App Overview

One Life Diet icon

One Life Diet

One Life Diet Inc · Health & Fitness

The One Life Diet app will transform the way you track calories

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.5
4 ratings · Top 50%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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A product spec, screen plans, and build steps for your coding agent.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for One Life Diet: map the core Health & Fitness workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Enhance meal search with extensive food database integration.

Assumption to check: Limited food database for searching meals

Validate with people who use this workflow before building.

Hypothesis 2

Simplify UI for easier navigation and meal logging.

Assumption to check: User interface is cluttered

Validate with people who use this workflow before building.

Hypothesis 3

Incorporate social sharing and challenges to engage users.

Assumption to check: Lack of social features

Validate with people who use this workflow before building.

Hypothesis 4

Optimize app performance for a wider range of devices.

Assumption to check: Inconsistent performance on older devices

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

The One Life Diet app will transform the way you track calories. Not only will its unique and innovative system speed up your weight loss, it will also dramatically simplify the process. WHY NOT JUST COUNT CALORIES? To put it bluntly, the old-school belief that “a calorie is a calorie” is simply wrong. The reality is, carbohydrates cause you to gain weight faster than proteins or fats. When you treat all calories as equal, your weight loss is often not going to seem to make any sense – because your expectations are based on incorrect information. And if your diet is based on the belief that all calories are the same, it is going to make losing weight harder and slower than it should be. THE ONE LIFE BLOCK SYSTEM One Life’s Block System for counting calories is completely different from any other calorie counting app available. Using a proprietary system created by Jonathan Haynes, MD, the creator of THE ONE LIFE DIET, the One Life app assigns a Block count to each food based on its ratio of carbohydrates and calories to its protein, fat, and fiber content as well as the food's ability to satisfy hunger and to keep you full. The One Life Diet app allows you to accurately assess the true impact of a food on your weight, which allows you to make choices that will truly create weight loss. And when you can do that, weight loss stops feeling like a mystery and finally starts to make sense. CALORIE COUNTING MADE EASY Calorie counting is so inherently cumbersome, even with a great app it’s still a hassle. Calorie counting requires you to memorize two variables for every food: the serving size + the calorie count for that serving. One Life’s Block System greatly simplifies the process. We’ve categorized every food into one Block serving sizes, which means you only need to remember a single variable for each food – its serving size. Not to mention keeping track of 20 Blocks is a lot easier than trying to keep track of 1200 calories. WHAT CAN YOU DO WITH IT? Quickly and easily search the Block count of your food no matter where you are. Easily compare the Blocks of different foods to help you make better choices. Create and save your own custom foods to quickly access later. Make a personalized “favorites” list for quick and simple journaling. Search for “Free Foods” and “Carb-Free” options. Use the “quick add” feature to add Blocks when you don’t have time for the details. Track your daily exercise and your water intake. Automatically adds up your Blocks as you go. Tracks and automatically graphs your weight loss. Keep notes of your day to provide insight into your weight loss successes and failures. View your journal entries by the day, the week, or by custom dates. Easily print and email your food journal to others. PURPOSEFULLY LIMITED We don’t have the “3,000,000 food database” the other apps boast about. We aren’t trying to be an encyclopedia. What we want to be is a guide for the food you actually eat, and not the 2,999,000 that you don’t.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Supabase
react-navigation
react-native-chart-kit
expo-linear-gradient
BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.