# SI Converter vs Maintain

The clearest difference is in-app purchases: SI Converter at none against Maintain's 1. Maintain's advantage is ads (none vs shown) and update cadence (daily vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Maintain sells 1 one-off in-app purchase. SI Converter asks for nothing beyond the download.

SI Converter ships an update every 2 months, Maintain daily. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | SI Converter | Maintain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Daily** |
| Size | 4 MB | 5 MB |
| Requires iOS | 17.2 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ramon A. Marchante Castellanos](https://appshunter.io/developer/1735326162) | [Ezar Ahrend](https://appshunter.io/developer/6795534406) |

## What reviewers say

### SI Converter

[App page](https://appshunter.io/ios/app/si-converter/id6504356195)

**Features:** macOS Compatibility

**In-app purchases:** none


### Maintain

[App page](https://appshunter.io/ios/app/maintain-asset-tracker/id6795534404)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Maintain Pro Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is SI Converter free?

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

### Is Maintain free?

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

### Do SI Converter or Maintain have ads?

SI Converter shows ads; Maintain does not.

### Which is updated more often, SI Converter or Maintain?

SI Converter ships an update every 2 months, and Maintain daily. Most recently, SI Converter was updated on October 5, 2026 and Maintain on October 6, 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.*