01
Describe the world
Pick a version, mark biomes and structures as required or preferred, set distances, spawn rules and a candidate budget.
Minecraft Java · 1.0 → 1.21native search engine
Find the world
you actually
described.
MCASF scans thousands of Java seeds with a native Cubiomes engine, filters them against your biome, structure, spawn and distance rules, then shows you exactly why each world ranked where it did.
No game launches · No fabricated screenshots · No “every seed” claims
Seeds examined here
measured by the native engine
Searches run
stored in PostgreSQL
Qualified worlds
passed every mandatory gate
Engine
C + Rust
THE PIPELINE
Three steps, real data at every one.
02
Let the engine scan
Each candidate gets a spawn estimate, a biome survey, structure prediction and — where supported — biome viability checks.
03
Inspect and copy
Open a candidate for the full checklist, maps, coordinates and the seed formatted exactly as Minecraft expects it.
WHAT IS ACTUALLY RUNNING
A search tool, not a mockup.
Native, not cinematic
Biomes, structures and spawn are sampled by Cubiomes in C, orchestrated by Rust. No Minecraft client is launched per candidate.
Mandatory vs. preferred
Required biomes and structures are hard gates. Preferences only move the score, so one missing optional feature never hides a good world.
Scores you can audit
Every result carries a checklist: what was required, what passed, the measured distance and the points it earned.
Progress from the workers
The live page reads counters incremented by the search threads. Throughput appears only once there is a real measurement.
Maps from the same sampler
Biome grids and structure markers come from the engine that ranked the seed — not a decorative tile set.
Reproducible searches
Candidates derive from a recorded job seed. Re-run a search with the same configuration and you get the same candidate stream.
STARTING POINTS
Presets that are just criteria.
Every preset opens in the builder fully editable — no hidden rules.
Speedrun start
Village and ruined portal near spawn on 1.16.1 — the classic any% setup.
Scenic survival
Cherry grove, meadow and jagged peaks within a short walk of spawn.
Village home
A village close to spawn with plains around it. Simple, reliable start.
Island survival
Spawn on land surrounded by ocean, with mushroom fields a boat ride away.
Structure hunter
Village and ocean monument guaranteed nearby, mansion on the wish list.
Survival essentials
Plains or forest at spawn, a village in reach, a ruined portal for the nether.
READ THIS BEFORE YOU SEARCH
Predictions are useful. Pretending is not.
What MCASF does
- Version-gated features — unsupported combinations are rejected, not approximated.
- Verification labels: predicted, biome-viable, or explicitly unsupported.
- Cancellation and time limits that actually stop the workers.
- Accounts that keep your searches, profiles and favorites private to you.
What it will never do
- Bedrock seeds — a different generator, refused rather than guessed.
- In-game screenshots — no renderer is installed, so the API says so.
- Guaranteed loot or speedrun times — those are not predictable from a seed.
- "All seeds" — a search examines the candidate budget you choose.
READY WHEN YOU ARE
Describe a world. Watch the seeds arrive.
Start with a preset or build the exact requirement list. Searches can be cancelled at any time and every result explains itself.