# iSolergo vs sZephyr

The clearest difference is update cadence: sZephyr at every 5 weeks against iSolergo's every 9 months. iSolergo's advantage is iOS requirement (11.0 vs 14.0). 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.

iSolergo ships an update every 9 months, sZephyr every 5 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | iSolergo | sZephyr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 weeks** |
| Size | 63 MB | 43 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Electro Graphics Srl](https://appshunter.io/developer/542354467) | [IINVSYS Private LIMITED](https://appshunter.io/developer/1638898570) |

## What reviewers say

### iSolergo

[App page](https://appshunter.io/ios/app/isolergo/id542354464)

**Features:** macOS Compatibility

**In-app purchases:** none


### sZephyr

[App page](https://appshunter.io/ios/app/szephyr/id6447295364)

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

**In-app purchases:** none


## Frequently asked questions

### Is iSolergo free?

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

### Is sZephyr free?

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

### Do iSolergo or sZephyr have ads?

Neither iSolergo nor sZephyr shows ads.

### Which is updated more often, iSolergo or sZephyr?

iSolergo ships an update every 9 months, and sZephyr every 5 weeks. Most recently, iSolergo was updated on November 1, 2026 and sZephyr on November 3, 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.*