# Orevan Events vs TSS WESTIMATION

The clearest difference is iOS requirement: Orevan Events at 13.0 against TSS WESTIMATION's 15.5. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Orevan Events | TSS WESTIMATION |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Size | 59 MB | 9 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OREVAN LLC](https://appshunter.io/developer/1838424462) | [Vijay Makani](https://appshunter.io/developer/1821470132) |

## What reviewers say

### Orevan Events

[App page](https://appshunter.io/ios/app/orevan-events/id1539934668)

**Features:** macOS Compatibility

**In-app purchases:** none


### TSS WESTIMATION

[App page](https://appshunter.io/ios/app/tss-westimation/id6753621054)

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

**In-app purchases:** none


## Frequently asked questions

### Is Orevan Events free?

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

### Is TSS WESTIMATION free?

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

### Do Orevan Events or TSS WESTIMATION have ads?

Neither Orevan Events nor TSS WESTIMATION shows ads.

### Which is updated more often, Orevan Events or TSS WESTIMATION?

Orevan Events ships an update monthly, and TSS WESTIMATION monthly. Most recently, Orevan Events was updated on October 12, 2026 and TSS WESTIMATION 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.*