Comparison

SMELLiT vs Contestify

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SMELLiT

Participate in scientific research about the human sense of smell. Log daily scents and learn about olfaction. Earn rewards for consistent participation in this research project.

Highlights
  • Log daily scents
  • Learn about olfaction
  • Participate in research
  • Earn rewards
  • Randomized questionnaires
Features
Read full description

SMELLiT is an app behind a collaboration project spanning 4 labs across Europe, the D2Smell project. Funded by the European Research Council, it studies human olfaction where it actually happens - in kitchens, on streets, on buses, in the air you move through all day without thinking about it. Every report you send is something no laboratory could have produced. WHAT YOU DO Four times a day, at random moments, the app asks simple questions: can you smell anything right now? What is it? How long have you been smelling it, and where? Together with the pictures the and the free description of the smell you will provide, this first of its kind database will go a long way helping the olfaction research march forward. The times are random on purpose. The smells you notice when you go looking for them are not the smells that make up our naturalistic daily live. WHAT YOU GET Get paid for taking part in real research. Complete the study and receive a gift voucher by email, with a bonus for finishing all 40 questionnaires. If you would rather your participation simply contribute to the science, you can waive the payment instead. After you finish, an elaborated portfolio of your nose type will be provided: where does YOUR nose fall relative to everyone else? It is not a race, and there are no right answers, so trying to hard will actually hurt your results. Be your true self, and you will find your true nose. :) YOUR DATA The study is approved by the Weizmann Institute of Science Institutional Review Board. You read and accept a full consent statement before anything is collected. You can find more information in out Privacy Policy statement. LANGUAGES SMELLiT is available in 13 languages: Arabic, Danish, English, French, German, Hebrew, Icelandic, Italian, Japanese, Portuguese, Russian, Spanish and Swedish. Arabic and Hebrew read right to left throughout. Join D2Smell, and use your nose to help discover what the nose knows it knows.

About

Contestify

Create, discover, and join online contests with ease. This platform is designed for brands looking to boost engagement and individuals seeking creative challenges. It streamlines the entire contest experience.

Highlights
  • Create online contests
  • Discover new contests
  • Participate in challenges
  • Brand engagement tools
  • Simplified contest management
Features
Read full description

Contestify.io is your go-to platform for creating, discovering, and participating in online contests. Whether you're a brand aiming to engage your audience or a creative individual seeking exciting challenges, Contestify.io simplifies the entire process.

Screenshots

SMELLiT4 screens
Contestify3 screens

Verdict

The call

The clearest difference is rating: Contestify at 5.0 against SMELLiT's 4.5. Contestify also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (13.0 vs 15.0). SMELLiT's advantage is ads (none vs shown) and ratings volume (61 vs 1). On price, 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Contestify holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: SMELLiT has 61 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

SMELLiT ships an update every 2 months, Contestify every 3 weeks. The most recent releases landed on September 24, 2026 and September 14, 2026 respectively.

Scorecard6 real differences · 4 level
SMELLiT versus Contestify: the parameters behind the verdict, then further details
ParameterSMELLiTContestify
PriceFreeFree
Rating4.5 (61 ratings)5.0 (1 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings61 — better1
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size67 MB91 MB
Age rating4+12+
DeveloperWeizmann Institute of ScienceBuilt4Balance

Customer experience

SMELLiT

All ratings61 ratings
Positive85.2%
Neutral3.3%
Negative11.5%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Contestify

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SMELLiT

No in-app purchases

None

Contestify

No in-app purchases

Questions

Is SMELLiT free?
SMELLiT is free to download, with no in-app purchases.
Is Contestify free?
Contestify is free to download, with no in-app purchases.
Which has better reviews, SMELLiT or Contestify?
Contestify is rated higher. SMELLiT averages 4.5 out of 5 from 61 ratings, while Contestify averages 5.0 from 1 ratings.
Do SMELLiT or Contestify have ads?
Contestify shows ads; SMELLiT does not.
Which is updated more often, SMELLiT or Contestify?
SMELLiT ships an update every 2 months, and Contestify every 3 weeks. Most recently, SMELLiT was updated on September 24, 2026 and Contestify on September 14, 2026.

Other comparisons