# Sensi vs DUO LINK 4

The clearest difference is rating: Sensi at 4.6 against DUO LINK 4's 2.1. Sensi also leads on ratings volume (246K vs 513) and review sentiment (36% vs 20%). DUO LINK 4's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (11.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sensi holds the better App Store score, 4.6 against 2.1. That said, the two scores are not equally well evidenced: Sensi has 246K ratings behind it against 513, so its average is the more settled of the two. Written reviews point the same way: 36% of Sensi's written reviews are positive against 20% of DUO LINK 4's.

Sensi ships an update monthly, DUO LINK 4 every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sensi | DUO LINK 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (246K ratings)](https://appshunter.io/ios/app/sensi/id792612452/reviews)** | [2.1 (513 ratings)](https://appshunter.io/ios/app/duo-link-4/id1103672387/reviews) |
| Number of ratings | **246K** | 513 |
| Positive reviews | **35.5% of reviews** | 19.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 63 MB | 123 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Copeland LP](https://appshunter.io/developer/464252882) | [PNY](https://appshunter.io/developer/1103672386) |

## What reviewers say

### Sensi

[App page](https://appshunter.io/ios/app/sensi/id792612452)

Control your home's climate remotely with a smart thermostat. Adjust temperature, set schedules, and receive alerts from anywhere. Integrates with popular smart home platforms for seamless control.

**Highlights:** Remote temperature control, 7-day scheduling, Usage reports, Service reminders, Geofencing, Smart home integration

**In-app purchases:** none

**What reviewers like**

- 🚀 Fantastic remote control
- 🔥 Great functionality
- 👍 Easy installation
- 💰 Good value
- ⏱️ Helpful usage tracking

**What reviewers complain about**

- 🔌 Frequent disconnections
- 🐛 Inconsistent performance
- 📱 Unintuitive app interface
- 🌐 Lacks international support
- 🌡️ Inaccurate humidity readings

**Reported bugs**

- Thermostat randomly disconnects from WiFi
- Programmed schedules not being retained
- Temperature settings not sticking after adjustments

**Requested features**

- Finer temperature control in Celsius
- Automatic heating/cooling mode switching based on outdoor temperature
- More detailed usage reporting
- Ability to set schedules with shorter intervals
- Support for multiple user accounts and geofencing


### DUO LINK 4

[App page](https://appshunter.io/ios/app/duo-link-4/id1103672387)

Manage and transfer files between your iOS device and a USB flash drive. Free up storage, back up data, and even charge your device. Supports a wide range of file formats for seamless integration.

**Highlights:** Free up iPhone/iPad space, Charge iOS devices, Back up contacts, Transfer photos and videos, Store photos directly, Manage files, Music and video playback

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Efficient file transfer
- 💡 Useful for freeing up phone storage
- 👍 Straightforward to use

**What reviewers complain about**

- 🐛 Frequent app crashes
- 🔍 Confusing or limited UI
- 🔌 Compatibility issues with newer devices
- 💾 Data loss or corruption

**Reported bugs**

- App fails to detect connected device
- Transferred files not visible or accessible
- Inconsistent behavior when renaming folders

**Requested features**

- Add 'select all' option for photos/files
- Support for more file formats
- Improve iPad app experience
- Integrate with native Files app


## Frequently asked questions

### Is Sensi free?

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

### Is DUO LINK 4 free?

DUO LINK 4 is free to download, with no in-app purchases.

### Which has better reviews, Sensi or DUO LINK 4?

Sensi is rated higher. Sensi averages 4.6 out of 5 from 246K ratings, while DUO LINK 4 averages 2.1 from 513 ratings.

### Do Sensi or DUO LINK 4 have ads?

Neither Sensi nor DUO LINK 4 shows ads.

### Which is updated more often, Sensi or DUO LINK 4?

Sensi ships an update monthly, and DUO LINK 4 every 2 months. Most recently, Sensi was updated on October 27, 2026 and DUO LINK 4 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.*