# ACM CACM HD vs Alpha Events

The clearest difference is in-app purchases: Alpha Events at none against ACM CACM HD's 1. Alpha Events also leads on device support (3 vs 1). ACM CACM HD's advantage is iOS requirement (6.0 vs 15.6). On price, update cadence and ads there is nothing between them.

Both are free to download. ACM CACM HD sells 1 in-app purchase, starting at $124.99 per year. Alpha Events asks for nothing beyond the download.

ACM CACM HD ships an update every 3 months, Alpha Events every 2 months. The most recent releases landed on October 20, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | ACM CACM HD | Alpha Events |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/acm-cacm-hd/id434008197/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 4.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Subscription | — |
| Size | 27 MB | 233 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Association for Computing Machinery](https://appshunter.io/developer/405041865) | [ALPHA EVENTS LTD](https://appshunter.io/developer/1714283331) |

## What reviewers say

### ACM CACM HD

[App page](https://appshunter.io/ios/app/acm-cacm-hd/id434008197)

Access content from the Communications of the ACM magazine and website, including current and archived issues. Read, save, and share articles on your device.

**Highlights:** Read current and archived Communications of the ACM issues, Access content from the CACM website, Save articles for later, Share articles with others, Utilizes multitouch interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CACM 1-Year | $124.99 | per year |


### Alpha Events

[App page](https://appshunter.io/ios/app/alpha-events/id6740820926)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ACM CACM HD free?

ACM CACM HD is free to download, with in-app purchases available.

### Is Alpha Events free?

Alpha Events is free to download, with no in-app purchases.

### Do ACM CACM HD or Alpha Events have ads?

Neither ACM CACM HD nor Alpha Events shows ads.

### Which is updated more often, ACM CACM HD or Alpha Events?

ACM CACM HD ships an update every 3 months, and Alpha Events every 2 months. Most recently, ACM CACM HD was updated on October 20, 2026 and Alpha Events on September 10, 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.*