# CO2 Tracker vs Currencies

The clearest difference is in-app purchases: CO2 Tracker at none against Currencies's 2. CO2 Tracker also leads on ads (none vs shown) and review sentiment (100% vs 75%). Currencies's advantage is update cadence (every 2 weeks vs every 3 months) and ratings volume (56 vs 3). On price there is nothing between them.

Both are free to download. Currencies sells 2 in-app purchases, starting at $1.99 per month. CO2 Tracker asks for nothing beyond the download.

CO2 Tracker holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Currencies has 56 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of CO2 Tracker's written reviews are positive against 75% of Currencies's.

CO2 Tracker ships an update every 3 months, Currencies every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | CO2 Tracker | Currencies |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/co2-tracker/id1459765187/reviews)** | [4.7 (56 ratings)](https://appshunter.io/ios/app/currencies-quick-converter/id1476580948/reviews) |
| Number of ratings | 3 | **56** |
| Positive reviews | **100.0% of reviews** | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 11 MB | 18 MB |
| Requires iOS | **12.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Madhu Raghavan](https://appshunter.io/developer/1459765186) | [ALEKSANDR BRYNTSEV](https://appshunter.io/developer/1476580947) |

## 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


### Currencies

[App page](https://appshunter.io/ios/app/currencies-quick-converter/id1476580948)

This app provides fast and accurate currency conversion, ideal for travel and international payments. It offers offline access to the latest exchange rates and allows users to track currency trends with historical charts. No registration or internet connection is required for basic conversion.

**Highlights:** Instant currency conversion, Offline rate access, Automatic rate updates, Historical exchange rate charts, Customizable currency lists, Minimal interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads – Monthly | $1.99 | per month |
| No Ads – Yearly | $11.99 | per year |


## Frequently asked questions

### Is CO2 Tracker free?

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

### Is Currencies free?

Currencies is free to download, with in-app purchases available.

### Which has better reviews, CO2 Tracker or Currencies?

CO2 Tracker is rated higher. CO2 Tracker averages 5.0 out of 5 from 3 ratings, while Currencies averages 4.7 from 56 ratings.

### Do CO2 Tracker or Currencies have ads?

Currencies shows ads; CO2 Tracker does not.

### Which is updated more often, CO2 Tracker or Currencies?

CO2 Tracker ships an update every 3 months, and Currencies every 2 weeks. Most recently, CO2 Tracker was updated on October 24, 2026 and Currencies on October 24, 2026.

---

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