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
WhatsApp Business
About this app
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
1,538,839 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 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 WhatsApp Business: 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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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
About this app Everything you love about WhatsApp plus built-in tools for business WhatsApp Business is a free-to-download app with built-in tools to help you work smarter, build trust, and grow your business. You get free calls* and free international messaging* plus business features to help you do more with conversations. Download the app to get business benefits like these: • Work smarter. Save time by letting the app do the work for you! Send customers automated quick replies and away messages so you never miss an opportunity. Use labels to quickly organize, filter, and find important conversations. Create a status to share an offer or news, and even take orders and payments** in-app to create a great customer experience. • Build relationships and trust. With a professional business profile on a secure platform, you build credibility and trust with customers. Use the app to provide more responsive customer support and build long-term loyalty. Subscribe to Meta Verified*** to reinforce your authenticity. • Sell more and grow. Get discovered, advertise, and make more valuable customer connections. Boost sales by sending targeted offers to customers; create ads that click to WhatsApp; showcase your product catalog; and give customers the convenience of in-app orders and payments.** FAQs Are all features free? The app is free to download and use, with a mix of free and paid features. Can I still use my personal WhatsApp? Yes! As long as you have two different phone numbers, your business and personal accounts can live together on a single device. Can I transfer over my chat history? Yes. When you set up the WhatsApp Business app, you can restore a backup from your WhatsApp account to transfer your messages, media, and contacts to your business account. How many devices can I connect? You can have a total of five web-based devices or mobile phones on your account (up to 10 if you subscribe to Meta Verified***). *Data charges may apply. Contact your provider for details. **Not available in all markets ***Available soon globally Terms of Service: https://www.whatsapp.com/legal/terms-of-service Learn more about messaging privately: https://www.whatsapp.com/privacy Learn more about WhatsApp safety: https://www.whatsapp.com/security
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
Allow more branding options like custom themes and logos.
Assumption to check: Limited customization options for business profiles
Validate with people who use this workflow before building.
Hypothesis 2
Implement features for grouping chats or tagging conversations.
Assumption to check: Difficulty in managing multiple chat threads
Validate with people who use this workflow before building.
Hypothesis 3
Provide detailed insights on message delivery and response rates.
Assumption to check: Limited analytics for message performance
Validate with people who use this workflow before building.
Hypothesis 4
Enhance notification settings to allow better user control over alerts.
Assumption to check: Inconsistent notifications for messages
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
React Query
AsyncStorage
React Navigation
Firebase
BUILD KIT DIFFICULTY
Expert
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.
