# ReViiV vs NBack

The clearest difference is rating: NBack at 5.0 against ReViiV's 4.5. NBack also leads on review sentiment (100% vs 75%). ReViiV's advantage is update cadence (monthly vs every 2 months) and ratings volume (8 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. ReViiV sells 2 in-app purchases, starting at $0.99 per month and NBack sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

NBack holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: ReViiV has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of ReViiV's written reviews are positive against 100% of NBack's.

ReViiV ships an update monthly, NBack every 2 months. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ReViiV | NBack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/reviiv/id1557588292/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nback-boost-iq/id6743346501/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 25 MB | 44 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Martysoft LLC](https://appshunter.io/developer/1493293014) | [eric cesar](https://appshunter.io/developer/1783301800) |

## What reviewers say

### ReViiV

[App page](https://appshunter.io/ios/app/reviiv/id1557588292)

This app offers customized daily breathing exercises designed to alleviate post-viral symptoms like fatigue, brain fog, and loss of taste/smell. It utilizes scientifically backed techniques across 16 progressive stages to promote steady improvement and symptom relief.

**Highlights:** Customized daily breathing exercises, 16 progressive stages for improvement, Relief from fatigue, brain fog, taste/smell loss, 8 scientifically backed techniques, Weekly progress assessments and graphs, Detailed guides and technique resources

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Long Haul Breathing Therapy | $0.99 | per month |
| Long Haul Breathing Therapy | $6.99 | per year |


### NBack

[App page](https://appshunter.io/ios/app/nback-boost-iq/id6743346501)

This scientifically validated cognitive training app is designed to enhance focus, memory, and problem-solving skills. It utilizes the dual n-back method, proven to increase fluid intelligence, offering a challenging yet rewarding experience for those seeking mental improvement.

**Highlights:** Scientifically validated cognitive training, Dual n-back method for fluid intelligence, Boosts memory and focus, Enhances problem-solving skills, Progress tracking with data-backed gains, Customizable user experience

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly membership | $1.99 | per month |
| Yearly membership | $14.99 | per year |


## Frequently asked questions

### Is ReViiV free?

ReViiV is free to download, with in-app purchases available.

### Is NBack free?

NBack is free to download, with in-app purchases available.

### Which has better reviews, ReViiV or NBack?

NBack is rated higher. ReViiV averages 4.5 out of 5 from 8 ratings, while NBack averages 5.0 from 1 ratings.

### Do ReViiV or NBack have ads?

Neither ReViiV nor NBack shows ads.

### Which is updated more often, ReViiV or NBack?

ReViiV ships an update monthly, and NBack every 2 months. Most recently, ReViiV was updated on October 24, 2026 and NBack on October 11, 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.*