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
Melody Ringtones
personalize your phone with melody ringtones! create custom ringtones from your favorite songs, videos, or sounds in just a few taps
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.8
36 ratings · Below Average
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/
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 Melody Ringtones: 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 editing features like effects or transitions.
Assumption to check: Limited ringtone customization options
Validate with people who use this workflow before building.
Hypothesis 2
Improve stability and optimize performance.
Assumption to check: Frequent crashing reported by users
Validate with people who use this workflow before building.
Hypothesis 3
Make pricing and benefits of purchases clearer to users.
Assumption to check: In-app purchases are unclear
Validate with people who use this workflow before building.
Hypothesis 4
Regularly update app with new features based on user feedback.
Assumption to check: Low user ratings due to lack of features
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
personalize your phone with melody ringtones! create custom ringtones from your favorite songs, videos, or sounds in just a few taps. choose the part of the audio you love, edit it, and set it as your ringtone, alarm, or notification sound. key features: easy audio extraction: select any song or video, and turn it into a ringtone. simple editing tools: trim and adjust audio clips to your liking. quick setup: save and set your ringtone with one tap. custom recording: record your own sounds to create truly unique ringtones. get premium: use the audio editor to the fullest, enjoy an ad-free experience, and unlock unlimited features! subscription: payment will be charged to itunes account at confirmation of purchase. subscription with a free trial period will automatically renew to a paid subscription. subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. account will be charged for renewal within 24 hours prior to the end of the current period at the rate of the selected plan. subscriptions and auto-renewal may be managed by going to account settings after purchase. you can cancel your subscription or free trial in the itunes settings at least 24-hours before the end of the free trial period. the cancellation will take effect the day after the last day of the current subscription period and you will be downgraded to the free service. subscription options: - weekly price: $ 3.99 - lifetime $ 29.99 for other currencies, the price corresponds to the same tier on the app store pricing matrix. eula - https://www.apple.com/legal/internet-services/itunes/dev/stdeula privacy policy - https://melodyringtones.notion.site/privacy-policy-1c1914dec500804691a4d8cdb0f9ad22 terms - https://melodyringtones.notion.site/terms-conditions-1c1914dec5008047915fda0841d9c1e8
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
react-navigation
react-native-audio-toolkit
zustand
expo-media-library
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.
