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
Midtone
Unleash Your Creativity with Midtone!
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Midtone: map the core Graphics & Design 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
Introduce advanced editing tools and filters.
Assumption to check: Limited editing features compared to desktop applications
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image processing algorithms.
Assumption to check: Performance issues with large images
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more streamlined interface.
Assumption to check: User interface may feel cluttered with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Add options for sharing and collaborating on edits with others.
Assumption to check: Lack of collaboration features
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
Unleash Your Creativity with Midtone! Tired of generic color palettes? Midtone is a unique and powerful color tool that generates a rich spectrum of hues from just three base colors. See your colors blend seamlessly in a beautiful hexagonal grid, giving you a true feel for the "midtones" and transitions in your palette. Whether you're a painter, a digital artist, a UI/UX designer, or a developer, Midtone is the perfect companion for your next creative project. Key Features: Dynamic Color Mixing: Start with three colors (Primary, Secondary, and Tertiary) and watch as Midtone generates a full 15-color palette, showing you every step of the blend. Powerful Color Sourcing: Find your perfect base colors from anywhere: Image & Camera: Extract dominant colors from your photos or use your camera to capture inspiration from the world around you. Color Wheel: Pick a precise color with a classic wheel picker. Sliders: Fine-tune your shades with precise HSV and RGB sliders. Color Theory Methods: Instantly create harmonious palettes using built-in methods like Monochromatic, Analogous, Triadic, and Split-Complementary. Save & Organize: Save your favorite palettes to your personal library, complete with presets to get you started. Share with Ease: Share your creations as a beautiful image (PNG), a web-ready HTML file, or as raw JSON data for your projects. Built for Creatives: A clean, intuitive interface that works beautifully in both portrait and landscape, on phone or tablet. Fully Customizable: Switch between HEX/RGB display modes and HSV/RGB color sliders to fit your workflow. Localized and Accessible for our global audience. Download Midtone today and explore a new world of color!
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
react-navigation
expo-image-picker
expo-file-system
Zustand
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.
