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
HODLings: Private Coin Tracker
Take control of your Bitcoin and crypto portfolio without giving up your privacy
$0.99 · In-app purchases
PRICE
$0.99
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 HODLings: Private Coin Tracker: 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
Introduce advanced analytics and insights for each coin.
Assumption to check: Limited features for tracking multiple cryptocurrencies
Validate with people who use this workflow before building.
Hypothesis 2
Enable users to share their portfolios or insights with friends.
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Implement a guided onboarding to help users understand the app's functionalities.
Assumption to check: Poor user onboarding process
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize their dashboards and notifications.
Assumption to check: Lack of customization options for portfolios
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
Take control of your Bitcoin and crypto portfolio without giving up your privacy. HODLings is a powerful, minimalist crypto tracker. While other apps want your email and data—HODLings wants none of it. HODLings is built for the privacy-conscious investor who needs a clean, fast way to monitor their holdings and follow market trends and sentiment. WHY CHOOSE HODLings? - 100% ANONYMITY: No accounts. No sign-ups. No Google/Facebook logins. We have no access to your identity — just open the app and start tracking your coins. - SECURE LOCAL STORAGE: Your crypto portfolio data stays on your device. We do not use cloud servers, ensuring your financial data is never sitting on a vulnerable third-party database. - AD-FREE EXPERIENCE: distraction-free experience. No external trackers, no sponsored listings, and no "shilling" of coins. CORE FEATURES: - PORTFOLIO P&L: Track your profit and loss over time with a simple, intuitive interface. - REAL-TIME MARKET DATA, ANALYTICS, & SENTIMENT: Monitor price movements, sentiments, and news for thousands of assets including Bitcoin (BTC), Ethereum (ETH), Solana (SOL), and more. - GLOBAL FIAT SUPPORT: View your balance in 25+ currencies, including USD, AUD, EUR, GBP, and JPY. - MINIMALIST DESIGN: A clean, dark-mode optimized interface focused on clarity. Whether you are a long-term HODLer or a casual investor, HODLings provides the tools you need to stay informed without being tracked. Stop being the product. Start being the investor. Download HODLings today for a private crypto tracking experience.
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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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
Supabase
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.
