I design and build humane interfaces — mostly in Swift (iOS & macOS), sometimes in Rust and Python.
My work bridges HCI research, developer tools, and new ways of working with AI.

📍 San Francisco

• Stitch — founding engineer of Stitch, an open-source tool for designers
• Chroma-Swift — Swift package for Chroma’s on-device database engine
• TiktokenSwift — Swift bindings for OpenAI’s tiktoken via UniFFI
• Roboflow Swift SDK — first SDK for running Roboflow-trained models on iOS
• AudioKit — helped launch this open-source audio synthesis/analysis framework

• Visual iMessage — what if Siri could describe images in a thread?
• Diffusion Demo — SwiftUI interfaces for Inception Labs’ model
• ASL Classifier — detecting ASL signs on-device with CoreML

• Emulating Touché — open-source capacitive sensing with plants & water
• O Soli Mio — radar-powered gestural interfaces for music
• Whistlr — contact sharing over audio on iOS
• Push-to-Talk Chat — lightweight audio chat app
• Plus experiments with BLE sensors, CoreML sound recognition, LED control, and more (archive)

• O Soli Mio: Exploring Millimeter Wave Radar for Musical Interaction (NIME 2017)
• Investigation of the use of Multi-Touch Gestures in Music Interaction (MSc Thesis, University of York)

• 🌐 Website
• 📝 Notes
• 📂 Projects
• 🐦 Twitter/X

Send me a note at nicholasarner (at) gmail (dot) com, or find me on Twitter.