App Overview

Deficit - Calorie Counter icon

Deficit - Calorie Counter

Evgenii Bykov · Health & Fitness

Track calories in 2 taps

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

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 included14 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 Deficit - Calorie Counter: 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

Incorporate social sharing and challenges.

Assumption to check: Many calorie tracking apps lack user engagement features.

Validate with people who use this workflow before building.

Hypothesis 2

Implement a barcode scanner for easy entry.

Assumption to check: Users often find it tedious to log every food item.

Validate with people who use this workflow before building.

Hypothesis 3

Allow users to set personalized goals and reminders.

Assumption to check: Limited customization on daily goals.

Validate with people who use this workflow before building.

Hypothesis 4

Simplify the subscription model and clearly explain benefits.

Assumption to check: In-app purchase models can be confusing.

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

Track calories in 2 taps. No database. No barcode scanning. No account. Just you, a number, and your goal. Deficit is the calorie tracker for people who are tired of bloated apps. No social features. No gamification. No AI photo recognition. Just intentional, focused calorie awareness that respects your time and attention. HOW IT WORKS Set your daily calorie goal Type a number, tap Add That's it Your remaining calories are always front and center. The app opens ready to log — no menus, no searching, no scrolling through food databases. FEATURES • 2-tap logging — numeric keypad appears immediately on launch • Quick-add buttons for frequent amounts (100, 200, 500 — customizable) • App icon badge shows remaining calories without opening the app • Long-press quick actions — log calories right from the home screen • Optional food labels — add a name to entries if you want, skip if you don't • Auto-reset at midnight (or your custom time) • Clean, minimal design with generous whitespace and large readable numbers WHAT WE DON'T DO • No account or sign-up required • No macro tracking • No food database to search • No barcode scanner • No streaks, badges, or gamification • No subscriptions — ever WHY DEFICIT? A caloric deficit is the fundamental mechanism of weight loss. We built an app that focuses on exactly that — nothing more, nothing less. If you want a simple, fast way to stay aware of what you eat, Deficit is for you. Start tracking in under 5 seconds. Download Deficit today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://heisen.org/deficit#privacy

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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.

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BUILD KIT DIFFICULTY
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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.