DuoCal vs Chikuwa Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DuoCal
Compare monthly calendars side-by-side from different years or months. Organize events with customizable labels and share your schedule with others. Syncs with iOS and Google calendars.
- Side-by-side calendar view
- Multiple calendar creation
- Calendar sharing via Dropbox
- iOS and Google Calendar sync
- Customizable labels with colors and sizes
- Label templates
- Memos separate from dates
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DuoCal ~Compare Calendars Side by Side~ DuoCal allows you to line up calendars of the same month of different years or any other months you like top-and-bottom and compare them. ●DuoCal Features ・Allows you to create calendars for different purposes and easily switch between them. ・Allows you to display 2 calendars top-and-bottom, making it easy to compare monthly calendars for different months and years or various monthly calendars in different years, for example. ・Allows you to easily share your calendars with multiple people. (Sharing calendars require both the inviter and invitee to have Dropbox accounts. DuoCal account registration is not required.) ・Allows you to sync iOS calendars. You can also sync your Google calendar by syncing your Google Calendar with your iOS calendar. ・You may attach as many labels to your calendar as you want for different purposes. You can choose between 34 colors and 4 sizes as well as 2 types, text only or image+text. ・You can also create label templates. By creating label templates you frequently use, you can customize your calendar to make it easier for you to use. ・You may also attach labels to parts other than the dates on your calendar or create short memos separate from the dates. ●Usage example ・You can use it like a 5 year calendar or 10 year calendar. By using the labels as diaries with photos, you can easily relive your memories in the current month 1 year or 5 years ago. ・As you can create multiple calendars separated by various purposes such as private, work, family, and more, you can make a calendar that is easy to view. Additionally, by lining them up top-and-bottom, you can plan your work schedule while comparing it with your private schedule. ・Use the share function to easily share the information with your family or acquaintances. You can use it like a portable fridge calendar. ・By recording reservations or revenue on labels, you can compare reservation status for the same month between different years and between different months. ・You can also record events with clients in the previous year on your calendar and display this year’s calendar on top and last year's calendar at the bottom to establish the year’s plan to fit your client’s needs while checking last year’s circumstances. ・You can use the share function to easily sync the information between multiple devices. For example, you can use your tablet at home and your smartphone when outside to manage your schedule. ●DuoCal Convenient Features (Calendar Management) ・Allows you to combine calendars. You can easily combine calendars that you created separately into a single calendar. (Calendar View) ・You can use pinch-to-zoom to enlarge the calendar. If your phone screen is small, making it difficult to view the labels, you can intuitively enlarge it. ・Tap the View Mode button to switch to View Mode. In View Mode, you can zoom in on the data by tapping and holding on specific dates. This feature is useful for quickly checking all the details. (Calendar Sharing) ・You can share your calendar with multiple people by using Dropbox. All you need to do is send an Invite email to the person you want to share it with. No DuoCal account registration is required. ・Send an email to yourself to sync your calendar on multiple devices such as your smartphone and tablet. (Other Features) ・You can also backup your calendar to iCloud Drive. ●Use add-ons to add functionality ・Purchase add-ons to remove ads and increase the display area. This will make it easier to view the calendars when you line them up top-and-bottom. ・You can import Palu Calendar backup files. You can import calendars that you have created on Palu to DuoCal. (Calendars imported from Palu cannot be edited.) *”Dropbox” is a trademark or registered trademark of Dropbox, Inc. *”Palu” is a product of MetaMoJi Corporation. *The screenshot shown here is the app with add-ons that remove ads.
Chikuwa Diary
This app allows you to journal, track books and movies, and organize ideas using multiple notebooks. It offers automatic iCloud syncing for seamless access across devices and supports image attachments. Organize your life's moments and information effortlessly.
- Multiple notebooks for different themes
- Book tracking with information retrieval
- Movie recording and search
- Collection feature for organizing information
- Automatic iCloud notebook sync
- Image attachment support
- Widget support
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Chikuwa Diary can be writed to keep a diary as well as record books, movies, and ideas. -- Feature List -- ・ Use of Multiple Notebooks For themes of different genres, you can switch the notebook. ・ Books Management Feature Created to make it easier to record your reading. You can get the information from the code number of the book you read. This application can also record the number of pages and words (use for extensive reading) ・ Movies Management Feature Created to make it easier to record movies. You can search by title. ・ Collection Feature Added to organize various information saved in the app freely. ・ Automatic Notebook Sync Feature You can automatically sync your notebook using iCloud. Once synced, you can access your notebook from other devices. ・ Image Feature This is a general image addition function. Save to iCloud. ・ Widget support
Screenshots
Verdict
The clearest difference is update cadence: Chikuwa Diary at every 4 weeks against DuoCal's every 3 months. DuoCal's advantage is review sentiment (100% vs 83%) and iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and monetization model 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
Both are free to download. DuoCal sells 2 one-off in-app purchases and Chikuwa Diary sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
DuoCal ships an update every 3 months, Chikuwa Diary every 4 weeks. Both last shipped on November 3, 2026.
| Parameter | DuoCal | Chikuwa Diary |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews — better | 83.3% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 4 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 39 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | WAZAnauts LLC | Tenta Shinojima |
Customer experience
DuoCal
Chikuwa Diary
In-app purchases
DuoCal
- Import Palu calendars$0.99
- Remove Ads$8.99
Chikuwa Diary
- Chikuwa+ Plan for 1 months$3.991 Month
- Chikuwa+ Plan for 6 months$14.996 Months









