# CO2 Tracker vs International SIM

CO2 Tracker and International SIM both sit at 5.0 stars, but that hides the real split: 100% of CO2 Tracker's written reviews are positive against 63% of International SIM's. CO2 Tracker also leads on monetization model (free vs free with in-app purchases) and ratings volume (3 vs 1). International SIM's advantage is update cadence (every 10 days vs every 3 months). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for CO2 Tracker against 5.0 for International SIM. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews are what separate them: 100% of CO2 Tracker's written reviews are positive against 63% of International SIM's.

CO2 Tracker ships an update every 3 months, International SIM every 10 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | CO2 Tracker | International SIM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/co2-tracker/id1459765187/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/international-sim/id6739003852/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | **100.0% of reviews** | 62.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 91 MB |
| Requires iOS | **12.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Madhu Raghavan](https://appshunter.io/developer/1459765186) | [Bouygues Telecom](https://appshunter.io/developer/316348393) |

## What reviewers say

### CO2 Tracker

[App page](https://appshunter.io/ios/app/co2-tracker/id1459765187)

Calculate the carbon dioxide output of your flights by entering your departure and arrival cities. Understand the environmental impact of your travel and make more responsible decisions to help protect the planet.

**Highlights:** Calculate flight CO2 output, Enter departure and arrival cities, Select from 40 aircraft types, Determine flight distance, View percentage of annual safe CO2 output

**Features:** macOS Compatibility

**In-app purchases:** none


### International SIM

[App page](https://appshunter.io/ios/app/international-sim/id6739003852)

Stay connected globally with eSIM technology in over 200 countries. This app offers a simple, secure, and affordable way to get mobile data, calls, and SMS abroad without roaming charges. Purchase and set up your eSIM in minutes for instant connectivity upon arrival.

**Highlights:** eSIM technology for global connectivity, Coverage in over 200 countries and regions, Instant eSIM setup and activation, Affordable local, regional, and global plans, Data, calls, and SMS services, No roaming charges

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is CO2 Tracker free?

CO2 Tracker is free to download, with no in-app purchases.

### Is International SIM free?

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

### Which has better reviews, CO2 Tracker or International SIM?

CO2 Tracker and International SIM are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do CO2 Tracker or International SIM have ads?

Neither CO2 Tracker nor International SIM shows ads.

### Which is updated more often, CO2 Tracker or International SIM?

CO2 Tracker ships an update every 3 months, and International SIM every 10 days. Most recently, CO2 Tracker was updated on October 24, 2026 and International SIM 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.*