# MK Flex vs Tax Document Organizer

The clearest difference is in-app purchases: MK Flex at none against Tax Document Organizer's 3. MK Flex also leads on device support (3 vs 1) and iOS requirement (14 vs 18). Tax Document Organizer's advantage is update cadence (every 2 months vs every 53 months). On price and ads there is nothing between them.

Both are free to download. Tax Document Organizer sells 3 in-app purchases, starting at $4.99 per month. MK Flex asks for nothing beyond the download.

MK Flex ships an update every 53 months, Tax Document Organizer every 2 months. The most recent releases landed on September 21, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | MK Flex | Tax Document Organizer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 53 months | **Every 2 months** |
| Size | 7 MB | 10 MB |
| Requires iOS | **14** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bendy B.V.](https://appshunter.io/developer/1489975123) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## What reviewers say

### MK Flex

[App page](https://appshunter.io/ios/app/mk-flex/id1614622913)

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

**In-app purchases:** none


### Tax Document Organizer

[App page](https://appshunter.io/ios/app/tax-document-organizer-april/id6760435672)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Annual | $39.99 | per year |
| Annual - Intro Offer | $39.99 | per year |


## Frequently asked questions

### Is MK Flex free?

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

### Is Tax Document Organizer free?

Tax Document Organizer is free to download, with in-app purchases available.

### Do MK Flex or Tax Document Organizer have ads?

Neither MK Flex nor Tax Document Organizer shows ads.

### Which is updated more often, MK Flex or Tax Document Organizer?

MK Flex ships an update every 53 months, and Tax Document Organizer every 2 months. Most recently, MK Flex was updated on September 21, 2026 and Tax Document Organizer on October 28, 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.*