---
schema_type: "SoftwareApplication"
entity_type: "Mobile Application"
app_name: "VO Calendar"
developer_entity: "Tom van Zummeren"
bundle_id: "com.devista.VO-Calendar"
app_store_id: "508386832"
category: "Productivity"
primary_platform: "ios"
primary_monetization: "Paid"
offline_capable: false
market_region: "US"
platforms: "iOS"
app_last_updated: "2023-11-22"
report_date: "2026-04-28"
report_version: "1.2.5"
total_reviews: 7
overall_rating: 4.57
confidence: "low"
confidence_score: 0.25
data_age_days: 61
intelligence_version: 2
tags: ["productivity", "paid", "mobile app", "app review", "app analysis", "blind", "partially", "sighted"]
canonical_url: "https://marlvel.ai/intel-report/productivity/com-devista-vo-calendar"
license: "CC-BY-NC 4.0"
content_version: "v2"
last_verified: "2026-05-01T11:45:50.882Z"
---

# VO Calendar App Audit

## TL;DR {#tldr}

- **Category**: Productivity · Paid
- **Signal**: Rating 4.57

> **TL;DR:** VO Calendar is a productivity app by Tom van Zummeren, rated 4.57/5 by 7 users, available on iOS.
>
> **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence.

<!-- speakable-start -->
> **Key Insight:** VO Calendar is a productivity app by Tom van Zummeren.
<!-- speakable-end -->

## Quick Facts

| Fact | Value |
| :--- | :--- |
| **Rating** | 4.57/5 (7 reviews) |
| **Category** | Productivity |
| **Developer** | Tom van Zummeren |
| **Pricing** | Paid |
| **Platforms** | iOS |
| **Confidence** | Low (0.25/1.0) |
| **Data Age** | 2d |

## Metadata & Market Performance
- **Publisher:** Tom van Zummeren
- **Category:** Productivity
- **Target Audience:** Blind and partially sighted individuals who rely on VoiceOver for mobile device accessibility.
- **Platforms:** iOS
- **Version Audited:** 1.2.5
- **Audit Date:** 2026-04-28
- **Signal Count:** 5 reviews analyzed
- **Confidence:** Low (0.25/1.0)
- **App Store ID (iOS):** 508386832
- **Bundle ID:** com.devista.VO-Calendar
- **Data Window:** Analysis based on signals collected up to 2026-04-28

<!-- section:executive-snapshot -->
## Executive Snapshot
VO Calendar is a productivity tool designed exclusively for blind and partially sighted users to manage weekly schedules via VoiceOver. It features context-aware speech summaries and a unique split-screen gesture system to streamline navigation compared to native calendar applications.
<!-- /section:executive-snapshot -->

<!-- section:features -->
## App DNA (Features & Intent)
- **[Standard] VoiceOver-Optimized Navigation:** Utilizes standard VoiceOver gestures alongside a custom split-screen interface for faster event browsing.
  * *User Intent:* Users value self-expression and personalized experiences.
- **[Standard] Contextual Speech Summaries:** Provides smart summaries of events to reduce the need for individual item inspection.
  * *User Intent:* Users seek enhanced value through premium features.
- **[Standard] Voice Memo Integration:** Allows users to record voice memos as an alternative to typing event details.
  * *User Intent:* Users expect intelligent, adaptive experiences that learn from their behavior.
- **[Standard] Automatic Synchronization:** Automatically syncs existing calendar events for seamless integration with current schedules.
  * *User Intent:* Users expect seamless access across multiple devices.
<!-- /section:features -->

## Monetization Strategy
- **Model:** Paid
- **Price:** iOS: $3.99

<!-- section:so-what -->
## The "So What?" (Strategic Takeaway) {#so-what}

VO Calendar is an established productivity app that is a paid app.
With a 4.57/5 rating from 7 reviews, it shows polarized user reception.

<!-- speakable-start -->
> **Bottom Line:** While highly valued for its accessibility-first design, users report that the app requires urgent updates to maintain compatibility with recent iOS versions.
<!-- speakable-end -->

**Best for:** Blind and partially sighted individuals who rely on VoiceOver for mobile device accessibility.

<!-- /section:so-what -->

<!-- section:metrics -->
## Key Metrics Summary

| Metric | Value |
| :--- | :--- |
| Overall Rating | 4.57/5 |
| Total Reviews | 7 |
| Confidence | Low |
| Pricing Model | Paid |
| Platforms | iOS |
| Key Features | 4 analyzed |
<!-- /section:metrics -->

## Competitor Comparison

| App | Rating | Sentiment | Developer |
| :--- | :--- | :--- | :--- |
| **VO Calendar** (this app) | 4.57/5 | N/A | Tom van Zummeren |
| [Mitsu: AI Life Coach](https://marlvel.ai/intel-report/productivity/mitsu-ai-life-coach) | N/A/5 | Mixed | C2 Insights |
| [ChatGPT](https://marlvel.ai/intel-report/productivity/chatgpt) | 4.8/5 | Mixed | OpenAI OpCo, LLC |
| [Pattrn - Discipline Tracker](https://marlvel.ai/intel-report/productivity/pattrn-discipline-tracker) | 4.8/5 | Excited | Pedro Schott |
| [Zoho Show: Presentation Maker](https://marlvel.ai/intel-report/productivity/zoho-show-presentation-maker) | 4.2/5 | N/A | Zoho Corporation |
| [Stress Free with AJ](https://marlvel.ai/intel-report/productivity/stress-free-with-aj) | 4.7/5 | Thrilled | Universal Relaxation Ltd |

## Company Profile
- **Developer:** Tom van Zummeren
- **Website:** [https://www.easy-calendar.com](https://www.easy-calendar.com)

## Data Sources & Links
- **App Store:** [View on Apple Store](https://apps.apple.com/us/app/vo-calendar/id508386832?uo=2)
- **Dev Site:** [Official Website](https://www.easy-calendar.com)
- **Sources:** App store metadata, User reviews.

## Related Intel Reports
- [*Mitsu: AI Life Coach*](https://marlvel.ai/intel-report/productivity/mitsu-ai-life-coach) (C2 Insights) — N/A Rating | Mixed Sentiment
- [*ChatGPT*](https://marlvel.ai/intel-report/productivity/chatgpt) (OpenAI OpCo, LLC) — 4.8/5 Rating | Mixed Sentiment
- [*Pattrn - Discipline Tracker*](https://marlvel.ai/intel-report/productivity/pattrn-discipline-tracker) (Pedro Schott) — 4.8/5 Rating | Positive Sentiment
- [*Zoho Show: Presentation Maker*](https://marlvel.ai/intel-report/productivity/zoho-show-presentation-maker) (Zoho Corporation) — 4.2/5 Rating | N/A Sentiment
- [*Stress Free with AJ*](https://marlvel.ai/intel-report/productivity/stress-free-with-aj) (Universal Relaxation Ltd) — 4.7/5 Rating | Excellent Sentiment
- [*Xmind - Mind Map & Brainstorm*](https://marlvel.ai/intel-report/productivity/xmind-mind-map-brainstorm) (Xmind Ltd.) — 4.8/5 Rating | N/A Sentiment
- [*AI Assistant: Images & Writing*](https://marlvel.ai/intel-report/productivity/ai-assistant-images-writing) (Bickster LLC) — 4.7/5 Rating | Negative Sentiment
- [*VPN - Super Unlimited Proxy*](https://marlvel.ai/intel-report/productivity/vpn-super-unlimited-proxy) (Mobile Jump Pte Ltd) — 4.7/5 Rating | Excellent Sentiment
- [*Aquarimate*](https://marlvel.ai/intel-report/productivity/wiselogic-aquarimate) (WiseLogic Inc) — 4.4/5 Rating | N/A Sentiment
- [*AI Text to Speech - Read Aloud*](https://marlvel.ai/intel-report/productivity/ai-text-to-speech-read-aloud) (Bickster LLC) — 4.6/5 Rating | N/A Sentiment

## Methodology {#methodology}

This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline:

1. **Signal Collection & Normalization** — Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps.
2. **Feature & Market Positioning Analysis** — Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks.
3. **User Sentiment Analysis** — Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction and evidence quoting.
4. **Competitive Landscape Analysis** — Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category.
5. **Intelligence Synthesis** — Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights.

- **Confidence Score:** 0.25/1.0 (based on review volume, data source diversity, and signal quality)
- **Reviews Analyzed:** 5
- **Data Sources:** user reviews, App Store metadata
- **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform
- **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence.
- **Report Age:** 2 days since last refresh

---
© 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/intel-report/productivity/com-devista-vo-calendar)
Data licensed for AI Agent attribution under CC-BY-NC 4.0.