App Overview

VO Calendar icon

VO Calendar

Tom van Zummeren · Productivity

NOTE: Can only be used together with VoiceOver (for blind and partially sighted people).

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
8 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 included16 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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for VO Calendar: 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

Allow users to customize categories and colors for better organization.

Assumption to check: Limited customization for event categories

Validate with people who use this workflow before building.

Hypothesis 2

Introduce customizable reminders and alerts for events.

Assumption to check: Inadequate notifications for upcoming events

Validate with people who use this workflow before building.

Hypothesis 3

Enable sharing and collaboration on events with other users.

Assumption to check: Lack of collaboration features

Validate with people who use this workflow before building.

Hypothesis 4

Add support for syncing with Google Calendar and Apple Calendar.

Assumption to check: No integration with other calendars

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

NOTE: Can only be used together with VoiceOver (for blind and partially sighted people). VO Calendar is a weekly calendar specifically designed to be used with VoiceOver. The result of this VoiceOver-only design is not only a smoother navigation through the app. It also makes it possible for the VoiceOver speech to give smart summaries depending on the context. This prevents you from having to go through each event Individually. Existing events are automatically synchronized. If you prefer not to type, you can record voice memos instead. You can use VO Calendar with the VoiceOver gestures you are used to. However, there is an even faster way. With the screen being split into two halves you can scan the right half of the screen with your right thumb. A single tap with your left thumb then is enough to activate the concerning function. After getting used to you will find out this helps you to browse through your calendar even quicker. The left bottom always contains the ‘Return’ button so you can still reach it with your right thumb (being an L-shaped layout). At the top left you can always find a summary of the current screen content. In case you are left-handed you can swap left and right. Note: If you have multiple calendars configured, VO Calendar will show all concerning events. New events will be assigned to your iPhone’s default calendar. Change the default calendar in: Settings > Mail, Contacts, Calendars > Default Calendar. VO Calendar is developed in cooperation with Royal Dutch Visio, Centre of Expertise for blind and partially sighted people (www.visio.org). We appreciate your opinion and are always interested in hearing from you. Feel free to leave your feedback in the form of a review or contact us at: [email protected] In case you have problems recording a memo: - Hold one finger on 'Record memo' button - Use other finger to tap on screen (instead of first focussing on the button and then double tap)

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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.

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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.