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
btcountr
btcountr turns your iPhone into a retro split-flap display for the live Bitcoin price
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 btcountr: 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
Include support for a wider range of cryptocurrencies.
Assumption to check: Limited asset types may frustrate users wanting to track more cryptocurrencies.
Validate with people who use this workflow before building.
Hypothesis 2
Implement analytics features like graphs and performance trends.
Assumption to check: No detailed analytics on asset performance.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the UI with modern design elements to attract more users.
Assumption to check: Basic user interface may not appeal to all users.
Validate with people who use this workflow before building.
Hypothesis 4
Provide more value in the free version or extend trial periods.
Assumption to check: Paywall after limited usage can deter users.
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
btcountr turns your iPhone into a retro split-flap display for the live Bitcoin price. Inspired by classic airport departure boards, it brings that satisfying flip animation to real-time BTC tracking. No charts, no noise—just the price, displayed with style. Features: Real-time Bitcoin Price Tracking — Stay updated with live BTC prices that update automatically Signature Split-Flap Display — Watch prices flip with satisfying animations inspired by classic airport boards Smooth Animations — Every digit flips individually as prices change, creating a mesmerizing cascade effect Haptic Feedback — Feel every price update with optional tactile responses Sound Effects — Optional audio feedback for a fully immersive experience Home, Lock, and Live Activity Widgets — Know the price even at a glance Clean & Minimal — No charts, no clutter—just the Bitcoin price, displayed beautifully One-Time Purchase — $1.99, no subscriptions, no hidden fees Perfect for: Bitcoin enthusiasts who want a beautiful, distraction-free price display Anyone who appreciates retro design and satisfying animations Traders who need quick price updates without opening complex apps Collectors of well-designed, minimal iOS apps
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
Redux
React Navigation
Axios
React Native Reanimated
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.
