# Groups vs Magnetometer ∞

The clearest difference is price: Magnetometer ∞ at Free against Groups's $0.99. Magnetometer ∞ also leads on update cadence (every 10 days vs every 3 months) and rating (4.4 vs 4.2). Groups's advantage is in-app purchases (none vs 2) and ads (none vs shown).

Magnetometer ∞ is free to download; Groups costs $0.99 up front. Magnetometer ∞ sells 2 in-app purchases, starting at $1.99 per 7 days. Groups asks for nothing beyond the download.

Magnetometer ∞ holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: Magnetometer ∞ has 56 ratings behind it against 5, so its average is the more settled of the two.

Groups ships an update every 3 months, Magnetometer ∞ every 10 days. The most recent releases landed on September 17, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Groups | Magnetometer ∞ |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/groups-emailgroups/id968763251/reviews) | **[4.4 (56 ratings)](https://appshunter.io/ios/app/magnetometer/id6753061844/reviews)** |
| Number of ratings | 5 | **56** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 16 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kevin Marshall](https://appshunter.io/developer/544647717) | [Fawkes Wei](https://appshunter.io/developer/432767536) |

## What reviewers say

### Groups

[App page](https://appshunter.io/ios/app/groups-emailgroups/id968763251)

Easily send emails to entire contact groups without individually adding each recipient. Create, edit, and manage contact groups for efficient communication.

**Highlights:** Create and edit contact groups, Send bulk emails to groups, Automatically adds group members to email, Edit group titles, Launch from Contacts app, Safeguards to protect existing contacts

**Features:** macOS Compatibility

**In-app purchases:** none


### Magnetometer ∞

[App page](https://appshunter.io/ios/app/magnetometer/id6753061844)

Visualize magnetic fields in real-time with precision charts and monitor X, Y, Z axis readings. Ideal for scientific research, education, and field work, this app offers professional-grade accuracy and an intuitive interface for easy data interpretation.

**Highlights:** Real-time magnetic field visualization, X, Y, Z axis readings in microteslas, Scientific research tool, Educational aid, Field work companion, Intuitive interface

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Groups free?

Groups costs $0.99, with no in-app purchases.

### Is Magnetometer ∞ free?

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

### Which has better reviews, Groups or Magnetometer ∞?

Magnetometer ∞ is rated higher. Groups averages 4.2 out of 5 from 5 ratings, while Magnetometer ∞ averages 4.4 from 56 ratings.

### Do Groups or Magnetometer ∞ have ads?

Magnetometer ∞ shows ads; Groups does not.

### Which is updated more often, Groups or Magnetometer ∞?

Groups ships an update every 3 months, and Magnetometer ∞ every 10 days. Most recently, Groups was updated on September 17, 2026 and Magnetometer ∞ on September 25, 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.*