TCD Research vs Sollos
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TCD Research
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.
- Cognitive puzzle games
- Dementia research contribution
- Mental health awareness
- Mood logging
- Memory challenges
- Risk factor analysis
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TCD Psych Research is a collection of fun brain games and challenges that allows you to solve cognitive puzzles and help in cutting edge scientific research. The more science challenges you complete the more points you collect and the more you help dementia and mental health research. 50 million people suffer from dementia worldwide, a figure which is set to increase substantially as populations increase. Using gamified cognitive tests the Neureka application aims to allow you the user to contribute and help in the global fight against dementia. The TCD App has the following fun games and challenges to play Risk Factors - Play this fun set of games against the clock and complete questionnaires to help us understand how to prevent dementia! The Science There is a growing body of knowledge that up to 30% of cases of dementia could be prevented through what are called “modifiable risk factors”. We want to understand why this is the case - to unpack the complex relationship that exists between mind, body and environment so we can figure out new ways to fight dementia. In this challenge you will play three fun games that require different types of thinking (cognitive) processes. Prior scientific research has suggested changes in these cognitive processes may predict people’s risk of dementia years before diagnosis. By completing this challenge you will help us understand how potential risk factors might confer risk for developing dementia and in doing so, pave the way towards new and effective interventions that can keep us all healthy for longer! Multi-Mood - Log your moods over 8 weeks and help detect changes in your mood! The Science Major depression affects over 300 million people worldwide at any given moment. Approximately 15% of all people will develop depression at some point in their lives. In MultiMood, you rate your mood twice a day over 8-weeks and complete a depression questionnaire once a week. Research has shown that distinct changes in mood occur before entering a period of depression. Through MultiMood, you’ll be helping us understand how interactions between different aspects of mood contribute to the risk of experiencing a depressive episode. Memory Match - Play this memory matching game where you identify shapes and numbers against the clock ! The Science Research suggests that difficulties linking different forms of memory together (e.g. shapes and colours) is impaired very early on in dementia (potentially 10 years before diagnosis). It is thought that this is because the parts of the brain that link these memories together is one of the earliest to be affected by the disease Star Racer - Collect points against the clock by selecting the numbers and letters as fast as you can ! The Science This game assesses aspects of your mental flexibility (your ability to switch between numbers and letters) and your ability to maintain two trains of thought simultaneously (keeping track of where you are in the number & letter sequences). These abilities are known as ’executive functions’ and prior research has repeatedly shown that they decline 2-3 years prior to dementia diagnosis. Cannon Blast - Shoot the cannon and collect diamonds as you move through levels collecting as many points as you can! The Science Research suggests that the ability to anticipate the consequences of future decisions and make optimal choices based on them (known as model-based planning) is impaired in older adults. It is thought that one reason for age-related decline in this type of decision making is atrophy of an area of the brain called the hippocampus. Dementia results in early and severe hippocampal atrophy and therefore the decision-making abilities tracked by Canon Blast may be sensitive to early signs of dementia. Download TCD Psych Research today, play fun games and challenges and help us fight dementia and mental illness.
Sollos
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Music engineered to help you focus, relax and sleep better. Sollos combines instrumental music from some of the world’s best-known artists with cognitive science and auditory technology designed to support your wellbeing. Listen to specially engineered instrumental playlists from artists including The Weeknd, Post Malone, Selena Gomez, Olivia Dean and Ludovico Einaudi, alongside extended mixes for relaxation, sleep and meditation. There are immersive nature soundscapes too. Everything is organised around three goals: Focus, Relax and Sleep. Sollos is free to download. An active Apple Music subscription or trial is required to unlock the full catalogue. In selected territories, a smaller collection is also available without Apple Music. MORE THAN A PLAYLIST Sollos doesn’t just help you find music. It helps you discover what works for you. Check in with how you’re feeling before and after you listen, compare how you feel across different sessions, and easily return to the audio that works best for you. Explore by goal, see what other Sollos listeners are enjoying, and discover new music for the state of mind you want. MUSIC, RE-ENGINEERED FOR WELLBEING Our cognitive scientists and music experts select and create instrumental music using research into how features such as tempo, harmony, texture and acoustic properties influence attention, relaxation and sleep. We then blend auditory beats into the music to support different listening goals. BACKED BY RESEARCH Sollos is informed by decades of scientific research and our own in-house cognitive science programme. In a published, peer-reviewed study of 308 participants, 30 minutes of Sollos music blended with monaural beats significantly reduced anxiety and improved mood compared with a control group. Our 2025 Listening Impact Study also found: • 91.5% of users reported improved focus after at least 20 mins of listening • 91.9% of users felt more chilled after a single Relax session • Poor sleepers who listened regularly for four weeks reported around an extra hour of sleep per night FOCUS Get into the zone for work, study or anything that needs your full attention. Our Focus music uses gamma auditory beats, which research has linked to improvements in cognitive performance, working memory and creative thinking, alongside carefully selected sonic textures and tempos. “When I start listening to the music I start focusing almost immediately, it's like a wake-up call, and then my mind settles gently into the task.” – a Sollos listener RELAX Switch off, decompress and make space for yourself. Our Relax music uses theta auditory beats for reduced anxiety and improved mood, alongside nature soundscapes designed for calmer listening. “Sollos has been a secret weapon…ready to cure my stress and calm me down” – a Sollos listener SLEEP Wind down at bedtime, drift off or soundtrack a restorative nap. Our Sleep mixes use delta auditory beats and pink noise, which research has linked with better sleep quality and longer, deeper sleep. Some mixes are designed to move gradually from recognisable instrumental music towards near-silence as you wind down. “Sollos became an essential part of my nightly routine” – a Sollos listener MUSIC FOR EVERY KIND OF LISTENER The Sollos catalogue crosses pop, electronic, R&B, hip hop, classical, ambient and more, giving you more ways to find instrumental music that fits both your taste and what you need in the moment. “I'd gone from not sleeping properly, not being able to focus or concentrate, and within 5 minutes of listening to the music it changed everything for me” – Megan, a Sollos listener Discover your soundtrack to a better state of mind. Medical Disclaimer: Sollos is not a medical product and we do not, nor purport to offer, any medical services. For further information, please see the full text of our medical disclaimer: https://find.sollos.app/terms.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TCD Research | Sollos |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (12 ratings) — better | — |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 12 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 81 MB | 146 MB |
| Age rating | 12+ | 17+ |
| Developer | Claire Gillan-Anderson | UNIVERSAL MUSIC GROUP INTERNATIONAL LIMITED |
In-app purchases
TCD Research
No in-app purchases
Sollos
No in-app purchases









