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Get startedCactus vs MLC LLM: Hybrid Inference vs Compiled Model Deployment
Cactus provides hybrid AI inference with automatic cloud fallback across LLMs, transcription, vision, and embeddings. MLC LLM uses Apache TVM to compile models for native execution on any hardware target including phones, desktops, and browsers. Both support mobile deployment but take fundamentally different approaches to optimization.
Cactus
Cactus is a hybrid AI inference engine for mobile, desktop, and edge hardware. It provides a unified API for LLMs, transcription, vision, and embeddings with automatic cloud fallback. Cactus supports sub-120ms latency, NPU acceleration, and native SDKs for Swift, Kotlin, Flutter, React Native, Python, C++, and Rust.
MLC LLM
MLC LLM is a machine learning compilation framework that compiles large language models to run natively on any hardware target. Built on Apache TVM, it optimizes models for specific hardware backends including Metal, Vulkan, OpenCL, and WebGPU. MLC LLM enables browser-based LLM inference, a unique capability among on-device solutions.
Feature comparison
Performance & Latency
MLC LLM compiles models to native code for each hardware target, enabling hardware-specific optimizations that can yield excellent performance. Cactus uses zero-copy memory mapping and INT4/INT8 quantization for sub-120ms latency. MLC LLM's compilation approach can produce faster raw inference on specific hardware, while Cactus's hybrid routing ensures consistent quality.
Model Support
MLC LLM focuses on language models and VLMs through its compilation pipeline. Cactus covers LLMs, transcription (Whisper, Moonshine, Parakeet), vision (Gemma 4 multimodal), and embeddings (Nomic Embed). MLC LLM requires a compilation step for each model-hardware combination, while Cactus loads models more directly. Cactus has broader modality coverage.
Platform Coverage
MLC LLM stands out by supporting web browsers via WebGPU in addition to iOS, Android, macOS, and Linux. Cactus covers iOS, Android, macOS, Linux, watchOS, and tvOS but does not support browser-based inference. Both have strong mobile support, with MLC LLM offering a unique browser deployment option.
Pricing & Licensing
MLC LLM is Apache 2.0 licensed and completely free. Cactus is MIT licensed with an optional paid cloud API for hybrid routing. Both are permissive open-source licenses suitable for commercial use. Teams not needing cloud fallback pay nothing for either solution.
Developer Experience
MLC LLM has a steeper learning curve due to the compilation workflow. You must compile each model for each target platform using TVM. Cactus offers a simpler integration path with native SDKs and pre-optimized model loading. For teams that need browser deployment, MLC LLM's compilation step is worth it. For mobile-first teams, Cactus is more straightforward.
Strengths & limitations
Cactus
Strengths
- Hybrid routing automatically falls back to cloud when on-device confidence is low
- Single unified API across LLM, transcription, vision, and embeddings
- Sub-120ms on-device latency with zero-copy memory mapping
- Cross-platform SDKs for Swift, Kotlin, Flutter, React Native, Python, C++, and Rust
- NPU acceleration on Apple devices for significantly faster inference
- Up to 5x cost savings on hybrid inference compared to cloud-only
Limitations
- Newer project compared to established frameworks like TensorFlow Lite
- Qualcomm and MediaTek NPU support still in development
- Cloud fallback requires API key configuration
MLC LLM
Strengths
- Compiles models to run natively on any hardware target
- Excellent mobile performance with hardware-specific optimization
- WebGPU support enables browser-based inference
- Strong academic backing and research community
Limitations
- No transcription or speech model support
- No hybrid cloud routing
- Compilation step adds complexity to the workflow
- Steeper learning curve than llama.cpp
The Verdict
Choose MLC LLM if you need browser-based inference via WebGPU, want hardware-specific compilation optimizations, or are comfortable with the TVM compilation workflow. Choose Cactus if you need multi-modal support beyond LLMs, hybrid cloud routing, or faster integration via native SDKs. MLC LLM excels at hardware-specific optimization; Cactus excels at breadth and developer simplicity.
Frequently asked questions
Can MLC LLM run models in a web browser?+
Yes. MLC LLM can compile models to run in browsers via WebGPU, enabling client-side LLM inference without a server. This is a unique capability that Cactus does not currently offer.
Is MLC LLM harder to set up than Cactus?+
Generally yes. MLC LLM requires compiling models through the TVM pipeline for each target hardware. Cactus offers pre-optimized model loading through native SDKs, making initial setup faster for most developers.
Does MLC LLM support transcription or speech?+
No. MLC LLM focuses on language model and VLM inference. For transcription you need a separate tool. Cactus supports Whisper, Moonshine, and Parakeet transcription models natively.
Which is better for iOS development?+
Both support iOS. MLC LLM provides Metal-optimized compiled models. Cactus offers a native Swift SDK with NPU acceleration. For iOS LLM inference, both are strong. Cactus adds transcription and vision in the same SDK.
Does MLC LLM have hybrid cloud fallback?+
No. MLC LLM is purely on-device. If the local model cannot handle a request, there is no built-in fallback. Cactus automatically routes to the cloud when on-device confidence is low.
Which has better NPU acceleration?+
MLC LLM leverages TVM's hardware backends which can target various accelerators. Cactus supports Apple Neural Engine with Qualcomm NPU planned. MLC LLM's compilation approach can theoretically target more hardware accelerators.
Try Cactus today
On-device AI inference with automatic cloud fallback. One unified API for LLMs, transcription, vision, and embeddings across every platform.