# Underpin vs Chizmis

The clearest difference is update cadence: Chizmis at every 4 days against Underpin's every 10 days. Chizmis also leads on iOS requirement (13.0 vs 15.0). 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.

Underpin ships an update every 10 days, Chizmis every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Underpin | Chizmis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/underpin/id1438111455/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Free | — |
| Size | 22 MB | 64 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Underpin, Inc.](https://appshunter.io/developer/1292004832) | [Centralized Cloud Computing International Inc.](https://appshunter.io/developer/1681958692) |

## What reviewers say

### Underpin

[App page](https://appshunter.io/ios/app/underpin/id1438111455)

Discover and share trusted travel experiences with a global community. Document favorite places, plan adventures, and connect with locals for authentic recommendations. Supports local communities and small businesses.

**Highlights:** Drop pins anywhere globally, Plan travel adventures and meetups, Research on-the-go with map filters, Discover local and off-the-beaten-track places, Connect with a global network of trusted contacts, Curate travel journals and save favorites, Support local communities and small businesses

**In-app purchases:** none


### Chizmis

[App page](https://appshunter.io/ios/app/chizmis/id6447598800)

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

**In-app purchases:** none


## Frequently asked questions

### Is Underpin free?

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

### Is Chizmis free?

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

### Do Underpin or Chizmis have ads?

Neither Underpin nor Chizmis shows ads.

### Which is updated more often, Underpin or Chizmis?

Underpin ships an update every 10 days, and Chizmis every 4 days. Most recently, Underpin was updated on October 24, 2026 and Chizmis on October 24, 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.*