HighLvl

Built on SwiftUI and Kotlin/Compose with a multi-model AI proxy and MCP, HighLvl is an AI nutrition coach for iOS and Android. It went from an idea to TestFlight in six days — and on to the App Store — with a set of AI coding agents doing the building. As designer, director, and sole operator, I set the taste and direction, not the hours in the chair.

What changed.

  • 6 days

    From a thought on Saturday to a real iOS app on TestFlight — now live on the App Store.

  • 1 operator

    One designer directing the fleet — taste and direction, not hours in the chair.

  • 3 models

    Haiku, Sonnet, and Opus blended by intent for personalized advice at the lowest cost.

  • < $5/mo

    Accessible entry tier, plus a free bring-your-own-AI path.

The HighLvl coach view on iPhone — an In 2,130 / Out 2,315 / Deficit 185 kcal summary at the top, a coach message breaking down a logged Mediterranean salad and a "Morning weight. Don't forget." nudge, logged-food cards with calorie and macro counts, and a "Tell me what you ate…" input with camera and mic.
The HighLvl daily plan on iPhone — an In / Out / Deficit summary above a 'This week' note and a 'Today's plan' that reads the prior night's 7.1h sleep, front-loads carbs around the day's workout, and sets a ~2,200 kcal target at 222g protein.
An iOS Simulator contact sheet exploring five different 'composing' states for the HighLvl coach — Typewriter ticker, Source chips, Source Sweep, Source Ledger, and Work Ledger — each logging the same lunch and showing its USDA food lookups, with a live iPhone running one of the variants in the foreground.
The HighLvl Food Log & Macros screen shown side by side in all three themes — Humble Minimalist (light), Pure Execution (dark), and Flashy (neon). Each shows the same day: a calorie ring with 1,583 kcal remaining against a 2,000 kcal goal, protein/carbs/fat bars, and a 'Today' list of logged foods (bread, ground turkey, whole eggs, egg whites) with per-item calories.
Three HighLvl settings screens on iPhone — Appearance themes and an AI provider toggle (HighLvl hosted or bring your own); a Claude Connector section with the MCP connector URL, plus Health Sources connecting Apple Health and Whoop with unit preferences; and a Nutrition Persona setting goal, coaching tone, daily calorie and deficit targets, and weigh-in date.
HighLvl marketing lockup — an iPhone showing the app's coach view beside the 'High Lvl' wordmark and the line 'Elite level nutrition tools. Without the elite level price,' on a near-black brand grid.