K vs e
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K
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With this app you can control your K-Rain BLUE Bluetooth Battery Powered Controller from a smartphone or tablet and is ideal for areas where AC Power is unavailable. App features: • Allows you to manage an unlimited number of controllers • Program, operate and make scheduling changes • Geo-location feature: See every controller, every site, every program • Crew-View™ remote programming allows your team to see all site controller changes/updates • Battery replacement alerts • Add a passcode lock to each controller for added security The BLUE Bluetooth Battery Powered Controller comes in 1, 2 and 4 stations models.
e
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.
- Water quality data collection
- Data management
- Analysis of test parameters
- Tracking of water quality
- Designed for professionals
- Supports water treatment facilities
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The e-sens ROAM app is a free water quality collection tool to gather, manage, analyze and track all your water quality test parameters. Built for Water quality professionals and water treatment facilities.
Screenshots
Verdict
The clearest difference is iOS requirement: K at 11.0 against e's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
K ships an update every 3 months, e every 2 months. The most recent releases landed on September 9, 2026 and September 19, 2026 respectively.
| Parameter | K | e |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 52 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | K-Rain Manufacturing Corporation | e-sens, Inc. |
In-app purchases
K
No in-app purchases
e
No in-app purchases
