# Surface Time vs PD Meter

The clearest difference is in-app purchases: PD Meter at none against Surface Time's 1. Surface Time's advantage is ads (none vs shown) and ratings volume (3 vs 1). On price, rating, update cadence and device support there is nothing between them.

Both are free to download. Surface Time sells 1 one-off in-app purchase. PD Meter asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Surface Time against 5.0 for PD Meter. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Surface Time ships an update weekly, PD Meter every 4 days. The most recent releases landed on October 5, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Surface Time | PD Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/surface-time/id6747015704/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/pd-meter-pupillary-distance/id6784830581/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | **Free** | Ad-supported |
| Size | 17 MB | 65 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Neel Makhecha](https://appshunter.io/developer/1353167736) | [heekyung moon](https://appshunter.io/developer/6779193748) |

## What reviewers say

### Surface Time

[App page](https://appshunter.io/ios/app/surface-time/id6747015704)

This app encourages you to put your phone down with an intuitive, button-free timer. It uses subtle haptics and visual cues to guide you, and offers unique notification options like LED flash or calming sounds. Track your progress towards daily goals and customize them for different tasks.

**Highlights:** Button-free timer operation, Intuitive haptic feedback, Visual timer progression, LED flash notifications, Calming sound alerts, Customizable daily goals, Progress tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Surface - One Time Purchase | $5.99 | one-time |


### PD Meter

[App page](https://appshunter.io/ios/app/pd-meter-pupillary-distance/id6784830581)

Easily measure your pupillary distance (PD) at home using your phone's camera and a standard card for scale. Get a quick, repeatable estimate in millimeters to order glasses online accurately. The app guides you through the process for reliable results.

**Highlights:** Measure PD with phone camera, Use standard card for scale, Get PD in millimeters, Guided measurement process, Repeatable results for confidence, Single (binocular) PD measurement

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Surface Time free?

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

### Is PD Meter free?

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

### Which has better reviews, Surface Time or PD Meter?

Surface Time and PD Meter are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Surface Time or PD Meter have ads?

PD Meter shows ads; Surface Time does not.

### Which is updated more often, Surface Time or PD Meter?

Surface Time ships an update weekly, and PD Meter every 4 days. Most recently, Surface Time was updated on October 5, 2026 and PD Meter on October 17, 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.*