CalCs vs Keya Authenticator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalCs
Enhance your Apple Watch experience with customizable calendar complications. Display dates, events, reminders, and monthly calendars directly on your watch face. Manage your schedule at a glance without needing to open the main app.
- Date display complications
- Event and reminder display
- Monthly calendar view
- Customizable week start day
- Holiday support
- Minimal settings
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CalCs (short for "Calendar Complications") is a watchOS-only app that provides various complications related to the calendar. --Important Notes-- The features built into the main body of this app are limited to listing events/reminders & displaying a monthly calendar. All other features are provided through complications & the Smart Stack. ●If you download CalCs from the iPhone App Store, due to synchronization issues between the iPhone & Apple Watch, CalCs may not appear on the Apple Watch. According to Apple's specifications, watchOS-only apps cannot be re-downloaded from the App Store app on the iPhone. Therefore, please use the App Store app "on your Apple Watch" & follow the steps below to re-download it. ・Scroll to the bottom→"Account"→"Purchased"→"CalCs"→re-download ------------------- Key Features ●Supports a variety of complications such as date display, events/reminders display, & monthly calendar display ・Date Display Displays the current date in various formats. ・Event/Reminder Display Displays events/reminders synced with your iPhone. You can choose whether or not to include all-day events. ・Monthly Calendar Display Displays the monthly calendar in various formats. You can choose to start the week on Monday. Supports holidays in some areas. *Holiday data depends on external APIs & may be incomplete. Only Modular Duo supporting models (Series 7+, not SE series) can show a month calendar using 2 large rectangles. Other models can show it in 1, with smaller font. ●In the main app, events/reminders, & the monthly calendar are displayed Tapping the complication opens the app, where you can view the list of events/reminders synced with your iPhone, as well as the monthly calendar. *Only incomplete reminders are displayed. *The app currently does not have functionality to add, edit, or delete events/reminders, nor to mark reminders as complete. ●Minimal Setting Options To avoid complicating settings on the small Apple Watch screen, the settings only allow you to select which calendar/reminder lists to display. *Notes ・The corner complications, circular complications, & large rectangular complications are supported only on Apple Watch Series 4 & later, so CalCs is not guaranteed to work on Series 3 or earlier models. ・Due to the limitations of watchOS complication display updates, complications may not immediately reflect changes when the date changes or after events or reminders are added or edited on the iPhone. ・After placing a complication for the 1st time, it may take some time for it to actually appear. ・If the complication is not updating, try tapping the complication to open CalCs, as this may refresh the data. ・If the complication is not updated even after launching CalCs, the issue may be resolved by 1 of the following methods. Please try them. 1.Restart both your iPhone & Apple Watch. 2.Force restart CalCs ①With CalCs open, press & hold the side button. ②When the screen for emergency call & power off appears, press & hold the Digital Crown. 3.Reinstall CalCs ①Press the Digital Crown to display the app list. ②Press & hold CalCs, then tap the × button to delete it when it appears. ③Launch the App Store app on your Apple Watch. ④Scroll to the bottom→"Account"→"Purchased"→"CalCs"→Re-download. ・If the complication does not update after force quitting & restarting CalCs, try restarting both your iPhone & Apple Watch, as it may resolve the issue. ・If event information is not displayed on the app's main event/reminder list screen or in complications, it may be because full access to the calendar has not been granted. The issue may be resolved by following the steps below to re-enable full access permission to the calendar. Please give it a try. ①Open the "Privacy & Security" section in the iPhone Settings app & tap "Calendars". ②Change CalCs' calendar access to "None", then select "Add Events Only". ③When you open CalCs, you will be prompted to grant full access, so tap "Allow Full Access".
Keya Authenticator
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Your passwords alone aren't enough. Every account worth protecting deserves a second lock, one that never phones home. Keya Authenticator generates secure one-time codes for any site that supports two-factor authentication, with no account to create, no server to trust, and no subscription to cancel. PRIVATE BY DESIGN Every secret you add stays in the iOS Keychain, encrypted, locked to your device, and invisible the moment your screen goes dark. Keya Authenticator has zero network entitlements, so it physically cannot connect to the internet. NEVER RACE THE CLOCK Most authenticator apps leave you scrambling when a code is about to expire. Keya shows you the next code before the current one runs out, so you always have time to type it in. BIOMETRIC UNLOCK Protect your codes with Face ID or Touch ID, with a PIN fallback always available and automatic lockout after repeated wrong attempts. EASY TO SWITCH Moving from another app is painless: import directly from Google Authenticator, Aegis, 2FAS, Raivo, andOTP, or LastPass, or just scan any standard QR code. ENCRYPTED BACKUPS Export your entire vault as an AES-256-GCM encrypted backup and store it anywhere you like. No cloud account required. OPEN SOURCE Every line of code is publicly available on GitHub under the GPL v3 license, so you can read it, audit it, or build it yourself. That's what trust through transparency actually looks like. FREE, FOREVER There are no ads, no subscription, and no freemium tricks: every feature is available from day one. A voluntary tip jar is the only way to support development, and it's entirely optional. WORKS WITH EVERYTHING Google, GitHub, Apple, Microsoft, Dropbox, Amazon, Discord, and hundreds more: any service built on TOTP (RFC 6238) or HOTP (RFC 4226) works here.
Screenshots
Verdict
The clearest difference is price: Keya Authenticator at Free against CalCs's $0.49. CalCs's advantage is update cadence (every 5 days vs every 3 weeks) and device support (3 vs 1). On 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
Keya Authenticator is free to download; CalCs costs $0.49 up front. CalCs sells 3 one-off in-app purchases and Keya Authenticator sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
CalCs ships an update every 5 days, Keya Authenticator every 3 weeks. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.
| Parameter | CalCs | Keya Authenticator |
|---|---|---|
| Price | $0.49 | Free — better |
| Rating | 4.6 (11 ratings) — better | — |
| Positive reviews | 67.1% of reviews | — |
| Number of ratings | 11 — better | — |
| Update frequency | Every 5 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod, Apple Watch — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 5 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Akihiro Usui | Eldar SHAIDULLIN |
In-app purchases
CalCs
- Snack-Sized Tip$0.49
- Coffee-Sized Tip$1.99
- Lunch-Sized Tip$3.99
Keya Authenticator
- Coffee$2.99
- Pizza$9.99
- Family Dinner$29.99









