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john-rocky/README.md

Daisuke Majima

Senior iOS · On-Device ML Engineer  ·  ex-Ultralytics  ·  🇯🇵 Japan  ·  Remote

Shipping LLMs and CV models that run fully on-device — iPhone · iPad · Apple Silicon Mac.
No server round-trip  ·  No per-token cost  ·  Privacy by default.

Open to roles   2-week sprint

📦 Featured

🧠 CoreML-Models — 1.7k★

The de-facto iOS Core ML model zoo. YOLO · SAM · LaMa · OCR · LLM · Stable Diffusion · depth · pose · style transfer.

🥽 RealityKit-Sampler — 176★

Runnable Apple RealityKit samples: anchors · physics · lighting · gestures · occlusion · mesh · audio.

🖼 SemanticImage — 156★

iOS image / video filter & ML utility — Vision + CoreML + AVFoundation, production-tested.

💬 CoreML-LLM — 130★

LLMs on Apple devices: CoreML · MLX · llama.cpp with quantization recipes.

🧽 lama-cleaner-iOS — 81★

iPhone / iPad on-device LaMa image-inpainting cleanup tool.

🎯 CoreML-YOLOv5 — 67★

YOLOv5 ported to iOS, with Apple Neural Engine notes.

+128 more public repos · browse all

🚢 What I do

Take AI models from "works in a notebook" to "ships as a real iOS app."

  • CoreML conversion + ANE optimization — PyTorch / HF / ONNX → CoreML / MLX / GGUF / ExecuTorch. FP16 · INT8 · 4-bit. Graph hand-tuning. KV-cache packing.
  • ARKit + LiDAR spatial pipelines — depth fusion · scene reconstruction · plane / object anchoring · RoomPlan · Vision overlay · Metal post-processing.
  • Production iOS apps — SwiftUI · UIKit · Combine · Swift Concurrency. 30 FPS LiDAR + on-device YOLO + on-device LLM. Sub-200ms recognition on iPhone 15 Pro.

🌐 Upstream contributions

swift-transformers executorch onnxruntime

📱 10 apps on the App Store

under my own developer account · apps.apple.com/developer/daisuke-majima

SnapMeasure · Models Zoo · super2x · Mask2Face · AnimateU · AIPainter · Blur. · Memosh · Tasmon · timestone

🛠 Stack

Swift SwiftUI Combine CoreML ARKit RealityKit visionOS Metal Vision MLX Python PyTorch Hugging Face ONNX TensorFlow C++ Kotlin Go TypeScript AWS Postgres

📊 GitHub

✉ Contact

📧 rockyshikoku@gmail.com  ·  🌐 john-rocky.github.io  ·  💼 LinkedIn  ·  𝕏 @JackdeS11  ·  ✍ Medium

Async-first · Plain text fine · Reply within a day

Currently solo-lead on production iOS apps combining ARKit + LiDAR + YOLOv8 + on-device OCR + on-device voice + multi-device backend sync at iPad scale. Detailed case studies under NDA.

Popular repositories Loading

  1. CoreML-Models CoreML-Models Public

    Converted CoreML Model Zoo.

    Swift 1.8k 166

  2. RealityKit-Sampler RealityKit-Sampler Public

    a sample collection of basic functions of Apple's AR framework for iOS.

    Swift 176 16

  3. SemanticImage SemanticImage Public

    A collection of easy-to-use image/video filter.

    Swift 156 27

  4. CoreML-LLM CoreML-LLM Public

    Run LLMs on Apple devices with CoreML, optimized for Apple Neural Engine + GPU

    Python 130 17

  5. lama-cleaner-iOS lama-cleaner-iOS Public

    iPhone/iPad version of lama cleaner

    Swift 81 20

  6. CoreML-YOLOv5 CoreML-YOLOv5 Public

    A sample project how to use YOLOv5 in iOS

    Swift 67 13