# 优博讯K31固件升级 vs 凌云志fpvtop

The clearest difference is update cadence: 凌云志fpvtop at every 5 weeks against 优博讯K31固件升级's every 4 months. 凌云志fpvtop also leads on iOS requirement (13.0 vs 15.0). 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.

优博讯K31固件升级 ships an update every 4 months, 凌云志fpvtop every 5 weeks. The most recent releases landed on September 30, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 优博讯K31固件升级 | 凌云志fpvtop |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Size | 0 MB | 25 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [UROVO TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1674303082) | [Lijie Hu](https://appshunter.io/developer/1052584645) |

## What reviewers say

### 优博讯K31固件升级

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

**In-app purchases:** none


### 凌云志fpvtop

[App page](https://appshunter.io/ios/app/fpvtop/id6756491311)

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

**In-app purchases:** none


## Frequently asked questions

### 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.

### Is 凌云志fpvtop free?

凌云志fpvtop is free to download, with no in-app purchases.

### Do 优博讯K31固件升级 or 凌云志fpvtop have ads?

Neither 优博讯K31固件升级 nor 凌云志fpvtop shows ads.

### Which is updated more often, 优博讯K31固件升级 or 凌云志fpvtop?

优博讯K31固件升级 ships an update every 4 months, and 凌云志fpvtop every 5 weeks. Most recently, 优博讯K31固件升级 was updated on September 30, 2026 and 凌云志fpvtop on September 20, 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.*