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
MP3 Converter : music editor
MP3 Converter can Extract Audio from your Local and Online Video Files
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
1,530 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 included18 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 MP3 Converter : music editor: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
MP3 Converter can Extract Audio from your Local and Online Video Files. Download and Convert Online Videos to MP3. Trim or mix converted MP3 to your phone or set them as personalized ringtones! Key Features: - Multi-Format Support, extract MP3, AAC, WAV, and more audio formats from various video formats such as 3GP，FLV，MP4，MOV，MXF，MKV，AVI，MPG，MPEG, and others. - Audio Editor (Splicing,Cutting,Shifting,Balance,Fade, etc.) - Vocal Remover, remove vocals from audio track and create accompaniment version for Karaoke. - Multiple audio clippers and splicers，Mix and Reverb - Intelligent denoising function - Quickly set ringtones - Audio Toolbox( Noise reduction, vocal enhancement, vocal/accompaniment separation...) - Multiple methods to import the audio: Wi-Fi Transfer,Video extract, Apple music, file and clipboard - Share extracted audio files via other apps MP3 Converter is perfect for: • Lovers of music production and audio editing • Podcast Maker, Talk Show producer and ASMR anchor • Youtube and TikTok video secondary creation • Musicians and Professional Music Producers • Music students and teachers • Especially for users who are familiar with Audacity or Audition Feature Highlights: • Professional music editor: supporting music clips, mergers, mixing and other advanced features, easy to play ringtones and music! • Add audio effects: choose from the variety of audio effects like, normalizer, EQ, tempo and more • Simple music stitching: song editing and splicing as a whole,connect the favorite songs! • Unique music mixing: free to cut the two songs, mixed together to play, feel different music effects! • Audio toolbox. Currently supported features include enhanced vocals, vocal removal, noise cancellation, automatic gain, accompaniment removal, bass boost, karaoke, etc. No more frustration about not finding the music you love! MP3 Converter offers you the simplest and most efficient solution. Download MP3 Converter and make your music life more vibrant! If you encounter any issues or have any suggestions while using the app, please feel free to contact us. We are more than happy to assist you. Thank you for choosing MP3 Converter! Terms of Service: https://www.freeprivacypolicy.com/live/348ab84f-9274-4a9d-b61b-1770fcc97fcf Privacy Policy: https://www.freeprivacypolicy.com/live/02eb5520-0c08-44e0-9802-20a8b257fdb8 Subscription Info: - The user can cancel his/her subscription at any time by going into iTunes and App Store Apple ID Settings. - All prices include applicable local sales taxes. - Payment will be charged to your iTunes Account after confirmation of purchase. - Subscription automatically renews at least 24-hours before the end of the current period. - The user's account will be charged for renewal within 24-hours before the end of the current period.
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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 to include more audio formats and export options.
Assumption to check: Limited file format support for conversions
Validate with people who use this workflow before building.
Hypothesis 2
Optimize for better performance on lower spec devices.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Implement a better onboarding process with tutorials.
Assumption to check: Confusing user interface for first-time users
Validate with people who use this workflow before building.
Hypothesis 4
Add support for saving and loading files from cloud services.
Assumption to check: Lack of cloud storage integration
Validate with people who use this workflow before building.
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.
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BUILD KIT DIFFICULTY
Advanced
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.
