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
TinySong
TinySong turns any text message into a short, catchy song you can send instantly.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
407 ratings · Top 5%
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 TinySong: map the core Entertainment 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
Implement personalized recommendations based on user listening habits.
Assumption to check: Limited song discovery features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Ensure adaptive bitrate streaming for smoother playback.
Assumption to check: Inconsistent audio playback experience
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and prioritize core functionalities.
Assumption to check: Cluttered UI with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Add options to share songs or playlists on social media.
Assumption to check: Lack of social sharing 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
TinySong turns any text message into a short, catchy song you can send instantly. From inside jokes and birthdays to check-ins, reminders, and even the most mundane message imaginable. Type it. Pick a vibe. Send it as a TinySong. TURN ANY MESSAGE INTO A TINYSONG - Inside jokes - Check-ins - Apologies - Reminders - Birthdays and holiday wishes - The most mundane message imaginable If you can type it, TinySong sings it. PICK A VIBE OR GENRE. WE'LL DO THE REST. - Boring message? Disco. - Roommate left dishes? Death metal. - Sweet nothings? K-pop. - Miss your friend? Emo. - Apology to your partner? Gregorian chant. ...or let TinySong surprise you. HOW IT WORKS 1. Type your message 2. Choose a vibe or genre 3. Generate your TinySong 4. Send or share it instantly No accounts. No setup. No friction. SHARE IT ANYWHERE - Text it - AirDrop it - Post it - Save it WHY TINYSONG? Because some messages hit better as a song. Because music makes messages stick. Because TinySongs turn ordinary moments into something memorable. TinySong is perfect for making someone laugh, breaking the ice, or when words alone just aren’t enough. Start a 3-day free trial for unlimited TinySongs. Cancel anytime. Tiny messages. Big smiles. Say it as a TinySong. ——— Terms of use: https://tinysong.app/terms/
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-av
react-native-reanimated
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.
