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👋 Passionate about accessible apps and games. I'm an iOS engineer at the fintech Empower.

Current open-source hobby projects

  • Muggle (TestFlight) — macOS menu bar app for Ember Bluetooth smart mugs.
  • Colors We Can See (TestFlight) — Filters your camera feed with Metal color blindness shaders. Explores the latest Composable Architecture beta before a larger coffee-related payments project.

Past apps / fun libraries

  • Oklab — A perceptual LAB color space useful for smooth gradients and parallel manipulations
  • SeedFi — Modular Composable Architecture + SwiftUI for consumer credit building and lending
  • MetaWear — Metal and SwiftUI for exploring BLE IMU sensor data during development
  • MetaWear Swift Combine SDK — Stream BLE sensor data
  • MetaBase — Collect BLE IMU sensor data in research studies
Metabase.5.Quick.Clickthrough.mov

Past hobby apps

WCAG Shades     iOS — UIKit, Metal
Filters your camera feed of pixels failing WCAG
color contrast tests as a visual learning aid

Inclusivity     macOS — AppKit, Combine, SwiftUI
Accessibility tests app color schemes from .xcassets
across color blindness simulations and appearances

Inclusivity.Walkthrough.mp4

Ryan Ferrell's Projects

colors-we-see icon colors-we-see

Simulates color blindness on your camera feed using Metal filters.

ember-mug icon ember-mug

Reverse engineered bluetooth protocol for Ember Mugs

inclusivecolor icon inclusivecolor

Unit test color and text contrast problems for typical and color blind vision

jwt-kit icon jwt-kit

🔑 JSON Web Token signing and verification (HMAC, RSA, ECDSA) using BoringSSL.

muggle icon muggle

Muggle is an open source, privacy-friendly alternative to apps by Bluetooth smart mug manufacturers.

oklab icon oklab

Björn Ottosson's Oklab perceptual color space in Swift

swift-custom-dump icon swift-custom-dump

A collection of tools for debugging, diffing, and testing your application's data structures.

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