Comparison

Castor Connect vs Ctrl

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

Head to head
About

Castor Connect

This app allows study participants to securely complete electronic patient-reported outcome (ePRO) questionnaires on their mobile devices. It offers offline data storage and manual syncing for flexibility. Access requires an invitation or activation code.

Highlights
  • ePRO questionnaire completion
  • Offline data storage
  • Manual data sync
  • Secure participant data
  • Native mobile application
Read full description

Castor Connect enables study participants to complete Castor Surveys (ePRO questionnaires) via a native mobile application. - Compliant, secure, user-friendly ePRO solution - Configured using our EDC product to be as simple or complex as your study demands - Flexible and secure, offline data storage with manual sync and native security mean participants can submit their study data whenever they need An invitation to take part or the scanning of a participant-specific activation code is required to use this application. You can find more information about Castor surveys or Castor Connect at castoredc.com/epro

About

Ctrl

Features
Read full description

Replace screen time with real life. The psychology of why you scroll. The science of what to do instead. When your phone pulls you in, Ctrl offers something better. Ctrl is for people who want their time back. You set your own goals for phone use and pick the activities you'd rather be doing. When you drift past a goal, Ctrl steps in with one of those activities, without ever needing to open the app. DESIGNED BY A PSYCHOLOGIST Ctrl was co-founded by Scott Kollins, PhD, a clinical psychologist who has spent more than 20 years studying attention, habits and addiction. As a professor at Duke University, he led the clinical research behind the first video game treatment authorized by the FDA. That research points to something simple: locking yourself out of apps rarely sticks, but people can change their own habits when they get the right help at the right moment. Ctrl is built to be that help. HOW IT WORKS โ€ข Set your goals. Limit all phone use, specific apps, or chosen apps during part of your day, such as evenings or the first hour after you wake. โ€ข Pick your "Replace". Choose from six categories: Move, Outdoors, Creative, Social, Calm and Focus. Pick as broadly as "anything outdoors" or as narrowly as a single run, creative writing, or a simple focus block. โ€ข Get an offer at the right moment. When Ctrl detects usage of screen time flagged by you, Ctrl offers three of your picks. For each goal, choose a gentle Nudge notification or a Shield that covers the app. โ€ข Do it. Every Replace Activity runs on a timer on your Lock Screen. YOUR CTRL SCORE One daily number from 0 to 100 that shows whether you kept the goals you set. It measures you against your own goals, not anyone else's idea of healthy. Tougher goals are worth more, and every Replace you complete adds to your score. THERE WHEN YOU NEED IT Ctrl works entirely outside the app: Lock Screen and Home Screen widgets, Live Activities, shields and notifications. Open the app to see your history, adjust your picks, or do the Sunday check-in, a short weekly review to tune your goals for the week ahead. CIRCLE (OPTIONAL) Invite a few friends to cheer each other on and take on challenges together. Invites go from your own Messages app, and Ctrl never contacts anyone for you. Circle is entirely optional, and everything else works without it. GROUNDED IN RESEARCH Goals and activities come with a short note on their benefits and the published study behind it. Where no study exists, we say so. CTRL PREMIUM Premium adds more goals, Circle challenges and your full set of personal insights. It's available as a monthly or annual subscription, each with a free trial for eligible new subscribers. Payment is charged to your Apple Account when you confirm your purchase. The subscription renews automatically unless you turn it off at least 24 hours before the current period ends. You can manage or cancel it in your App Store account settings. Terms of Use: https://youreinctrl.com/terms Privacy Policy: https://youreinctrl.com/privacy

Screenshots

Castor Connect3 screens
Ctrl4 screens

Verdict

The call

The clearest difference is in-app purchases: Castor Connect at none against Ctrl's 2. Castor Connect also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.0). Ctrl's advantage is update cadence (daily vs every 2 months). On price and ads there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Ctrl sells 2 in-app purchases, starting at $6.99 per month. Castor Connect asks for nothing beyond the download.

UpkeepUpdate frequency

Castor Connect ships an update every 2 months, Ctrl daily. The most recent releases landed on November 7, 2026 and November 13, 2026 respectively.

Scorecard4 real differences ยท 3 level
Castor Connect versus Ctrl: the parameters behind the verdict, then further details
ParameterCastor ConnectCtrl
PriceFreeFree
Update frequencyEvery 2 monthsDaily โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
MonetizationFreeโ€”
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS13.0 โ€” better18.0
Further details โ€” not scored
Size28 MB62 MB
Age rating4+17+
DeveloperCiwit B.V.You're In Ctrl, Inc.

In-app purchases

None

Castor Connect

No in-app purchases

2 purchases

Ctrl

Subscriptions2
  • Ctrl Premium (Monthly)7 Days trial$6.991 Month
  • Ctrl Premium (Yearly)7 Days trial$49.991 Year

Questions

Is Castor Connect free?
Castor Connect is free to download, with no in-app purchases.
Is Ctrl free?
Ctrl is free to download, with in-app purchases available.
Do Castor Connect or Ctrl have ads?
Neither Castor Connect nor Ctrl shows ads.
Which is updated more often, Castor Connect or Ctrl?
Castor Connect ships an update every 2 months, and Ctrl daily. Most recently, Castor Connect was updated on November 7, 2026 and Ctrl on November 13, 2026.

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