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.
The Fast, Clean, and Accurate Percentage Tool for Business & Daily Use
$0.49 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Percentage Pro - No Ads: map the core Business workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited functionality compared to more feature-rich calculators
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Users may find the UI simplistic
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase complexity
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of data export options
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
The Fast, Clean, and Accurate Percentage Tool for Business & Daily Use Percentage Pro is the clean, powerful, and ad-free percentage calculator designed for professionals, students, and anyone who demands speed and precision. Whether you’re calculating markups, discounts, tax rates, or stock changes, this app is your reliable daily driver. Why Choose Percentage Pro? Blazing Fast & Intuitive: Get instant results with an ultra-clean, straightforward interface that makes complex percentage calculations simple. The design is simple, elegant, and perfect for quick use during meetings or on the go. 100% Ad-Free: Enjoy a premium, uninterrupted experience. There are no banner ads, no video ads, and no distractions—just pure calculation power. Great for Business: Ideal for finance, retail, and sales professionals. Quickly handle all core business calculations: "What is X% of Y?" (e.g., calculating a discount or commission). "X is what percent of Y?" (e.g., determining profit margin or tax rate). Percentage Change (e.g., tracking month-over-month growth, stock increase/decrease). Maximum Precision: Supports up to 8 decimal places of precision, giving you the accuracy you need for detailed financial, scientific, or complex business reports. Smart, Seamless Features: Input Swap Button: Effortlessly switch your 'Part' and 'Whole' inputs in the "X is % of Y" and "Change" views. Auto-Save: Your last inputs are automatically saved, so you never lose your progress. Tap-to-Copy: Instantly copy the result to your clipboard with a single tap. Clear All: One-tap button to wipe the slate clean and start fresh. Core Calculations Included: X% of Y: Find the value of a percentage. X is % of Y: Find the percentage of a value. Percentage Change: Calculate the increase or decrease between two numbers.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.