Comparison

The Happiness Project vs SoilPlastic

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

Head to head
About

The Happiness Project

Engage in short, enjoyable mini-games designed by scientists to contribute to real psychological and neuroscience research. Your gameplay and anonymous survey responses help study well-being, anxiety, and depression.

Highlights
  • Play mini-games for science
  • Contribute to psychology research
  • Study neuroscience of well-being
  • Anonymous surveys
  • Understand mental health
  • Citizen science project
Features
Read full description

Play fun mini-games to help brain scientists study the psychology and neuroscience of well-being! Created by scientists at UCL and Yale, this app is a citizen science project taking psychology and neuroscience experiments from the lab to your smartphone. Every 3-minute game that you finish contributes data to real scientific research about how the brain works. The anonymous surveys help us see what causes well-being and understand mental health conditions like anxiety and depression. Be part of a unique citizen science experiment and help us write the equation for happiness! Dr Robb Rutledge (Yale Psychology) says: "We all want to know what determines happiness. It’s hard to figure it out! In our games, we ask people about their happiness as they make decisions in different situations. We hope people enjoy our app and help us answer some really important scientific questions!" This citizen science project was supported by the UK Medical Research Council.

About

SoilPlastic

Features
Read full description

Plastic use has facilitated many practices in agriculture in the past decades. However, the increased application leads to aggregations of plastic in the fields in various contents. From the different plastic debris micro-, and nano-plastics (MNP) are derived and are small enough to be ingested by a wide range of organisms and can cross biological barriers at nano-scale and enter plant systems. This emerging risk has prompted first studies that confirmed the high potential of accumulation of MP in soils causing changes in physico-chemical soil properties. Consequently, this can cause alternation of soil functions such as soil water dynamics and ultimately affect related ecosystem services (ESS) like nutrient cycling, plant growth, and soil biodiversity, which have unmeasured impacts on the economy of the farm. These effects could be even magnified with the presence of MP in combination of other soil pollutants, such as pesticides and veterinary drugs or plastic additives (e.g. dyes), potentially exhibiting synergistic effects. Within the EU research project ‘Minagris’ these interactive mechanisms are explored and documented. This App /’SoilPlastic’ motivates and engages various stakeholders to contribute to this process by observing and documenting plastic residues/littering in and on soils, submitting anonymized content to a global database. The aim is to identify needs, improve farmer and citizen awareness, provide practitioners with scientifically sound guidance on the impact of different plastic uses and inputs on soil ecosystems – enabling them to make informed decisions – and joint development of novel strategies for reducing plastic contamination. Additionally, with the observed data, a better understanding of any potentially harmful impacts of plastic debris to soil functions, soil biodiversity, related ESS, agricultural productivity at the field level, and related socio-economic consequences at farm level is provided. The App is running on the SPOTTERON Citizen Science Platform at www.spotteron.net

Screenshots

The Happiness Project4 screens
SoilPlastic4 screens

Verdict

The call

The Happiness Project and SoilPlastic are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

UpkeepUpdate frequency

The Happiness Project ships an update every 5 months, SoilPlastic every 3 months. The most recent releases landed on November 2, 2026 and October 4, 2026 respectively.

ScorecardNo meaningful differences
The Happiness Project versus SoilPlastic: the parameters behind the verdict, then further details
ParameterThe Happiness ProjectSoilPlastic
PriceFreeFree
Rating3.9 (42 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings42 — better—
Update frequencyEvery 5 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size99 MB122 MB
Age rating12+4+
DeveloperUCLSPOTTERON Gmbh

In-app purchases

None

The Happiness Project

No in-app purchases

None

SoilPlastic

No in-app purchases

Questions

Is The Happiness Project free?
The Happiness Project is free to download, with no in-app purchases.
Is SoilPlastic free?
SoilPlastic is free to download, with no in-app purchases.
Do The Happiness Project or SoilPlastic have ads?
Neither The Happiness Project nor SoilPlastic shows ads.
Which is updated more often, The Happiness Project or SoilPlastic?
The Happiness Project ships an update every 5 months, and SoilPlastic every 3 months. Most recently, The Happiness Project was updated on November 2, 2026 and SoilPlastic on October 4, 2026.

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