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
Stemify : AI Vocal Remover
Stemify is the ultimate AI tool for all musicians and music lovers
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.6
269 ratings · Top 50%
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 Stemify : AI Vocal Remover: 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
Improve AI algorithms for better accuracy and speed.
Assumption to check: Inconsistent processing quality with audio files
Validate with people who use this workflow before building.
Hypothesis 2
Expand compatible audio file formats.
Assumption to check: Limited file format support
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with more free features.
Assumption to check: Subscription model may deter casual users
Validate with people who use this workflow before building.
Hypothesis 4
Implement onboarding tutorials and tips for users.
Assumption to check: Lack of detailed user guidance
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
Stemify is the ultimate AI tool for all musicians and music lovers. Use AI to extract or remove vocals & instruments from any song and play your favorite music in any key, and at any speed. Stemify is also the best place to listen, share, and organize your work-in-progress music. Core Features * AI Audio Separation of Stems - Easily separate vocals, drums, guitar, bass, piano, strings, and other instruments in any song. Stemify is your vocal remover or backing track maker. - AI Lyric Transcription: Convert music into text effortlessly. Supports audio in English, Spanish, Portuguese, French, and Italian. Transcribe the lyrics of your music for the best karaoke track maker. * AI Mashup - Mashup Maker: Seamlessly merge songs, auto-match BPM & key. - Remix Songs: Create your own edits, remixes, and party mixes. - DJ Mixer Tools: Adjust vocals, drums, bass, and instruments. - Audio Effects: Add reverb, delay, distortion, lo-fi, and more. * Smart Metronome - Instantly generate click tracks that are in sync to the beat of any song. * AI Key Detection - Detect and change the song key and instantly transpose chords to all 12 keys. * Collaborative Setlists - Invite collaborators, fine-tune song elements, and centralize all your musical work for enhanced productivity. - Share links to your music with friends. See who listens and manage access to your projects. - Record and nurture your inspiration whenever it strikes. - Our encryption is on par with Dropbox and SoundCloud and we are aiming to be the most secure place for unreleased music. * Export your mix - Share your mix results with your friends - Standard format: M4A, CAF - HQ format: FLAC, WAV It has never been easier to create your own creative performance! The application is perfect for: - Karaoke - Songwriting - Teach - Social Media Content - Practice - Remix - Perform Live - Play for fun - Drummers - Learn - Producers - Singers - Bassists - Pianists - Guitarists - Dancers And all music amateurs! Terms of Service: https://www.freeprivacypolicy.com/live/e62c5af3-6871-4a44-b918-61b575b2ec1f Privacy Policy: https://www.freeprivacypolicy.com/live/bac1cc4c-47d2-4736-9afb-31850e781b7e 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.
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
@react-navigation/native
expo-file-system
react-native-progress
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.
