# Researchist vs Stackby App

The clearest difference is in-app purchases: Stackby App at none against Researchist's 1. Stackby App also leads on iOS requirement (15.1 vs 27.0). On price, ads and device support there is nothing between them.

Both are free to download. Researchist sells 1 in-app purchase, starting at $39.99 per year. Stackby App asks for nothing beyond the download.

## The numbers

| Metric | Researchist | Stackby App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Size | 113 MB | 53 MB |
| Requires iOS | 27.0 | **15.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Essayist Software Inc.](https://appshunter.io/developer/1537845386) | [Relytree Technologies Pvt. Ltd](https://appshunter.io/developer/1528175769) |

## What reviewers say

### Researchist

[App page](https://appshunter.io/ios/app/researchist-pdf-reader/id6749282472)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Researchist Pro (Yearly) | $39.99 | per year |


### Stackby App

[App page](https://appshunter.io/ios/app/stackby-app/id6790438013)

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

**In-app purchases:** none


## Frequently asked questions

### Is Researchist free?

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

### Is Stackby App free?

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

### Do Researchist or Stackby App have ads?

Neither Researchist nor Stackby App 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.*