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.
App Overview
Jason Vale’s 5-Day Juice Diet
OVER 1 MILLION JASON VALE APPS HAVE NOW BEEN SOLD!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
11 ratings · Top 15%
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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Jason Vale’s 5-Day Juice Diet: map the core Food & Drink 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
Include user-generated recipes and community ratings.
Assumption to check: Limited variety of juice recipes.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their juice diet based on preferences.
Assumption to check: Lack of personalization in juice plans.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate nutritional tracking for better user engagement.
Assumption to check: No tracking of nutritional intake.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a freemium model with more accessible pricing options.
Assumption to check: High subscription cost for some users.
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
OVER 1 MILLION JASON VALE APPS HAVE NOW BEEN SOLD! LOSE UP TO 5LBS IN 5 DAYS and recharge your body and mind without restricting what you can eat or drink at the weekend. Jason Vale's 5-Day Juice Diet app is a fresh approach to juicing and the ultimate guide to kickstarting rapid, healthy weight loss, boosting energy levels and maintaining optimum health. The 5-Day Juice Diet app brings to life Jason Vale's easiest and most effective juice plan book – 5lbs in 5 Days (aka the 5-Day Juice Challenge) - and features everything you need to breeze through the plan, including: - The complete 5-Day Juice Diet plan. - Delicious juice, smoothie & shot recipes (some with videos). - Jason's tips for success. - Daily coaching videos from Jason. - Auto-generated shopping list function. - 'Life After the Plan' audio from Jason. - Reminder alerts. ***** "I lost 6lbs and feel amazing!" JESSICA M ***** "I am 58 years old and feel better than I have ever felt. Lots of energy, skin feels soft!" TINA B ABOUT JASON! Jason Vale, also known as the 'Juice Master', has sold over 6 million books, over 1 million apps, made a movie (Super Juice Me!), opened a few health retreats (www.juicemasterretreats.com) and been on a mission to Juice the World for over 20 years! "When it comes to juicing, there's only one man for the job." CAROL VORDERMAN "The King of Juicing." ALESHA DIXON “Jason Vale's approach is all about taking control of your health using common sense and logic. Always delivered with his unique humour and most importantly, easy to apply to your own life.” BEVERLY KNIGHT
Written user reviews are not shown here. Check current App Store reviews >
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
Axios
React Navigation
Typescript
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.
