App Overview

Vitamin K icon

Vitamin K

James Hollender · Medical

IMPORTANT: Before buying this app, consider the new apps that covers Vitamin K: INR Assist

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.0
10 ratings · Below Average

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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What's included16 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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

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Rork plan preview for Vitamin K: map the core Medical 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

Expand the food database by integrating with external APIs to provide a more comprehensive list.

Assumption to check: Limited food database and lack of variety

Validate with people who use this workflow before building.

Hypothesis 2

Modernize the UI with a fresh design and improved user experience.

Assumption to check: User interface feels outdated

Validate with people who use this workflow before building.

Hypothesis 3

Add advanced tracking features like graphing intake over time and reminders.

Assumption to check: Inadequate tracking features

Validate with people who use this workflow before building.

Hypothesis 4

Implement community features for users to share experiences and tips.

Assumption to check: No community features for support

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

IMPORTANT: Before buying this app, consider the new apps that covers Vitamin K: INR Assist. It provides the same functionality including creating custom foods, changing the color scale, and all items in the USDA database instead of just a select percentage. The only difference between these new apps is labeling and documentation, so you just need one. Vitamin K is one of 10 iNutrient apps based on the USDA National Nutrient Database. The others include: ◉ iCarbs (Carbohydrates) ◉ iCholesterol (Dietary Cholesterol) ◉ iFiber (Fiber) ◉ iKals (Calories) ◉ iPotassium (Potassium) ◉ iProteins (Proteins) ◉ iSatFat (Saturated Fat) ◉ iSodium (Sodium) ◉ iSugars (Sugars) Users can record their intake for any food. The information is maintained for one year and is presented in reverse chronological order grouped by day, so the latest data is presented first in the list. Editing allows for: 1) changing the number of servings; 2) changing the date; and 3) deleting records. Individual Intake Items can be copied to the current day, and all Intake Items for a single day can be copied to the current day. If you take blood thinning medications like Coumadin(R) or Warfarin, then this is an app you will truly make use of on a regular basis. "If you or a loved one is on Warfarin, this app is a fantastic resource to have on hand to know what foods are high in vitamin K. The foods are arranged alphabetically and are color-coded to help quickly identify how much vitamin K the particular food on interest contains. Highly recommended! I just wanted to thank you for including endive in your latest update, v1.2, as you said you would. This is such a great app! Thanks for making it and keeping it updated! It's such a great resource for me!" -- tsd707 The Vitamin K app provides information about foods and how they are rated for Vitamin K content. This is provided as a means to assist in deciding which foods to eat if you are using blood thinning medications such as Coumadin or Warfarin. The food servings are rated from NO Vitamin K all the way up to EXTREMELY HIGH in Vitamin K. The following colors help readily identify which is which: - Black = Rated EXTREMELY HIGH in Vitamin K (700.0 - 1146.6 mcg) - Dark Red = Rated VERY HIGH in Vitamin K (300.0 - 699.9 mcg) - Red = Rated HIGH in Vitamin K (25.0 - 299.9 mcg) - Orange = Rated MODERATELY HIGH in Vitamin K (20.0 - 24.9 mcg) - Yellow = Rated MODERATE in Vitamin K (15.0 - 19.9 mcg) - Light Green = Rated MODERATELY LOW in Vitamin K (10.0 - 14.9 msg) - Green = Rated LOW in Vitamin K (5.0 - 9.9 mcg) - Cyan = Rated VERY LOW in Vitamin K (0.1 - 4.9 mcg) - White = Rated EXTREMELY LOW in Vitamin K (0.0 mcg) There are eight tables listing foods: - ALL FOODS - Fast Foods - Fruits & Vegetables - Meat, Fish & Shellfish - Dairy & Egg - Cereal Grains & Pasta - Sweets - Snacks Meat, Fish & Shellfish includes: - Beef Products - Poultry Products - Pork Products - Sausages and Luncheon Meats - Lamb, Veal and Game Products - Finfish and Shellfish Products Fruits & Vegetables includes: - Fruits and Fruit Juices - Vegetables and Vegetable Products - Legumes and Legume Products Selecting a food in any of the tables will display pertinent information about the selected food serving: - Food Title - Weight (in grams) - Common Measure (serving size for weight) - Vitamin K Content (in mcg) - Calories - USDA Description - USDA Food Group - USDA Nutrient Database Number Information is derived from the USDA National Nutrient Database for Standard Reference: Vitamin K Content of Selected Foods per Common Measure. There are currently over 930 different foods included, searchable using approximately 2,500 names (some foods are known by different names or how they are prepared, e.g., "Egg, Fried" and "Fried Egg"). A few these have as many as six searchable names.

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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
Zustand
SQLite
React Navigation
React Native Paper
BUILD KIT DIFFICULTY
Starter

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.