# Duo Authenticator vs NATP Tax Forums

The clearest difference is in-app purchases: NATP Tax Forums at none against Duo Authenticator's 3. NATP Tax Forums also leads on ads (none vs shown) and device support (3 vs 1). Duo Authenticator's advantage is update cadence (monthly vs every 3 months). On price and iOS requirement there is nothing between them.

Both are free to download. Duo Authenticator sells 3 in-app purchases, starting at $3.99 per 7 days. NATP Tax Forums asks for nothing beyond the download.

Duo Authenticator ships an update monthly, NATP Tax Forums every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Duo Authenticator | NATP Tax Forums |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (24 ratings)](https://appshunter.io/ios/app/duo-authenticator/id1665454984/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 61 MB | 98 MB |
| Requires iOS | 16.6 | **15.5** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Petr Polasek](https://appshunter.io/developer/1613323784) | [National Association of Tax Professionals, Inc.](https://appshunter.io/developer/1124106999) |

## What reviewers say

### Duo Authenticator

[App page](https://appshunter.io/ios/app/duo-authenticator/id1665454984)

Enhance your online security with this multi-factor authentication app. It provides an extra layer of protection for your accounts by generating time-sensitive codes, even when offline. Secure your sensitive information with ease and peace of mind.

**Highlights:** Quick and easy setup, Wide service compatibility, Time-sensitive security codes, Offline code generation, End-to-end encryption, Security code protection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 1 Week | $3.99 | per 7 days |
| Premium 1 Month | $9.99 | per month |
| Premium 1 Year | $29.99 | per year |


### NATP Tax Forums

[App page](https://appshunter.io/ios/app/natp-tax-forums/id6792034324)

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

**In-app purchases:** none


## Frequently asked questions

### Is Duo Authenticator free?

Duo Authenticator is free to download, with in-app purchases available.

### Is NATP Tax Forums free?

NATP Tax Forums is free to download, with no in-app purchases.

### Do Duo Authenticator or NATP Tax Forums have ads?

Duo Authenticator shows ads; NATP Tax Forums does not.

### Which is updated more often, Duo Authenticator or NATP Tax Forums?

Duo Authenticator ships an update monthly, and NATP Tax Forums every 3 months. Most recently, Duo Authenticator was updated on October 24, 2026 and NATP Tax Forums on October 24, 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.*