# RTB BLX vs Synapse ITS

The clearest difference is update cadence: Synapse ITS at every 3 weeks against RTB BLX's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

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

RTB BLX ships an update every 7 months, Synapse ITS every 3 weeks. The most recent releases landed on May 14, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | RTB BLX | Synapse ITS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Size | 35 MB | 59 MB |
| Requires iOS | 16.6 | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RTB Elektronik GmbH & Co. KG](https://appshunter.io/developer/1033533477) | [VSC Synapse LLC](https://appshunter.io/developer/1730206427) |

## What reviewers say

### RTB BLX

[App page](https://appshunter.io/ios/app/rtb-blx/id1524448175)

**In-app purchases:** none


### Synapse ITS

[App page](https://appshunter.io/ios/app/synapse-its/id6751772717)

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

**In-app purchases:** none


## Frequently asked questions

### Is RTB BLX free?

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

### Is Synapse ITS free?

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

### Do RTB BLX or Synapse ITS have ads?

Neither RTB BLX nor Synapse ITS shows ads.

### Which is updated more often, RTB BLX or Synapse ITS?

RTB BLX ships an update every 7 months, and Synapse ITS every 3 weeks. Most recently, RTB BLX was updated on May 14, 2026 and Synapse ITS on September 14, 2026.

---

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