Your Minecraft Java modpack studio.
Search Modrinth, shape an idea, compare pack variants and export an installable .mrpack. Local-first. AI optional.
🌐 Website · 🧪 Browser demo · ⬇️ Download for Windows · 💬 Feedback
New in 0.3.14: Mod Studio 1.1.0 built in (textures up to 128 px, Blockbench first). 0.3.13: real see-through glass in the Translucent designs. 0.3.12: Fluid Glass, Crystal Glass and Translucent are see-through again, with an opacity control from 30 to 100 %. 0.3.11: a Performance check that estimates how your pack runs on your PC. 0.3.10: every dialog closes with Escape or a click outside, and a calmer top bar. 0.3.9: a unified mod picker, a calmer chat that follows your theme, a new assistant avatar and a readable design dialog. 0.3.8: Mod Studio 1.0.0 built in. 0.3.7: a new app icon and a personal desktop shortcut with your initial that keeps working. 0.3.6: calmer, consistent surfaces, a redesigned sidebar with an icon rail in UI 4/5 and a resizable window again. 0.3.5: fixes from a full UI audit (readable text in every theme and layout, no more top-bar overlaps). 0.3.4: the full Blockbench editor inside Mod Studio with guided steps, a redesigned AI chat in every layout, animated Minecraft backgrounds (switchable) and a glass launch animation.
0.3.2: UI 5 · Liquid Glass – frosted panels over your Minecraft world with soft transitions – plus fixes across all four existing layouts: readable headings on every theme, calmer chat follow-ups and a fully English interface.
0.3.0 – 0.3.1: the real Mod Studio built in, snapshot comparisons, cross-pack bookmarks, selective updates with automatic backups, dependency explanations and installable
.mrpackexport.
 🤖 Pack Assistant Turn an idea into a plan, then continue with one-click directions. |
 🔎 Modrinth catalog Filter by topic, version, loader, category, environment and popularity. |
 🧪 Pack Lab Roles, balance, snapshots, comparisons and a log-citing crash analyzer. |
 🎨 Five layouts Classic, Modern, UI 3, UI 4 and Liquid Glass – with nine themes and Minecraft backgrounds. |
| 🗂️ Projects | Multiple packs with their own Minecraft version, loader, selection and chat history. |
| 💬 AI planning (optional) | Review Modrinth suggestions before anything changes. ChatGPT account, OpenAI/Anthropic API, Ollama/Bionic, OmniRoute or a local OpenCode server. |
| 🔍 Search without AI | Modrinth works with no account; CurseForge with your own approved key. |
| 🧩 Dependencies | Required dependencies and client/server environments explained, including which parent pulled a library in. |
| ⇄ Snapshots | Name, compare (added / removed / changed) and restore pack variants. |
| ⬆ Safe updates | Preview compatible Modrinth updates, pick versions, automatic snapshot first. |
| 📦 Import & export | Share codes, public pack links and .mrpack in; exact-version .mrpack with hashes and loader version out. |
| ⭐ Bookmarks & favourites | Cross-pack bookmarks with notes; weekly Modrinth favourites from local daily snapshots. |
| 🛠️ Mod Studio | The real Studio opens in your browser on 127.0.0.1: pixel textures, Blockbench, Java source and supported JAR builds. |
| ↶ Undo / redo | Selection history with Ctrl+Z / Ctrl+Shift+Z (or Ctrl+Y). |
| 🌐 Local web view | Same workspace in your browser while the desktop app runs; keys never reach the browser. |
Limits, honestly: Modspire organises packs and reviews metadata. It does not install a loader or prove that a pack starts in a world. Shader export needs a compatible official Iris runtime on Fabric or NeoForge; CurseForge archive export is not supported yet. See the community test disclaimer.
Download the portable build from Releases and double-click it. The first launch asks for a local display name (not an account).
From source on Windows 10/11 with Node.js 22+ and pnpm:
pnpm install
pnpm start
pnpm test
pnpm dist # release/Modspire-<version>-Portable.exeBuilding needs the verified Mod Studio runtimes: pnpm studio:sync -- <path-to-minecraft-mod-studio> copies the Studio source and checks the JDK/Gradle archives.
Mod search works without AI. Credentials are stored by the desktop service and encrypted with Windows DPAPI-backed Electron safeStorage where available. Chat text and media go to the provider you choose, only when you send them. OpenCode chats run in a separate directory with all tools denied. Details: AI & privacy.
Getting started · Mod search · Interfaces & designs · Mod Studio integration · Troubleshooting · Patch log · Changelog
Found something confusing? Report a bug with your version, layout/theme, what you expected and what happened. Want to help? See CONTRIBUTING.md.
Modspire plans modpacks, Mod Studio builds mods, Minecraft Host runs the server for your friends. Every website has a switcher at the top to jump between them.
Original Modspire files are MIT; see LICENSE. The bundled Sign in with ChatGPT DevKit has a separate noncommercial licence at vendor/siwc-local/DEVKIT-LICENSE, so this combined repository is source-available under multiple licences rather than an OSI open-source release. See third-party notices.
Modspire is independent and not affiliated with or endorsed by Microsoft, Mojang, Modrinth, CurseForge, OpenAI or Anthropic. Minecraft and third-party names belong to their owners.