Calndars vs Things Happen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calndars
Effortlessly convert dates between over 30 major calendar systems, including Gregorian, Islamic, and Chinese. This utility is designed for global professionals and researchers needing precise cross-cultural date translations. Integrates with widgets and Shortcuts for seamless workflow.
- Convert dates across 30+ calendar systems
- Supports Gregorian, Islamic, Chinese, Hebrew, Persian, and more
- Native experience on iPhone, iPad, Mac, Apple Watch
- Customizable widgets
- Shortcuts integration
- AppleScript support on macOS
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Convert dates across cultures with precision and speed. Calndars is a powerful yet minimal calendar converter designed for global professionals, researchers, and anyone working across time systems. Instantly translate dates between major calendar systems including Gregorian, Hebrew, Islamic, Chinese, Persian, and more. Whether you're coordinating international projects or exploring historical timelines, Calndars delivers accurate results in seconds. Built with modern Apple technologies, the app offers a fast, native experience across iPhone, iPad, Mac, and Apple Watch. Customize your workflow with widgets, favorites, and seamless Shortcuts integration. Designed for efficiency and clarity, Calndars supports over 30 languages and integrates smoothly into your daily tools—without collecting any personal data. A focused utility for a global world. FEATURES - Calndars is the best app to converts dates between the most used calendars in the world. - Select a calendar to set a date, and get the corresponding date in another calendar. - Copy the date to use it in another app. - Add a calendar to the favourites by tapping the star. - Add a calendar to the widgets by tapping the 4 squares icon. - Calendars can be reordered in the list. INTEGRATION - The app supports small, medium and large widgets. - Create a Shortcut in the Apple's Shortcuts App and use the Shortcut everywhere. - Use AppleScript on MacOS for integration between Calndars and other Apps. CALENDARS Calendars to convert between are: - Buddhist - Chinese - Coptic - Ethiopic (Amete Alem) - Ethiopic (Amete Mihret) - Gregorian - Hebrew - indian - Islamic Civil - Islamic Tabular - Islamic Umm Al Qura - Japanese - Persian - Taiwanese - Bangla - Gujarati - Kannada - Malayalam - Marathi - Odia - Tamil - Telugu - Vikram - Dangi - Vietnamese PLATFORM OR DEVICES - iPhone - iPad - Mac - AppleWatch.
Things Happen
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Don't remember when you bought contact lenses? When was the last time the flowers were watered? Things Happen app will help you. Mark your affairs on the calendar and setup notifications. Keep up to date when it's time to get down to business. Things can be absolutely anything, such as buying contact lenses, a blood test, an ultrasound, watering flowers or something else that is important to you. Application Features: - calendar: you can see what and when the last time you did - notifications: let you remember what needs to be done - list or grid things display
Screenshots
Verdict
The clearest difference is price: Things Happen at Free against Calndars's $3.99. Things Happen also leads on iOS requirement (11.0 vs 26.0). Calndars's advantage is in-app purchases (none vs 2) and ads (none vs shown). On update cadence and device support 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
Things Happen is free to download; Calndars costs $3.99 up front. Things Happen sells 2 one-off in-app purchases. Calndars asks for nothing beyond the download.
Calndars ships an update every 5 weeks, Things Happen every 2 months. The most recent releases landed on October 6, 2026 and October 18, 2026 respectively.
| Parameter | Calndars | Things Happen |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPod |
| Requires iOS | 26.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 91 MB |
| Age rating | 4+ | 4+ |
| Developer | Geert Jadoul | Natalia Tsybulenka |
In-app purchases
Calndars
No in-app purchases
Things Happen
- 5 Things$0.99
- No Limits$1.99









