SMELLiTA free research app from the d2smell project
What do you smell right now?
Four times a day, at random moments, SMELLiT asks what you are smelling. Answer 40 short questionnaires over about 10 days, help map the human sense of smell, and earn up to €17.
On a computer? Scan this code to open the page on your phone, where the store buttons are one tap away.
How it works
Four times a day, at random times within your waking hours, a notification says “Time to smell!”. You have 15 minutes to open it. The times are random on purpose: the smells you notice when you go looking for them are not the smells that make up daily life.
Smelling something?
Yes or no: smelling nothing is a valid answer too.
Rate it
How pleasant, how intense, natural or artificial.
Name it
Pick words from a word bank, then add your own.
Snap a photo
Of where the smell comes from. No people, please.
Done
That’s one. Answer 40 and the study is complete.
What you get
| Each questionnaire | €0.25 |
| Completing all 40 | +€5 bonus |
| Optional demographic survey | +€2 |
| Total | Up to €17 |
| Minimum payment | €1 (four questionnaires) |
| Paid as | A GoGift “Global Gift Card” by email, issued in EUR. No fee to redeem it in EUR, USD, GBP, CHF, DKK, SEK, NOK, CAD or AUD; 3% for other currencies. Or donate your payment to science. |
| When | Up to 10 days after you request it |
| Stopping early | You keep €0.25 per questionnaire answered, without the €5 bonus |
Who can take part
- 18 or older (19 in South Korea)
- A normal sense of smell
- One smartphone for the whole study: Android 7.0 or later with a camera, or an iPhone with iOS 15 or later
- An internet connection, and permission for notifications, location (while the app is in use) and the camera
- Recruitment is open in selected countries. The app tells you if yours is not one of them.
Your privacy
- Your answers are filed under a random study code, kept apart from your phone number.
- Each questionnaire records a place name, never GPS coordinates. The app never reads your location in the background.
- No ads, no analytics tools, and we never sell your data.
In your language
SMELLiT speaks 13 languages: Arabic, Danish, English, French, German, Hebrew, Icelandic, Italian, Japanese, Portuguese, Russian, Spanish and Swedish. Arabic and Hebrew read right to left.
The science
Olfaction is the least charted of the human senses. SMELLiT records what people actually smell in everyday life, at home, on the street, on the bus: data that no laboratory can produce.
SMELLiT is part of d2smell, an ERC Synergy project of the Weizmann Institute of Science with KTH Royal Institute of Technology, the Max Planck Society and Karolinska Institutet. The study is approved by the Weizmann Institute of Science Institutional Review Board (IRB).
d2smell has received funding from the European Research Council (ERC) under the European Union’s Horizon Europe research and innovation programme (grant agreement No. 101118977).
Questions?
Read our Support page, or email smellita@weizmann.ac.il.