# Solr vs MoodMetrics Study

The clearest difference is in-app purchases: MoodMetrics Study at none against Solr's 3. MoodMetrics Study also leads on ads (none vs shown) and update cadence (fortnightly vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Solr sells 3 in-app purchases, starting at $9.99 per month. MoodMetrics Study asks for nothing beyond the download.

Solr ships an update every 5 weeks, MoodMetrics Study fortnightly. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Solr | MoodMetrics Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Size | 79 MB | 167 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [EVOY LTD](https://appshunter.io/developer/1877505988) | [Avicenna Research Inc.](https://appshunter.io/developer/1137173051) |

## What reviewers say

### Solr

[App page](https://appshunter.io/ios/app/solr-affirmations-screen-time/id6759221559)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Yearly | $29.99 | per year |
| Yearly | $29.99 | per year |


### MoodMetrics Study

[App page](https://appshunter.io/ios/app/moodmetrics-study/id6777770007)

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

**In-app purchases:** none


## Frequently asked questions

### Is Solr free?

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

### Is MoodMetrics Study free?

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

### Do Solr or MoodMetrics Study have ads?

Solr shows ads; MoodMetrics Study does not.

### Which is updated more often, Solr or MoodMetrics Study?

Solr ships an update every 5 weeks, and MoodMetrics Study fortnightly. Most recently, Solr was updated on October 28, 2026 and MoodMetrics Study 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.*