# FMHero vs Klein Borescope ET21

The clearest difference is rating: FMHero at 4.7 against Klein Borescope ET21's 2.2. FMHero also leads on update cadence (every 2 weeks vs every 2 months). Klein Borescope ET21's advantage is iOS requirement (12.0 vs 15.1). On price, ratings volume, 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.

FMHero holds the better App Store score, 4.7 against 2.2. Both are backed by a comparable volume of ratings — 14 and 9 respectively.

FMHero ships an update every 2 weeks, Klein Borescope ET21 every 2 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | FMHero | Klein Borescope ET21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (14 ratings)](https://appshunter.io/ios/app/fmhero/id1570918942/reviews)** | [2.2 (9 ratings)](https://appshunter.io/ios/app/klein-borescope-et21/id6740300461/reviews) |
| Number of ratings | **14** | 9 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 81 MB | 19 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FMHERO, LLC](https://appshunter.io/developer/1570918944) | [Klein Tools](https://appshunter.io/developer/440692921) |

## What reviewers say

### FMHero

[App page](https://appshunter.io/ios/app/fmhero/id1570918942)

This app streamlines HVAC/R documentation, cutting paperwork time in half. It allows for quick unit scanning, precise refrigerant tracking, and ensures compliance with EPA regulations. Service records are stored permanently, moving with the user's career.

**Highlights:** Slash documentation time, Scan unit nameplates, Refrigerant and cylinder tracking, Permanent service records, Audit-ready compliance reports, EPA Section 608 compliance

**Features:** Vision Pro support

**In-app purchases:** none


### Klein Borescope ET21

[App page](https://appshunter.io/ios/app/klein-borescope-et21/id6740300461)

This app allows construction workers to capture pictures and videos of worksite progress and details using a WiFi borescope. It facilitates easy documentation of on-site conditions and project advancements.

**Highlights:** Picture capture, Video recording, WiFi connectivity, Worksite documentation, Progress tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FMHero free?

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

### Is Klein Borescope ET21 free?

Klein Borescope ET21 is free to download, with no in-app purchases.

### Which has better reviews, FMHero or Klein Borescope ET21?

FMHero is rated higher. FMHero averages 4.7 out of 5 from 14 ratings, while Klein Borescope ET21 averages 2.2 from 9 ratings.

### Do FMHero or Klein Borescope ET21 have ads?

Neither FMHero nor Klein Borescope ET21 shows ads.

### Which is updated more often, FMHero or Klein Borescope ET21?

FMHero ships an update every 2 weeks, and Klein Borescope ET21 every 2 months. Most recently, FMHero was updated on October 24, 2026 and Klein Borescope ET21 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.*