# ESL assistant vs 优博讯K31固件升级

The clearest difference is iOS requirement: ESL assistant at 12.0 against 优博讯K31固件升级's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 10, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | ESL assistant | 优博讯K31固件升级 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Size | 22 MB | 0 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yaliang Software Development Co., Ltd.](https://appshunter.io/developer/1104844863) | [UROVO TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1674303082) |

## What reviewers say

### ESL assistant

[App page](https://appshunter.io/ios/app/esl-assistant/id1565463349)

**Features:** macOS Compatibility

**In-app purchases:** none


### 优博讯K31固件升级

[App page](https://appshunter.io/ios/app/k31/id6745995670)

**In-app purchases:** none


## Frequently asked questions

### Is ESL assistant free?

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

### Is 优博讯K31固件升级 free?

优博讯K31固件升级 is free to download, with no in-app purchases.

### Do ESL assistant or 优博讯K31固件升级 have ads?

Neither ESL assistant nor 优博讯K31固件升级 shows ads.

### Which is updated more often, ESL assistant or 优博讯K31固件升级?

ESL assistant ships an update every 4 months, and 优博讯K31固件升级 every 4 months. Most recently, ESL assistant was updated on September 10, 2026 and 优博讯K31固件升级 on September 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.*