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
The Mushroom Book PRO
This is an extended version of the well known app - The Mushroom Book.
$2.99 · In-app purchases
PRICE
$2.99
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 The Mushroom Book PRO: 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 more detailed identification tools and community feedback.
Assumption to check: Limited identification features for mushrooms compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Add user reviews and ratings for species.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a system for regular updates and user contributions.
Assumption to check: Potential for outdated information
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free trial to entice users to try premium features.
Assumption to check: In-app purchase may deter 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
This is an extended version of the well known app - The Mushroom Book. The app is easy to use and has a unique design which will make your device even more beautiful. The included descriptions of mushrooms are concise what make them easy to assume without unnecessary information that you will never need. The content have been validated by mycologists who also suggested which photos should be picked. All that to help you enjoy the walks in the forests and protect the environment from unnecessary devastation of mushrooms that are not edible or are protected by law. • Detailed descriptions of over 107 species accompanied with photos • Supporting 4 languages such as English, German, Spanish and Polish • Long term support (updates with new species and new functionalities) • Very intuitive user interface with lovely design • Optimized for the latest iOS and the new generation of devices • Usually updated with new species „This app is amazing not only it's simple to use but has some lovely art work” „Fantastic app and a must for hardcore mushroom lovers like myself! The layout is absolutely great and graphics is super neat. And the information. The amount of information is insane. This is the app worlds best and most useful mushroom app, no question about it!”
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
TypeScript
Zustand
React Navigation
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.
