# brid.zzz vs SleepisolBio

The clearest difference is update cadence: SleepisolBio at every 10 days against brid.zzz's every 3 weeks. brid.zzz's advantage is iOS requirement (13.0 vs 15.6). 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.

brid.zzz ships an update every 3 weeks, SleepisolBio every 10 days. The most recent releases landed on September 28, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | brid.zzz | SleepisolBio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Size | 78 MB | 1.1 GB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [SLEEPWAVE INC.](https://appshunter.io/developer/1635861891) | [leesol](https://appshunter.io/developer/1584929445) |

## What reviewers say

### brid.zzz

[App page](https://appshunter.io/ios/app/bridzzz/id6449228010)

**In-app purchases:** none


### SleepisolBio

[App page](https://appshunter.io/ios/app/sleepisolbio/id6739985543)

**In-app purchases:** none


## Frequently asked questions

### Is brid.zzz free?

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

### Is SleepisolBio free?

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

### Do brid.zzz or SleepisolBio have ads?

Neither brid.zzz nor SleepisolBio shows ads.

### Which is updated more often, brid.zzz or SleepisolBio?

brid.zzz ships an update every 3 weeks, and SleepisolBio every 10 days. Most recently, brid.zzz was updated on September 28, 2026 and SleepisolBio on October 11, 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.*