Crafty Seed Map vs SeedFinder

Crafty Seed Map is a free web tool for Minecraft Java players who want to inspect seed terrain and locate biomes, slime chunks, and structures. It accepts numeric seeds and text seeds, hashing text as the game does, and can display the Overworld, Nether, and End. A nearest-search function works outward from an origin in a spiral and checks structure candidates against biome requirements. Named, colored markers are stored in the browser for each seed, while a shareable URL preserves the seed, viewport, visible layers, and biome highlight. World generation runs locally in the browser, and the seed is not sent to a server. The biome layer uses a WebAssembly port of cubiomes, and structure locations are revalidated against biomes. Supported versions are Java Edition 1.18.2, 1.19.4, 1.20.6, 1.21.1, and 1.21.3; Bedrock Edition is not supported. The map is described as mobile-first and includes pinch-to-zoom controls, with no ads. Buried treasure, mineshafts, geodes, desert wells, and end gateways appear only at sufficiently close zoom levels.

SeedFinder helps Minecraft players locate structures near a world seed and player position, while SeedCracker searches for Bedrock seeds matching structures around supplied coordinates. Listed targets include villages, temples, ocean structures, ancient cities, mansions, portals, buried treasure, mineshafts, trail ruins, and trial chambers. The SeedFinder console runs scans in a browser using WebAssembly, without an account, key, or download. Its REST API accepts GET or POST requests and returns JSON, with examples for Python, Lua, and Node.js. The hosted API allows 60 requests per IP per minute, caps scan radius at 1,000 chunks, and returns no more than 200 results. An integration can display nearby structures in an in-game overlay through Flarial Client. SeedCracker requires coordinates for at least four structures. It also runs in the browser, but its hosted HTTP API is offline; the documented HTTP API runs on a local server. The site says browser scans run locally without connecting to the Minecraft world or a third-party seed map. The listed Free plan costs nothing.