# PHD Helper vs Scollr

The clearest difference is in-app purchases: Scollr at none against PHD Helper's 1. Scollr also leads on device support. On price and iOS requirement there is nothing between them.

Both are free to download. PHD Helper sells 1 one-off in-app purchase. Scollr asks for nothing beyond the download.

## The numbers

| Metric | PHD Helper | Scollr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | — | No |
| Update frequency | — | Fortnightly |
| Size | 41 MB | 32 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lauren Gilman](https://appshunter.io/developer/1880124860) | [Chris Colpitts](https://appshunter.io/developer/1892198601) |

## What reviewers say

### PHD Helper

[App page](https://appshunter.io/ios/app/phd-helper/id6760105075)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Me A Coffee | $4.99 | one-time |


### Scollr

[App page](https://appshunter.io/ios/app/scollr-research-papers/id6761957461)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PHD Helper free?

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

### Is Scollr free?

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

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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.*