# Pocket Smile > Participate in a scientific study on the contagious nature of smiles. (iPhone/iPad app by UCL.) - Source: https://appshunter.io/ios/app/pocket-smile/id709226955 (this page in markdown: same URL + `.md`) - Developer: [UCL](https://appshunter.io/developer/611203777) - Category: Health & Fitness, Medical - Price: Free - Age rating: 17+ - Requires: iOS 8.0 · 28 MB - Languages: American English - Released: 2013-09-25 - Data updated: 2026-08-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/pocket-smile/id709226955/reviews.md ## What is Pocket Smile? Have you ever noticed how many smiles are started by other smiles? Just like laughing, smiling is contagious. Participate in ground-breaking science to see if looking at smiling faces throughout the day can increase happiness! HOW IT WORKS: Day 1: Pocket Smile shows you images of smiling faces or landscapes for 10 days Day 10: Any changes in mood are tracked and the type of image you see switches for the next 10 days Day 20: You have completed the experiment! You can now choose what image type to see and the data is anonymously sent to UCL. FIND OUT MORE: Visit www.pocketsmile.icn.ucl.ac.uk for more information on this experiment supported by University College London, including news and updates! ## Key features - View smiling faces and landscapes - Track mood changes - Participate in scientific research - Anonymous data submission - Learn about smile contagion ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/pocket-smile/id709226955/reviews.md ### 5/5 — Just try it! *2013-09-27* I heard PocketSmile made it second to the reddit/psychology section yesterday. But for sure it made it first to my heart! ### 5/5 — Great cause *2013-09-26* A great little app with big plans ahead. I suggest everyone download this and participate to help further research and understand how our brains work! ### 5/5 — Amazing! *2013-09-26* For science! ## Frequently asked questions about Pocket Smile ### What is Pocket Smile? Pocket Smile is a free app that allows you to participate in a scientific experiment conducted by University College London. It studies how viewing smiling faces can impact your mood and happiness over a 20-day period. ### How does Pocket Smile work? For the first 10 days, Pocket Smile shows you images of smiling faces or landscapes. On day 10, it tracks any mood changes and adjusts the image type for the next 10 days. After 20 days, your anonymous data is sent to UCL. ### Is Pocket Smile free to use? Yes, Pocket Smile is completely free to download and use. There are no in-app purchases or subscription fees required to participate in the experiment. ### What devices does Pocket Smile support? Pocket Smile is available for iPhone and iPod devices. It was last updated on January 30, 2017, with version 1.7.5. ### What is the age rating for Pocket Smile? Pocket Smile has an age rating of 17+. This is likely due to the nature of scientific data collection and the potential for users to interpret mood changes. ### Does Pocket Smile have ads? No, Pocket Smile does not contain advertisements. As a free app developed by University College London for research purposes, it is ad-free. ### Where can I find more information about the Pocket Smile experiment? You can find more details about the Pocket Smile experiment, including news and updates, by visiting the official website at www.pocketsmile.icn.ucl.ac.uk. ### How often is Pocket Smile updated? Pocket Smile was last updated on January 30, 2017. While it is a free research app, users may wish to check the app store for any potential future updates. ## Version history (last 5 releases) ### 1.7.5 — 2017-01-30 This app has been updated by Apple to display the Apple Watch app icon. Small fixes ### 1.7.4 — 2016-12-08 Small improvements ### 1.7.3 — 2016-11-01 Small improvements ### 1.7.2 — 2016-10-25 All new experiment and images comparing the effect of seeing smiling faces and landscapes! ### 1.7.1 — 2016-10-19 All new experiment and images comparing the effect of seeing smiling faces and landscapes! ## Apps similar to Pocket Smile | App | Rating | Price | Category | | --- | --- | --- | --- | | [Ubunye: Spiritual Awakening](https://appshunter.io/ios/app/ubunye-spiritual-awakening/id1622169324) | — | Free | Health & Fitness | | [Egao](https://appshunter.io/ios/app/egao/id1579227369) | 5.0 (2) | Free | Health & Fitness | | [Menopause Meditations](https://appshunter.io/ios/app/menopause-meditations/id6686398531) | 5.0 (3) | Free | Health & Fitness | | [Healing Frequency Dr. Rife AI](https://appshunter.io/ios/app/healing-frequency-dr-rife-ai/id6478753396) | 4.6 (14) | Free | Health & Fitness | | [MoodUp: Daily Compliments](https://appshunter.io/ios/app/moodup-daily-compliments/id6448336860) | 5.0 (4) | Free | Health & Fitness | | [RoseApp - Cancer et entourage](https://appshunter.io/ios/app/roseapp-cancer-et-entourage/id6599854316) | — | Free | Health & Fitness | ## More apps by UCL - [UCL Go](https://appshunter.io/ios/app/ucl-go/id357476297) - [The Happiness Project](https://appshunter.io/ios/app/the-happiness-project/id1366965114) - [UCL Assistant](https://appshunter.io/ios/app/ucl-assistant/id1462767418) - [UCLMS Exams](https://appshunter.io/ios/app/uclms-exams/id1483452980) - [My Activity Journal](https://appshunter.io/ios/app/my-activity-journal/id1531458046) All apps by UCL: https://appshunter.io/developer/611203777 ## Related topics [smile todo](https://appshunter.io/ios/topics/smile-todo) · [ismileface](https://appshunter.io/ios/topics/ismileface) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*