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
GRAI: Remix What’s Trending
Ever dreamed of creating your own viral TikTok track?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
69 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 GRAI: Remix What’s Trending: 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 a wider variety of songs and genres.
Assumption to check: Limited song selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better audio processing for remixes.
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 3
Focus on a more polished and user-friendly design.
Assumption to check: Clunky user interface
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate social sharing and collaboration features.
Assumption to check: Lack of social 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
Ever dreamed of creating your own viral TikTok track? GRAI makes music creation as easy as tapping a button. Remix trending songs and TikTok audios in seconds to match your mood or video - no DJ skills needed. Each track you create is totally unique, so your sound never sounds like anyone else's. Ready to go from meme to music superpower? GRAI puts instant audio creativity in your hands. With GRAI, trends start with you. Choose a banger or a viral TikTok clip and let AI do the rest: add your own twist, adjust the vibe, and export a fresh track. It’s perfect for TikTok videos, Instagram Reels, or any social post that needs an original background sound. Imagine adding upbeat tunes, moody grooves, or any style of music instantly. Whether you want to remix the latest hit or produce a chill background score, GRAI does it all with one tap. Struggling to find the perfect soundtrack for your videos? GRAI has got your back. Our app recommends trending sounds to fit every vibe - from party anthems to mellow tunes. Describe your mood or tap a suggestion, and watch GRAI match a track to your idea. You can also browse genres like pop, EDM, hip-hop, or explore top charts to find inspiration. All GRAI tracks are royalty-free, so you can confidently post your new music on TikTok or anywhere you go viral. GRAI also turns any creator into a DJ or meme maestro. Want to make a quick remix for fun? Use the easy editor to chop, loop, or add effects and share a laugh-worthy soundtrack in seconds. Looking for an epic background score for your vlog or gaming clip? GRAI’s dynamic sound library and AI generator have got you covered. Every creation is original and copyright-safe, giving you endless share-worthy sounds to boost your views. Join the community where audio trends are born. Download GRAI now and start creating unique tracks today! It’s free, one-tap music magic designed for Gen Z content creators.
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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.
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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.
