Comparison

GEMS Study vs HTX Swims

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

Head to head

GEMS Study

For GEMS study participants

About

GEMS Study

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GEMS is designed to help people make informed choices about their health. The app is only intended for use by participants in the GEMS study. It is not intended for the general public. App activation and use requires an access code and verification of study participants’ identity. GEMS participants must install and set up the app to complete study enrollment.

About

HTX Swims

Features

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HTX Swims – Swim Lesson Registration Easily find and register for swim lessons with HTX Swims. Browse available classes, choose the right level, and sign up in seconds. View lesson schedules, manage enrollments, and get real-time updates for weather and changes. Designed for busy families, from first-time swimmers to advanced skill development.

Screenshots

GEMS Study3 screens

HTX Swims4 screens

Verdict

The call

The clearest difference is device support: HTX Swims at 3 against GEMS Study's 1. HTX Swims also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases 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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 4 level

GEMS Study versus HTX Swims: the parameters behind the verdict, then further details
Parameter	GEMS Study	HTX Swims
Price	Free	Free
Update frequency	Every 2 months	Every 2 months
Ads	No	No
In-app purchases	No	No
Devices	iPhone	iPhone, iPad, iPod — better
Requires iOS	17.0	15.1 — better
Further details — not scored
Size	152 MB	64 MB
Age rating	17+	4+
Developer	Kaiser Permanente	iClassPro Inc

In-app purchases

None

GEMS Study

No in-app purchases

None

HTX Swims

No in-app purchases

Questions

Is GEMS Study free?

GEMS Study is free to download, with no in-app purchases.

Is HTX Swims free?

HTX Swims is free to download, with no in-app purchases.

Do GEMS Study or HTX Swims have ads?

Neither GEMS Study nor HTX Swims shows ads.

Which is updated more often, GEMS Study or HTX Swims?

GEMS Study ships an update every 2 months, and HTX Swims every 2 months. Most recently, GEMS Study was updated on October 27, 2026 and HTX Swims on October 24, 2026.