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
Coton
Coton is also on iPad: http://itunes.apple.com/app/id509851679
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
13 ratings · Top 50%
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/
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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 Coton: map the core Reference 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
Provide comprehensive details and care instructions for each type.
Assumption to check: Limited information on some cotton types
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more intuitive navigation structure with clear labels.
Assumption to check: Navigation can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Ensure a consistent design language throughout the app.
Assumption to check: Inconsistent design across screens
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline access to cotton information for users.
Assumption to check: No offline functionality
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
Coton is also on iPad: http://itunes.apple.com/app/id509851679 /!\ Only available in English and French! Coton is a beautiful cloud identification app for your iPhone and iPod Touch. Identify clouds by browsing stunning pictures and detailed descriptions of all the different types of clouds you may spot. Coton relies on the International Cloud Atlas classification, the authoritative book from the World Meteorological Organization. Learn about cloud types and their corresponding weather forecast including chances of rain and storm. Try to figure out the weather of the day, just by looking at the sky! Coton includes: - 33 cloud index cards for the main cloud genera, species, varieties and special clouds - a gallery containing more than 120 awesome pictures - an illustrated guide which simply explains what is a cloud and how clouds are classified - a chart of the 10 cloud genera - a setting allowing you to switch between metric and imperial measurement system The only thing you'll have to do is looking up... Enjoy your spottings! Just remember: "It is rare that a cloud gets the shape of a cloud." Ylipe
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
Supabase
React Navigation
Axios
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.
