# Convert FX vs Sub Sook

The clearest difference is iOS requirement: Sub Sook at 16.4 against Convert FX's 18.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Convert FX sells 1 one-off in-app purchase and Sub Sook sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Convert FX | Sub Sook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/convert-fx-currency-rates/id6768726063/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 68 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dmytro Polokhalo](https://appshunter.io/developer/1873442365) | [Phaisan Thauaonsamut](https://appshunter.io/developer/6773761501) |

## What reviewers say

### Convert FX

[App page](https://appshunter.io/ios/app/convert-fx-currency-rates/id6768726063)

This app offers a fast and simple way to convert between global currencies. Track exchange rates, save favorites, and view trends with a clean, native iOS interface. It's ideal for travelers, international shoppers, and market watchers.

**Highlights:** Simple currency conversion, Exchange rate tracking, Favorite currency pairs, Clean charts and trends, Home Screen widgets, Dark mode support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Convert FX Pro | $2.99 | one-time |


### Sub Sook

[App page](https://appshunter.io/ios/app/sub-sook-subscription-tracker/id6773767655)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $1.99 | per month |
| Premium (Yearly) | $19.99 | per year |


## Frequently asked questions

### Is Convert FX free?

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

### Is Sub Sook free?

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

### Do Convert FX or Sub Sook have ads?

Neither Convert FX nor Sub Sook shows ads.

### Which is updated more often, Convert FX or Sub Sook?

Convert FX ships an update every 2 weeks, and Sub Sook every 2 weeks. Most recently, Convert FX was updated on October 24, 2026 and Sub Sook on October 7, 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.*