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
i know percent
Meet i know percent – your sleek, intuitive assistant in the world of percentages, working in real-time
$0.79 · In-app purchases
PRICE
$0.79
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
20 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's included17 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 i know percent: 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
Add features for multi-step calculations and advanced percentage scenarios.
Assumption to check: Limited functionality for complex calculations
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize themes and layouts.
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 3
Introduce user accounts for saving favorite calculations.
Assumption to check: No user account management
Validate with people who use this workflow before building.
Hypothesis 4
Provide insights on calculation usage and trends.
Assumption to check: Minimal analytics or insights
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
Meet i know percent – your sleek, intuitive assistant in the world of percentages, working in real-time. Our streamlined interface makes solving percentage calculations quick and easy. With i know percent, you have six essential tools at your fingertips: - Calculate percentage increase or decrease from X to Y. - Find what X% of Y is. - Add X% to Y. - Subtract X% from Y. - Determine what percentage X is of Y. - Track cryptocurrency values. But there’s more! We’ve added a simple, yet powerful, currency converter to enhance your calculation toolkit. Whether you need to calculate a percentage of a number, figure out a tip, add or subtract percentages – i know percent has you covered. Percentages are everywhere in daily life. Stay one step ahead with i know percent. Subscription Pricing: - 1-Month Subscription: Just $0.99 - Payment will be charged to your iTunes account upon confirmation of purchase. - Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. - Your account will be charged for renewal within 24 hours before the end of the current period, with the renewal cost identified. - Manage or disable auto-renew in your Apple ID account settings anytime after purchase. - This price applies to United States customers; pricing in other countries may vary and actual charges may be converted to your local currency based on your country of residence. Privacy Policy: https://artcoastdesign.com/privacy/ Terms of Service: ttps://artcoastdesign.com/terms/
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
Zustand
React Navigation
react-native-async-storage
TypeScript
BUILD KIT DIFFICULTY
Starter
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.
