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
FermentApp
Hands-on crash course for homemade Ferments & Pickles.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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 included17 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 FermentApp: 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
Implement social sharing options to allow users to share recipes easily.
Assumption to check: Limited recipe sharing features
Validate with people who use this workflow before building.
Hypothesis 2
Enable users to submit and rate their own recipes.
Assumption to check: Lack of user-generated content
Validate with people who use this workflow before building.
Hypothesis 3
Add advanced filtering and sorting options for better usability.
Assumption to check: Difficult navigation in large recipe collections
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to convert recipes into shopping lists for easier shopping.
Assumption to check: No integration with shopping lists
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
Hands-on crash course for homemade Ferments & Pickles. FermentApp is the ultimate app to learn fermentation and pickling techniques from scratch and at your own pace: - 10 lessons with all the theory on veggie lactofermentation fundamentals, beautifully illustrated. You can also listen to the lessons while doing other stuff as they're also available in audio format. More than two hours of fun and rigorous content. - 16 guided recipes, step by step, with alerts and notifications that will guide you through the whole process. Recipes are in order of difficulty, so we'll start with easy recipes and we'll end up making our own kimchi, our graduation recipe. All the recipes are vegan or have a vegan option. And with more recipes coming soon! All the content is available in English and Spanish. Lesson index: 1. Course introduction 2. Why fermenting? 3. Fermentation technique 4. Pickling technique 5. Hygiene and cleanliness 6. Best practices 7. Problem solving 8. Recommended tools 9. Fermentation decalog 10. Bibliography and references Recipe index (more recipes will be published in the next months): 1. Quick pickles 2. Sauerkraut 3. Avocado pickles 4. Sourdough 5. Preserved lemons 6. Red sauerkraut 7. Vietnamese pickles 8. Sima 9. Ginger bug 10. Giardiniera (Chicago Style) 11. Fermented salsa 12. Tepache 13. Fermented mustard 14. Kvass 15. Ginger ale 16. Kimchi FUTURE PLANS This course, like our ferments, is alive! Here is the open roadmap for the app. If you have any suggestion, we want to hear from you: - Continuous lesson updates and additional content. - New seasonal and extra recipes included in the course. - Newsletter service for FermentApp users. - Optional expansion packs with new courses covering specific topics: koji, vinegars, milk, vegan cheeses, regional ferments and pickles, drinks... - Collaborations with chefs and experts to cover new content tracks. - User profile and community tools. - Recipe customisation to create your own variants. - Personal cookbooks: create and publish your own recipes.
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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
Supabase
axios
@react-navigation/native
react-native-reanimated
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.
