ZeroControl vs Sutro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZeroControl
Control your bed or sofa with your mobile device. This app offers the same functionality as dedicated HJH handsets for dual or single actuator applications.
- Mobile device control
- Dual actuator support
- Single actuator support
- Replicates handset functions
- For bed and sofa applications
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ZeroControl app is a device using mobile phone control dual actuator or single actuator for bed or sofa application. The APP control function identical to HJH13D handset or HJH55 handset or HJH68 handset. This app is same to our other app.
Sutro
Effortlessly manage your pool or spa water quality. This app works with a smart monitor to automatically track pH, free chlorine, alkalinity, and temperature, providing insights that make sense for optimal water conditions.
- Automatic water quality monitoring
- pH tracking
- Free chlorine measurement
- Alkalinity tracking
- Temperature monitoring
- Seamless app integration
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Sutro is the simple, safe, and seamless way to manage your Pool (or Spa) water with measurements that make sense and monitoring that is automatic. The Sutro app works with the Sutro Smart Monitor to measure your pool or spa’s pH, free chlorine (ppm), alkalinity, and temperature without you having to do anything.
Screenshots
Verdict
The clearest difference is rating: ZeroControl at 4.5 against Sutro's 3.9. Sutro's advantage is ratings volume (175 vs 8) and update cadence (every 2 months vs every 4 months). On price, review sentiment, 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.
ZeroControl holds the better App Store score, 4.5 against 3.9. That said, the two scores are not equally well evidenced: Sutro has 175 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 75% of ZeroControl's written reviews are positive against 73% of Sutro's.
ZeroControl ships an update every 4 months, Sutro every 2 months. The most recent releases landed on June 4, 2026 and June 10, 2026 respectively.
| Parameter | ZeroControl | Sutro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (8 ratings) — better | 3.9 (175 ratings) |
| Positive reviews | 75.0% of reviews — better | 72.9% of reviews |
| Number of ratings | 8 | 175 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 12.4 |
| Further details — not scored | ||
| Size | 114 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Qingdao Richmat Intelligence Technology Inc. | Sutro Connect Inc |
Customer experience
ZeroControl
Sutro
Bugs and requests
ZeroControl
Not enough reviews yet to summarise bugs or requests.
Sutro
Reported bugs
4 issues- App crashes and freezes
- Disconnection issues with hub
- Calibration failures
- Inaccurate water chemistry readings
Requested features
4 requests- Measure total hardness and CYA
- Customizable notification settings
- Ability to cancel subscription easily
- Improved app stability and user experience
In-app purchases
ZeroControl
No in-app purchases
Sutro
No in-app purchases
