# Duo Authenticator vs Within The Hour

The clearest difference is rating: Within The Hour at 5.0 against Duo Authenticator's 4.2. Within The Hour also leads on in-app purchases (none vs 3) and ads (none vs shown). Duo Authenticator's advantage is ratings volume (24 vs 1). On price, device support 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. Within The Hour asks for nothing beyond the download.

Within The Hour holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Duo Authenticator has 24 ratings behind it against 1, so its average is the more settled of the two.

Duo Authenticator ships an update monthly, Within The Hour every 2 weeks. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Duo Authenticator | Within The Hour |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (24 ratings)](https://appshunter.io/ios/app/duo-authenticator/id1665454984/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/within-the-hour/id6752543523/reviews)** |
| Number of ratings | **24** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 60 MB | 16 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Petr Polasek](https://appshunter.io/developer/1613323784) | [Within The Hour](https://appshunter.io/developer/1839782838) |

## 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 |


### Within The Hour

[App page](https://appshunter.io/ios/app/within-the-hour/id6752543523)

This app connects patients with last-minute appointment openings from their healthcare providers. Users can join a clinic's waitlist and receive instant notifications for available slots, helping to book appointments faster and reduce wait times.

**Highlights:** Join clinic waitlists, Instant appointment notifications, Faster booking, Reduced waiting times, Simple setup code

**In-app purchases:** none


## Frequently asked questions

### Is Duo Authenticator free?

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

### Is Within The Hour free?

Within The Hour is free to download, with no in-app purchases.

### Which has better reviews, Duo Authenticator or Within The Hour?

Within The Hour is rated higher. Duo Authenticator averages 4.2 out of 5 from 24 ratings, while Within The Hour averages 5.0 from 1 ratings.

### Do Duo Authenticator or Within The Hour have ads?

Duo Authenticator shows ads; Within The Hour does not.

### Which is updated more often, Duo Authenticator or Within The Hour?

Duo Authenticator ships an update monthly, and Within The Hour every 2 weeks. Most recently, Duo Authenticator was updated on October 9, 2026 and Within The Hour on October 13, 2026.

---

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