Pick Terralith for 95+ new biomes and structures using only vanilla blocks. Pick Biomes O' Plenty for 50+ biomes with new trees, plants and building blocks, in the Nether and End too. Pick Tectonic to reshape terrain only. Tectonic pairs with both; Terralith with Biomes O' Plenty is allowed but can give very small biomes.
The three side by side
| Fact | Terralith | Biomes O' Plenty | Tectonic |
|---|---|---|---|
| What it changes | Biomes, structures, caves and terrain, vanilla blocks only | Biomes in the Overworld, Nether and End, plus new trees, plants and building blocks | Terrain shape only |
| Ships as | Data pack and mod (Fabric, Forge, NeoForge, Quilt) | Mod (Fabric, Forge, NeoForge) | Data pack and mod (Fabric and NeoForge to 26.3, Forge to 1.20.4, Quilt stopped at 1.21.4) |
| Newest Minecraft Java version with a file | 26.3, file 2.6.5+26.3 (27 September 2026) for data pack, Fabric and NeoForge | 26.3, file 26.3.0.0.13, a beta (2 October 2026) | 26.3, data pack 3.0.29 (22 September 2026), Fabric and NeoForge 3.0.31 (27 September 2026) |
| Runs on | Server required, client optional | Client and server required | Server required, client optional |
| Licence | Stardust Labs License, no licence file found in its repository | All rights reserved | MIT on Modrinth, no licence file found in its repository |
What each one changes in world generation
All three sit in our world generation mods listing and all three act when chunks are first generated. For how the two file types differ in general, see world generation mods versus data packs.
Terralith
Terralith
@Apollo · Data Pack
Checked Source and install notes
Terralith adds over 95 biomes and updates almost every vanilla biome, according to its Modrinth page. It also adds canyons, shattered biomes, floating islands, deep ocean trenches, structures such as Spires and Fortified Villages, and caves such as the Underground Jungle and Frostfire Caves. Its CurseForge FAQ stresses that it uses only vanilla blocks, so no new wood types appear in your inventory. The trade-off: by default it replaces vanilla granite, andesite and diorite blobs with dedicated cave biomes, and an official add-on restores them.
Biomes O' Plenty
Biomes O' Plenty
@Forstride · Java Mod
Checked Source and install notes
Biomes O' Plenty adds 50+ biomes with what its page calls vanilla-esque flair, across the Overworld, Nether and End. It adds new plants, flowers, trees and building blocks as well. Those new blocks are the main difference from Terralith: you gain content to build with, and the mod must be present on both client and server.
Tectonic
Tectonic
@Apollo · Java Mod
Checked Source and install notes
Tectonic's page describes terrain shapes and lists no new biomes. Continents generate thousands to tens of thousands of blocks wide, mountain ranges can stretch for tens of thousands of blocks and approach the build limit, and oceans are deeper than vanilla, reaching into the deepslate layer. It also lists underground rivers, lava tunnels, canyons, dunes and plateaus. It supplies shape; biomes come from vanilla or from another project.
Data pack or mod, and what you need installed
Terralith and Tectonic ship both ways; Biomes O' Plenty is a mod only. A data pack needs no loader. The newest Terralith data pack and the newest Tectonic data pack list no dependencies. For the steps, see installing data packs and installing mods on Java.
- Terralith mod. From 2.6.0 it differs from the data pack and gains a config file and extra world types. The newest Fabric and NeoForge files require Lithostitched. The newest Forge and Quilt file (2.5.14) requires nothing.
- Biomes O' Plenty. The newest files for all three loaders require GlitchCore, and the Fabric one also requires Fabric API. Older Fabric and Forge files for 1.20.1 to 1.21.11, and older NeoForge files for 1.20.4 to 1.21.11, also list TerraBlender.
- Tectonic mod. The newest Fabric file requires Fabric API and Lithostitched, and the newest NeoForge file requires Lithostitched. With the mod version installed, vanilla Ocean Monuments generate deeper to compensate for the deeper oceans.
Loaders and newest supported versions
- Terralith. Data pack 1.19 to 26.3. Fabric 1.18.2 to 26.3. NeoForge 1.20 to 26.3. Forge and Quilt 1.18.2 to 1.21.11, ending at 2.5.14 (16 December 2025).
- Biomes O' Plenty. Fabric 1.20.1 to 26.3. Forge 1.7.10 to 26.3. NeoForge 1.20.4 to 26.3. The newest files are betas.
- Tectonic. Data pack and Fabric 1.18.2 to 26.3. NeoForge 1.19.3 to 26.3. Forge 1.18.2 to 1.20.4, newest file 3.0.17 (8 November 2025). Quilt builds have stopped at 1.21.4 (17 February 2025).
Tectonic's page adds that its supported versions are 1.21.1 and 26.1, and that issues on other versions will not be fixed. If you run Forge or Quilt on a recent version, the table above shows where each project stops. Our Fabric vs Forge vs NeoForge comparison covers the loaders themselves.
Can you combine them
- Terralith with Tectonic. Terralith's page calls it fully compatible with the mod version of Tectonic. With the data pack versions, it says to use Terratonic instead of Tectonic. Tectonic's page says that with Terralith installed, its islands spawn Calderas and Volcanoes.
- Biomes O' Plenty with Tectonic. Tectonic's page names Biomes O' Plenty among the mods it works with, because they add biomes through TerraBlender or Biolith.
- Terralith with Biomes O' Plenty. Terralith's page says it works with most biome mods that use TerraBlender or an equivalent, but that biome-adding data packs are typically not compatible. Its CurseForge FAQ (19 January 2026) says the pair is compatible but can produce very small biomes, advises using one, and warns that too many world generation mods slow chunk generation.
No page we read covers all three together, so we cannot say how that mix behaves.
What adding or removing one does to an existing world
Biomes O' Plenty's page says you need a new world, or an NBT editor change to an existing one, or its biomes will not generate. Tectonic's page says nothing on adding or removing it. As a general rule, a data pack that changes world generation only affects newly generated chunks, so new terrain meets old terrain at a border. We would treat all three as choices made when a world is created.
Who should pick which
- Pick Terralith if you want a large biome and structure overhaul with no new blocks, or if players should join a server without a client install, since its client side is optional.
- Pick Biomes O' Plenty if you want new building blocks, trees and plants, and Nether and End biomes. Everyone connecting needs it installed.
- Pick Tectonic if you like vanilla biomes but want dramatic mountains, continents and deep oceans, or if you want that terrain under another biome mod.
- Pick Terralith plus Tectonic for biome variety with reshaped terrain, using the combination both pages describe.
We read each project's Modrinth page and release files on 5 October 2026, plus a CurseForge FAQ dated 19 January 2026. We did not generate worlds, so we make no claim about how any of them looks or performs.