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
Inssatem - Emoji & Fonts
Copy cute text emojis and fancy fonts with just one tap — use them anywhere!
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
41 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'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 Inssatem - Emoji & Fonts: map the core Social Networking 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 a larger library of unique and customizable emoticons
Assumption to check: Limited emoticon selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear explanations and previews of premium content
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Ensure smooth integration with the keyboard and user settings
Assumption to check: Keyboard integration can be glitchy
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and upload their own emoticons
Assumption to check: Limited customization options for 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
Copy cute text emojis and fancy fonts with just one tap — use them anywhere! Inssatem is an all-in-one keyboard app with over 1,000 text emoticons and a variety of Korean and English fonts. ◆ Huge Emoji Collection Browse adorable text emoticons organized by category. Bears, bunnies, flowers, hearts — find the perfect emoji for every moment and copy it instantly. ◆ Save Your Favorites Add frequently used emojis to your favorites list for quick access anytime. ◆ Custom Categories Create your own emoji collections! Organize emojis by theme, mood, or occasion. ◆ Beautiful Korean & English Fonts Transform plain text into something special. Choose from a variety of Korean and stylish English fonts to decorate your Instagram bio, messages, and social media posts. ◆ Keyboard Extension Add the Inssatem keyboard and use emojis directly in any app — KakaoTalk, Instagram, LINE, iMessage, and more. ◆ Clean Experience We keep ads to a minimum so you can enjoy a smooth, distraction-free experience. Make your messages more fun and unique with Inssatem!
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
Redux
Axios
React Navigation
AsyncStorage
BUILD KIT DIFFICULTY
Starter
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.
