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
Snap Ringtones
Snap Ringtones is an easy way to create and save ringtones for iPhone.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
9 ratings · Top 30%
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 Snap 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 exclusive ringtones and partnerships with artists.
Assumption to check: Limited ringtone selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more subtle approach to monetization.
Assumption to check: In-app purchase prompts may interrupt user experience
Validate with people who use this workflow before building.
Hypothesis 3
Enhance category browsing with user-friendly filters and search functionality.
Assumption to check: Difficult to navigate through categories
Validate with people who use this workflow before building.
Hypothesis 4
Introduce sharing options for users to share their favorite ringtones on social media.
Assumption to check: Lack of social sharing 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
Snap Ringtones is an easy way to create and save ringtones for iPhone. Choose ready-made sounds or create your own ringtones from audio in just a few seconds. Trim the perfect part, preview the result, and save your favorite tones for calls, messages, alarms, and notifications. Key Features • Create custom ringtones • Trim audio with an easy editor • Ready-made sounds for calls, texts, alarms, and notifications • Save your favorite ringtones • Quick sound preview • Save contact photos and use them in your address book Upgrade to Premium to unlock the full Snap Ringtones experience: • Unlimited ringtone creation • Remove ads Subscription Options Weekly Premium — $4.99/week Yearly Premium — $29.99/year Payment will be charged to your Apple ID account at confirmation of purchase. Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current billing period. Your account will be charged for renewal within 24 hours before the end of the current period. You can manage or cancel or turn off auto-renewal at any time in your App Store account settings. Privacy Policy: https://sites.google.com/view/snapringtones/privacy Terms of Use: https://sites.google.com/view/snapringtones/terms Support: https://sites.google.com/view/snapringtones/support Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Zustand
expo-av
expo-file-system
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.
