Work

Flow Recovery is an overnight HRV analysis platform for iOS. It connects to Polar H10 and Verity Sense chest straps via Bluetooth, records heart rate variability during sleep, and produces a recovery assessment using DFA α1, ln(RMSSD), and time-domain metrics scored against a 60-day rolling personal baseline.

The app uses a dual-architecture recording system — one path for overnight sessions, one for on-demand spot checks. Sleep staging runs a six-component analysis. PDF reports are generated on-device. Every line of Swift was directed by AI and validated through unit testing and hands-on QA. Twenty-four TestFlight builds across two versions, 38 beta testers, and more than 4,000 recorded sessions.

Smoke Break is a conversational AI companion for iOS and macOS designed to resist sycophancy — the tendency of AI models to agree with everything you say. It routes across five providers (Anthropic, OpenAI, Google, xAI, DeepSeek), uses a 9-position prompt assembler with bitemporal memory, and maintains a character map that evolves from conversation evidence rather than user declarations.

The voice subsystem is full-duplex with barge-in. On-device vision handles OCR, scene classification, and face counting via Apple’s Vision framework so image bytes stay local. Memory lives in SQLite (GRDB) on-device. 221 Swift files. Mac Catalyst support. No server.

ChordBook turns six wheel pickers into a live grid of guitar chord diagrams. Dial in any chord — root, quality, extension, alteration, suspension, slash bass — and the app renders every playable voicing on standard tuning, ranked by playability.

The voicing engine is brute force: it searches every fret window from the nut to the 12th fret, validates fingering constraints (≤4 fingers, barre span rules, required chord tones), and scores by position, fullness, and string coverage. No lookup table. Voicing-style filters (Open, Shell, Drop 2, Barre, Full) ensure jazz shells and songbook shapes both surface. Reverse mode identifies unknown chord shapes. PDF export of saved chord sets for printing.

Flow Conditions is a weather-aware gear recommendation engine. It fetches real-time weather from five Open-Meteo models, NWS forecasts, NWS severe weather alerts, and Apple WeatherKit, computes a median consensus, and runs a 17-step evaluation pipeline across seven environmental burden dimensions (thermal, wetness, wind, visibility, travel control, air quality, surface footing).

The output is a go/wait/avoid disposition with gear recommendations matched from your actual inventory. Push notifications for approaching rain, severe weather, morning briefings, and temperature drops. Home Screen and Lock Screen widgets. Standalone Apple Watch app with complications. Siri Shortcuts. All thresholds live in a versioned ruleset with zero hardcoded magic numbers.

Clearwire is an AI-powered news synthesis platform. Every 15 minutes it ingests articles from GDELT’s Global Knowledge Graph and 20 curated RSS feeds, clusters duplicate reports using trigram similarity with syndication network collapse, scores each cluster for civic impact and noise, and writes original wire-service-style articles by synthesizing multiple independent sources.

Articles are written natively in 21 languages across 35+ countries — not translated from English. AI model selection is tiered by civic impact (Opus for high, Sonnet for medium, Haiku for routine). Source text is extracted via Mozilla Readability and compressed through a Haiku pre-pass before the main model writes. A blindspot detector surfaces stories covered globally but absent from your country’s media.

Flow Genome Sequencer is a browser-based DNA analysis tool. Drop a raw genotype file from 23andMe, AncestryDNA, or any direct-to-consumer test, and it produces a structured health report. Everything runs client-side in JavaScript. No uploads, no servers, no tracking. The file never leaves your computer.

The Portable Certification Container (PCC) is a formal specification for deterministic JSON certification in distributed systems. JSON’s flexibility — key ordering, number formatting, Unicode escaping, duplicate keys — means the same logical data can serialize to different bytes, which makes cryptographic hashing and signing unreliable. PCC defines a complete deterministic pipeline from raw input bytes through parsing, validation, normalization, and hashing to a final certification report. The guarantee is absolute within scope: given identical inputs and identical normative artifacts, any conforming implementation produces a byte-identical report.

The pipeline runs nine phases, anchored by a single SHA-256 manifest hash that binds every normative artifact into a Merkle-like integrity chain — verification needs no network, no certificate authority, and no trusted third party. Authority is split between a prose specification and machine-verifiable JSON artifacts, and the artifacts prevail where the two conflict. Determinism is enforced by hard constraints: integer-only numbers, a strict parse gate with deterministic error precedence, a profiled JSON Schema Draft 2020-12 subset, and conformance defined as byte-identical output across a test-vector suite.

Now at version 4.0, PCC was produced through an automated iterative audit methodology — designs submitted to independent AI auditors in blind sessions, findings resolved without feature creep, repeated until convergence. The same methodology has been applied across 10+ system designs.

mattcombs.com — Nashville session musician, co-founder of The Nashville Collective. Custom site deployed on Vercel.

thegreenroomnashville.com — Recording studio. Gear list, session booking, studio photos.

bluegrass-nashville.vercel.app — Community site for Nashville’s bluegrass scene. Built in a day.

thenashvillecollective.com — Recording label and production company. Astro/React, deployed on Vercel.