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
Digital Force Bag
Digital Force Bag (DFB) is a joint release from UK Magicians Nick Einhorn & Craig Squires, and developed by Marc Kerstein
$44.99 · In-app purchases
PRICE
$44.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
34 ratings · Top 30%
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 Digital Force Bag: map the core Entertainment 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-generated tricks and community features.
Assumption to check: Limited content variety can lead to user boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more flexible subscription plans or a freemium model.
Assumption to check: High price point may deter new users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a recommendation system based on user interests.
Assumption to check: Difficulty in discovering new tricks.
Validate with people who use this workflow before building.
Hypothesis 4
Provide step-by-step guided tutorials for new tricks.
Assumption to check: Lack of interactive tutorials can confuse 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
Digital Force Bag (DFB) is a joint release from UK Magicians Nick Einhorn & Craig Squires, and developed by Marc Kerstein. This app is a unique digital tool for the serious mentalist or magician and is available for entertainment purposes only. DFB has been designed to allow the user to force any one of 100 items. It is easy enough for an eight year old to operate but useful enough for the world’s greatest magicians! Two effects are included to get you started immediately and an option to fully customise DFB for your own personal use is currently included free! Key Features ● Easy to learn and remember ● Fully customisable for your own routines and languages ● Your audience will never suspect you are using a magic app ● Fun for the aspiring beginner and and an absolute essential for the professional ● Result can be different every time ● Export option allows you to share your routines with friends worldwide
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
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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.
