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Josh Frenette
As seen on the App Store

Stacked

A custom-developed iOS fitness app that stacks training, recovery, and nutrition into one daily system, with an AI coach that actually knows your numbers. Built end to end with Claude, Google, and Groq.

PLATFORMiOS · App Store
ROLEDesign · Development · AI
YEAR2026
STACKClaude · Google · Groq · RN
OVERVIEW

Everything that moves the needle, stacked in one place.

Most fitness apps track one thing. Stacked pulls training, recovery, sleep, and nutrition together, then reads across all of it. A daily readiness score sets the tone, an AI coach adjusts the plan, and logging a meal takes a sentence instead of a search.

I designed and built it end to end, custom, from the UI to the AI layer that powers coaching, insights, and macro estimation.

iOS
shipped to the App Store
3
AI providers wired in
1
daily system
THE BUILD

Custom-built, AI at the core.

Four features do the heavy lifting, each backed by a model chosen for the job.

Stack Coach

A conversational AI coach that builds and adjusts training blocks, grounded in your real numbers. Powered by Claude.

AI Snapshot

Reads 30 days across HRV, sleep, runs, and calories to surface what's actually happening, in plain language.

Macros from text

Describe a meal in a sentence and get a macro estimate back in seconds, no database scrolling.

Recipe Builder

Generates recipes with AI, then saves macros and imagery back into your own library.

AI STACK

Right model for each job.

Provider-agnostic by design, each part of the app runs on the model that fits it best.

COACHING · INSIGHTS

Claude

Stack Coach and AI Snapshot, the reasoning that reads across your data.

MULTIMODAL

Google

Vision and generation for meal photos and Recipe Builder imagery.

LOW LATENCY

Groq

Instant macro estimates and fast inference where speed matters most.

APP

React Native

One custom-built codebase, shipped to the iOS App Store.