# PD Measure Ruler vs Max Read

The clearest difference is update cadence: PD Measure Ruler at every 6 days against Max Read's fortnightly. PD Measure Ruler also leads on iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. PD Measure Ruler sells 4 in-app purchases, starting at $2.99 per 7 days and Max Read sells 2 in-app purchases, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.

PD Measure Ruler ships an update every 6 days, Max Read fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | PD Measure Ruler | Max Read |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (41 ratings)](https://appshunter.io/ios/app/pd-measure-ruler/id6670557555/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | 27.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 24 MB | 2 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [Sensonet](https://appshunter.io/developer/793745582) |

## What reviewers say

### PD Measure Ruler

[App page](https://appshunter.io/ios/app/pd-measure-ruler/id6670557555)

Accurately measure your pupillary distance (PD) for eyeglasses and VR headsets. Offers both manual and automatic measurement modes for precise results. Optimize your eyewear fit with this user-friendly tool.

**Highlights:** Manual PD measurement, Automatic PD measurement, Accurate and precise readings, User-friendly interface, Eyeglass fitting assistance, VR headset adjustment

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Weekly | $4.99 | per 7 days |
| Weekly | $7.99 | per 7 days |
| Monthly | $14.99 | per month |


### Max Read

[App page](https://appshunter.io/ios/app/max-read-read-faster/id6791105521)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Yearly | $1.99 | per year |
| Max Read Lifetime | $5.99 | one-time |


## Frequently asked questions

### Is PD Measure Ruler free?

PD Measure Ruler is free to download, with in-app purchases available.

### Is Max Read free?

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

### Do PD Measure Ruler or Max Read have ads?

Neither PD Measure Ruler nor Max Read shows ads.

### Which is updated more often, PD Measure Ruler or Max Read?

PD Measure Ruler ships an update every 6 days, and Max Read fortnightly. Most recently, PD Measure Ruler was updated on October 24, 2026 and Max Read on October 25, 2026.

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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.*