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
CompareMerge
CompareMerge is a software tool for file comparison and merging text-like files.
$13.99 · In-app purchases
PRICE
$13.99
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 included17 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 CompareMerge: map the core Developer Tools 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
Simplify the UI by providing clear instructions and visual cues.
Assumption to check: Users find file comparison tools complex and overwhelming.
Validate with people who use this workflow before building.
Hypothesis 2
Add support for more file formats, including images and PDFs.
Assumption to check: Limited support for various file types.
Validate with people who use this workflow before building.
Hypothesis 3
Implement real-time collaboration for users to merge files together.
Assumption to check: Lack of collaborative features.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a free tier with basic features to attract more users.
Assumption to check: High subscription costs 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
CompareMerge is a software tool for file comparison and merging text-like files. It is useful for determining what has changed between versions, and then merging changes between versions. Functions of the application: - SUPPORT MULTI-LANGUAGES: English Deutsch Français 日本語 한국어 Español Português Čeština Dansk Suomi Italiano Nederlands Norsk Polski Русский Svenska ไทย Türkçe Tiếng Việt 中文（中国） 中文（台灣） - COMPARE FOLDERS/FILES: can compare both 2 files or 2 folders - QUICK COMPARE FOLDERS: allow to quickly compare two folders' files by size or date or both or with full content (slower) - BLANK COMPARE: Allow to create blank edit window to compare text then save later - CUSTOM THEME COLOR: User can select predefined theme color or customize edit text color, background color.... - INLINE EDIT (Edit/Merge at the same time) : Compare and Merge 2 text files: allow you to edit/compare/merge 2 text files in the same windows - LINE NUMBER: When edit file, showing line number will make it easier to know exactly changes positions. - GENERATE PATCH: the application also contains patch generating capabilities. - FILE FILTERS: Include or exclude files that match regular expressions. Other than that, after compare 2 folders, you could filter display item base on file name. - INCLUDE SUBFOLDERS: This option lets you control the depth of a folder comparison. Enabling it compares all folder levels - COPY TO: after compare 2 folder, you can select left or right files to copy to different location (example: when release change source) - DELETE Left/Right/Both: after compare 2 folder, you can select left or right files to delete - IGNORE CASE, SPACE: Allow to ignore Case, Space in Edit/Merge window - IGNORE End-Line code: Allow to ignore difference in End Line Code (LF for Mac・Unix file, CR-LF for Windows file, or CR for Mac classic file) in Edit mode. Note: when compare folders, EOL was not ignored. - EXPORT / CREATE REPORT: Allow to export compare/merge result to clipboard or to files (support formats: CSV, Text, HTML) OTHER FUNCTIONS: - Syntax highlight - Theme color - Export to zip file - User can compare hidden files, folder (example: .git folder) - Allow to merge binary-plist file - In edit mode, a small view is show to the exact text difference
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
Zustand
react-navigation
react-native-paper
expo-file-system
BUILD KIT DIFFICULTY
Advanced
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.
