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
xCalendar - Calendar in Excel
If you want to export your calendar events to an Excel file and edit them on your computer or - if you want to share these events with your friends so that they could import them to their own calendar, then xCalendar ...
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
4 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 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 xCalendar - Calendar in Excel: map the core Productivity 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
Implement advanced features like reminders, recurring events, and shared calendars.
Assumption to check: Limited features compared to other calendar apps
Validate with people who use this workflow before building.
Hypothesis 2
Create a more guided onboarding experience.
Assumption to check: User interface can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 3
Optimize data handling and rendering for better performance.
Assumption to check: Performance issues with large event data
Validate with people who use this workflow before building.
Hypothesis 4
Prioritize bug fixes and user feedback to improve stability.
Assumption to check: Low user ratings due to bugs
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
If you want to export your calendar events to an Excel file and edit them on your computer or - if you want to share these events with your friends so that they could import them to their own calendar, then xCalendar maybe right for you. xCalendar exports all of your events from your iPhone or iPad to an Excel file by email, USB, WiFi and Dropbox. You can then modify and maintain your schedule easily and conveniently on your computer using Excel, Numbers, OpenOffice or any other Excel-compatible application. Importing your schedule is also an easy thing to do. You can import an Excel file to your iPhone or iPad by email, USB, WiFi and Dropbox. xCalendar can update the existing events and add new events during import. Features include: 1. Export all events from all iPhone supported calendars(Local, Exchange, CalDAV, Subscription, Birthday). 2. Export all unique events by merging all recurring events. 3. Export all fields in the Event view of your iPhone’s built-in Calendar application, including title, location, dates, times, alarms, recurrence, etc. 4. Support for Excel 97-2003 file format (.xls), it is the most widely supported Excel file format. You can use MS Office 2003/2007/2010, OpenOffice.org, MAC Office, MAC Numbers to open and edit. 5. Keep a back-up copy of your Calendar events in Dropbox. 6. Export a calendar via email, it’s an easy way to share your personal calendar with your friends. 7. Export events to an excel file which can be imported into Outlook. 8. Import events from an Outlook Excel file (only available in the full version). 9. Import events from an Excel file to iCloud or Exchange Calendar. 10. Import unlimited number of events in seconds. 11. Preview the events which have been imported before saving them. 12. Add a new event if it does not already exist during import. 13. Update the existing events based on the title of the event and the calendar name during the import. 14. Create a new local calendar if it does not exist. 15. Support pages are provided to help you create your schedule on the spreadsheet.
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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
React Navigation
Async Storage
Axios
date-fns
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.
