# CheckCentral vs Periscope by Duet

The clearest difference is rating: Periscope by Duet at 5.0 against CheckCentral's 1.0. Periscope by Duet also leads on update cadence (fortnightly vs every 4 months) and ratings volume (4 vs 1). CheckCentral's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Periscope by Duet sells 2 in-app purchases, starting at $5.99 per month. CheckCentral asks for nothing beyond the download.

Periscope by Duet holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

CheckCentral ships an update every 4 months, Periscope by Duet fortnightly. The most recent releases landed on November 1, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | CheckCentral | Periscope by Duet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/checkcentral/id899651292/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/periscope-by-duet/id1517672689/reviews)** |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 43 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple TV |
| Age rating | 4+ | 4+ |
| Developer | [Binary Fortress Software](https://appshunter.io/developer/684986819) | [Duet, Inc.](https://appshunter.io/developer/935754063) |

## What reviewers say

### CheckCentral

[App page](https://appshunter.io/ios/app/checkcentral/id899651292)

This app monitors your email notifications and alerts you instantly via SMS, email, or push notifications when an issue requires your attention. It serves as a mobile companion to the CheckCentral service, requiring an account to use.

**Highlights:** Email notification monitoring, Instant alerts (SMS, email, push), Companion mobile app, Requires CheckCentral account

**Features:** macOS Compatibility

**In-app purchases:** none


### Periscope by Duet

[App page](https://appshunter.io/ios/app/periscope-by-duet/id1517672689)

This app provides a secure VPN connection to your home network from anywhere. It uses end-to-end encryption and smart connectivity to ensure reliable access to your home services and devices, even on restrictive networks. Setup is simple, allowing you to stay connected to your trusted network while traveling.

**Highlights:** Connect to home network globally, WireGuard protocol, End-to-end encryption, Smart connectivity for restrictive networks, Real-time connection stats, Simple setup

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Periscope Monthly | $5.99 | per month |
| Periscope | $24.99 | per year |


## Frequently asked questions

### Is CheckCentral free?

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

### Is Periscope by Duet free?

Periscope by Duet is free to download, with in-app purchases available.

### Which has better reviews, CheckCentral or Periscope by Duet?

Periscope by Duet is rated higher. CheckCentral averages 1.0 out of 5 from 1 ratings, while Periscope by Duet averages 5.0 from 4 ratings.

### Do CheckCentral or Periscope by Duet have ads?

Neither CheckCentral nor Periscope by Duet shows ads.

### Which is updated more often, CheckCentral or Periscope by Duet?

CheckCentral ships an update every 4 months, and Periscope by Duet fortnightly. Most recently, CheckCentral was updated on November 1, 2026 and Periscope by Duet on November 13, 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.*