# Calendarium - About this Day

> This day Now and in History

Canonical page: [https://chrome-stats.com/d/id482136387](https://chrome-stats.com/d/id482136387)

## Overview

- **ID:** `id482136387`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Piotr Knapczyk
- **Category:** Reference
- **Rating:** 4.70 / 5 (2,255 ratings)
- **Version:** 1.8.4
- **Last updated:** 2020-04-04
- **First published:** 2011-11-29
- **Size:** 54 MB
- **Data as of:** 2026-09-04
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/calendarium-about-this-day/id482136387)
- **Website:** [http://piotrknapczyk.com/](http://piotrknapczyk.com/)
- **Privacy policy:** [https://piotrknapczyk.com/privacypolicy/](https://piotrknapczyk.com/privacypolicy/)

## Description

Calendarium is a new, easy-to-use calendar that helps you discover many interesting things about this day. It blends on-this-day history with sunrise/sunset times, day length, week numbers, moon phase, planetary views, and geographic coordinates for a richer context. No internet is required, and all data can be explored offline.

Share your discoveries with friends via mail, Twitter, Facebook, or text. Calendarium uses your location only to provide accurate sunrise/sunset times and day length; your data isn't stored, and disabling location only disables those features.

## Rankings

- #38,020 — Overall

## Review summary

The app is praised as a daily, educational look at history with Wikipedia links and easy deep-reading, helping learning and conversation. However, reviews repeatedly cite outdated content, a negative/war-centric focus with occasional inaccuracies, navigation/usability gaps, and lost sharing features, suggesting limited maintenance despite its engaging concept.

### Pros

- Daily historical topics with quick links to Wikipedia for each item, enabling deeper reading.
- Educational tool that encourages further research via Wikipedia links and quick lookups.
- Good for starting the day and maintaining a daily learning routine with engaging content.
- Broad coverage of events for the day, offering a comprehensive snapshot of history.
- Built-in ability to quickly Google an event to learn more details.

### Cons

- Data appears outdated with no notable updates since 2017 (and some reviews note 2015 as the last update).
- Content tends to focus on negative/war-related events, making the history feel depressing or unbalanced.
- Occasional factual errors and inaccuracies cited by users.
- Usability/navigation issues, such as difficulty navigating between dates and the desire for direct date selection.
- Removal of social sharing options reduces ease of sharing discoveries.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id482136387)