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
T9 Keyboard - Text Like Its 04
T9 Keyboard brings classic phone keypad typing back to iPhone and iPad.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 T9 Keyboard - Text Like Its 04: 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
Offer a wide range of themes and customization options.
Assumption to check: Limited customization options for keyboard appearance
Validate with people who use this workflow before building.
Hypothesis 2
Include a tutorial or demo mode to guide users.
Assumption to check: Difficulty adapting to T9 layout for new users
Validate with people who use this workflow before building.
Hypothesis 3
Implement predictive text to enhance typing speed.
Assumption to check: Lack of predictive text or autocorrect features
Validate with people who use this workflow before building.
Hypothesis 4
Add multilingual support for a broader audience.
Assumption to check: No support for multiple languages
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
T9 Keyboard brings classic phone keypad typing back to iPhone and iPad. Type with a familiar 12-key layout inspired by old-school mobile phones. Tap 2 for A, B, C, tap 3 for D, E, F, and keep cycling through letters and numbers just like classic multi-tap texting. Built as a real iOS keyboard extension, T9 Keyboard works in most text fields across your device once enabled in Settings. It includes a bold retro keypad design, strong haptic feedback, delete, return, shift, space, punctuation, and the globe key for switching keyboards. The app also includes a 30-second T9 typing challenge so you can test your speed and see how fast your thumbs still are. Features: - Classic 12-key phone keypad layout - Multi-tap letter cycling - Numbers, punctuation, space, shift, delete, and return - Strong haptic feedback - Works as an iOS custom keyboard - Built-in T9 typing speed challenge - No full keyboard access required Perfect for anyone who misses classic texting, wants a retro keyboard, or just wants a fun alternative way to type on iPhone or iPad.
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
react-native-gesture-handler
expo-color-picker
react-native-slider
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.
