# Art Reference vs Gridline

The clearest difference is in-app purchases: Art Reference at none against Gridline's 1. Art Reference also leads on ads (none vs shown). Gridline's advantage is iOS requirement (13.0 vs 26.0). On price and device support there is nothing between them.

Both are free to download. Gridline sells 1 one-off in-app purchase. Art Reference asks for nothing beyond the download.

## The numbers

| Metric | Art Reference | Gridline |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 181 MB | 24 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gil Osborne](https://appshunter.io/developer/1135987694) | [Sangwon Kim](https://appshunter.io/developer/1677937052) |

## What reviewers say

### Art Reference

[App page](https://appshunter.io/ios/app/art-reference-value-study/id6802393157)

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

**In-app purchases:** none


### Gridline

[App page](https://appshunter.io/ios/app/gridline-grid-and-value-study/id6816087951)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gridline Pro | $3.99 | one-time |


## Frequently asked questions

### Is Art Reference free?

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

### Is Gridline free?

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

### Do Art Reference or Gridline have ads?

Gridline shows ads; Art Reference does not.

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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.*