# Sigma Events vs ANAC

The clearest difference is ads: Sigma Events at none against ANAC's shown. ANAC's advantage is update cadence (every 10 days vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sigma Events ships an update every 3 months, ANAC every 10 days. The most recent releases landed on September 15, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Sigma Events | ANAC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (30 ratings)](https://appshunter.io/ios/app/anac/id6469100714/reviews)** |
| Number of ratings | — | **30** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | — | Free |
| Size | 68 MB | 139 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [SIGMA THETA TAU INTERNATIONAL HONOR SOCIETY OF NURSING, INC.](https://appshunter.io/developer/1353455823) | [Association of Nurses in AIDS](https://appshunter.io/developer/1377410749) |

## What reviewers say

### Sigma Events

[App page](https://appshunter.io/ios/app/sigma-events/id1666020397)

**Features:** macOS Compatibility

**In-app purchases:** none


### ANAC

[App page](https://appshunter.io/ios/app/anac/id6469100714)

This organization connects nurses and healthcare professionals dedicated to HIV/AIDS care. It facilitates research, information exchange, and advocacy for policy and public awareness. The goal is to improve care, prevention, and the overall health of those affected by HIV/AIDS.

**Highlights:** Connects healthcare professionals in HIV/AIDS care, Promotes research and information exchange, Advocates for effective public policies, Fosters social awareness on HIV/AIDS issues, Supports prevention of HIV infection, Global network of over 40 chapters

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Sigma Events free?

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

### Is ANAC free?

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

### Do Sigma Events or ANAC have ads?

ANAC shows ads; Sigma Events does not.

### Which is updated more often, Sigma Events or ANAC?

Sigma Events ships an update every 3 months, and ANAC every 10 days. Most recently, Sigma Events was updated on September 15, 2026 and ANAC on September 14, 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.*