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
Percolator: Drippy Mosaics
Transform your photos into dazzling, multicolor mosaics.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
1,145 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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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 Percolator: Drippy Mosaics: 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
Offer more unique and customizable effects.
Assumption to check: Limited effects compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image processing for better performance.
Assumption to check: Potentially slow performance with large images
Validate with people who use this workflow before building.
Hypothesis 3
Simplify onboarding and tutorials.
Assumption to check: Navigation can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 4
Ensure reliable saving and sharing options.
Assumption to check: Inconsistent save 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
Transform your photos into dazzling, multicolor mosaics. FEATURES: • Create delightful mosaics from your photos • Amazing Brews, each with their own unique look • Intuitive dial-based controls • Save to your phone or share via Instagram, Facebook, Bluesky, Mastodon, Message, Email, and more • Try it with other photo editing apps — mix-n-match! WHAT PEOPLE ARE SAYING ABOUT PERCOLATOR: • “Delightfully quirky” —NY Times • 4½ out of 5 Mice: “The animated effects throughout the app are truly impressive...” —Macworld • “The result—something like a Seurat painting rendered with Microsoft Paint’s circle tool—is unique in the app world.” —Wired App Guide • “Percolator…is a unique, well-done modernist app with a fun retro wink.” —Life In LoFi 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 Percolator, please consider leaving an App Store review or rating—we’d really appreciate it! Every review counts and helps indie developers like ourselves. :) Happy Percolating!
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
@react-native-async-storage/async-storage
react-navigation
expo-image-picker
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.
