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
VK: social network, messenger
VK unites tens of millions of people by offering unlimited features for communication, dating, entertainment, business and sharing news from anywhere around the world
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.7
27,460 ratings · Top 50%
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 VK: social network, messenger: map the core Social Networking 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
Optimize database queries and caching strategies.
Assumption to check: Inconsistent performance and slow load times
Validate with people who use this workflow before building.
Hypothesis 2
Implement stronger data encryption and user control over data.
Assumption to check: Privacy concerns over data handling
Validate with people who use this workflow before building.
Hypothesis 3
Enhance moderation tools and user reporting features.
Assumption to check: Limited content moderation leading to inappropriate posts
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation structure and improve onboarding.
Assumption to check: Complex navigation causing confusion
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
VK unites tens of millions of people by offering unlimited features for communication, dating, entertainment, business and sharing news from anywhere around the world. On the app, you can listen to music, watch videos and clips, keep track of your health, play games, and shop. Stay in touch with friends and family. In the messenger, you can chat in group chats and private messages with both friends on VK and people from your phone’s contacts. Bring together an unlimited number of people in video calls, all for free with no time limits. VK has social media solutions for a wide variety everyday situations: - Discover everything one of the largest social networks in the world has to offer. Meet new friends and join online communities. Stay close with faraway friends using the messenger and VK Calls. - Listen to the music you love and easily find your new favorite songs thanks to personalized recommendations. - Watch and create VK Clips, short vertical videos covering a wide range of themes. - Enjoy live streams, share pictures, play games, and read interesting news in thematic feeds. - Learn something new in podcasts and upload your own. - Keep track of your health and stay in shape. Use VK Health to compete with your friends and see who can walk the most. Your steps are counted thanks to Apple Health. So take a nice long walk, and try to get to the top of the leaderboard! Terms of Service: vk.com/terms Privacy Policy: vk.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
Zustand
@supabase/supabase-js
react-navigation
react-native-reanimated
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.
