# Zendesk Sell vs Klein Borescope ET21

The clearest difference is rating: Zendesk Sell at 4.6 against Klein Borescope ET21's 2.2. Zendesk Sell also leads on ratings volume (1.6K vs 9). Klein Borescope ET21's advantage is in-app purchases (none vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Zendesk Sell sells 1 one-off in-app purchase. Klein Borescope ET21 asks for nothing beyond the download.

Zendesk Sell holds the better App Store score, 4.6 against 2.2. That said, the two scores are not equally well evidenced: Zendesk Sell has 1.6K ratings behind it against 9, so its average is the more settled of the two.

Zendesk Sell ships an update every 3 months, Klein Borescope ET21 every 2 months. The most recent releases landed on October 21, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Zendesk Sell | Klein Borescope ET21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.6K ratings)](https://appshunter.io/ios/app/zendesk-sell/id488534576/reviews)** | [2.2 (9 ratings)](https://appshunter.io/ios/app/klein-borescope-et21/id6740300461/reviews) |
| Number of ratings | **1.6K** | 9 |
| Positive reviews | 80.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 91 MB | 19 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Future Simple](https://appshunter.io/developer/488534579) | [Klein Tools](https://appshunter.io/developer/440692921) |

## What reviewers say

### Zendesk Sell

[App page](https://appshunter.io/ios/app/zendesk-sell/id488534576)

This sales productivity platform offers a cutting-edge mobile experience for sales teams. It provides essential CRM features alongside mobile-specific tools like communication tracking, email templates with notifications, and geolocation for efficient sales management on the go.

**Highlights:** Communication tracking, Email templates with view notifications, Geolocation for nearby customers, Automatic call logging, Mobile reporting, Offline access, Real-time lead notifications

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Voice Credit | $4.99 | one-time |

**What reviewers like**

- 🚀 Powerful CRM features
- 👍 Intuitive and user-friendly
- 🗓️ Helpful calendar and task management
- 💻 Seamless cross-platform experience
- 🤝 Great for small businesses

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- 🔍 Weak search functionality
- 📧 Email integration issues
- 💰 Pricing concerns after free plan
- 🕰️ Sync delays and data loss

**Reported bugs**

- Leads not syncing properly
- Deals disappearing from the app
- White screen on app launch
- Signature issues in email integration
- Inconsistent call and text logs

**Requested features**

- Customizable sales pipelines
- Advanced reporting and analytics
- Improved mobile app performance
- Better email and calendar integration
- Ability to edit user-defined fields


### 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 Zendesk Sell free?

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

### Is Klein Borescope ET21 free?

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

### Which has better reviews, Zendesk Sell or Klein Borescope ET21?

Zendesk Sell is rated higher. Zendesk Sell averages 4.6 out of 5 from 1.6K ratings, while Klein Borescope ET21 averages 2.2 from 9 ratings.

### Do Zendesk Sell or Klein Borescope ET21 have ads?

Neither Zendesk Sell nor Klein Borescope ET21 shows ads.

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

Zendesk Sell ships an update every 3 months, and Klein Borescope ET21 every 2 months. Most recently, Zendesk Sell was updated on October 21, 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.*