CAL_ vs Simple Calendar & Diary
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
CAL_
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CAL_ is the next evolution of calculators. Made especially for iPhone, it brings the venerable calculator to an all-new level. LOG FEATURE All of your calculations are logged, so you can refer to them at any time. Use the ANS key to bring up the most recent result from the log. You can toggle commas and decimal points, and also use a guide that shows you when your units are in the millions, billions, and beyond. CURRENCY CONVERSIONS Get real-time currency rates for up to three currencies at once. You can also see a graph of currency value fluctuations. UNIT CONVERSIONS Want to know how many Tokyo Domes there are to an acre? Or how many lbs make up a stone? It's right at your fingertips in CAL_.
Simple Calendar & Diary
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You can write a diary on the calendar using this app.
Screenshots
Verdict
The clearest difference is ads: CAL_ at none against Simple Calendar & Diary's shown. CAL_ also leads on update cadence (every 4 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CAL_ ships an update every 4 days, Simple Calendar & Diary every 3 weeks. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.
| Parameter | CAL_ | Simple Calendar & Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days β better | Every 3 weeks |
| Ads | No β better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details β not scored | ||
| Size | 9 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | SQUAIR Inc. | Yuichi HARA |
In-app purchases
CAL_
No in-app purchases
Simple Calendar & Diary
No in-app purchases
Questions
Is CAL_ free?
Is Simple Calendar & Diary free?
Do CAL_ or Simple Calendar & Diary have ads?
Which is updated more often, CAL_ or Simple Calendar & Diary?
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