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
HelloChinese - Learn Chinese
HelloChinese is the best Mandarin Chinese learning app for beginners!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
23,850 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 HelloChinese - Learn Chinese: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
HelloChinese is the best Mandarin Chinese learning app for beginners! Featured on the App Store in New Apps We Love and Notable Education Apps! Designed in a fun and highly effective manner, HelloChinese helps you rapidly learn Mandarin Chinese from scratch to a conversational level. With HelloChinese, learners can "learn the Chinese language, explore Chinese culture" – you will not only learn Mandarin Chinese but also enjoy the process of delving into the culture intertwined with the language. Features: ◉ Game-based Chinese learning: You will never get bored. ◉ 1000+ graded stories: read engaging stories at your level! ◉ Immersive lessons help you to have real-life, practical conversations quickly. ◉ Over 2,000 videos - all featuring authentic Chinese speakers! ◉ Innovative self-adaptive learning games that incorporate Chinese cultural education. ◉ Speech recognition corrects your pronunciation and makes speaking Chinese a breeze. ◉ Handwriting specially designed to learn Chinese characters at a faster rate. ◉ Systematic courses based on HSK levels. ◉ A well-designed Pinyin (pronunciation) course for newbies. ◉ Bite-sized curriculum to fortify your Chinese listening, speaking, reading, and writing skills. ◉ Simplified and traditional Chinese(Mandarin) are both supported. ◉ Offline accessibility: Once a course is downloaded, no internet connection is required. ◉ Study progress tracking across multiple devices. With these tools at your disposal, nothing can stop you from mastering Chinese. Start on your path to fluency today! HelloChinese Premium offers: One-month subscription for $11.99 Three-month subscription for $25.99 Twelve-month subscription for $69.99 The above prices are for U.S. customers. Pricing in other countries may vary, and charges may be converted to your local currency depending on your country of residence. Once purchased, subscriptions automatically renew unless auto-renew is turned off in your iTunes Account settings at least 24 hours before the end of the payment period. Facebook: https://www.facebook.com/HelloChineseApp/ Privacy Policy: https://www.hellochinese.cc/privacy.html Terms of Use: https://www.hellochinese.cc/terms.html Premium users can always reach us at [email protected] if they need any help.
Written user reviews are not shown here. Check current App Store reviews >
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
Ensure all lessons can be downloaded for offline use.
Assumption to check: Limited offline access to lessons
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the paywall and clarify features of each subscription tier.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Introduce community features for users to connect and practice together.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Add a guided onboarding experience to help beginners navigate the app.
Assumption to check: Overwhelming content for beginners
Validate with people who use this workflow before building.
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
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.
