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
Retrotones
Clap up hands ,snooz' the alarm.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
6 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 included16 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 Retrotones: 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
Expand the library with user-generated sounds or partnerships.
Assumption to check: Limited selection of sounds compared to other soundboard apps
Validate with people who use this workflow before building.
Hypothesis 2
Offer a subscription model for unlimited access.
Assumption to check: In-app purchases can deter users
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social sharing options for sounds.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to upload their own sounds or create playlists.
Assumption to check: Lack of customization options for 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
Clap up hands ,snooz' the alarm. Retrotones main feature is the sonically sensitive alarm. 1 clap(113db or above) of your hands will snooze the alarm for 5-10 minutes. 2 claps (2nd louder than the first) will cancel the alarm. Retrotones alarm features the 4 main tones of vintage phones. Play Retrotones out loud to gently remind someone you've "hung up" on them.Sync alarms with friends in a group to "hang up" on any situation (not recommended for classroom settings). Kids will also enjoy the clapping function of Retrotones and maybe they'll look forward to waking up in the morning. Retrotones will NEVER collect your data and will never have in app purchases.Once you own Retrotones ALL upgrades will be free. For best results keep phone charged at a full level or leave on charger. Avoid excess background noise(loud music etc.). Turn noise cancellation off if applicable. Echos may cause alarm to shut off instead of snooze. For this version set a backup alarm to be safe. Upgrades are on the way and they are free to all Retrotones owners.
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-share
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.
