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
Visual Vietnamese Keyboard
Write Vietnamese in any text app using direct visual input!
$5.00 · In-app purchases
PRICE
$5.00
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.9
11 ratings · Top 50%
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/
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 Visual Vietnamese Keyboard: map the core Productivity 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
Implement user-friendly tone and diacritic aids that enhance typing speed.
Assumption to check: Limited support for advanced Vietnamese typing features.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to personalize key arrangements and themes.
Assumption to check: Inability to customize keyboard layout.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a free trial period or tiered pricing for different features.
Assumption to check: High price point for a specialized keyboard.
Validate with people who use this workflow before building.
Hypothesis 4
Implement cloud sync to save user preferences across devices.
Assumption to check: Lack of cloud synchronization for settings.
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
Write Vietnamese in any text app using direct visual input! Tired of pressing vowel keys, holding until a menu shows up, and then sliding your finger to the desired character? Tired of cryptic shortcuts? The keyboard provided by this app has separate keys for all Vietnamese base characters and tone marks, so that you can tap them quickly and move on. No auto-correction means you can mix English and Vietnamese as you wish. Use the keyboard to write in Safari, Messages, Mail, Notability, Pages, and more. Installation instructions are included. The keyboard and iOS are designed to protect your privacy: The keyboard can send text you type only to the app within which it is used; nowhere else. It does not access any other of your data.
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
Zustand
react-native-reanimated
expo-av
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.
