# swrm vs GreenTrax

The clearest difference is rating: GreenTrax at 5.0 against swrm's 4.3. GreenTrax also leads on update cadence (every 5 weeks vs every 9 months). swrm's advantage is in-app purchases (none vs 4) and ratings volume (6 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. GreenTrax sells 4 one-off in-app purchases. swrm asks for nothing beyond the download.

GreenTrax holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: swrm has 6 ratings behind it against 1, so its average is the more settled of the two.

swrm ships an update every 9 months, GreenTrax every 5 weeks. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | swrm | GreenTrax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/swrm/id1437980734/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/greentrax/id6742363398/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 124 MB | 2 MB |
| Requires iOS | **10.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Greenswrm, Inc.](https://appshunter.io/developer/1483955354) | [Brian Buck](https://appshunter.io/developer/999869732) |

## What reviewers say

### swrm

[App page](https://appshunter.io/ios/app/swrm/id1437980734)

Track your carbon footprint and adopt a more sustainable lifestyle. This app offers a comprehensive calculator, educational resources, and community challenges to help you reduce your environmental impact. Monitor groceries, transportation, and household energy use.

**Highlights:** Carbon footprint calculator, Grocery barcode scanning, Vehicle and transportation tracking, Household appliance impact, Community challenges, Educational articles and videos

**Features:** macOS Compatibility

**In-app purchases:** none


### GreenTrax

[App page](https://appshunter.io/ios/app/greentrax/id6742363398)

This app records your human-powered journeys, calculating your carbon footprint reduction. It visualizes your progress with charts and savings equivalents, and can import commute data from Strava.

**Highlights:** Tracks human-powered commutes, Calculates carbon savings, Displays savings equivalencies, Visualizes data with charts, Strava read-only import

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nice Donation | $0.99 | one-time |
| Big Donation | $4.99 | one-time |
| Generous Donation | $9.99 | one-time |
| Supporter Donation | $19.99 | one-time |


## Frequently asked questions

### Is swrm free?

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

### Is GreenTrax free?

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

### Which has better reviews, swrm or GreenTrax?

GreenTrax is rated higher. swrm averages 4.3 out of 5 from 6 ratings, while GreenTrax averages 5.0 from 1 ratings.

### Do swrm or GreenTrax have ads?

Neither swrm nor GreenTrax shows ads.

### Which is updated more often, swrm or GreenTrax?

swrm ships an update every 9 months, and GreenTrax every 5 weeks. Most recently, swrm was updated on October 12, 2026 and GreenTrax on October 13, 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.*