# Tavio vs System Design Refresher

The clearest difference is in-app purchases: System Design Refresher at none against Tavio's 3. Tavio's advantage is update cadence (every 8 days vs monthly) and iOS requirement (13.0 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. Tavio sells 3 in-app purchases, starting at $4.99 per month. System Design Refresher asks for nothing beyond the download.

Tavio ships an update every 8 days, System Design Refresher monthly. The most recent releases landed on October 19, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Tavio | System Design Refresher |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Monthly |
| Size | 69 MB | 18 MB |
| Requires iOS | **13.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rashad Shirizada](https://appshunter.io/developer/1448917602) | [Saurabh Sharma](https://appshunter.io/developer/1883599017) |

## What reviewers say

### Tavio

[App page](https://appshunter.io/ios/app/tavio-practice-knowledge/id6754820663)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly Subsciption | $39.99 | per year |
| 50 Hearts Pack | $0.99 | one-time |


### System Design Refresher

[App page](https://appshunter.io/ios/app/system-design-refresher/id6760277935)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tavio free?

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

### Is System Design Refresher free?

System Design Refresher is free to download, with no in-app purchases.

### Do Tavio or System Design Refresher have ads?

Neither Tavio nor System Design Refresher shows ads.

### Which is updated more often, Tavio or System Design Refresher?

Tavio ships an update every 8 days, and System Design Refresher monthly. Most recently, Tavio was updated on October 19, 2026 and System Design Refresher on September 30, 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.*