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
LanceX
*WARNING: This application does not provide any proxy services.*
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
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 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 LanceX: map the core Utilities 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
Improve algorithm to enhance accuracy in low-light situations.
Assumption to check: Inaccurate measurements in certain lighting conditions
Validate with people who use this workflow before building.
Hypothesis 2
Add more advanced measurement options like angles or irregular shapes.
Assumption to check: Limited measurement types
Validate with people who use this workflow before building.
Hypothesis 3
Implement iCloud sync to save measurements across devices.
Assumption to check: Lack of cloud sync
Validate with people who use this workflow before building.
Hypothesis 4
Introduce an onboarding tutorial to help users understand how to use the app effectively.
Assumption to check: No tutorial for new 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
*WARNING: This application does not provide any proxy services.* **LanceX** is a web development and proxy utility designed for developers, requiring professional knowledge to use effectively. ## Benefits and Advantages: - Enhances online privacy and anonymity by creating a private network from a public internet connection. - Enables forwarding of network requests to proxy servers. - Allows interception of specific data within network requests and responses, including traffic decryption and data modification using MITM (Man-in-the-Middle) techniques. ## Highlighted Features: - Captures all HTTP/HTTPS/TCP/UDP traffic from any applications on your device and redirects it to a proxy server based on highly configurable rules. - Supports multiple protocol formats and data algorithms. - Offers customizable DNS/DoH/DoQ/DoT settings. - Allows customization of traffic forwarding rules. - Provides HTTP decryption through MitM. - Includes QR code tools. - Supports iCloud configuration backup and restore. - Records and displays HTTP requests and responses. - Fully supports IPv6. - Provides a shared proxy. - Supports on-demand rules. - Includes various network diagnostic tools. Feedback is important. If you have any concerns, please let us know.
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-navigation
expo-camera
@react-native-async-storage/async-storage
expo-sharing
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.
