On-device AI, built into your iOS app.

I'm Cedric, a solo iOS developer with 12+ years of experience. I add on-device AI (Apple's Foundation Models, Core ML, and MLX) to your existing app without changing how it handles user data.

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About

Why on-device AI, specifically

I've spent 12+ years writing Swift and Objective-C for iOS, including years on apps used by millions of people.

Somewhere in there I ended up doing the parts of iOS work nobody volunteers for: low-level performance passes, accessibility work, the stuff that has to be exactly right because it touches every screen in the app.

That background is why on-device AI is a natural extension of what I already do, not a pivot into a trend. Core ML and Apple's Foundation Models framework aren't really "AI work" the way a cloud API integration is. They're systems work: memory, threading, model loading, and what happens when a model isn't available on an older device. That's the same category of problem I've been solving in iOS for over a decade.

I also run Metis Dev alone. When I say I built exhala from design to App Store support by myself, I mean it. There's no team to hand off to. The person who integrates the on-device AI is the same person who ships it and answers for it afterward.

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Services

What I work on

Four services, each done properly: on-device AI integration, iOS development, SwiftUI migration, and accessibility audits.

01

On-Device AI Integration

I bring Apple's on-device machine learning (the Foundation Models framework, Core ML, or MLX) into your existing app. Inference runs on the phone, so there's no per-request API cost, the feature works with no network connection, and no user data or prompts ever leave the device.

02

iOS Development

Native iPhone and iPad apps built from scratch: architecture, UI, and the unglamorous parts like background jobs and App Store submission that decide whether an app actually ships.

03

SwiftUI Migration

Move a UIKit codebase to SwiftUI a screen at a time, without freezing feature work or betting the app on a rewrite that doesn't ship.

04

Accessibility Audits

A pass through VoiceOver, Dynamic Type, and Apple's accessibility guidelines, with a specific list of what to fix, not just a score.

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Work

What I ship without a team behind me

exhala is a breathing app I designed, built, and shipped by myself: every screen, every haptic pattern, the App Store listing, the support inbox. I'm not showing it off as a product on sale. I'm showing it as evidence of what one person can take from an idea to a finished App Store release.

exhala app icon: a stylized breathing/wave symbol on a dark rounded-square background
Shipped solo, iOS

exhala

Find your calm through intentional breathing.

We breathe 20,000 times a day without thinking about it. Small changes to how we breathe can make a real difference in how we feel. Building it meant getting the design, the pacing, and the App Store logistics right without anyone else to catch what I missed.

  • Science-backed breathing exercises
  • Haptic-guided pacing so you can breathe with your eyes closed, no screen needed
  • Techniques for stress, sleep, and focus
Download on App Store
Contact

Tell me about your app

Tell me what your app does and where you want on-device AI to fit. I read every message myself and reply personally.

Prefer email? Reach me directly at hello@metisdev.com.