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
Tape
Do you still remember the cassettes from the 80s?
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
257 ratings · Top 15%
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 Tape: map the core Music 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
Offer more advanced editing tools like trimming, effects, and mixing.
Assumption to check: Limited editing features compared to desktop software
Validate with people who use this workflow before building.
Hypothesis 2
Add options for users to collaborate on recordings in real-time.
Assumption to check: No collaboration features
Validate with people who use this workflow before building.
Hypothesis 3
Implement audio quality presets and testing for various devices.
Assumption to check: Inconsistent audio quality on different devices
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a social feed where users can share and discover recordings.
Assumption to check: Lack of community features for sharing recordings
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
Do you still remember the cassettes from the 80s? Now you can have it again. You have all your songs from your iPhone or iPod Touch ready in the library. Tape is a cassette player emulator. It plays your music from Apple Music App and shows an animated cassette. There is a large selection of cassettes which you can choose from. This app bring's you back to the 80's. Very easy to use. - Touch for play or pause. - Swipe right for next song. - Swipe left for previous song. - Swipe down for next cassette. - Swipe up for cassette change. - Touch in the upper left corner to select songs. - you can zoom in to original cassette size (pinch to zoom). and because the control is very simple, This app is perfect for the car or on your iPod, iPhone docking Station, have fun with the app! THIS APP ONLY WORKS, IF YOU HAVE MUSIC IN THE APPLE MUSIC APP !!!
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
Expo AV
React Navigation
Zustand
Expo File System
React Native
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.
