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
WordBook (Universal)
FEATURES that make WordBook stand out from other dictionary apps:
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
275 ratings · Top 15%
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 included18 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 WordBook (Universal): 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
Implement a robust offline mode with local caching.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Add features like user-defined word lists and learning paths.
Assumption to check: Lack of user personalization features
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process and provide clear value for premium features.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Optimize search algorithms for faster results.
Assumption to check: Search speed can be slow
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
FEATURES that make WordBook stand out from other dictionary apps: - Professionally recorded pronunciation for every single entry - Word origin information (Etymologies) - Built-in spell checker with pop-up spelling suggestions - User's bookmark and note management - Unmatched sounds-like and wild card search and a powerful word puzzle solver ==================================== WordBook is a comprehensive, quick and intuitive dictionary and thesaurus of the English language. It's a great combination of comprehensive contents and fast intuitive interface. FEATURES: * 150,000 entries with more than 220,000 definitions, 70,000 usage samples * 23,000 root word origins (etymologies) * 120,000 pronunciation guides in International Phonetic Alphabet (IPA) and other notations * Spoken pronunciations (for all entries) * Built-in thesaurus and word links connecting words semantically * Unmatched index, wildcard, anagram search capabilities * Bookmark (with user's notes) and history management * Words of the Day: you get to learn new words daily, shake the device for new random words * Browser-like definition content navigation, ability to tap on any word in the content to look up its definition * Extending up to 5 web dictionaries to supplement built-in contents * High resolution graphics for Retina display REVIEWS: * "Mobile dictionary and thesaurus at my fingertips. Lightning fast. The random words of the day are a terrific bonus" - Dane Cook, The Daily * “the best in the [inexpensive dictionary] category... This wealth of information is indispensable to the student, and even fun to use” - Jeff Phillips, Macworld * “One of 15 Best Apps for English Majors” - April Lentini, CollegeTimes.us * “None measure up to WordBook” Score: 10/10 - Michael Alexander, AppCraver.com * “WordBook leads the parade of free and low-cost dictionary options” - Ben Boychuk, MacWorld.com * “WordBook dictionary - the standard for reference apps” Rating: 5/5 - Steven Yaccino, appolicious.com NOTES: - WordBook does not required an internet connection except to view web dictionaries or to play online pronunciation voices. - WordBook includes entries of both American/British spellings. Definitions are written in American English.
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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
AsyncStorage
React Native Vector Icons
React Native Share
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.
