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
Juice Master One
THE ULTIMATE JUICING APP FROM BEST-SELLING AUTHOR JASON VALE.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.8
8 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included18 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 Juice Master One: 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
Expand recipe database to include diverse juice options.
Assumption to check: Limited recipe variety compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Standardize UI components for a cohesive experience.
Assumption to check: Inconsistent user interface elements
Validate with people who use this workflow before building.
Hypothesis 3
Enhance nutritional details with easy-to-access sections.
Assumption to check: Difficulty in finding nutritional information
Validate with people who use this workflow before building.
Hypothesis 4
Implement social sharing and user-generated content features.
Assumption to check: Low user engagement due to lack of community features
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 ULTIMATE JUICING APP FROM BEST-SELLING AUTHOR JASON VALE. Unlock the power of health with Juice Master One, the definitive juicing app! With over 25 years of juicy expertise, Jason brings you the ultimate one-stop destination for his life-changing juice cleanses. OVER 1.5 MILLION JUICE MASTER APPS SOLD AND COUNTING! App Features: - ALL of Jason’s Juice Cleanses in one place. - FREE 10-Day Breakfast Challenge for all app users - Daily/weekly coaching. - Tailor your health journey with the 'Design your own diet' feature. - Over 250 Recipes, including juices, smoothies, blends, soups, and whole-food meals - Autogenerated shopping lists for all cleanses - Record your stats and track your results. - Stay motivated with exclusive ‘Life After The Cleanse' audio from Jason providing top tips for maintaining a healthy lifestyle beyond the cleanse. - More recipes added through the year! DOWNLOAD for FREE and take a look around. Get full 365-day access for less than £1 a week! A LITTLE NOTE FROM JASON "I know first-hand that committing to a well-thought-through, nutritionally balanced juice cleanse can be a catalyst for incredible improvements to your health. This is why I am so excited to bring you every single tried and tested juice, blend, food, and soup cleanse I’ve ever done (and so much more) as part of this app and to be able to guide you through your own juicy journey. I can’t wait to hear your results!“ — JASON VALE http://www.apple.com/legal/itunes/appstore/dev/stdeula
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
Supabase
React Navigation
Axios
Zustand
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.
