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
VCalendar
Description
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
4 ratings · Top 30%
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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.
JavaScript is required to complete mailbox verification.
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 VCalendar: map the core Lifestyle workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Provide more flexibility in event settings and customization.
Assumption to check: Limited customization options for events
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly design for better clarity.
Assumption to check: Cluttered calendar view
Validate with people who use this workflow before building.
Hypothesis 3
Introduce notification features to remind users of upcoming events.
Assumption to check: Lack of reminders and notifications
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the filtering capabilities for events to improve user experience.
Assumption to check: Inadequate filtering options
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
Description "VCalendar" app is a very unique Indian Vedic calendar app that is designed and developed by VenkatRama & Co, Andhra Pradesh, India. Our app offers full-fledged Indian vedic calendar on app store. It supports worldwide Cities (various time zones) and is a very useful app that can be referred by anyone on a daily basis. If you are wondering what is so unique about our app, it provides accurate timezone-specific data based on various key aspects such as Tithi, Masa, Nakshatra, Festivals, Rahu Kaal, Gulika Kaal, Yamakantaka kaal, SunRise/SunSet, Don't you agree that this is a "Smart & Compact" way of carrying/viewing the traditional vedic calendar on your mobile and that too at your fingertips!!! What more fascinating, exciting and interesting it could get. Please read further to learn more about our app. Key features: 1) Daily Tidhi, Nakshatra, Festivals, Masam, Rahu Kalam etc. details for the current year 2) All details are timezone specific covering India and other worldwide timezones at a click of a button!! 3) Provides sunrise/sunset for Indian timezone. 4) View the festivals in separate tab. main festivals are marked in different color 5) Pay once and get free calendar update for every year on Tidhis,Nakshatram,Masam,Varjyam,Rahu kalam,Festivals etc.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
TypeScript
react-navigation
react-query
@react-native-community/datetimepicker
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.
