Stashly is a UK-focused fish-keeping marketplace and discovery platform that brings listings from Facebook groups, websites, and classifieds into one searchable place. Rather than searching multiple sources individually, users can browse fish and aquarium-related items by category, explore listings on a map, and filter or save searches. Stashly covers tropical, pond, saltwater, and brackish fish, with popular categories including community fish, monster fish, koi, and free fish.

Its listings also feature corals, plants, aquariums, ponds, equipment, pumps, lighting, heating and cooling, water-care products, food, decor, tools, and plumbing. The platform helps users find new and second-hand items and connect with sellers; transactions are arranged directly with the seller. Members can save listings, track searches, and receive alerts about new items through WhatsApp or Facebook.

Stashly offers a mobile app for iOS and Android, along with a Buyer Pro plan that provides earlier access to recent listings; listings more than two days old remain available for free. The service also supports sellers and businesses with account tools and advertising options