# Flex vs FlowReader Pro

The clearest difference is ads: FlowReader Pro at none against Flex's shown. FlowReader Pro also leads on update cadence (every 4 days vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Flex sells 1 in-app purchase, starting at $9.99 per year and FlowReader Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Flex ships an update every 4 months, FlowReader Pro every 4 days. The most recent releases landed on September 9, 2026 and June 29, 2026 respectively.

## The numbers

| Metric | Flex | FlowReader Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flowreader-pro/id6762098968/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 78 MB | 5 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NYNOTECH AS](https://appshunter.io/developer/1740126185) | [ANDREAS STEINER](https://appshunter.io/developer/1892898516) |

## What reviewers say

### Flex

[App page](https://appshunter.io/ios/app/flex-time/id6463633151)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro yearly | $9.99 | per year |


### FlowReader Pro

[App page](https://appshunter.io/ios/app/flowreader-pro/id6762098968)

Enhance your reading speed and comprehension with a unique RSVP method that displays words one at a time. Import content from various sources, including EPUB files and web articles, and enjoy offline access. This app offers a one-time purchase for lifetime access to all features and future updates.

**Highlights:** RSVP speed-reading technology, Adjustable reading speed (100-1000 WPM), EPUB file import, Article URL import, Offline functionality, One-time purchase for lifetime access

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Freischaltung | $2.99 | one-time |


## Frequently asked questions

### Is Flex free?

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

### Is FlowReader Pro free?

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

### Do Flex or FlowReader Pro have ads?

Flex shows ads; FlowReader Pro does not.

### Which is updated more often, Flex or FlowReader Pro?

Flex ships an update every 4 months, and FlowReader Pro every 4 days. Most recently, Flex was updated on September 9, 2026 and FlowReader Pro on June 29, 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.*