# Scentra Aromatic vs Union Protocol

The clearest difference is monetization model: Scentra Aromatic at free against Union Protocol's freemium. Scentra Aromatic also leads on rating (5.0 vs 4.8) and iOS requirement (12.0 vs 15.1). Union Protocol's advantage is ratings volume (6 vs 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.

Scentra Aromatic holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Union Protocol has 6 ratings behind it against 1, so its average is the more settled of the two.

Scentra Aromatic ships an update every 5 weeks, Union Protocol every 6 weeks. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Scentra Aromatic | Union Protocol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/scentra-aromatic/id6753205988/reviews)** | [4.8 (6 ratings)](https://appshunter.io/ios/app/union-protocol-couple-tracker/id6776146648/reviews) |
| Number of ratings | 1 | **6** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 6 weeks |
| Monetization | **Free** | Freemium |
| Size | 10 MB | 121 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Scentra Aromatic LLC](https://appshunter.io/developer/1843055883) | [Accord Studios Ltd.](https://appshunter.io/developer/6776146650) |

## What reviewers say

### Scentra Aromatic

[App page](https://appshunter.io/ios/app/scentra-aromatic/id6753205988)

Effortlessly manage your home or business scent diffusers from your smartphone. Customize schedules, intensity levels, and set automatic activations for specific times, like opening and closing hours. Secure your device with easy password changes.

**Highlights:** Remote diffuser control, Customizable schedules, Adjustable intensity levels, Automatic activation/deactivation, Secure password management

**Features:** macOS Compatibility

**In-app purchases:** none


### Union Protocol

[App page](https://appshunter.io/ios/app/union-protocol-couple-tracker/id6776146648)

Enhance your relationship with shared routines, tasks, and rewards. This app fosters connection and playfulness through daily check-ins, goal setting, and private notes, creating a more intentional rhythm for couples.

**Highlights:** Create shared routines and assign tasks, Track progress and collect points, Unlock custom rewards together, Daily check-ins and partner updates, Private notes and mood tracking, Shared goals and reminders

**In-app purchases:** none


## Frequently asked questions

### Is Scentra Aromatic free?

Scentra Aromatic is free to download, with no in-app purchases.

### Is Union Protocol free?

Union Protocol is free to download, with no in-app purchases.

### Which has better reviews, Scentra Aromatic or Union Protocol?

Scentra Aromatic is rated higher. Scentra Aromatic averages 5.0 out of 5 from 1 ratings, while Union Protocol averages 4.8 from 6 ratings.

### Do Scentra Aromatic or Union Protocol have ads?

Neither Scentra Aromatic nor Union Protocol shows ads.

### Which is updated more often, Scentra Aromatic or Union Protocol?

Scentra Aromatic ships an update every 5 weeks, and Union Protocol every 6 weeks. Most recently, Scentra Aromatic was updated on October 11, 2026 and Union Protocol on October 12, 2026.

---

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