Haven't I Seen This Before?
by Limucc
Haven't I Seen This Before? is a Fabric utility that outlines copies of a Litematica schematic found in the loaded area around the player, including rotated and mirrored matches.
What it does
After a player loads a .litematic file in Litematica, the mod scans the chunks already loaded around them and draws an outline over each place where the build already exists. Rotated and mirrored copies are matched as well, so a build made long ago can be located again without searching by hand. Matching builds light up as the player walks around the area.
The mod is useful for finding builds across a large base, for example villager halls, iron farms and shops, and for tallying how many times a modular design has been placed. It only reads data that is already loaded on the client, the same kind of data Litematica and MiniHUD use, so it never reads server-side data and never edits a block. Nothing it does changes the world for anyone else.
Installation needs Fabric API, MaLiLib and Litematica, all placed in the mods folder. The mod is released under the MIT License, is not open source, and is published for Fabric only, in two game versions: 26.1.2 and 26.2. Its latest file, 1.1.0, targets 26.2 and was published on 2026-07-09.
Key features
Schematic outlines
Outlines mark each copy of the loaded Litematica schematic, including rotated and mirrored matches.
Loaded-area search
The search covers only the chunks already loaded around the player, so it runs without a server query.
Client-side overlay
The highlights are a visual overlay that exists only on the player's own screen and changes nothing in the world.
Copy counting
Players can see how many copies of a modular build they have placed, which helps keep large projects organized.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Litematica Companion is open source under the MIT License, works on Fabric 1.21 – 26.2 and is client-side only, like this mod. Cloudmatica is also client-side only and under the MIT License, but it is not open source and targets 26.1.2 and 26.2. Litematica Auto Ignite is open source under the MIT License, client-side only, and covers 1.21.11 – 26.1.2, a range that does not include 26.2.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Haven't I Seen This Before? | Fabric | 26.1.2 – 26.2 | Client-side only | 2026-07-09 |
| Litematica Companion | Fabric | 1.21 – 26.2 | Client-side only | 2026-09-06 |
| Cloudmatica | Fabric | 26.1.2 – 26.2 | Client-side only | 2026-08-07 |
| Litematica Auto Ignite | Fabric | 1.21.11 – 26.1.2 | Client-side only | 2026-05-19 |
Questions
Does Haven't I Seen This Before? need Litematica?
Is the mod needed on a server?
Which game versions does the latest file support?
Which Minecraft version should the mod match?
In the catalog
Haven't I Seen This Before? is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 13,894 mods support Minecraft 26.2.
More from Limucc
Similar mods
What the author says
Find every copy of your saved builds in the world around you — automatically. Load one of your Litematica schematics and HISTB? outlines every place that build already exists in the area loaded around you — including rotated and mirrored copies. A lightweight, client-side companion for MaLiLib / Litematica.
Official listing
- Modrinth page
- modrinth.com/mod/histb
- Owner
- Limucc
- Published
- 2026-06-01
- Updated on Modrinth
- 2026-07-09
- Facts verified
- 2026-10-15