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
Popsicolor: Tasty Watercolors
Turn your photos into mouthwatering illustrations.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
332 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Popsicolor: Tasty Watercolors: map the core Photo & Video 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
Offer more diverse and customizable filters.
Assumption to check: Limited filter options compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image processing for faster export.
Assumption to check: Exporting can be slow
Validate with people who use this workflow before building.
Hypothesis 3
Implement batch editing for multiple photos at once.
Assumption to check: No batch editing feature
Validate with people who use this workflow before building.
Hypothesis 4
Provide onboarding tutorials to guide new users.
Assumption to check: Lack of user tutorials
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
Turn your photos into mouthwatering illustrations. FEATURES: • Amazing watercolor & ink effects • Simple, spontaneous, and fun to use • Save your illustrations and share them via Instagram, Facebook, Bluesky, Mastodon, Message, Email, and more • From Tinrocket, creator of Waterlogue (App Store Best of 2014), This by Tinrocket (App Store Best of 2016), and Olli (App Store Best of 2017) WHAT PEOPLE ARE SAYING ABOUT POPSICOLOR: • “If you are bored of the traditional photo filter stuff, then give Popsicolor a whirl. It will definitely make your photos pop.” —AppAdvice.com • “There’s nothing quite like it in the App Store.” —Life in LoFi: iPhoneography • “Watercolors that actually look good.” —Cult of Mac KEEP UP WITH TINROCKET: • Follow @Tinrocket on Instagram for the latest! • We’re here to help: If you have a question or need assistance, you can always email us at [email protected] • If you like Popsicolor, please consider leaving an App Store review or rating—we’d really appreciate it! Every review counts and helps indie developers like ourselves. :)
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
react-native-reanimated
expo-sharing
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.
