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
Luther’s Commentary: Galatians
Martin Luther’s commentary on the book of Galatians in an easy-to-use app (abridged American English translation by Theodore Graebner)
$1.99 · In-app purchases
PRICE
$1.99
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 included16 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Luther’s Commentary: Galatians: map the core Reference 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 content or community discussions.
Assumption to check: Limited content depth compared to other commentary apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline storage for reading without internet.
Assumption to check: No offline access to commentaries
Validate with people who use this workflow before building.
Hypothesis 3
Add themes and font size adjustments.
Assumption to check: Basic user interface with no customization options
Validate with people who use this workflow before building.
Hypothesis 4
Integrate interactive elements to engage users.
Assumption to check: Lack of interactive features (e.g., quizzes, notes sharing)
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
Martin Luther’s commentary on the book of Galatians in an easy-to-use app (abridged American English translation by Theodore Graebner). The original is based on a series of lectures that Dr. Martin Luther gave in 1531. From Graebner’s preface: “The importance of this Commentary on Galatians for the history of Protestantism is very great. It presents like no other of Luther’s writings the central thought of Christianity, the justification of the sinner for the sake of Christs merits alone.” App features: •The complete text of Theodore Graebner’s translation. • Easily jump between chapters and to main topics within chapters. • The text size can be enlarged to make it easy to read. • No ads. • No Internet access needed once the app is installed. • Fast and easy to use.
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/native
react-native-paper
react-native-share
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.
