# TCD Research vs Sollos

The clearest difference is update cadence: Sollos at every 2 weeks against TCD Research's every 2 months. TCD Research's advantage is iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TCD Research ships an update every 2 months, Sollos every 2 weeks. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | TCD Research | Sollos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (12 ratings)](https://appshunter.io/ios/app/tcd-research/id1510744878/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 81 MB | 146 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Claire Gillan-Anderson](https://appshunter.io/developer/1510705636) | [UNIVERSAL MUSIC GROUP INTERNATIONAL LIMITED](https://appshunter.io/developer/1663287829) |

## What reviewers say

### TCD Research

[App page](https://appshunter.io/ios/app/tcd-research/id1510744878)

Engage in brain games and cognitive challenges to contribute to scientific research on dementia and mental health. Your participation helps researchers understand risk factors and develop new interventions.

**Highlights:** Cognitive puzzle games, Dementia research contribution, Mental health awareness, Mood logging, Memory challenges, Risk factor analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### Sollos

[App page](https://appshunter.io/ios/app/sollos/id1663365520)

**In-app purchases:** none


## Frequently asked questions

### Is TCD Research free?

TCD Research is free to download, with no in-app purchases.

### Is Sollos free?

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

### Do TCD Research or Sollos have ads?

Neither TCD Research nor Sollos shows ads.

### Which is updated more often, TCD Research or Sollos?

TCD Research ships an update every 2 months, and Sollos every 2 weeks. Most recently, TCD Research was updated on October 24, 2026 and Sollos on October 17, 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.*