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
ChartSignl
ChartSignl helps you read stock charts with confidence
$4.99 · In-app purchases
PRICE
$4.99
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.
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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 included15 files
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.
// RORK SYSTEM PROMPT
Rork plan preview for ChartSignl: map the core Finance 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 user reviews and ratings feature.
Assumption to check: Lack of user reviews and trust
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear explanations of subscription benefits.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Integrate multiple financial data APIs for better insights.
Assumption to check: Limited financial data sources
Validate with people who use this workflow before building.
Hypothesis 4
Focus on a minimalist design for easier navigation.
Assumption to check: User interface may feel cluttered
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
ChartSignl helps you read stock charts with confidence. Search any symbol, view interactive charts, and get instant AI-powered analysis that identifies the levels that matter most. WHAT YOU GET: - AI-detected support and resistance levels with confidence scores - Confluence zones where multiple indicators align - Trade setups with clear entry, target, and stop levels - Risk factors and invalidation points for every analysis - Technical details including EMAs, Bollinger Bands, ATR, Fibonacci, and volume profile HOW IT WORKS: 1. Search any stock symbol 2. Select your timeframe 3. Tap Analyze — Atlas, our AI engine, does the rest 4. Review clear, actionable insights in seconds DESIGNED TO REDUCE TRADING STRESS: ChartSignl isn't a typical trading terminal. We built it with a calm, focused aesthetic so you can get the clarity you need without the noise. Spend less time staring at charts and more time making confident decisions. FREE TO START: Get 3 free analyses per week. Upgrade to ChartSignl Pro for unlimited analyses, advanced indicators, full history, and priority support. ChartSignl Pro is available as a monthly subscription at $4.99/month. Payment is charged to your Apple ID account at confirmation of purchase. Your subscription automatically renews unless canceled at least 24 hours before the end of the current period. You can manage and cancel your subscription in your Apple ID account settings. Any unused portion of a free trial period will be forfeited when you purchase a subscription. Privacy Policy: https://www.chartsignl.com/privacy Terms of Use: https://www.chartsignl.com/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
Axios
Zustand
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.
