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
Ringtones Maker - the ring app
A completely free ringtone production software
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
427,681 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 included15 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 Ringtones Maker - the ring app: map the core Productivity 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
Allow importing from more sources like cloud services.
Assumption to check: Limited music import options
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the trimming process with more intuitive sliders.
Assumption to check: Complex ringtone trimming interface
Validate with people who use this workflow before building.
Hypothesis 3
Improve audio processing for better sound.
Assumption to check: Inconsistent audio playback quality
Validate with people who use this workflow before building.
Hypothesis 4
Streamline sharing ringtones via social media and messaging apps.
Assumption to check: Complicated 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
A completely free ringtone production software. Without connection to the computer, the ringtone can be produced via iPhone. Set the song collected by you as ringtone. The APP size is only about 20Mb after optimization (slight difference between different models). Your iPhone ringtone can be produced quickly after quick downloading. Based on the latest production method, the ringtone production can be completed within several seconds. [Service concept] Each iPhone user can successfully produce the ringtone. In case of any problem arising in the process of producing the ringtone, directly contact us as per the contact way in the app to get one-to-one help free of charge. [Advantage] -Many ringtones: The real-time update of popular ringtone, funny ringtone, the latest ringtone and SMS ringtone is realized. -Supports iOS26 one-click setting as ringtone, only takes 1 second. -Many tutorials: Two methods for producing the ringtone (including GarageBand and iTunes) are provided. -Super detailed iPhone ringtone production image-text and video tutorial are detailed into each click with 100% successful setting. -Cover all iPhone models from iPhone4s to the latest iPhone17/Pro/Max. [Feature] -Choose the video from the album and automatically extract the audio from the video. -Import the audio via UTI(Uniform Type Identifier): Import the audio directly from other APPs (such as WeChat and QQ). -Upload the audios (such as mp3 and m4a) to iPhone from the computer via http service. -Accurate to 0.1s ringtone clipping. -Support the fade-in fade-out setting within 1-5s. -Support the video and audio converted to mp3 and m4r formats. -Support the splicing of many ringtone audio files. -Set the audio as charging tone. -Share the ringtone to your friends. [Contact us] Mail: [email protected] Your suggestions are very important for me. You can contact me via "Feedback" in the app.
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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
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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.
