# 1byone Relief vs PSMailbox

The clearest difference is review sentiment: 1byone Relief at 25% against PSMailbox's 0%. 1byone Relief also leads on iOS requirement (8.0 vs 14.2). PSMailbox's advantage is rating (3.5 vs 3.3). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PSMailbox holds the better App Store score, 3.5 against 3.3. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews complicate that: 25% of 1byone Relief's written reviews are positive against 0% of PSMailbox's, so the app with the better star average is not the one people write more warmly about.

1byone Relief ships an update every 5 weeks, PSMailbox every 2 months. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | 1byone Relief | PSMailbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (3 ratings)](https://appshunter.io/ios/app/1byone-relief/id1237553153/reviews) | **[3.5 (4 ratings)](https://appshunter.io/ios/app/psmailbox/id1441340249/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 6 MB | 42 MB |
| Requires iOS | **8.0** | 14.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [JKH HEALTH CO., LTD.](https://appshunter.io/developer/1460435216) | [Argonaut Quality Systems Inc.](https://appshunter.io/developer/1441225619) |

## What reviewers say

### 1byone Relief

[App page](https://appshunter.io/ios/app/1byone-relief/id1237553153)

This application works with a specific hardware device to manage TENS therapy. It allows users to control vibration frequencies and track treatment data for pain relief.

**Highlights:** Control vibration frequency, Record treatment data, Manage TENS therapy device, Pain relief tracking, Hardware integration

**Features:** macOS Compatibility

**In-app purchases:** none


### PSMailbox

[App page](https://appshunter.io/ios/app/psmailbox/id1441340249)

Access your secure email, cloud storage, and calendar from a single application. Enjoy the full functionality of your PSMail.net account on your mobile devices.

**Highlights:** Secure email access, Cloud storage integration, Calendar management, Online account access, Mobile functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 1byone Relief free?

1byone Relief is free to download, with no in-app purchases.

### Is PSMailbox free?

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

### Which has better reviews, 1byone Relief or PSMailbox?

PSMailbox is rated higher. 1byone Relief averages 3.3 out of 5 from 3 ratings, while PSMailbox averages 3.5 from 4 ratings.

### Do 1byone Relief or PSMailbox have ads?

Neither 1byone Relief nor PSMailbox shows ads.

### Which is updated more often, 1byone Relief or PSMailbox?

1byone Relief ships an update every 5 weeks, and PSMailbox every 2 months. Most recently, 1byone Relief was updated on October 7, 2026 and PSMailbox on October 1, 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.*