Great question—this is a super common pain point when balancing BaaS convenience with app size constraints, especially for iOS where download limits and user frustration with bloat make every MB count. Let’s break down your practical options:

Lightweight BaaS Platforms Tailored for Games #

• Photon PUN 2: This is a go-to for lightweight real-time multiplayer. The Unity SDK is tiny (well under 5MB) and focused solely on core multiplayer needs: room creation, player matching, real-time networking, and basic state sync. It’s dead simple to integrate, has a generous free tier for small projects, and avoids the fluff of all-in-one platforms that pack in unused features like analytics or CRM tools.
• Nakama: Heroic Labs’ Nakama is built specifically for games, and its Unity SDK is remarkably lean (around 3-4MB for core functionality). It covers all multiplayer essentials: chat, matchmaker, real-time battles, and persistent player storage. Plus, it’s open-source (so you can self-host if you prefer) and offers a managed cloud option—no extra bloat, just game-focused tools.
• Supabase: While not a dedicated game BaaS, Supabase’s Unity SDK is extremely lightweight (built on REST/WebSocket APIs). If your game only needs basic backend features like user auth, real-time database sync, or file storage, you can skip heavy all-in-one platforms and use Supabase. You’ll need to build some game-specific logic (like a matchmaker) on top, but the tradeoff is minimal app size overhead.

Optimizing Existing BaaS SDKs to Cut Bloat #

If you’re set on a more popular platform like Firebase or PlayFab, you don’t have to accept the full 50MB+ footprint:

• Trim unused modules: Most BaaS SDKs are modular. For example, with Firebase, only import the packages you actually need (e.g., FirebaseAuth, FirebaseRealtimeDatabase) instead of the full Firebase bundle. This can slash the SDK size by 70% or more.
• Use REST APIs instead of full SDKs: Skip the pre-built Unity SDK entirely and use UnityWebRequest to call the BaaS’s REST endpoints. This adds almost zero extra size to your app, though you’ll have to write wrapper code for authentication, data fetching, etc. It’s more manual work, but perfect for size-sensitive projects.
• Leverage Unity’s build optimizations: Enable IL2CPP compilation with link stripping (set to "Strip unused code" in Unity’s build settings) to remove any dead code from the BaaS SDK. For iOS, enabling Bitcode can also help Apple optimize the final app size for different device models.

At the end of the day, your choice depends on how much game-specific backend logic you need. Photon PUN 2 or Nakama are the best bets for out-of-the-box lightweight multiplayer support, while Supabase or REST API calls work if you want minimal bloat and don’t mind building some custom logic.

内容的提问来源于stack exchange，提问作者Wp3Dev