# DuoFace vs Acid

The clearest difference is rating: Acid at 3.0 against DuoFace's 2.3. On price, review sentiment, ratings volume and update cadence there is nothing between them.

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

Acid holds the better App Store score, 3.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

DuoFace ships an update every 9 days, Acid every 5 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | DuoFace | Acid |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/duoface-private-messenger/id6503286911/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/acid/id6767066946/reviews)** |
| Number of ratings | **3** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 5 days** |
| Monetization | Free | Free |
| Size | 41 MB | 52 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [JUSI PTE.LTD.](https://appshunter.io/developer/1659814629) | [Fernando Rui](https://appshunter.io/developer/1896366144) |

## What reviewers say

### DuoFace

[App page](https://appshunter.io/ios/app/duoface-private-messenger/id6503286911)

This secure messaging app prioritizes your privacy with end-to-end encryption and anonymous communication. It offers a clean, ad-free experience, allowing you to chat without revealing personal contact information.

**Highlights:** End-to-end message encryption, Anonymous communication via Duo Numbers, No ads or trackers, Private contact information, Secure data safeguarding

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

**In-app purchases:** none


### Acid

[App page](https://appshunter.io/ios/app/acid/id6767066946)

Connect with communities that matter to you, from niche fandoms to close friends. Create or join groups with dedicated posts, real-time chat, and private messaging. Enjoy a focused, ad-free social experience built for genuine conversations.

**Highlights:** Create or join communities, Posts, comments, and reactions, Real-time chat rooms, Private direct messages, Customizable user profiles, Notification system

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

**In-app purchases:** none


## Frequently asked questions

### Is DuoFace free?

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

### Is Acid free?

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

### Which has better reviews, DuoFace or Acid?

Acid is rated higher. DuoFace averages 2.3 out of 5 from 3 ratings, while Acid averages 3.0 from 2 ratings.

### Do DuoFace or Acid have ads?

Neither DuoFace nor Acid shows ads.

### Which is updated more often, DuoFace or Acid?

DuoFace ships an update every 9 days, and Acid every 5 days. Most recently, DuoFace was updated on October 30, 2026 and Acid on November 5, 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.*