# Btutu thermometer vs Calleek

The clearest difference is iOS requirement: Btutu thermometer at 9.0 against Calleek's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 18, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Btutu thermometer | Calleek |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/calleek/id6740711706/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | — | Free |
| Size | 24 MB | 65 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [伟才 邓](https://appshunter.io/developer/893608406) | [Aibillity LLC](https://appshunter.io/developer/1791195382) |

## What reviewers say

### Btutu thermometer

[App page](https://appshunter.io/ios/app/btutu-thermometer/id1507724198)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calleek

[App page](https://appshunter.io/ios/app/calleek/id6740711706)

Connect globally with loved ones and colleagues using advanced international calling. Enjoy low rates, crystal-clear HD voice quality, and top-notch security for calls to over 200 countries. The intuitive design makes staying connected effortless.

**Highlights:** Unbeatable calling rates, Crystal-clear HD voice quality, Top-notch security and privacy, Global reach to over 200 countries, User-friendly interface, No hidden fees

**Features:** Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Btutu thermometer free?

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

### Is Calleek free?

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

### Do Btutu thermometer or Calleek have ads?

Neither Btutu thermometer nor Calleek shows ads.

### Which is updated more often, Btutu thermometer or Calleek?

Btutu thermometer ships an update weekly, and Calleek weekly. Most recently, Btutu thermometer was updated on October 18, 2026 and Calleek on October 12, 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.*