ECHO Water vs The90 Gem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ECHO Water
This app provides a streamlined and dependable interface for operating your Echo Flask. It offers a simplified user experience for managing hydrogen water generation.
- Simplified operation
- Reliable performance
- Echo Flask management
- Hydrogen water generation
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We rebuilt the ECHO Water app from the ground up to deliver a simpler, more reliable way to use your Echo Flask.
The90 Gem
This jewelry-inspired sensor tracks your skin's real-time UV exposure. It helps you protect against aging and harness the sun's health benefits.
- Real-time UV tracking
- Skin exposure monitoring
- Aging protection
- Sun health benefits
- Jewelry-inspired design
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The jewelry-inspired UV sensor that tracks what your skin actually experiences, so you can protect how you age while harnessing the health benefits of the sun.
Screenshots
Verdict
The clearest difference is review sentiment: The90 Gem at 80% against ECHO Water's 20%. The90 Gem also leads on rating (4.3 vs 2.7). ECHO Water's advantage is ratings volume (52 vs 7). 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.
The90 Gem holds the better App Store score, 4.3 against 2.7. That said, the two scores are not equally well evidenced: ECHO Water has 52 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 20% of ECHO Water's written reviews are positive against 80% of The90 Gem's.
ECHO Water ships an update every 3 weeks, The90 Gem every 2 weeks. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.
| Parameter | ECHO Water | The90 Gem |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (52 ratings) | 4.3 (7 ratings) — better |
| Positive reviews | 20.3% of reviews | 80.0% of reviews — better |
| Number of ratings | 52 — better | 7 |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 96 MB |
| Age rating | 4+ | 4+ |
| Developer | Echo Water | The90, Inc. |
Customer experience
ECHO Water
The90 Gem
Bugs and requests
ECHO Water
Reported bugs
3 issues- App unable to sync with water bottle
- Inconsistent flask counting
- Bluetooth pairing problems
Requested features
3 requests- Ability to manually log water intake
- Scheduling options for hydrogen water
- Improved app performance and stability
The90 Gem
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ECHO Water
No in-app purchases
The90 Gem
No in-app purchases
