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
Bitcoin Mining: Cloud Miner
Crypto Miner
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.6
41 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 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 Bitcoin Mining: Cloud Miner: 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 updates and improved algorithms for performance tracking.
Assumption to check: Users often find mining performance tracking inaccurate.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their mining pool preferences and parameters.
Assumption to check: Limited customization options for mining settings.
Validate with people who use this workflow before building.
Hypothesis 3
Include tutorials and guides to help users understand Bitcoin mining.
Assumption to check: Lack of educational resources for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for lower-end devices.
Assumption to check: Performance issues on older devices.
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
Crypto Miner B99 Mining is a cloud-based Bitcoin mining app with a real-time dashboard to monitor hash power and reward progress. B99 Cloud Miner has offered cloud Bitcoin mining to miners worldwide since 2018. The app does not drain your battery or mine directly on your device. It connects to our remote servers to deliver live Bitcoin mining statistics, BTC mining data, estimated rewards, and detailed hashrate insights. How Does B99 Bitcoin Mining Work? You do not need any technical knowledge to get started. B99 Mining runs on dedicated cloud servers that handle all Bitcoin mining operations in the background. Each user is assigned hash power based on their selected plan, and mining results are updated in real time through the app. Why Cloud Mining? No hardware to buy, no electricity costs, no setup. Traditional cryptocurrency mining requires expensive equipment and technical expertise, and cloud mining removes all of that. Key Features Mine crypto for free with our Free Plan that gives you 25 GH/s of hash power, plus daily free hashrate boosts that can push your total beyond 100 GH/s. 14 mining plans with flexible contracts. Each plan has its own hashrate tier, session length, and performance tuning. Daily login rewards, hourly BTC boosts, and streak bonuses. The more you mine, the bigger your loyalty bonuses get, and they can multiply your Bitcoin rewards over time. One clean dashboard to track your rewards, monitor your balance history, and follow real-time mining progress. There is no complexity, and the app breaks down cloud mining concepts for you. Transfer your Bitcoin rewards to any personal Bitcoin wallet. Your account and BTC are protected with encryption and multi-layer security, and every transaction is logged and traceable. Invite friends to join B99 Mining. As they stay active, you can earn BTC mining rewards too. Thousands of people mine crypto on mobile with us across the globe. Important: Bitcoin rewards from crypto mining may fluctuate based on network and market conditions and are not guaranteed. All values displayed in the app, including rewards and hash power, are estimated and may vary based on system performance. Mining results should not be considered a fixed or assured source of passive income. This app does not provide financial, investment, or legal advice. B99 Mining is an independent application and is not affiliated with any mining pool, blockchain network, or financial institution. Terms of Use: https://www.b99mining.com/terms Privacy Policy: https://www.b99mining.com/privacy Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Victory Native
Axios
React Navigation
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.
