NICE DIGI vs Optimal°
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NICE DIGI
Manage your smart door locks remotely. Unlock or lock your doors, share access with family and visitors, and track activity logs. Generate temporary passcodes for guests.
- Remote lock/unlock
- Share access permissions
- Initialize and set lock functions
- Query unlock and operation logs
- Generate timed passcodes
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NICE DIGI smart locks control system 1. Control your locks: unlock or lock your door with this APP 2. Share access permissions: share permanent or timed access permissions to your familys 3. Set your locks: Initialize and set the various functions of your smart door locks 4. Query records: query unlock records and operation logs of locks in APP 5. Generate timed passcode: generate timed passcode for a temporary visitor or Courier
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 rating: Optimal° at 4.9 against NICE DIGI's 2.7. Optimal° also leads on review sentiment (60% vs 22%). NICE DIGI's advantage is ratings volume (36 vs 7) and iOS requirement (13.0 vs 15.1). 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 2.7. That said, the two scores are not equally well evidenced: NICE DIGI has 36 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 22% of NICE DIGI's written reviews are positive against 60% of Optimal°'s.
NICE DIGI ships an update every 6 months, Optimal° every 5 months. The most recent releases landed on September 15, 2026 and June 1, 2026 respectively.
| Parameter | NICE DIGI | Optimal° |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (36 ratings) | 4.9 (7 ratings) — better |
| Positive reviews | 22.2% of reviews | 60.0% of reviews — better |
| Number of ratings | 36 — better | 7 |
| Update frequency | Every 6 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 194 MB | 19 MB |
| Age rating | 4+ | 17+ |
| Developer | 少辉 吴 | Its Optimal LLC |
Customer experience
NICE DIGI
Optimal°
In-app purchases
NICE DIGI
No in-app purchases
Optimal°
No in-app purchases
