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
CoinTool: Crypto Sentiment
Track crypto market sentiment in real-time
$2.99 · In-app purchases
PRICE
$2.99
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.
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.
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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 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 CoinTool: Crypto Sentiment: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
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Continue in Rork >
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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
Provide a simple onboarding process with step-by-step tutorials.
Assumption to check: Users often find finance apps too complex and overwhelming.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to create custom alerts based on various parameters.
Assumption to check: Many apps lack customization options for alerts.
Validate with people who use this workflow before building.
Hypothesis 3
Implement WebSocket for real-time updates on portfolio values.
Assumption to check: Real-time data updates can be slow in finance apps.
Validate with people who use this workflow before building.
Hypothesis 4
Clearly outline the benefits of each subscription tier with a comparison chart.
Assumption to check: Subscription models can be confusing.
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
Track crypto market sentiment in real-time. CoinTool shows you what the market is feeling — from Fear & Greed and Rainbow Chart zones to Pi Cycle signals and funding rates — all in one dashboard. No account required, no ads. SENTIMENT DASHBOARD - Fear & Greed Index with full history back to 2018 - Bitcoin Rainbow Chart — see if BTC is cheap or expensive at a glance - Pi Cycle Top Indicator — the signal that called every BTC cycle top since 2013 - Altcoin Season Index and BTC Dominance tracking - Funding Rate Sentiment across major trading pairs REAL-TIME MONITORING - Live Activities and Dynamic Island — BTC price on your Lock Screen without opening the app - Price and sentiment alerts with custom thresholds - Interactive widgets for your Home Screen and StandBy mode - Top 100 cryptocurrencies with live prices and 24h changes BUILT FOR PRIVACY - All data stored locally on your device - No account, no email, no tracking - No ads. Ever. ONE-TIME PURCHASE CoinTool is a one-time purchase — no subscription, no hidden fees. Pay once, use forever. Every feature included, every future update free. CoinTool is designed for crypto enthusiasts who want to understand market sentiment, not just watch prices. Whether you are timing entries, managing risk, or simply staying informed — CoinTool gives you the signals that matter. Get CoinTool today and start reading the market.
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
Axios
Redux
React Navigation
react-native-chart-kit
BUILD KIT DIFFICULTY
Intermediate
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.
