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
Handwriting Keyboard
Quick and easy to turn your handwriting into inputted text in any app.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
96 ratings · Top 30%
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Handwriting Keyboard: map the core Utilities 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
Improve accuracy for multiple languages and dialects.
Assumption to check: Inaccurate handwriting recognition in certain languages
Validate with people who use this workflow before building.
Hypothesis 2
Offer users more customization for sensitivity and handwriting styles.
Assumption to check: Limited customization options for handwriting settings
Validate with people who use this workflow before building.
Hypothesis 3
Optimize performance for older hardware.
Assumption to check: Frequent app crashes on older devices
Validate with people who use this workflow before building.
Hypothesis 4
Implement a guided tutorial or onboarding process.
Assumption to check: Confusing user interface for first-time 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
Quick and easy to turn your handwriting into inputted text in any app. Works with any app, such as Safari, Mail, Notes, etc. MyScript® engine converts your handwriting to typed text in any app. Works offline. No need to be online to use or activate online. Compatible with Apple Pencil if your device supports it. 【HOW TO USE】 STEP 1: Install this Handwriting Keyboard (U.S. English or Japanese, or both) from "Keyboard" section in "Settings" app. Open Settings App ▶ Handwriting（This app's settings section） ▶ Keyboards ▶ Turn "English (US)" on. …or Open Settings App ▶ General ▶ Keyboard ▶ Keyboards ▶ Add New Keyboards... ▶ Choose "Handwriting" ▶ Turn "English (US)" on. STEP 2: When inputting, such as when writing a mail message, long-press "Globe Button" on the keyboard to switch to this Handwriting Keyboard. (Tap "Globe Button" to switch to a next keyboard, long-press "Globe Button" to show keyboard list.) * When inputting password, the iOS keyboard automatically switches to default keyboard. 【Note】 • For some apps that have original inputting area, such as "Slack", disable inline inputting. • If you have enabled "Scribble", the button to activate a keyboard has a bug. Please tap "3 times" to activate this keyboard from Scribble. Functionalities: [Tap gear button on the keyboard to customise] • Auto enter after customsed delay • Choose input area size from three sizes • Choose enter button location from three options • 2 finger scroll or 2 finger cursor move gesture • Supports Apple Pencil with finger touch rejection • Option to disable inline inputting • Choose three line widths, four background color • Supports Text Replacement • Supports iOS13's dark mode and floating keyboard Supported Languages: • English (U.S.) • Japanese (including hiragana to kanji conversion) This app does not recognize other languages than U.S. English and Japanese. This app does not recognise UK English. Diese App erkennt kein Deutsch. Esta aplicación no reconoce español. Este aplicativo não reconhece português. Denna app känner inte igen svenska. Cette application ne reconnaît pas le français. 이 응용 프로그램은 한글을 인식하지 않습니다. MyScript® is a trademark of MyScript
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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-native-gesture-handler
expo-clipboard
@react-navigation/native
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.
