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
Yokee Karaoke – Start Singing
Yokee™ is the #1 iPhone app that lets you and your friends sing karaoke for FREE.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
95,519 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Yokee Karaoke – Start Singing: 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
Partner with music labels for a wider selection.
Assumption to check: Limited song library compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better audio processing techniques.
Assumption to check: Difficulties in audio recording quality
Validate with people who use this workflow before building.
Hypothesis 3
Standardize UI components for consistency.
Assumption to check: Inconsistent user interface design across screens
Validate with people who use this workflow before building.
Hypothesis 4
Enhance social sharing capabilities and add community features.
Assumption to check: Limited social features for sharing performances
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
Yokee™ is the #1 iPhone app that lets you and your friends sing karaoke for FREE. Now available in a totally redesigned iOS 14 experience. Over 100 Million users are already using Yokee™! Wanna know why? FEATURES: - SING from the endless catalog of music videos - RECORD your version of your favorite songs - SHARE your performance with the world - DISCOVER artists from around the world - CONNECT and listen to your friends performances and vote for their recordings - CAST to your TV, host karaoke party at home FREE SONGS: - With Yokee™ you can always sing for FREE from an unlimited library of songs and videos. - Songs in any language – new FREE content is added daily! Current top hits: * Levitating - Dua Lipa * Dance Monkey - Tones and I * Let It Go - Idina Menzel (Frozen) * Before You Go - Lewis Capaldi * Deja Vu - Olivia Rodrigo * Shallow - Lady Gaga & Bradley Cooper * Lovely - Billie Eilish & Khalid * Into the Unknown (Panic! at the Disco) - Frozen 2 * Mood - 24kGoldn ft. iann dior * Someone Like You - Adele * How Far I'll Go - From The Movie Moana * Girls Like You - Maroon 5 Ft. Cardi B * Happier - Marshmello & Bastille * Perfect - Ed Sheeran - You can also search for more songs in our huge library of your favorite artists, genres and themes. SOUND EFFECTS Your voice is auto-enhanced with echo and a little reverb, so you’ll always sound great. You may also choose to enhance your voice with our special voice effects like CHORUS, RADIO. VIDEO THEMES Create a music clip with video using one of our cool video themes. Snow, Rain, Old, Love, Cute, B&W and more... * Video recording feature is currently available only for part of our catalog. Karaoke has never been so much Fun! UNLIMITED PREMIUM SUBSCRIPTION - You can subscribe for unlimited access to our VIP song catalog - The subscriptions are weekly, monthly and annual* - You'll be able to sing any song as well as record, save and share as much as you like. - Payment will be charged to iTunes Account at confirmation of purchase - 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, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - No cancellation of the current subscription is allowed during active subscription period - Privacy Policy - http://www.TheVoice.app/privacy - Terms of Use - http://www.TheVoice.app/terms *Price are equal to the value that "Apple's App Store Matrix" determines is the equivalent of the subscription price in $USD. Join Yokee™ group on Facebook at https://www.facebook.com/groups/YokeeSingers to meet other Yokees, request songs, get your performance featured, and more! We’d love to hear your queries, reports or suggestions! Find us on Twitter (@yokeekaraoke) or drop us a line to: [email protected]
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
React Navigation
expo-av
BUILD KIT DIFFICULTY
Expert
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.
