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
Lingo Legend Language Learning
Learn a language while gaming! Master over 3000 of the most important words and phrases in an immersive fantasy world
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
3,742 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 included18 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 Lingo Legend Language Learning: 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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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 offline downloads for courses.
Assumption to check: Limited offline functionality for course materials
Validate with people who use this workflow before building.
Hypothesis 2
Enhance progress tracking with detailed stats and visualizations.
Assumption to check: Difficulty in tracking long-term progress
Validate with people who use this workflow before building.
Hypothesis 3
Add forums or chat features for peer learning.
Assumption to check: Lack of community features for learner interaction
Validate with people who use this workflow before building.
Hypothesis 4
Implement a review system for user feedback on course quality.
Assumption to check: Inconsistent content quality across courses
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
Learn a language while gaming! Master over 3000 of the most important words and phrases in an immersive fantasy world. Crush your learning goals and your enemies! Test your language skills in strategic monster battles. Draw ability cards from a personalized deck and answer language flashcards to play them. Developed by language acquisition experts, Lingo Legend contains over 200 categories of grammar, vocabulary, and common phrases to learn from. It’s the perfect app to compliment or kick-start your language learning journey. Gameplay - Collect cards, choose your strategy, and build your deck - Embark on a perilous journey, meet captivating characters, and complete quests - Play as a customizable avatar with unique gear to collect and equip - Explore a beautiful, dynamic, and mysterious world - Find recipes, gather materials, and craft gear to gain experience and style - Customize your camp with tons of unlockable content Supported Languages - French - Spanish - Japanese - Korean - Mandarin Chinese - German - Italian - Portuguese (Brazilian & European) Education - Developed by language acquisition experts passionate about keeping people engaged in learning a language - Learn words and phrases that are relevant with content organized around useful themes like Ordering Food and Meeting New People - Ensure long-term retention by reviewing content when needed using our spaced-repetition algorithm - Define your learning path and practice what you want, when you want In-Game Subscriptions You can enjoy Lingo Legend for a limited time every day for free. Additional daily gameplay requires a subscription 1 Month - $9.99 USD 3 Months - $21.99 USD Lifetime - $89.99 USD Payment will be charged to your Apple Account at confirmation of purchase. Subscriptions will auto-renew unless cancelled at least 24 hours before the end of the current period. No cancellation of the current subscription is allowed during the active subscription period. Have questions? Want to connect with us? Contact support - [email protected] Join Discord - https://discord.gg/TzWJSfzf4R Follow on Twitter - https://twitter.com/LingoLegend Privacy Policy - https://www.lingolegend.com/privacy-policy Terms of Use - https://www.lingolegend.com/terms-of-use
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
Supabase
react-native-video
expo-router
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.
