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
Word of the Day by LookUp
Word of the Day by LookUp enables you to build your vocabulary daily through beautiful illustrations that make remembering words easy and fun.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.7
3 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.
Build your own version
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 Word of the Day by LookUp: map the core Reference 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
Incorporate a wider variety of words and themes.
Assumption to check: Users may find the content repetitive if words are not varied.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance share functionality to include social media.
Assumption to check: Limited social sharing options.
Validate with people who use this workflow before building.
Hypothesis 3
Allow offline access to favorite words.
Assumption to check: No offline access to saved words.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce tiered subscription options to cater to different user needs.
Assumption to check: Single subscription model may not appeal to all 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
Word of the Day by LookUp enables you to build your vocabulary daily through beautiful illustrations that make remembering words easy and fun. Learn Anywhere with Widgets and Shortcuts: Word of the Day by LookUp meets you where you are. You can add Word of the Day widgets to your Lock Screen, Home Screen, or Standby Mode. You can also add automations using Shortcuts to get a new word every day. Each word is accompanied by an example sentence and pronunciation, and you can learn more about it in the LookUp app, which has even more details and tools to enable better learning. Ideal for learners practicing for their SAT, GRE, TOEFL, or IELTS tests, people building their vocabulary for everyday use, or simply anyone who love to learn new words! Buy Once, Use Anywhere: Word of the Day by LookUp is available on all major platforms, including iPhone, iPad, Mac, Apple Watch, Apple TV, and Apple Vision Pro. You just need to buy the app once and you can use it anywhere. No Ads, No Subscriptions, No Hidden Costs.
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
Zustand
React Navigation
Supabase
Expo Notifications
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.
