# e vs Cool Guard

The clearest difference is device support: e at 3 against Cool Guard's 1. 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 2 months. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | e | Cool Guard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/e-sens/id1585074022/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 32 MB | 22 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [e-sens, Inc.](https://appshunter.io/developer/1479061797) | [TouchLync, Inc](https://appshunter.io/developer/1740499417) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-sens/id1585074022)

This tool allows water quality professionals to collect, manage, analyze, and track water quality test parameters. It is designed for water treatment facilities and professionals in the field.

**Highlights:** Water quality data collection, Data management, Analysis of test parameters, Tracking of water quality, Designed for professionals, Supports water treatment facilities

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

**In-app purchases:** none


### Cool Guard

[App page](https://appshunter.io/ios/app/cool-guard-qc-test-app/id6502345075)

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

**In-app purchases:** none


## Frequently asked questions

### Is e free?

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

### Is Cool Guard free?

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

### Do e or Cool Guard have ads?

Neither e nor Cool Guard shows ads.

### Which is updated more often, e or Cool Guard?

e ships an update every 2 months, and Cool Guard every 2 months. Most recently, e was updated on October 23, 2026 and Cool Guard 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.*