# Attic Calendar vs ERG Community

The clearest difference is in-app purchases: ERG Community at none against Attic Calendar's 1. ERG Community also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Attic Calendar sells 1 one-off in-app purchase. ERG Community asks for nothing beyond the download.

Attic Calendar ships an update weekly, ERG Community every 2 weeks. The most recent releases landed on November 7, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Attic Calendar | ERG Community |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/attic-calendar/id6504639335/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 94 MB | 8 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Lee](https://appshunter.io/developer/1753164877) | [EONS Developments](https://appshunter.io/developer/6772750260) |

## What reviewers say

### Attic Calendar

[App page](https://appshunter.io/ios/app/attic-calendar/id6504639335)

Explore the ancient Athenian calendar with this app. Track solstices, equinoxes, moon phases, and ancient Greek festivals. Features include customizable widgets for at-a-glance viewing and detailed calculation rules for historical accuracy.

**Highlights:** Ancient Athenian calendar tracking, Solstice and equinox markers, Moon phase tracking, Ancient Greek festivals and events, Lock screen and home screen widgets, Customizable day start (sunset/midnight)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.00 | one-time |


### ERG Community

[App page](https://appshunter.io/ios/app/erg-community/id6792078514)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Attic Calendar free?

Attic Calendar is free to download, with in-app purchases available.

### Is ERG Community free?

ERG Community is free to download, with no in-app purchases.

### Do Attic Calendar or ERG Community have ads?

Neither Attic Calendar nor ERG Community shows ads.

### Which is updated more often, Attic Calendar or ERG Community?

Attic Calendar ships an update weekly, and ERG Community every 2 weeks. Most recently, Attic Calendar was updated on November 7, 2026 and ERG Community on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*