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
ZZZ Driver
ZZZ Driver is an interactive sound and transformation simulator designed for iPhone and Apple Watch.
$2.49 · In-app purchases
PRICE
$2.49
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 ZZZ Driver: 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
Enhance content recommendations using AI algorithms.
Assumption to check: Limited content variety and discovery options
Validate with people who use this workflow before building.
Hypothesis 2
Implement a modern UI/UX design.
Assumption to check: Poor user interface design
Validate with people who use this workflow before building.
Hypothesis 3
Add features like picture-in-picture mode and adjustable playback speeds.
Assumption to check: Inadequate video playback features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share videos on social media platforms.
Assumption to check: Lack of social sharing 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
ZZZ Driver is an interactive sound and transformation simulator designed for iPhone and Apple Watch. Choose a Capsem, insert it into the Driver, and activate standby sounds, transformation effects, finishers, and super finishers. With touch, swipe, rotation, and Digital Crown interactions, ZZZ Driver turns your devices into an immersive transformation experience. The iPhone app now includes two full-screen simulators: ZZZ Phone and ZZZ Belt. Select different Capsems, trigger their corresponding recognition sounds, play character dialogue and music, record your own voice, and explore the Nightmare location experience on the map. The Apple Watch app includes Z Driver, ZZZ Phone, and a dedicated dialogue module, allowing you to enjoy the core interactions directly from your wrist. Features: • ZZZ Phone and ZZZ Belt simulators on iPhone • Z Driver and ZZZ Phone experiences on Apple Watch • Multiple selectable Capsems with unique recognition sounds • Standby, transformation, finisher, and super finisher effects • Character dialogue featuring Mojin Baku, Nemu, and Zero • Japanese dialogue with English and Chinese subtitles • Sequential dialogue and music playback • Touch-and-hold voice recording with instant playback • Interactive Nightmare map and Zeroider sound experience • Touch, swipe, rotation, and Digital Crown controls • English, Japanese, and Simplified Chinese interface support • Core Apple Watch features work independently Whether you enjoy role-play, transformation sounds, character dialogue, or interactive wrist-based experiences, ZZZ Driver offers a fun and immersive experience anytime, anywhere.
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
Supabase
react-navigation
react-native-video
zustand
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.
