App Overview

B12 Deficiency icon

B12 Deficiency

B12 Info Limited · Medical

if you have been diagnosed with vitamin b12 deficiency this app will help you to keep your ‘b12 world’ organised and stress free

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.1
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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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for B12 Deficiency: 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

Incorporate quizzes and personalized recommendations.

Assumption to check: Limited user engagement due to lack of interactive content.

Validate with people who use this workflow before building.

Hypothesis 2

Simplify navigation with clearer labels and user flows.

Assumption to check: Confusing navigation structure.

Validate with people who use this workflow before building.

Hypothesis 3

Provide comprehensive explanations and visuals for each symptom.

Assumption to check: Inadequate symptom detail descriptions.

Validate with people who use this workflow before building.

Hypothesis 4

Offer additional features or content that justifies the subscription cost.

Assumption to check: Subscription model may not provide enough value.

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

if you have been diagnosed with vitamin b12 deficiency this app will help you to keep your ‘b12 world’ organised and stress free. it will help you evaluate your condition accurately and build an important record of how b12 deficiency affects you on a day to day basis. this app will help to demonstrate to your doctor how well you are responding to treatment. use the handy tools to chart your symptoms (symptom list provided with kind permission of sally m. pacholok r.n. & dr. jeffrey j. stuart, authors of 'could it be b12 an epidemic of misdiagnoses?'), injections, supplements and medications and track improvements or regression in your health. you can print your charts directly from the app. is your memory affected by b12 deficiency? many of us have memory problems caused by the condition. we might forget appointments or when to take our medications and supplements. reduce anxiety and become organised by setting this app to give you handy reminders and alerts. • my symptoms - use the slider bar to record the severity of your symptoms. once entered and graded your results appear in graph form, alongside your supplements and medications. • my supplement/medications - organise and manage your injections, medications and supplements. let the app remind you when to take your dosage. • my calendar - click any date to view doses for that day. keep your current supplements/medication and appointments scheduled at your fingertips. • my charts - choose up to four symptoms and medications to view at one time, and the graph will display improvements or regression. you can print them directly from the app. • my journal - record your observations and keep notes. say how you feel! • my test results - keep your important test results accessible, and monitor changes over time. • my medical history - record key information regarding your b12 deficiency and any other conditions you have. • my appointments - the app will remind you of your scheduled appointments. • my images - the camera never lies! build and organise a personal image library of your visible symptoms to record your b12 history. please note: the information on this app is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. this app is for informational purposes only. always consult your health care provider regarding specific medical questions or concerns.

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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
React Navigation
Axios
React Query
TypeScript
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.