HReactor

What is HReactor?

HReactor is a Fabric and Forge modpack for Minecraft 1.20.1, published by LunarVeil on Modrinth since 2025.

The latest release, 26.8.4 from Aug 4, 2026, declares 26 mods. Across 5 published versions it has covered Minecraft 1.20.1 through 26.2.

With 72K downloads it ranks #253 of the 518 most-downloaded Modrinth modpacks we track, and its authors tag it as lightweight and optimization.

• Lightweight
• Optimization

Most widely used mods in HReactor

The latest version declares 26 projects. The ones below appear in the most packs we track.

• Cloth Config API
• ModernFix
• Resourceful Config
• Memory Leak Fix
• Structure Layout Optimizer
• Log Begone
• Async Logger
• quick pack
• Immersive Optimization
• Modern UI
• Placebo
• Cull Less Leaves Reforged
• Async Locator
• Faster Iris Shadow Mapper [FISM]
• Jasione
• 0Pack2Reload
• Kerria
• EfficientHashing
• TT20 (TPS Fixer)
• CLab
• Cullify
• GpuShift
• MCreatorMemFix
• MemGuard

Full HReactor mod list

18 more files are bundled inside the pack without a Modrinth project, so we cannot name them.

How its mod list compares

Less common picks: 8 mods found in five or fewer tracked packs.

• CLab
• Cullify
• GpuShift
• MCreatorMemFix
• MemGuard
• Noisiumed
• Tpsum
• TT20 (TPS Fixer)

Packs with the most mods in common

• [UO]Ultramodern optimization Forge / NeoForge for 1.20.1 6 mods in common
• [BRE] Block Railway Engineering: MTR, Create, IR and more! Fabric / Forge / NeoForge / Quilt for 1.20.1 10 mods in common
• Shaders - Working Fabric for 26.2 5 mods in common
• Additive Fabric / Quilt for 26.2 5 mods in common
• TRACING LIGHT · DARK TIDE Forge for 1.20.1 5 mods in common

What kinds of mods are in HReactor?

Of its 26 mods, 22 are tagged optimization, 9 utility and 5 library. Mods can carry several tags, so the counts overlap.

At 85% optimization, that is a larger share than 99% of the 491 packs we track.

• optimization: 22 (85%)
• utility: 9 (35%)
• library: 5 (19%)
• management: 1 (4%)

How big is HReactor?

With 26 mods, HReactor has fewer mods than 77% of the 491 packs we track and fewer mods than 86% of the 147 on Minecraft 1.20.1.

The pack file is 7.7 MB. 8 mods are client-only and 18 also run on a server. It declares no resource packs or shaders.

How actively is HReactor updated?

HReactor was first published on Jul 20, 2025, and has 5 published versions in total.

The latest release, 26.8.4, is dated Aug 4, 2026, 99 days before our data was fetched on Nov 11, 2026. Releases have covered 4 Minecraft versions over 1 years.

Staple mods HReactor includes and leaves out

Across the 325 Fabric packs we track, 15 mods turn up most often. HReactor includes 1 of them; it leaves out Fabric API, Sodium, Mod Menu, Lithium, FerriteCore, Entity Culling, Iris Shaders, Fabric Language Kotlin, ImmediatelyFast, YetAnotherConfigLib (YACL), Sodium Extra, Reese's Sodium Options, Text Placeholder API and Architectury API.

How much RAM does HReactor need?

HReactor needs 4 GB allocated (2 GB minimum). Our estimate from the 26-mod list, not measured.

How to set allocated memory

How to install HReactor

Search for "HReactor" in the Modrinth source of your launcher. Pick version 26.8.4 for Minecraft 1.20.1 (Fabric and Forge). Modpack install guide.

How do I make a HReactor server?

HReactor is marked as needing a server-side install, so the server must run the same mods and version as the players.

• Match the version: the latest pack version is 26.8.4 for Minecraft 1.20.1.
• Loader: Fabric and Forge.
• Memory: at least 2 GB (our estimate).

Modpack server guide.

Versions

Newest build for each of 4 Minecraft version and loader pairs.

Official links

• HReactor on Modrinth (downloads and changelog)

Facts on this page come from Modrinth's public API, last fetched Nov 11, 2026. Descriptive text is our own. Spotted an error, or are you the author and want something changed? See disclaimer and takedowns.