# Isobar vs px.

The clearest difference is in-app purchases: Isobar at none against px.'s 2. px.'s advantage is update cadence (every 3 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. px. sells 2 in-app purchases, starting at $29.99 per month. Isobar asks for nothing beyond the download.

Isobar ships an update every 2 months, px. every 3 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Isobar | px. |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 73 MB | 250 MB |
| Requires iOS | 16.4 | 16.4 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Advanced Therapeutic Materials Ltd](https://appshunter.io/developer/1717644630) | [Pursue Excellence Ltd](https://appshunter.io/developer/1889029674) |

## What reviewers say

### Isobar

[App page](https://appshunter.io/ios/app/isobar/id6477287729)

Design and order custom-fit compression socks from home. This app uses your phone's camera to create a 3D model of your legs for a perfect fit, helping to reduce DVT risk and alleviate travel-related leg discomfort.

**Highlights:** Custom compression sock ordering, 3D leg scanning via mobile video, Personalized fit and style selection, Direct-to-door delivery, DVT risk reduction, Alleviate heavy legs and jet lag

**Features:** Apple Wallet

**In-app purchases:** none


### px.

[App page](https://appshunter.io/ios/app/px/id6761346152)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| px membership: monthly | $29.99 | per month |
| px membership: annual | $199.00 | per year |


## Frequently asked questions

### Is Isobar free?

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

### Is px. free?

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

### Do Isobar or px. have ads?

Neither Isobar nor px. shows ads.

### Which is updated more often, Isobar or px.?

Isobar ships an update every 2 months, and px. every 3 days. Most recently, Isobar was updated on October 24, 2026 and px. on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*