# ZZZ HostLink vs DB RelationalAlgebra

The clearest difference is in-app purchases: DB RelationalAlgebra at none against ZZZ HostLink's 2. DB RelationalAlgebra also leads on update cadence (fortnightly vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ZZZ HostLink sells 1 in-app purchase, starting at $0.99 per month. DB RelationalAlgebra asks for nothing beyond the download.

ZZZ HostLink ships an update every 6 weeks, DB RelationalAlgebra fortnightly. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ZZZ HostLink | DB RelationalAlgebra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Size | 9 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SMOLT STAGE, K.K.](https://appshunter.io/developer/1708601451) | [Artur Borycki](https://appshunter.io/developer/6792125744) |

## What reviewers say

### ZZZ HostLink

[App page](https://appshunter.io/ios/app/zzz-hostlink/id6778269713)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZZZ HostLink Premium | $0.99 | per month |


### DB RelationalAlgebra

[App page](https://appshunter.io/ios/app/db-relationalalgebra/id6792125742)

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

**In-app purchases:** none


## Frequently asked questions

### Is ZZZ HostLink free?

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

### Is DB RelationalAlgebra free?

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

### Do ZZZ HostLink or DB RelationalAlgebra have ads?

Neither ZZZ HostLink nor DB RelationalAlgebra shows ads.

### Which is updated more often, ZZZ HostLink or DB RelationalAlgebra?

ZZZ HostLink ships an update every 6 weeks, and DB RelationalAlgebra fortnightly. Most recently, ZZZ HostLink was updated on October 20, 2026 and DB RelationalAlgebra on October 7, 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.*