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
Sourdough: Starter Companion
Sourdough is a quietly designed companion for caring for your sourdough starter — from the very first feed to your hundredth loaf.
$3.99 · In-app purchases
PRICE
$3.99
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.
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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 included15 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 Sourdough: Starter Companion: 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 a feature to track multiple starters with distinct logs.
Assumption to check: Users struggle with managing multiple starters
Validate with people who use this workflow before building.
Hypothesis 2
Simplify subscription management with clear tier descriptions.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Expand recipe database and user-submitted recipes.
Assumption to check: Limited recipe selection
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a social feature for sharing tips and experiences.
Assumption to check: 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
Sourdough is a quietly designed companion for caring for your sourdough starter — from the very first feed to your hundredth loaf. Built for home bakers who want a calm, premium tool, not a flashy game. WHAT IT DOES • Tracks when your starter is bake-ready and when it must be fed next • Adapts predictions to ratio, storage (counter, fridge, freezer), and temperature • Supports any feeding ratio from 1:1:1 to 1:20:20 with live-calculated grams • Notifies you exactly when you need to know — never spam LEARN AS YOU GO Seven hand-written guides walk you from your first 8-day starter creation through the float test, the smells, recovery from neglect, and your first 24-hour bake. MIN REISE — YOUR JOURNEY Earn intrinsic milestones quietly. No streaks. No leaderboards. No grind. Just personal records of you and your starter, year over year. PREMIUM DESIGN Warm Palette. Fraunces serif type. Wax-seal milestone badges. Apple-grade attention to typography, animation, and respect for your time. NORWEGIAN-FIRST Designed in Norway, for Norwegian bakers — with English as a first-class second language. No accounts. No tracking. Just you and your starter.
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
Axios
Zustand
React Navigation
React Native Image Picker
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.
