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
Superfluent: Language Learning
Explore real cities, and practice hundreds of real-world conversations: Superfluent is the most immersive way to learn a language
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
1,557 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 Superfluent: 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
Expand course offerings to include niche languages.
Assumption to check: Limited language options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement forums or chat for users to connect.
Assumption to check: Lack of community features for peer interaction.
Validate with people who use this workflow before building.
Hypothesis 3
Standardize content creation process.
Assumption to check: Inconsistent content quality across lessons.
Validate with people who use this workflow before building.
Hypothesis 4
Add badges, XP, and levels for user motivation.
Assumption to check: No gamification elements to increase engagement.
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
Explore real cities, and practice hundreds of real-world conversations: Superfluent is the most immersive way to learn a language. You’ll master new skills, get instant feedback, and experience speaking a language where it’s actually lived. Stop studying. Start exploring. Real conversations, real places: * Language immersion from the comfort of your couch. Practice the moments you’ll actually face in real life - as if you were really there. Hundreds of scenarios: * Follow curated routes to build new skills, or explore the map to practice speaking all around a country. 24/7 Language Tutor: * Get instant, thoughtful feedback, and help as you explore. Improve your pronunciation, phrasing, and confidence in real time to level-up your language skills faster than ever before. Make visible progress: * Track your progress on the map as you complete curated learning routes and visit the most interesting places in France, Germany, Spain, etc. Build confidence quickly * Get comfortable in real scenarios without the stress - the closest thing to being there in real life. Download the app for free today and practice speaking any of the following languages: Spanish (Mexico and Spain), English (England and the USA), French, German, Italian, Portuguese (Brazil and Portugal), and more languages will be coming soon. You can upgrade to Superfluent Pro or stick with the free version of the app instead. It's up to you. Either way, we're here to help you reach your fluency goals. ---------------- Superfluent Pro Subscription: By subscribing to Superfluent Pro, you'll have unlimited access to all Superfluent content. We have monthly and annual plans for the Superfluent Pro subscription. We also offer a Family Plan subscription if you want to share Superfluent Pro with up to 5 other people. Your Apple account will be charged for payment when you confirm the start of your subscription. The subscription will automatically renew unless canceled at least 24 hours before the end of the current billing cycle. You can cancel the renewal at any time by going to the settings in your Apple account. Terms of Service: https://superfluent.com/terms Privacy Policy: https://superfluent.com/privacy
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
Supabase
Zustand
React Navigation
BUILD KIT DIFFICULTY
Advanced
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.
