Della+ vs Optimal°
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Della+
Control smart home appliances remotely for optimal comfort and energy efficiency. Adjust settings, automate temperature based on location, and integrate with voice assistants for a seamless living experience.
- Remote appliance control
- Smart feature integration
- Energy efficiency
- Voice assistant compatibility (Alexa, Google Assistant)
- WiFi connectivity
- GeoFence temperature adjustment
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DELLA believes your home should always feel just right. Our appliances combine smart features, energy efficiency, and sleek designs to create a sustainable living environment. Compatible with Alexa and Google Assistant, the DELLA+ app offers complete control via your smartphone, with seamless WiFi and GeoFence functionality that adjusts temperature as you return home. With DELLA, you can dial in perfect comfort from anywhere and have your best home.
Optimal°
This app provides remote control and monitoring for a specific brand of tankless water heaters. Users can adjust temperature, track performance metrics, and receive diagnostic information for efficient hot water management.
- Set water heater output temperature
- Monitor unit activity state
- Track flow rate and energy consumption
- View inlet and outlet water temperatures
- Access diagnostics and error codes
- Enable Vacation Mode
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Control and Monitor your Optimal Opti Tankless Water Heater with the Optimal° connected app. Optimal° app allows you to control temperature, monitor performance and unit diagnostics, giving you full control of our hot water services. Optimal's patent pending ultrasonic flow sensors allow you to add your water heater to your smart home intelligence. Optimal° allows you to precisely customize how hot water is delivered to your faucets. Save money, be efficient and that's Optimal. Current App Version functionality. - Set water heater output temperature - Unit activity state (heating / not heating) - Gallons / min flow rate - Kilowatts per hour rate - Inlet Water Temperature - Outlet Water Temperature - Input Voltage - Available Flow Rate - Heater Capacity - Vacation Mode - Diagnostics / Error Code Reporting
Screenshots
Verdict
The clearest difference is review sentiment: Optimal° at 60% against Della+'s 9%. Optimal° also leads on rating (4.9 vs 3.6). Della+'s advantage is ratings volume (423 vs 7) and device support (4 vs 2). 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.
Optimal° holds the better App Store score, 4.9 against 3.6. That said, the two scores are not equally well evidenced: Della+ has 423 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 9% of Della+'s written reviews are positive against 60% of Optimal°'s.
Della+ ships an update every 3 months, Optimal° every 5 months. The most recent releases landed on October 11, 2026 and September 29, 2026 respectively.
| Parameter | Della+ | Optimal° |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (423 ratings) | 4.9 (7 ratings) — better |
| Positive reviews | 8.8% of reviews | 60.0% of reviews — better |
| Number of ratings | 423 — better | 7 |
| Update frequency | Every 3 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 241 MB | 19 MB |
| Age rating | 12+ | 17+ |
| Developer | Align Inc. (CA) | Its Optimal LLC |
Customer experience
Della+
Optimal°
Bugs and requests
Della+
Reported bugs
4 issues- App freezes or becomes unresponsive
- Fails to connect to devices
- Loses saved settings and configurations
- Displays incorrect or inconsistent information
Requested features
6 requests- Add ability to increase temperature
- Restore removed features
- Improve app stability and reliability
- Enhance user interface and controls
- Add support for more device models
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- Provide better customer support
Optimal°
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Della+
No in-app purchases
Optimal°
No in-app purchases
