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
SpeakEasy Japanese Phrasebook
SpeakEasy Japanese is an offline Japanese phrasebook for travel, pronunciation, and quick everyday reference.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
56 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 included17 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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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 SpeakEasy Japanese Phrasebook: map the core Travel 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
Expand categories to include more niche phrases.
Assumption to check: Limited phrases for specific scenarios
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to create and save their own phrases.
Assumption to check: No user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Implement better audio management for background playback.
Assumption to check: Audio playback issues in background
Validate with people who use this workflow before building.
Hypothesis 4
Introduce quizzes or games to reinforce learning.
Assumption to check: Lack of interactive elements
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
SpeakEasy Japanese is an offline Japanese phrasebook for travel, pronunciation, and quick everyday reference. It combines native-speaker audio, phonetic spellings, favorites, flashcards, and a built-in translator for one-off phrases. Designed for English-speakers traveling in Japan, it helps you ask essentials, understand replies, and get around with more confidence without relying on a data connection. Browse by category or search in seconds for restaurants, transportation, shopping, hotels, sightseeing, emergencies, and more. Practice before you go with flashcards, save your most-used phrases as favorites, and keep practical travel Japanese close at hand. FEATURES • Over 1,000 essential travel phrases with both Japanese and phonetic translations plus audio. Some content requires in-app purchase. • Audio clips recorded by a native speaker to help you perfect your pronunciation. • Flashcards with English on one side and Japanese on the other side, that you can use to study and test yourself. • Built-in translator to translate those one-off phrases you need. Unlimited use requires in-app purchase. • Slow-play feature that plays audio at a slow speed to assist learning. • Search facility to instantly find the phrase you’re looking for. • Favorites feature to provide fast access to your favorite phrases. • Supports dark mode and light mode. • Dynamic type (large font) support. • Support for US English, UK English and Canadian English spelling. • No internet connection required. The app will work no matter where you are. INCLUDES PHRASES SUCH AS: • Where is the restroom? • Are you married? • Let’s go to a restaurant • Do you speak Japanese? • I don’t speak Japanese • Do you understand me? • Call a doctor! • I’ve run out of medication • I need the consulate • How do I get to the … ? • How much does a ticket cost? • When is the next museum tour? • Please call a taxi • How much does it cost? • Where is luggage check-in? • Where can I rent a car? • My car has broken down • Can I see the menu? • Do you have a menu in English? • What do you recommend? • For dessert, I’ll have … • That was delicious! • Do you accept credit cards? • A glass of red wine • Where can I buy … ? • How much does this cost? • Can I try this on? • I need a hotel … • I have a reservation • I have lost the room key • What time is check-out? • Where is the nearest bank? • What is the exchange rate? • What time is it? • Can I get a cash advance? • You are very pretty • You are very handsome • What is your telephone number? • I will miss you • Thanks for the evening ---------------- Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Axios
react-navigation
expo-av
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.
