App Overview

Handwriting Keyboard icon

Handwriting Keyboard

Catalystwo · Utilities

Write by hand

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
97 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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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.

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.

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

> SELECT BUILD PLATFORM:

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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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Write by hand. Type in your apps. Handwriting Keyboard lets you enter text with your finger or Apple Pencil in apps such as Messages, Mail, Safari, and Notes. Recognition runs entirely on your device, so the keyboard works offline. Full Access is not required. Your input is not transmitted, and the app does not collect data. IMPORTANT — SUPPORTED LANGUAGES Handwriting recognition supports U.S. English and Japanese only. Other languages, including British English, are not supported. HOW TO GET STARTED 1. Open the Handwriting Keyboard app and tap “Open Settings.” 2. Tap “Keyboards,” then enable English (US), Japanese, or both. Full Access is not required. 3. In a text field, touch and hold the keyboard switch key, then select Handwriting. When entering a password, iOS automatically switches to the system keyboard. If text is duplicated or does not appear correctly in an app with a custom text field, turn off Inline Input in Handwriting Keyboard settings. FEATURES • Three writing layouts: Free, Rows, and Boxes • U.S. English handwriting recognition • Japanese handwriting recognition with hiragana-to-kanji conversion • Write with your finger or Apple Pencil • Palm rejection when using Apple Pencil • Works entirely offline • No Full Access required • Scribble over part of your handwriting to erase it • Strike through handwriting to erase it together • Drag recognition candidates together to combine them • Adjustable auto-enter delay • Three writing-area sizes • Customizable Return key position • Two-finger scrolling or cursor movement • Adjustable line width and background color • Text Replacement support • Dark Mode and floating keyboard support • Quick Notes home screen widget SUPPORTED RECOGNITION LANGUAGES • U.S. English • Japanese British English and all other languages are not supported. Deutsch wird nicht unterstützt. El español no es compatible. O português não é compatível. Svenska stöds inte. Le français n’est pas pris en charge. 한국어는 지원되지 않습니다. MyScript® is a trademark of MyScript.

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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.

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.

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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.