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
Emoji Maker: Emoji Up
Emoji Up is an emoji maker that lets you create your own custom emojis.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
64,189 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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What's included15 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 Emoji Maker: Emoji Up: 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 shapes, colors, and stickers.
Assumption to check: Limited customization options for emojis
Validate with people who use this workflow before building.
Hypothesis 2
Implement better categorization and sorting features.
Assumption to check: Difficult to save and organize created emojis
Validate with people who use this workflow before building.
Hypothesis 3
Reduce ad frequency or offer an ad-free premium version.
Assumption to check: Frequent ads interrupt user experience
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance and reduce resource usage.
Assumption to check: Inconsistent performance on older devices
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
Emoji Up is an emoji maker that lets you create your own custom emojis. Have fun mixing and matching with endless combinations! Inside Emoji Up, you'll find tons of emoji and sticker packs you can share across all your social apps FEATURES of Emoji Up: - Show off your creativity with a range of customisation options that will make you feel like a real cat artist - Create your own personal collection of emoji, like a treasure trove full of snacks that even I could not ignore - Discover all the emoji packs, more surprising than a well-seasoned pizza - Play the Emoji Puzzle to win the 'Mystery Emoji Puzzle'. More intriguing than an afternoon nap - Export and use emoji on your favourite social networks and let everyone know you are an emoji master! Ready for this emoji adventure? It will be more exciting than finding the fridge full... Let's go! ----------- SUBSCRIPTION INFO: Subscribe to unlock all emojis packs and unlock all emoji items. Every week we will add new emoji items and new emojis packs. • Subscription duration: weekly • Payment will be charged to your iTunes account as soon as you confirm your purchase. • You can manage your subscriptions and disable automatic renewal from your account settings. • The cost of renewal will be charged to your account in the 24 hours prior to the end of the current period • When you disable a subscription, the subscription will be active until the end of the period • Automatic renewal will be disabled, but your current subscription will not be refunded. Terms of service: https://tally.so/r/LZ9aD2 Privacy and Policy: https://tally.so/r/Nprbop
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
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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.
