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
Bitkey - Bitcoin Wallet
Bitkey is the safe, simple, and secure way to own and manage your bitcoin
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
114 ratings · Top 15%
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 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 Bitkey - Bitcoin Wallet: 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 real-time transaction updates and notifications.
Assumption to check: Users often find transaction delays frustrating.
Validate with people who use this workflow before building.
Hypothesis 2
Create a guided onboarding experience to educate users on security best practices.
Assumption to check: Security features can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate a chat support feature for instant assistance.
Assumption to check: Limited customer support options.
Validate with people who use this workflow before building.
Hypothesis 4
Provide a fee calculator and options for lower-cost transactions.
Assumption to check: High fees for transactions.
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
Bitkey is the safe, simple, and secure way to own and manage your bitcoin. It’s a mobile app, hardware device, and a set of recovery tools all in one wallet. Control If you hold bitcoin with an exchange, you don’t control it. With Bitkey, you hold the private keys and control your money. Security Bitkey is a 2-of-3 multi-signature wallet which means there are three private keys protecting your bitcoin. You always need two out of three keys to sign a transaction, giving you extra protection. Recovery Bitkey recovery tools help you recover your bitcoin if you lose your phone, hardware, or both, without needing a seed phrase. Manage Use the app to send, receive, and transfer bitcoin safely on the go. For added protection, you can set a daily spending limit on your phone. Visit https://bitkey.world to purchase the Bitkey hardware wallet.
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
React Query
@react-native-async-storage/async-storage
Expo Camera
TypeScript
BUILD KIT DIFFICULTY
Advanced
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.
