# 51See vs ThirdEye

The clearest difference is price: 51See at Free against ThirdEye's $2.99. 51See also leads on in-app purchases (none vs 3) and iOS requirement (8.0 vs 15). On update cadence, ads and device support there is nothing between them.

51See is free to download; ThirdEye costs $2.99 up front. ThirdEye sells 3 in-app purchases, starting at $1.99 per month. 51See asks for nothing beyond the download.

51See ships an update every 3 weeks, ThirdEye fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | 51See | ThirdEye |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thirdeye-secure-home-camera/id6765831627/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | **Free** | Freemium |
| Size | 33 MB | 20 MB |
| Requires iOS | **8.0** | 15 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [大帅 李](https://appshunter.io/developer/873894806) | [超 雷](https://appshunter.io/developer/508810619) |

## What reviewers say

### 51See

[App page](https://appshunter.io/ios/app/51see/id873894803)

This app provides a comprehensive IoT platform for smart home and industry monitoring. It includes device hardware, cloud server systems, and client solutions, with options for customized development and source code.

**Highlights:** Smart home and industry monitoring, Device hardware and SDK customization, Cloud server system development, Client solutions, Customizable system development

**Features:** macOS Compatibility

**In-app purchases:** none


### ThirdEye

[App page](https://appshunter.io/ios/app/thirdeye-secure-home-camera/id6765831627)

Transform old iPhones or iPads into a secure home monitoring system without cloud storage. View live feeds locally and privately from anywhere, anytime. Ideal for baby monitoring, pet cams, and home security.

**Highlights:** No cloud storage, local privacy, Direct local peer-to-peer connection, Turn old phones into security cameras, Baby monitor, pet cam, home security, Simple setup, no account needed, iCloud sync across devices

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThirdEye Pro Monthly | $1.99 | per month |
| ThirdEye Pro Yearly | $14.99 | per year |
| ThirdEye Pro Lifetime Purchase | $34.99 | one-time |


## Frequently asked questions

### Is 51See free?

51See is free to download, with no in-app purchases.

### Is ThirdEye free?

ThirdEye costs $2.99, and also offers in-app purchases.

### Do 51See or ThirdEye have ads?

Neither 51See nor ThirdEye shows ads.

### Which is updated more often, 51See or ThirdEye?

51See ships an update every 3 weeks, and ThirdEye fortnightly. Most recently, 51See was updated on October 24, 2026 and ThirdEye 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.*