# SolidGuide vs e

The clearest difference is monetization model: SolidGuide at free against e's ad-supported. On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for SolidGuide against 5.0 for e. Both are backed by a comparable volume of ratings — 3 and 3 respectively.

SolidGuide ships an update every 6 weeks, e every 2 months. The most recent releases landed on June 5, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | SolidGuide | e |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/solidguide/id1522550825/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/e-sens/id1585074022/reviews) |
| Number of ratings | 3 | 3 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 3 MB | 32 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [APTech Group](https://appshunter.io/developer/1009293142) | [e-sens, Inc.](https://appshunter.io/developer/1479061797) |

## What reviewers say

### SolidGuide

[App page](https://appshunter.io/ios/app/solidguide/id1522550825)

This app provides water treatment professionals with quick access to product information and essential calculators for cooling tower, boiler, and closed-loop systems. It features a user-friendly catalog, equipment details, intelligent surveys, and searchable resources like spec sheets and drawings.

**Highlights:** User-friendly product catalog, Comprehensive equipment information, Intelligent surveys, Upgraded calculators, Searchable resources (spec sheets, drawings, case studies)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is SolidGuide free?

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

### Is e free?

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

### Which has better reviews, SolidGuide or e?

SolidGuide and e are both rated 5.0 out of 5 on the App Store, from 3 and 3 ratings respectively.

### Do SolidGuide or e have ads?

Neither SolidGuide nor e shows ads.

### Which is updated more often, SolidGuide or e?

SolidGuide ships an update every 6 weeks, and e every 2 months. Most recently, SolidGuide was updated on June 5, 2026 and e on September 19, 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.*