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
J-Book: M&A
J-Book: M&A is a professional reference tool for everyone who needs fast, reliable command of language, concepts, and market-standard terminology in the context of transactions — from transaction lawyers and investmen...
$1.99 · In-app purchases
PRICE
$1.99
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 J-Book: M&A: map the core Finance 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
Incorporate user feedback mechanisms for continuous improvement.
Assumption to check: Lack of user reviews or feedback to improve features
Validate with people who use this workflow before building.
Hypothesis 2
Provide more advanced analytics and reporting features.
Assumption to check: Limited financial insights and analytics
Validate with people who use this workflow before building.
Hypothesis 3
Implement automatic categorization and tagging for easier management.
Assumption to check: Potential difficulty in transaction categorization and management
Validate with people who use this workflow before building.
Hypothesis 4
Offer a more flexible pricing model with trial periods.
Assumption to check: High subscription costs for 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
J-Book: M&A is a professional reference tool for everyone who needs fast, reliable command of language, concepts, and market-standard terminology in the context of transactions — from transaction lawyers and investment teams to advisory professionals. The content is deliberately curated for real-world use: terminology and definitions as applied in sophisticated M&A processes — clearly articulated, consistent, and immediately accessible. Highlights Curated M&A glossary, continuously maintained Precise full-text search across terms and definitions Pin key terms to your personal deal shortlist Related Terms: navigate contextually to connected concepts Pronunciation support for terms — ideal for international teams Share definitions with a single tap Fully offline-capable after initial load (on-device cache) Optional inverted color palette for comfortable reading Who Is It For? M&A, Corporate & Transaction Lawyers Private Equity, Venture Capital & Corporate Development Investment Banking & M&A Advisory Founders and operators navigating deal processes Disclaimer: J-Book: M&A is intended for informational and educational purposes only and does not constitute legal or tax advice.
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
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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.
