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
iRetroPhone - Rotary Dialer
Take your iphone back to the 20th Century.
$2.99 · In-app purchases
PRICE
$2.99
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 included14 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 iRetroPhone - Rotary Dialer: 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
Add features like contact integration and favorites.
Assumption to check: Limited functionality compared to modern dialers
Validate with people who use this workflow before building.
Hypothesis 2
Offer themes or customizable dials.
Assumption to check: Nostalgic design may not appeal to all users
Validate with people who use this workflow before building.
Hypothesis 3
Integrate voicemail and call history.
Assumption to check: Lack of advanced call features (e.g., voicemail)
Validate with people who use this workflow before building.
Hypothesis 4
Add Bluetooth and VoIP support.
Assumption to check: No support for modern connectivity options
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
Take your iphone back to the 20th Century. "And iRetroPhone, the goofiest $2.99 I’ve spent so far, draws an old-fashioned rotary dial on the screen." - Saul Hansell (New York Times - Bits Blog) Retro Rotary Dial Phone Application for your iphone (And it really works!!) As one of the inaugural apps to grace the App Store, iRetroPhone set a precedent for creativity and uniqueness in mobile applications. Experience the Magic of Rotary Dialing With iRetroPhone, we've meticulously recreated the tactile and auditory sensations of the classic rotary dialer. Every spin of the dial, every click, brings with it a wave of nostalgia, transporting users to a simpler time where every call was an experience in itself. Features That Dial Back Time: - Authentic Rotary Interface: Designed to mimic the look and feel of vintage rotary phones, providing an immersive retro experience. - Dial-Up Sound Effects: High-quality, realistic sound effects that replicate the mechanical sounds of a rotary dialer. - Customizable Skins: Choose from a variety of classic phone models to personalize your iRetroPhone experience. Check our website (http://www.iRetroPhone.com) for the latest demo movie.
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
expo-av
react-native-reanimated
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.
