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
GoldRatio
GoldRatio is a program for ratio charts
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 GoldRatio: 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 tracking cryptocurrency and real estate investments.
Assumption to check: Limited features for tracking investments
Validate with people who use this workflow before building.
Hypothesis 2
Integrate with banking APIs for automatic transaction categorization.
Assumption to check: No automatic transaction import
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with basic features available for free.
Assumption to check: High upfront cost for some users
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed reports and insights on spending patterns and investment performance.
Assumption to check: Lack of detailed analytics
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
GoldRatio is a program for ratio charts. Ratios are a powerful tool to compare the performance of two assets over a certain period of time. The program calculates ratio charts of 60 different values (commodities, currencies, indexes, stocks and bond futures). For example the gold/silver ratio or the dow/oil ratio. Every combination is possible, even more exotic charts like for example the price of apple shares in soybeans. The app can also be used to calculate commodity price charts in various currencies. (F.e.: The silver/euro ratio is the price for silver in euro) Two ratios can be compared in the same chart. The charts can be displayed with absolute ratio values or with percent values. In percent mode both charts start at 100% Depending on the data up to 12 different time frames between 45 days and 180 years can be calculated. 38 Days, 200 Days or 10 Years averages can be shown, too. GoldRatio2 stores the settings for 15 different ratio charts (Bookmarks). You can scroll through the charts by dragging them with your finger from left to right. The program is resolution independent and takes full advantage of iPad or retina screen resolutions. It works in portrait or landscape mode. Commodities: Gold, Silver, Platinum, Palladium, Crude Oil WTI, Crude Oil Brent, Heating Oil, Gasoline, Natural Gas, Copper, Cotton, Corn, Cocoa, Coffee, Orange juice, Sugar, Soybeans, Oats, Rice, Beer, Live catle Indexes: DOW, DAX, Hang Seng, Nikkei, CAC40, SMI, S&P100, S&P500, US Dollar, XAU, HUI, EURO M1 - M3, GLD Inventory, Human Population, VIX, VDAX Currencies: Australian dollar, Canadian dollar, Swiss franc, Euro (+ M1 - M3), Pound sterling, Indian rupee, Chinese yuan renminbi, Russian rouble, US dollar, Japanese yen, Bitcoin Bond Futures: US 30 Years Futures, US 10 Years Futures Some user reviews from various countries: 'Wonderful' by owneroftheworld - Version 1.0 - 4 February 2011: I have waited for this app. Invaluable. I don't know of another source that provides this information this well and this easy to use. Thank you thank you thank you. I really need this. Well done. Anyone seriously interested in precious metals must get this. 'Great app!' by Globetrotter12 - Version 1.5 - 29 April 2011: This app works very intuitive and is easy to use. Ratio's are very broad. Personally I would like to include the consumer price index (for some major economies) as a ratio, perhaps this can be done in a future version. 'Very good' by Matrix7719 - Version 2.0 - 19 September 2011: Very good app. Important to follow prices of precious metals. Including french CAC 40 and US real estate and those of Europe, China would complementary. thank you
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.
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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.
