# USim vs Butlr

The clearest difference is update cadence: USim at weekly against Butlr's every 3 weeks. USim also leads on iOS requirement (15.6 vs 17.0). 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.

USim ships an update weekly, Butlr every 3 weeks. The most recent releases landed on November 4, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | USim | Butlr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (779 ratings)](https://appshunter.io/ios/app/usim-esim-unlimited-data/id6502586159/reviews)** | — |
| Number of ratings | **779** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 101 MB | 40 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Amas International](https://appshunter.io/developer/1746008905) | [Butlr Systems](https://appshunter.io/developer/6809134780) |

## What reviewers say

### USim

[App page](https://appshunter.io/ios/app/usim-esim-unlimited-data/id6502586159)

Stay connected globally with unlimited data plans for over 200 destinations. Avoid high roaming fees and the hassle of physical SIM cards. Manage all your international data needs conveniently within one app.

**Highlights:** Unlimited data plans, Global coverage in 200+ destinations, Affordable pricing, Instant eSIM activation, No hidden fees, 24/7 multilingual support

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast and easy eSIM activation process
- 💰 Affordable pricing and good value for money
- 🌍 Excellent international coverage across multiple countries
- 💳 Cashback rewards program
- 👍 User-friendly and intuitive app interface

**What reviewers complain about**

- 😞 Extremely slow customer support response times
- 🔌 Weak network signal and poor connectivity in some regions
- 📵 Unreliable service - frequent disconnections and dropouts
- 🚫 Unresponsive customer service team
- 💸 Unauthorized charges and payment issues without receipts

**Reported bugs**

- eSIM fails to activate after payment
- Application loading issues preventing plan selection
- Network disconnections requiring device restart
- Internet connection freezing and hanging
- Charges applied without service delivery

**Requested features**

- Faster customer support response system
- Real-time network coverage maps
- Automatic refund system for failed activations
- Live chat support option
- Better technical support documentation


### Butlr

[App page](https://appshunter.io/ios/app/butlr/id6769944247)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is USim free?

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

### Is Butlr free?

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

### Do USim or Butlr have ads?

Neither USim nor Butlr shows ads.

### Which is updated more often, USim or Butlr?

USim ships an update weekly, and Butlr every 3 weeks. Most recently, USim was updated on November 4, 2026 and Butlr on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*