generated reports, which matters when you are tracking unauthorized reuse rather than hunting for a similar stock photo.

Creators audit copyright on photos and designs. Everyday users check their digital footprint. Public figures and PR teams set alerts for new appearances. Legal and security teams run higher-volume investigations through Advanced and OSINT offerings.

PimEyes advertises 99.5% search accuracy, GDPR compliance, SSL encryption, and more than 500,000 users on the pricing page.

Book Detective is an AI book search engine that finds titles from vague plot memories, character details, or mood descriptions you type in chat. It started as an experimental tool called What is that Book on Joelbooks and now runs as a custom GPT in the OpenAI GPT Store with a curated dataset of 10,000+ titles beyond ChatGPT's training cutoff.

Keyword book finders choke on fuzzy prompts like "fantasy with dragons and a clever heroine." Book Detective combines GPT-4 with Joelbooks' editorial dataset of fresh fiction and nonfiction excerpts, updated weekly with upcoming releases ChatGPT alone cannot see. The trade-off is that it lives inside ChatGPT rather than as a standalone website, so you need a ChatGPT account to use the current version.

Readers who forgot a title but remember scenes use Book Detective to match fragmented descriptions against both the LLM and Joelbooks' quality-filtered catalog. Authors can submit books directly to the dataset. The original whatbook URL on Joelbooks now 404s; Book Detective is the documented successor as of May 2024.