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
Vocabulary - Learn words daily
The word of the day is now on your phone
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
221,778 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.
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 included17 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 Vocabulary - Learn words daily: map the core Education 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
The word of the day is now on your phone. Vocabulary helps you sound ludicrously articulate without trying too hard. Whether you love books, writing, speaking, or you just want to feed your curiosity with big words, this app is for you. Ready to elevate your word power? The key to successfully expanding your vocabulary is learning new words in a way that stimulates your attention. Studies show that the most effective way of learning new words is with an app that’s specifically designed for that. With the Vocabulary app, you can: - Learn new words with minimal time investment, simply scrolling through your phone - Choose your own level of difficulty, based on your current English language mastery - Select Vocabulary categories that best suit your needs and interests - Speak and write more concisely and confidently, with the right word at your fingertips - Meet your linguistic goals at your own pace - Customize the app’s features and make it work for you The Vocabulary app will turn learning and retaining new words into a fun activity that will allow you to “wow” your friends and co-workers. Privacy Policy: https://monkeytaps.net/privacy Terms of use: https://monkeytaps.net/terms
Written user reviews are not shown here. Check current App Store reviews >
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 a feature to suggest related words and usage in sentences.
Assumption to check: Limited word selection and contextual usage examples
Validate with people who use this workflow before building.
Hypothesis 2
Include options to share progress or favorite words on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement AI-driven personalized word recommendations based on user performance.
Assumption to check: Lack of personalized learning paths
Validate with people who use this workflow before building.
Hypothesis 4
Design a more subtle, timed approach to introduce premium features.
Assumption to check: In-app purchase notifications can be intrusive
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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
React Navigation
React Native Reanimated
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.
