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
Ebru: Marbling Art Studio
Ebru is the ancient Turkish art of painting on water
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 Ebru: Marbling Art Studio: map the core Lifestyle 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
Enhance the drawing tools and features for a richer experience.
Assumption to check: Limited features for creating art compared to desktop applications.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing and user interaction features.
Assumption to check: No community sharing or interaction features.
Validate with people who use this workflow before building.
Hypothesis 3
Add guided tutorials for better onboarding.
Assumption to check: Lack of tutorials or guidance for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Offer customization options for the UI to enhance user engagement.
Assumption to check: Minimalistic design may not appeal to all 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
Ebru is the ancient Turkish art of painting on water. Drop pigment onto a shimmering tray, then comb, rake and swirl it into impossible patterns — all reborn on iPhone and iPad as a real-time fluid simulation powered by Metal. No two marblings are ever the same. — TRADITIONAL TOOLS, REIMAGINED — • Battal — the classic random splash • Gelgit — sweeping parallel tines • Şal (Shawl) — woven diamond waves • Dalga — ripple and wave patterns • Hatip — radial flower bursts • Stylus, vortex and custom combs — BUILT FOR APPLE PENCIL PRO — Natural pressure, tilt and Pencil Pro haptics make every stroke feel like a real bristle dragging through ink. Works beautifully with your finger, too. — REAL-TIME WATER PHYSICS — A custom Metal shader pipeline simulates pigment diffusion, surface tension and fluid displacement up to 16,000+ drops — smoothly, at 120 Hz on ProMotion displays. — MAKE IT YOURS — • Unlimited undo / redo • Hand-picked historical palettes + custom colours • Elegant frames: classical, minimal, marbled edge • Save works to your private gallery • iCloud sync across all your devices • Export to Photos in high resolution • 4K export available Whether you want to meditate for ten minutes, study a 500-year-old craft, or create a cover image no algorithm will ever reproduce — Ebru turns your device into a living paper bath. Dip. Comb. Lift. Breathe. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy:https://apps.cihat.dev/ebru/privacy-policy/
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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
Firebase
redux
react-navigation
react-native-reanimated
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.
