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
Typewrite – Virtual Typewriter
Typewrite is a distraction free writing machine that fits in your pocket
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
4 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 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 Typewrite – Virtual Typewriter: 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
Add document organization features like folders or tags.
Assumption to check: Limited features compared to traditional word processors
Validate with people who use this workflow before building.
Hypothesis 2
Implement an easy-to-use formatting toolbar with clear icons.
Assumption to check: Text formatting can be cumbersome on mobile
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a sharing feature for collaborative editing.
Assumption to check: No collaborative features
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free tier with limited features to attract more users.
Assumption to check: Pricing can deter users for simple functionality
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
Typewrite is a distraction free writing machine that fits in your pocket. Its sleek and minimalist design will keep you focused, while still providing all the important features you need. With a wide range of customization options to chose from, you can craft the perfect environment to suit your writing style. Optional typewriting sound-effects are even included for some added old-fashioned ambiance! Whatever your project may be, Typewrite can help you get your ideas out of your head and onto the page. And once they're there, everything is easily exportable so you can continue revising on your computer in your favorite programs. Take a look at some of Typewrite's great features: - Typewriter sound effects: optional typing sounds help you find your flow - Font customization: choose from a variety of fonts and styles - Project export: export as a plain text file, editable by other writing apps - Autosave: projects saved automatically as you go, so you never lose your work
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 Navigation
Expo Font
React Native Async Storage
React Native Share
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Zustand
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.
