FLEX Study App vs 15
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FLEX Study App
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While using this app you will be asked to complete study related activities and tasks. Activities you may be asked to complete can include completing your dosing diary and performing a Telehealth call with your study doctor.
15
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15-06 eCOA App is intended for use to collect patient reported outcomes relating to a clinical trial. Patients must be given accounts by a participating site in order to log in to the app.
Screenshots
Verdict
FLEX Study App and 15 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
FLEX Study App ships an update every 5 months, 15 every 3 months. The most recent releases landed on May 16, 2026 and May 17, 2026 respectively.
| Parameter | FLEX Study App | 15 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 149 MB | 66 MB |
| Age rating | 17+ | 12+ |
| Developer | Definitive Media Corp. | ERT, INC |
In-app purchases
FLEX Study App
No in-app purchases
15
No in-app purchases
