Evidation vs Co
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Evidation
Earn rewards for healthy actions like walking and exercising. Contribute to medical research by securely sharing your health data. Track your progress and sync with popular fitness apps and wearables.
- Earn rewards for health actions
- Participate in health research
- Track and sync health data
- Personalized health insights
- Health dashboard
- Answer health surveys
Read full descriptionHide full description
Understand your health. Stay connected. Take part in RESEARCH. Evidation helps you learn more about your health data. Connect your health apps and wearables to see trends in activity, sleep, heart health, and more. Get INSIGHTS that help you better understand your everyday health. Stay motivated with Circles by inviting friends and family and comparing steps on a shared leaderboard. You can also join research studies that help advance health and medical research. Depending on the study, you may answer surveys, share health data, or complete other activities. Eligible studies may offer cash or other rewards for participating. With Evidation, you can: Understand your health: See trends and insights from your health data. Connect with Circles: Invite friends or family to your Circle and see how your steps compare on a shared leaderboard. Join research studies: Contribute to research that can help improve health and healthcare. Connect your devices: Sync supported apps and wearables like Apple Health, Fitbit, Samsung Health, Google Fit, and Oura. Earn rewards: Get rewarded for eligible studies and select activities. Your data, your choice You stay in control of your information. Your health data is shared only with your consent or at your request. Join millions of Evidation members learning from their health data, staying motivated together, and helping move research forward. Learn from your data. Connect with others. Contribute to research.
Co
Participate in weekly surveys, polls, and forum discussions to share your opinions and experiences. Earn points for your engagement, redeemable for gift cards. All data is used for research purposes.
- Weekly exercises
- Topics and forums
- Online surveys
- Quick polls
- Earn points
- Redeem for gift cards
Read full descriptionHide full description
"Welcome to Co-Deo! We are looking forward to engage with you and to hear your thoughts, opinions and experiences. The focus is deodorants but we are also interested in broader more general ideas too. You will have opportunities to participate in new exercises every week including topics/forums, online surveys and quick polls. This app will allow you to access the community on your mobile phone or tablet. You will earn points as a result of your participation in these activities, which can be redeemed for various gift cards. All the data collected will be used for research purposes. We look forward to your participation via our mobile application! "
Screenshots
Verdict
The clearest difference is review sentiment: Evidation at 50% against Co's 0%. Evidation also leads on rating (4.6 vs 3.3) and update cadence (every 3 days vs every 2 months). Co's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.4). On price, ads, in-app purchases and monetization model 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.
Evidation holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: Evidation has 29K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of Evidation's written reviews are positive against 0% of Co's.
Evidation ships an update every 3 days, Co every 2 months. The most recent releases landed on September 29, 2026 and September 19, 2026 respectively.
| Parameter | Evidation | Co |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (29K ratings) — better | 3.3 (4 ratings) |
| Positive reviews | 50.1% of reviews — better | 0.0% of reviews |
| Number of ratings | 29K — better | 4 |
| Update frequency | Every 3 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 12.0 — better |
| Further details — not scored | ||
| Size | 74 MB | 57 MB |
| Age rating | 17+ | 4+ |
| Developer | Evidation Health, Inc. | QuestionPro.com |
Customer experience
Evidation
Co
Bugs and requests
Evidation
Reported bugs
3 issues- Missing activity data
- Inconsistent point calculations
- Login and sign-out issues
Requested features
4 requests- More frequent reward payouts
- Improved app syncing and data accuracy
- Expanded survey and study opportunities
- Customizable point tracking and goals
Co
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Evidation
No in-app purchases
Co
No in-app purchases
