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
Swing21
No overcomplicated charts
$8.99
PRICE
$8.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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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 included
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.
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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
No overcomplicated charts. No news hype. Pure mathematical lens of market momentum. Swing21 is a sharp market monitoring tool and ultimate analytical companion for tracking crypto trends and testing your trading strategies. Designed for those who want to cut through the noise, Swing21 strips away complicated indicators and focuses entirely on relative performance. We provide deep insights into a curated basket of 21 top cryptocurrencies, helping you instantly see which assets are leading the market and which are lagging. Key Features: • Live public market data. • Relative Strength Analysis: Quickly identify market leaders and laggards within our carefully selected 21-asset crypto basket. • Strategy Sandbox: Put your market thesis to the test. Build and track a virtual portfolio to see how your calls perform over time, without the financial risk. • Intuitive Watchlists: Keep a close eye on the specific coins you care about most with clean, distraction-free watchlists. • Clean, Fast Interface: Enjoy a streamlined, no-login experience designed for quick market analysis on the go. Disclaimer: Swing21 is currently an educational and analytical tool. We are not a broker and do not offer real money trading, custody, or deposits. Live market data is real, but all the portfolio features in this version are simulated. The information provided does not constitute financial advice. Terms of Service: https://swing21.com/terms Privacy Policy: https://swing21.com/privacy
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
