# Mind Tracker BCI vs SDay

The clearest difference is review sentiment: SDay at 96% against Mind Tracker BCI's 0%. SDay also leads on rating (5.0 vs 1.0) and ratings volume (3 vs 1). Mind Tracker BCI's advantage is in-app purchases (none vs 2) and update cadence (every 2 weeks vs monthly). On price, ads and iOS requirement there is nothing between them.

Both are free to download. SDay sells 2 in-app purchases, starting at $4.99 per month. Mind Tracker BCI asks for nothing beyond the download.

SDay holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 0% of Mind Tracker BCI's written reviews are positive against 96% of SDay's.

Mind Tracker BCI ships an update every 2 weeks, SDay monthly. The most recent releases landed on September 10, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Mind Tracker BCI | SDay |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/mind-tracker-bci/id6738744122/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sday/id6742406337/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 0.0% of reviews | **95.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | **Free** | Freemium |
| Size | 297 MB | 54 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [BRAINBIT INC.](https://appshunter.io/developer/1510548622) | [Kirill Karavaev](https://appshunter.io/developer/1822553564) |

## What reviewers say

### Mind Tracker BCI

[App page](https://appshunter.io/ios/app/mind-tracker-bci/id6738744122)

This app analyzes brain activity waves to provide insights into productivity, stress levels, and emotional states. It helps users understand their brain's workload and develop emotional resilience through biofeedback training.

**Highlights:** Individual Alpha Peak Frequency (iAPF) determination, Real-time brain workload analysis, Identification of psycho-emotional states, Attitude towards tasks tracking, Stress resilience training with biofeedback, Productivity rhythm establishment

**Features:** Vision Pro support

**In-app purchases:** none


### SDay

[App page](https://appshunter.io/ios/app/sday/id6742406337)

Simplify your life and enhance productivity with this straightforward application. It aims to cut through complexity, offering tools to help you achieve more. Designed for ease of use, it focuses on improving daily routines.

**Highlights:** Life improvement tools, Productivity boost, Simplified interface, Focus on daily routines

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SDay Pro Monthly | $4.99 | per month |
| SDay Pro Annual | $49.99 | per year |


## Frequently asked questions

### Is Mind Tracker BCI free?

Mind Tracker BCI is free to download, with no in-app purchases.

### Is SDay free?

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

### Which has better reviews, Mind Tracker BCI or SDay?

SDay is rated higher. Mind Tracker BCI averages 1.0 out of 5 from 1 ratings, while SDay averages 5.0 from 3 ratings.

### Do Mind Tracker BCI or SDay have ads?

Neither Mind Tracker BCI nor SDay shows ads.

### Which is updated more often, Mind Tracker BCI or SDay?

Mind Tracker BCI ships an update every 2 weeks, and SDay monthly. Most recently, Mind Tracker BCI was updated on September 10, 2026 and SDay on September 26, 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.*