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
LingQ | Learn Languages
Experience Language Learning with LingQ — the natural and effective way to learn a new language.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
10,184 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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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/
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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 LingQ | Learn Languages: 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 course downloads for better accessibility.
Assumption to check: Limited offline functionality for learning materials.
Validate with people who use this workflow before building.
Hypothesis 2
Streamline the navigation flow with clearer labels and paths.
Assumption to check: Some users find navigation confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer information on subscription benefits upfront.
Assumption to check: In-app purchases can be unclear.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce tailored learning experiences based on user progress and preferences.
Assumption to check: Lack of personalized learning paths.
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
Experience Language Learning with LingQ — the natural and effective way to learn a new language. LingQ is a language learning app that lets you grow your vocabulary and improve comprehension through meaningful exposure to the language with real content. Follow your interests and enjoy an immersive learning experience in over 50 languages. Learn Spanish, English, Japanese, Korean, Italian, German, Portuguese, French, Chinese, Arabic, and other languages. Trusted by Learners Worldwide: ◆4.7 star rating from over 45000 reviews. ◆Featured in CBC, Men’s Health, La Vanguardia, El País. Designed for Real Language Learning LingQ uses an input-based approach: you learn languages by reading and listening to real, interesting content at your level. ◆ Massive Content Library: Thousands of lessons from podcasts, books, interviews, videos, articles, and more — all with matching text for easy listening and reading. ◆ Follow Topics You Enjoy: Choose content you love and progress naturally through immersion, not drills. ◆ Import Your Favorite Content: Turn Netflix, YouTube, podcasts, books, and articles into personalized lessons. ◆ Powerful Reader: An effective, optimized reader that tracks every word you encounter to boost your vocabulary. ◆ Interactive Learning: Listen, read along, tap words for instant definitions, and learn naturally as you go. ◆ Advanced Progress Tracking: Monitor your listening, reading, study time, and vocabulary growth. ◆ Learn Anytime, Anywhere: Study offline and sync your progress automatically. Learn whenever you want. AI Language Learning Tools • AI Audio Transcription: Turn podcasts and audiobooks into interactive lessons. • AI Voices: Make your lessons, reviews and chats more immersive with natural sounding text-to-speech voices. • Advanced Chatbot: Get detailed tutor responses and real-time web search with our advanced Lynx AI Chatbot. • AI-Simplified Lesson: Take advantage of more interesting content earlier on in your learning journey by generating simplified versions of lessons. Read and Listen with Interactive Tools • SRS vocabulary review for long-term retention; • Mini Stories that build a strong foundation at any level; • Grammar guides with clear, accessible explanations; • Audio playlists for hands-free listening; • Karaoke Mode to follow the text while listening; A Global Community to Support You • Writing Exchange for real corrections from native speakers; • Tutoring sessions tailored to your goals; • Community forum for questions, guidance, and motivation; • Challenges that help you stay consistent and build strong habits; Built by Language Learners LingQ was co-founded by Steve Kaufmann, a polyglot who learned more than 20 languages using this same natural approach. Learn Multiple Languages LingQ supports more than 50 languages, including Spanish, English, Japanese, Korean, Italian, German, Portuguese, French, Chinese, Arabic and more. Get LingQ Premium and Accelerate Your Learning • Unlimited vocabulary lookup and SRS review; • Comprehensive word tracking to boost your progress; • Unlimited content imports; • Access to AI features; Start learning from real content. Download LingQ and begin today. Feedback? Let us know. Send suggestions and feedback to [email protected]. Terms of Service - https://www.lingq.com/terms/
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.
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BUILD KIT DIFFICULTY
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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.
