# Study852 vs MarinerDocs Vault

The clearest difference is iOS requirement: MarinerDocs Vault at 16.1 against Study852's 18.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Study852 sells 1 one-off in-app purchase and MarinerDocs Vault sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Study852 | MarinerDocs Vault |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/study852/id6736966480/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 11 days |
| Monetization | Free with in-app purchases | — |
| Size | 139 MB | 88 MB |
| Requires iOS | 18.0 | **16.1** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Daisydoor](https://appshunter.io/developer/1755831368) | [Patrick Ryan](https://appshunter.io/developer/1891389691) |

## What reviewers say

### Study852

[App page](https://appshunter.io/ios/app/study852/id6736966480)

This productivity tool features a timer that plays an 852hz pure tone while active. It's designed to enhance focus during study sessions and can be upgraded for extended timer durations.

**Highlights:** 852hz pure tone playback, Timer for focus sessions, Pause and stop functionality, Extended timer options (PRO), No data collection

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $0.99 | one-time |


### MarinerDocs Vault

[App page](https://appshunter.io/ios/app/marinerdocs-vault/id6761772560)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MarinerDocs Vault Pro- Monthly | $1.99 | per month |
| MarinerDocs Vault Pro- Annual | $9.99 | per year |


## Frequently asked questions

### Is Study852 free?

Study852 is free to download, with in-app purchases available.

### Is MarinerDocs Vault free?

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

### Do Study852 or MarinerDocs Vault have ads?

Neither Study852 nor MarinerDocs Vault shows ads.

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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.*