Refract

Refract is a free software launcher for managing Minecraft modpacks on Windows, macOS, and Linux. It supports packs from Modrinth, CurseForge, and FTB, with a built-in catalog for browsing compatible content. Each pack runs in a separate instance, keeping mods, resource packs, worlds, settings, and launch options apart. The launcher can install dependencies, update individual mods in place, manage Java runtimes, and apply automatic updates; worlds are preserved during updates. Existing libraries can be imported without mixing files or breaking saves. Users can choose themes, accent colors, sidebar layouts, Java versions, memory limits, and launch behavior. Refract supports multiple mod loaders and both types of modpack import. The project is licensed under GNU GPL v3.0, and its application and website are developed publicly. It uses Tauri and Rust for its native shell. Discord supports player help and project discussion, while GitHub is used for bug reports, proposals, and code contributions.

Refract brings modpack discovery, instance separation, and update tools together across desktop platforms. Its separate instances and world preservation are useful details for players maintaining multiple packs.

Refract suits Minecraft players who want to browse, import, and maintain modpacks in separate instances. It may also fit users who value publicly developed free software and configurable launcher settings.

Refract is a Minecraft launcher built for players who maintain several modded setups and want their files kept apart. It suits users who move between Modrinth, CurseForge, and FTB packs, while its open-source model will appeal to readers who prefer software they can inspect and contribute to. The main trade-off is focus: it is a strong management tool for Java modpacks, not a general game launcher.

Overview

Refract treats every modpack as an independent instance. Mods, resource packs, worlds, settings, and launch options stay with that instance, so changing one setup is less likely to disturb another. That structure matters most to players with long-running saves or several heavily customized packs.

Existing libraries can be imported without combining files or breaking saves, and worlds remain preserved through updates. Refract also brings compatible-content browsing into the launcher, reducing the need to find a pack or mod in one place and maintain it somewhere else. Its public development model and GNU GPL v3.0 license make it a clear fit for readers who value free software and an openly developed project.

The application uses Tauri and Rust for a small native shell. Community help and project conversation run through Discord, while GitHub accepts bug reports, change proposals, and code contributions; a separate discussion area handles longer questions and ideas.

Key features

• Instance isolation: Each pack gets its own mods, resource packs, worlds, settings, and launch options. This is the central benefit for anyone switching between incompatible or differently configured packs.
• Broad pack sources: Refract supports Modrinth, CurseForge, and FTB, and supports both importing modpacks and bringing existing libraries into the launcher.
• In-launcher discovery: Compatible content can be browsed from inside the application, and the launcher installs required mod dependencies. That makes setup more convenient when a pack needs supporting components.
• Update control: Automatic updates are supported, while individual mods can also be updated in place. World preservation makes the update workflow safer for established saves, though players who demand manual control over every change may prefer to review updates themselves.
• Java management: Refract manages Java runtimes and lets users choose Java versions, memory limits, and launch behavior. These controls are useful when different packs require different runtime settings.
• Personalization: Themes, accent colors, and sidebar layouts allow the interface to be adjusted without changing the underlying instance organization.

Pricing

Refract is free software under the GNU GPL v3.0. Its Free software plan has custom pricing, and no paid tier, seat allowance, quota, trial period, or renewal term is provided. For an individual player, the absence of a stated charge makes it straightforward to try; organizations that need formal commercial terms should seek pricing before adopting it broadly.

Platforms

Refract runs on Windows, macOS, and Linux. That coverage suits households or teams using different desktop operating systems, but it does not extend to mobile platforms.

Who it's for

Choose Refract if you regularly maintain multiple Minecraft modpacks, import existing installations, or want worlds and configuration kept separate by default. It is particularly well matched to open-source users who want public development and GPL licensing, and to players who appreciate built-in discovery, dependency installation, Java selection, and mod updates.

It is less compelling if you only play an unmodded installation, need a mobile launcher, or prefer a launcher whose primary purpose is simply starting the base game. Its feature set is organized around modpack maintenance, so casual users may not benefit from all of its controls.

Pros and cons

Pros

• Clean instance boundaries: Separate files, saves, settings, and launch options reduce cross-pack conflicts.
• Three major pack ecosystems: Modrinth, CurseForge, and FTB support gives pack-focused players broad coverage.
• Safer maintenance: Preserved worlds, dependency installation, automatic updates, and in-place mod updates address common upkeep tasks.
• Open development: GPL v3.0 licensing, public application and website development, and contribution channels suit community-minded users.

Cons

• Desktop only: Android and iOS users need another launcher.
• Modpack-centric design: Players who do not manage packs may find its specialized instance and runtime controls unnecessary.
• Unclear commercial terms: The Free software plan has custom pricing, so organizations cannot budget from a published figure.

Alternatives

Minecraft Launchers is the broader directory for comparing launchers. Choose LabyMod instead if you want Android or iOS support alongside desktop versions and a freemium offering. Prism Launcher is a free, redistributable open-source option for Windows, macOS, and Linux. Minecraft Launcher is the official free download across desktop and mobile, with game access tied to ownership or a time-limited demo.

Fold Craft Launcher is an Android-only GPL 3.0 open-source choice. Spectra Launcher, X Minecraft Launcher, ATLauncher, and GDLauncher are free desktop alternatives; ATLauncher requires a paid Minecraft account, while GDLauncher has no premium tier or overlay.

Verdict

Refract is a strong recommendation for desktop Minecraft players who juggle modpacks and want reliable separation, world preservation, and maintenance tools in one free, openly developed launcher. Look elsewhere if you need mobile support, a simpler unmodded-game launcher, or published commercial pricing.