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
Viettel Tammi
Chào mừng bạn đến với Tammi – người bạn đồng hành số giúp cuộc sống của bạn và gia đình trở nên nhẹ nhàng, hài hòa hơn
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 2.9
110 ratings · Below Average
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 included15 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 Viettel Tammi: map the core Business 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
Add more features like bill tracking and reminders.
Assumption to check: Limited functionality compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Streamline UI for better usability.
Assumption to check: User interface is cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Optimize backend calls and UI rendering.
Assumption to check: Slow performance during peak times
Validate with people who use this workflow before building.
Hypothesis 4
Implement in-app support chat for quick help.
Assumption to check: Poor customer support experience
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
Chào mừng bạn đến với Tammi – người bạn đồng hành số giúp cuộc sống của bạn và gia đình trở nên nhẹ nhàng, hài hòa hơn. Chỉ với một ứng dụng, bạn có thể trải nghiệm đầy đủ những nhu cầu, tiện ích dịch vụ thiết yếu của đời sống. Chúng tôi tin rằng công nghệ chỉ thực sự có ý nghĩa khi giúp bạn tiết kiệm thời gian cho những việc quan trọng nhất. Tammi được thiết kế với giao diện tinh giản, dễ sử dụng cho mọi thành viên trong nhà: • Viễn thông thông minh: Quản lý, chia sẻ gói cước, nạp thẻ và data cho cá nhân và hộ gia đình • Dịch vụ: Tận hưởng các dịch vụ đa dạng: sức khỏe, du lịch, di chuyển, giáo dục,… được tích hợp sẵn. • Tiện ích gia đình: Thanh toán điện, nước, internet liền mạch, không lo trễ hạn. • Mua sắm & Giải trí: Khám phá thế giới ưu đãi Tammi xu và nội dung số được cá nhân hóa theo sở thích. • Nền tảng kết nối OTT: Tính năng call, chat, meeting ưu việt giúp kết nối thuận tiện với mọi người Được phát triển bởi Viettel, Tammi cam kết mang đến một môi trường số an toàn, ổn định và luôn lắng nghe để hoàn thiện mỗi ngày. Chúng tôi mong muốn được đồng hành cùng bạn vun đắp một cuộc sống hiện đại và thảnh thơi hơn. Hãy tải Tammi và bắt đầu hành trình trải nghiệm sự khác biệt ngay hôm nay!
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
React Navigation
Zustand
React Native Paper
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.
