# ESF Mobile vs ReadFast

The clearest difference is update cadence: ESF Mobile at fortnightly against ReadFast's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

ESF Mobile ships an update fortnightly, ReadFast every 5 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | ESF Mobile | ReadFast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.3 (3 ratings)](https://appshunter.io/ios/app/readfast-speed-read-anything/id6756295327/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | — | Free |
| Size | 87 MB | 61 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UC Merced](https://appshunter.io/developer/1148124271) | [Leo Cui](https://appshunter.io/developer/1747685169) |

## What reviewers say

### ESF Mobile

[App page](https://appshunter.io/ios/app/esf-mobile/id6752670873)

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

**In-app purchases:** none


### ReadFast

[App page](https://appshunter.io/ios/app/readfast-speed-read-anything/id6756295327)

Enhance your reading speed with a unique word-flashing technique. This utility app presents words sequentially at a rapid pace to improve comprehension and efficiency.

**Highlights:** Rapid Serial Visual Presentation (RSVP), Word-by-word flashing, Improved reading speed, Enhanced comprehension, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ESF Mobile free?

ESF Mobile is free to download, with no in-app purchases.

### Is ReadFast free?

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

### Do ESF Mobile or ReadFast have ads?

Neither ESF Mobile nor ReadFast shows ads.

### Which is updated more often, ESF Mobile or ReadFast?

ESF Mobile ships an update fortnightly, and ReadFast every 5 weeks. Most recently, ESF Mobile was updated on October 30, 2026 and ReadFast on October 30, 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.*