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How Meep stacks up.

Meep is pinned. Pick up to two more engines to compare against. Sections cover web deployment, performance, architecture, graphics, AI tooling, workflow, licensing, and distribution targets.

Claims are evaluated against each engine's production web build — what actually ships in a browser today. Experimental backends are treated as not supported: if a feature only runs in a vendor-flagged experimental target, we mark the row as unavailable. Cross-compiled engines lose a lot of their native feature set in the WebGL 2 (GLES 3.0) translation; we mark those rows accordingly.

Pinned: Meep. Pick up to 2 more.

Web deployment

How the engine reaches a browser, and what that costs you in shipping size, startup time, and integration with the rest of your web stack.

	Meep Web-native	Unity Cross-compiled
Runtime architecture	Native JavaScript Runs in the browser as JS; no cross-compile step.	C# → IL2CPP → WASM ¹¹ Cross-compiled. Game logic runs as WebAssembly, not native JS.
Minimal bundle size ⓘ	~150 KB ^{1 ,2}	~5–15 MB ¹² Compressed minimum for a near-empty build.
Tree-shaking ⓘ	✓ ² Per-file ES modules, dead code drops cleanly.	◐ Code stripping at build, but the runtime is monolithic.
Asset streaming ⓘ	✓ AssetManager streams lazily by URL.	✓ Addressables system; requires explicit setup.
HTML / CSS / JS interop ⓘ	Native Game is a JS module; share the DOM, CSS, fetch, anything.	Bridged JS↔C# via SendMessage / .jslib — not native cohabitation.
Native browser DevTools ⓘ	Full Set breakpoints in gameplay code, inspect entities in Sources.	Limited Source maps land in IL2CPP-emitted C++, not your C#.
Mobile web	✓	◐ Runs, but bundle and memory are heavy for mobile browsers.

Performance

What the engine can hold on screen and how steady the frame budget stays.

	Meep Web-native	Unity Cross-compiled
Engine start after download ⓘ	< 200 ms ³ From bundle-loaded to first frame, on commodity hardware.	Several seconds WebAssembly compile + heap warmup + initial scene load on top of the multi-MB download.
Entity capacity at 60 FPS ⓘ	1,000,000 ⁴ Verified at 60 FPS in the live demo.	~10K – 30K ¹³ Classic GameObject path; Entities ECS data layout compiles to WebGL but the Burst + Jobs multipliers that drive DOTS native numbers don't transfer.
GC-free architecture ⓘ	✓ Zero per-frame allocations across the core loop.	✗ ¹³ Mono runtime garbage-collects per frame on the WebGL target. The DOTS GC-light story relies on Burst, which doesn't deliver its native gains on web.
Idle memory footprint	~20 MB	~150 MB+
Concurrency model ⓘ	Cooperative task system ⁵ ConcurrentExecutor time-slices tasks with explicit dependencies. Workers optional, not required.	✗ ^{13 ,14} Jobs require Wasm threads (SharedArrayBuffer + COI) and Burst on WebGL is experimental. Treating experimental as not supported, the production web build is effectively main-thread.

Architecture

The shape of the codebase you'll work in day to day.

	Meep Web-native	Unity Cross-compiled
Core pattern	Pure ECS One component per type per entity; queries are flat-array scans.	OOP (GameObject) ¹³ GameObject/Component is the default. The DOTS ECS path runs on WebGL but without the Burst + Jobs perf gains it's a costlier rewrite for little web benefit.
Scene format	Binary + JSON, versioned ⁶ First-class serialization with format-version reconciliation. User components are extensible via serialization adapters.	.scene / .prefab Binary-leaning YAML scene files.
Editor model	Code-first No GUI editor required; edit code, not opaque scene files.	GUI-required Most workflows assume the Unity Editor.
Engine source access	Yes Full source ships in the npm package — no binary blobs.	Subscription tier Reference source available; modification requires special agreement.

Graphics

Render-side features bundled in the box.

	Meep Web-native	Unity Cross-compiled
3D rendering	✓	✓
2D rendering	✓	✓ Strong 2D toolset (Tilemap, Sprite Atlas, 2D physics).
Many-light pipeline ⓘ	Forward+ Clustered, thousands of dynamic lights.	URP only on web ¹⁴ Forward+ relies on structured buffers / compute, both absent on WebGL 2. URP forward is the practical web ceiling.
PBR materials	✓	✓
Lightprobe GI + baking ⓘ	✓ Sparse lightprobe GI with built-in baker.	◐ ¹⁴ Editor-baked lightmaps and light probes ship to the web target; real-time GI techniques do not.
Virtual textures + pipeline ⓘ	✓ Engine-native VT format with PNG → VT conversion tooling.	✗ ¹⁴ Streaming Virtual Texturing is HDRP-only, and HDRP does not run on WebGL.
Decals	1M+ GPU-driven Decals are first-class entities, batched on the GPU.	Limited URP screen-space decals work on web; HDRP decal projectors do not.
Particle system	✓ Compiled into 4 shaders; no per-emitter state switching.	◐ ¹⁴ Shuriken (CPU) works; VFX Graph (GPU) requires compute and is unavailable on WebGL.
Post-processing	✓	✓ URP post stack works; some compute-based effects don't.
Offline path tracer ⓘ	✓ ⁷ Pure-JS, runs offline in a worker.	✗ HDRP-only feature, not present on the web target.

Logic & AI

Decision-making and spatial-reasoning toolkits that come with the engine.

	Meep Web-native	Unity Cross-compiled
Behavior trees	✓ Behavior trees with blackboards.	✗ Asset Store plugins (Behavior Designer, Opsive). Not in the box.
Grid pathfinding	✓ Grid A* over flat Uint8Array obstacle fields.	✗ Plugins on Asset Store.
Navmesh pathfinding	✓ Built-in navmesh builder + runtime pathfinder — rare outside AAA engines.	✓ Built-in NavMesh, NavMeshAgent.
MCTS / search algorithms ⓘ	✓ Monte-Carlo Tree Search built in — see the chess example.	✗ Not provided; write your own.
Inverse kinematics	✓ FABRIK inverse kinematics.	◐ Animation Rigging package; not a fully general IK toolkit.
Physics	Built-in ⁸ Deterministic rigid-body engine with joints & constraints — bit-exact across V8, pure JS. Plus GJK collision queries.	✓ PhysX (3D), Box2D (2D).
Fluid simulation ⓘ	Built-in (grid + MPM) ⁹ Eulerian MAC-grid solver with ECS volumes, effectors, and a world-space sampling API; separate MLS-MPM solver for free-surface material.	✗ No built-in volumetric fluid solver; third-party assets or custom compute.
BVH spatial queries	✓ Scene BVH for broad-phase queries and raycasts.	✓ Internal broad-phase via PhysX.

Audio

What the engine offers between "play this file" and shipping-grade game audio.

	Meep Web-native	Unity Cross-compiled
Spatial 3D audio ⓘ	✓ ¹⁰ HRTF or equal-power panning, curve-driven attenuation, voice virtualization; ~100k registered emitters via a live/dormant budget.	✓ Built-in 3D audio sources; HRTF via spatializer plugins.
Event & mixer system ⓘ	Built-in ¹⁰ Events with sequence/random/switch/blend containers, bus tree with effects & sends, live parameters, snapshots, ducking — plain serializable engine data, deterministic under lockstep.	Audio Mixer Mixer with snapshots, ducking, and exposed parameters; no event/clip-container layer in the box — teams typically add middleware.

Workflow

How code lives, how fast iteration is, how you extend the engine.

	Meep Web-native	Unity Cross-compiled
Primary language	JavaScript	C#
Static typing	TypeScript via JSDoc .d.ts files emitted by the build for TS consumers.	✓ Statically typed C#.
Hot reload	✓ Standard Vite HMR — no engine-specific reload dance.	Limited Domain reload is slow; hot-reload tooling is third-party.
Module granularity ⓘ	~3,000 modules ² Fine-grained; pull only what you reference.	Monolithic The runtime ships as one bundle; you don't import individual subsystems.

Licensing & cost

How the engine is licensed and what gets billed.

	Meep Web-native	Unity Cross-compiled
License	Proprietary, source-available	Proprietary
Pricing model	One-time per project	Per-seat subscription (Pro / Enterprise) above the Personal threshold ¹⁵
Runtime royalty	✗ No per-install, per-seat, or per-revenue runtime fee.	✗ ¹⁶ The 2023 Runtime Fee was retracted in 2024.
Source available to licensees	✓ Full source ships in the npm package for every tier.	◐ Read-only reference source via subscription tiers.
Revenue / funding gate	Funding-based Free under $50K funding & rev; Indie under $200K; Standard under $2M.	$200K revenue / funding ¹⁵ Personal tier ceiling; Pro+ required above.

Distribution targets

Where finished products can ship.

	Meep Web-native	Unity Cross-compiled
Web	Native The home target — runs in the browser without a cross-compiler.	Cross-compiled (WASM) ¹¹
Desktop	Wrap (Electron / Tauri) Ship as a web app inside a desktop shell.	Native
Mobile	Wrap (Capacitor / WebView)	Native
Console	✗	✓ PlayStation, Xbox, Switch (via certified partner programs).

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