# Authenticator Duo vs SmartLuke

The clearest difference is update cadence: Authenticator Duo at daily against SmartLuke's every 2 weeks. Authenticator Duo also leads on iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Authenticator Duo sells 3 in-app purchases, starting at $6.99 per 7 days and SmartLuke sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Authenticator Duo ships an update daily, SmartLuke every 2 weeks. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Authenticator Duo | SmartLuke |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (7 ratings)](https://appshunter.io/ios/app/authenticator-duo-two-factor/id6615062059/reviews)** | — |
| Number of ratings | **7** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 weeks |
| Monetization | Subscription | — |
| Size | 16 MB | 8 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shawna Margie](https://appshunter.io/developer/1775558385) | [IPCREA](https://appshunter.io/developer/374554053) |

## What reviewers say

### Authenticator Duo

[App page](https://appshunter.io/ios/app/authenticator-duo-two-factor/id6615062059)

This app provides robust two-factor authentication to secure your online accounts. It offers easy setup, management, and backup/sync features using advanced security protocols for peace of mind.

**Highlights:** Two-Factor Authentication (2FA), Easy Setup & Management, Backup & Sync, Advanced Security Protocols, User-Friendly Interface

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro + 3 Days Trial | $6.99 | per 7 days |
| Monthly Pro | $19.99 | per month |
| Annual Pro | $49.99 | per year |


### SmartLuke

[App page](https://appshunter.io/ios/app/smartluke/id6758266395)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Token 1000 | $8.99 | one-time |
| Token 5000 | $44.99 | one-time |
| Token 10000 | $79.99 | one-time |


## Frequently asked questions

### Is Authenticator Duo free?

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

### Is SmartLuke free?

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

### Do Authenticator Duo or SmartLuke have ads?

Neither Authenticator Duo nor SmartLuke shows ads.

### Which is updated more often, Authenticator Duo or SmartLuke?

Authenticator Duo ships an update daily, and SmartLuke every 2 weeks. Most recently, Authenticator Duo was updated on September 30, 2026 and SmartLuke on October 9, 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.*