Comparison

51See vs ThirdEye

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

51See

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
Read full description

M51C平台是一个可以用应用于智能家居、行业监控的物联平台,它包括设备、云服务器系统、客户端完整解决方案。该客户端是我们为客户提供的一个通用版客户端。客户也可以基于我们的方案定制自己的系统。我们提供的服务包括:1) 设备硬件及SDK定制,包括:摄像机、RFID、智能网关;2) 云服务器系统定制开发;不同平台的定制开发及SDK,甚至包括源代码。

About

ThirdEye

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
Read full description

Three-Eye Monitor is a remote monitoring app specifically designed for home environments. With just two iPhones or iPads, you can instantly set up your own home security system—no extra hardware required, and no complicated configurations. Whether you're checking on a sleeping baby, watching your pets, or securing your home, Three-Eye Monitor allows you to view live feeds from anywhere, at any time. —— Why Choose Three-Eye Monitor? —— 【No Cloud Storage, More Secure】 Unlike traditional security apps, Three-Eye Monitor does not rely on cloud servers. Your video and data stay exclusively on your devices—no uploads, no sharing, total privacy. 【Direct Local Connection】 Supports peer-to-peer (P2P) local connections between devices, providing ultra-low latency and stable real-time streaming. 【Turn Old Phones into Security Cameras】 Give your idle iPhone or iPad a second life. Easily transform old devices into powerful home security cameras. 【Versatile Use Cases】 Baby Monitor: Keep an eye on your little one. Pet Cam: Check in on your pets while you're away. Home Security: Guard your living space 24/7. Elderly Care: Stay connected with aging family members. Small Business: Monitor your shop or office. On-the-go: Temporary remote monitoring whenever you need it. 【Simple and Intuitive】 Forget complex registrations. Start monitoring immediately without creating an account. Seamlessly sync across devices via iCloud. Just sign in with the same Apple ID, and your devices will automatically discover each other and establish a secure connection. Its clean, minimalist design makes remote viewing feel effortless and natural. —— A Privacy-First Experience —— We believe that home security should never come at the cost of your personal privacy. Three-Eye Monitor is dedicated to providing a simpler, safer, and more localized remote monitoring experience. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

51See3 screens
ThirdEye4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

51See ships an update every 3 weeks, ThirdEye every 2 weeks. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 6 level
51See versus ThirdEye: the parameters behind the verdict, then further details
Parameter51SeeThirdEye
PriceFree — better$2.99
Rating—5.0 (1 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings—1 — better
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS8.0 — better15
Further details — not scored
Size33 MB37 MB
Age rating4+4+
Developer大帅 李超 雷

Customer experience

51See

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ThirdEye

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

51See

No in-app purchases

3 purchases

ThirdEye

Subscriptions2
  • ThirdEye Pro Monthly$1.991 Month
  • ThirdEye Pro Yearly$14.991 Year
One-time1
  • ThirdEye Pro Lifetime Purchase$34.99

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 every 2 weeks. Most recently, 51See was updated on October 24, 2026 and ThirdEye on October 8, 2026.

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