# NICE DIGI vs Optimal°

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.

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.

## The numbers

| Metric | NICE DIGI | Optimal° |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (36 ratings)](https://appshunter.io/ios/app/nice-digi/id1662510208/reviews) | **[4.9 (7 ratings)](https://appshunter.io/ios/app/optimal/id6473653236/reviews)** |
| Number of ratings | **36** | 7 |
| Positive reviews | 22.2% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 194 MB | 19 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [少辉 吴](https://appshunter.io/developer/1662311317) | [Its Optimal LLC](https://appshunter.io/developer/1719356914) |

## What reviewers say

### NICE DIGI

[App page](https://appshunter.io/ios/app/nice-digi/id1662510208)

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.

**Highlights:** Remote lock/unlock, Share access permissions, Initialize and set lock functions, Query unlock and operation logs, Generate timed passcodes

**In-app purchases:** none


### Optimal°

[App page](https://appshunter.io/ios/app/optimal/id6473653236)

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.

**Highlights:** 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

**In-app purchases:** none


## Frequently asked questions

### Is NICE DIGI free?

NICE DIGI is free to download, with no in-app purchases.

### Is Optimal° free?

Optimal° is free to download, with no in-app purchases.

### Which has better reviews, NICE DIGI or Optimal°?

Optimal° is rated higher. NICE DIGI averages 2.7 out of 5 from 36 ratings, while Optimal° averages 4.9 from 7 ratings.

### Do NICE DIGI or Optimal° have ads?

Neither NICE DIGI nor Optimal° shows ads.

### Which is updated more often, NICE DIGI or Optimal°?

NICE DIGI ships an update every 6 months, and Optimal° every 5 months. Most recently, NICE DIGI was updated on September 15, 2026 and Optimal° on June 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*