SMAPI vs UE4SS

SMAPI8.9Visit UE4SS8.4Visit

Higher score SMAPI #3 in Game Mod Loaders 8.9/10 Free plan Free plan✓ 4 of 4 features Visit SMAPI

vs

UE4SS #6 in Game Mod Loaders 8.4/10 Open source ✓ 1 of 4 features Visit UE4SS

• SMAPI fits best

  Stardew Valley modding

• UE4SS fits best

  Unreal Engine game modding

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Side by side

Feature	SMAPI 8.9/10 Visit ↗	UE4SS 8.4/10 Visit ↗
At a glance
Editor score	8.9	8.4
Ranking	#3 in Game Mod Loaders	#6 in Game Mod Loaders
Best for	Stardew Valley modding	Unreal Engine game modding
Pricing model	Free	Free
Starting price	Free plan	Open source
Free plan	✓ (best)	Not checked yet
Free trial	—	—
Deployment	Desktop, Mobile	Desktop
Platforms	Windows, macOS, Linux, Android	Windows
Support	Community, Docs	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features SMAPI 4/4 · UE4SS 1/4
Plugin support	✓ (best)	Not checked yet
Load-order control	✓	✓
Mod profiles	✓ (best)	Not checked yet
Dependency handling	✓ (best)	Not checked yet
Specs
Supported games	Stardew Valley	Not checked yet
Supported platforms	Linux, macOS, Windows, Steam Deck, Android	Windows
Mod loading method	Plugin	Injection
Our review
Pros	Free and open source with plugin and API support Compatibility checks, update detection, and mod diagnostics Save backups, profiles, load-order control, and dependencies	Lua and C++ APIs support script-based and native mods Blueprint loading, actor spawning, and live property editing Automatic or manual injection with configurable mod ordering
Cons	Supports Stardew Valley rather than multiple games Android installation follows separate guidance Its feature set is focused on mod loading and related tooling	Windows is the published supported platform Injection requires installation alongside a game executable The broad Unreal Engine scope may require game-specific compatibility checks
Our verdict	SMAPI is an open-source mod loader and API for Stardew Valley, intended for players and mod creators. It launches the game with mod support, loads code mods and content packs, and provides APIs and events for plugins. Support covers… Read the review →	UE4SS is an open-source modding system for Unreal Engine 4 and 5 games, aimed at players and developers who want to load, create, or debug mods on Windows. It injects into supported game processes and combines Lua scripting with a C++… Read the review →

Strengths and trade-offs

• SMAPI — where it wins

  • Free and open source with plugin and API support
  • Compatibility checks, update detection, and mod diagnostics
  • Save backups, profiles, load-order control, and dependencies

  Where it doesn't

  • Supports Stardew Valley rather than multiple games
  • Android installation follows separate guidance
  • Its feature set is focused on mod loading and related tooling

• UE4SS — where it wins

  • Lua and C++ APIs support script-based and native mods
  • Blueprint loading, actor spawning, and live property editing
  • Automatic or manual injection with configurable mod ordering

  Where it doesn't

  • Windows is the published supported platform
  • Injection requires installation alongside a game executable
  • The broad Unreal Engine scope may require game-specific compatibility checks

• SMAPI8.9/10 · Free plan

  A capable, free loader for Stardew Valley mods, diagnostics, dependencies, and save backups.

  Visit SMAPIFull verdict →
• UE4SS8.4/10 · Open source

  A deep Unreal Engine mod loader for Windows modders and developers.

  Visit UE4SSFull verdict →