# Sociometry vs Zertifly

The clearest difference is in-app purchases: Sociometry at none against Zertifly's 1. Sociometry also leads on iOS requirement (9.0 vs 15.1). Zertifly's advantage is update cadence (every 2 weeks vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Zertifly sells 1 in-app purchase, starting at $14.99 per month. Sociometry asks for nothing beyond the download.

Sociometry ships an update monthly, Zertifly every 2 weeks. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Sociometry | Zertifly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/zertifly/id6799956740/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 41 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BMSLAB Utwente](https://appshunter.io/developer/1229896852) | [Zertifly LTD](https://appshunter.io/developer/6799956742) |

## What reviewers say

### Sociometry

[App page](https://appshunter.io/ios/app/sociometry/id1448345645)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zertifly

[App page](https://appshunter.io/ios/app/zertifly/id6799956740)

Prepare for German language exams like TestDaF, Goethe, and telc with structured exercises for reading, listening, writing, and speaking. Features vocabulary tools, progress tracking, and personalized feedback to enhance your learning journey.

**Highlights:** Reading and listening practice, Writing and speaking exercises, German vocabulary study tools, Exam-focused practice activities, Progress and skill tracking, Personalized learning support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zertifly Pro Monthly | $14.99 | per month |


## Frequently asked questions

### Is Sociometry free?

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

### Is Zertifly free?

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

### Do Sociometry or Zertifly have ads?

Neither Sociometry nor Zertifly shows ads.

### Which is updated more often, Sociometry or Zertifly?

Sociometry ships an update monthly, and Zertifly every 2 weeks. Most recently, Sociometry was updated on October 6, 2026 and Zertifly on October 15, 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.*