# Date and time calc vs Carbon Notes

The clearest difference is in-app purchases: Date and time calc at none against Carbon Notes's 2. Carbon Notes's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 16 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Carbon Notes sells 2 in-app purchases, starting at $19.99 per month. Date and time calc asks for nothing beyond the download.

Date and time calc ships an update every 16 months, Carbon Notes every 3 weeks. The most recent releases landed on July 23, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Date and time calc | Carbon Notes |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 23.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 16 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 6 MB | 12 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Osamu Ishigami](https://appshunter.io/developer/901265058) | [YMMV](https://appshunter.io/developer/1224453829) |

## What reviewers say

### Date and time calc

[App page](https://appshunter.io/ios/app/date-and-time-calc/id949261920)

Easily calculate the difference between dates or add/subtract time intervals. This utility app simplifies date and time arithmetic with straightforward operations.

**Highlights:** Date difference calculation, Date addition and subtraction, Time difference calculation, Time addition and subtraction

**Features:** macOS Compatibility

**In-app purchases:** none


### Carbon Notes

[App page](https://appshunter.io/ios/app/carbon-notes/id6748026908)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $19.99 | per month |
| AI Unlock | $4.99 | one-time |


## Frequently asked questions

### Is Date and time calc free?

Date and time calc is free to download, with no in-app purchases.

### Is Carbon Notes free?

Carbon Notes is free to download, with in-app purchases available.

### Do Date and time calc or Carbon Notes have ads?

Date and time calc shows ads; Carbon Notes does not.

### Which is updated more often, Date and time calc or Carbon Notes?

Date and time calc ships an update every 16 months, and Carbon Notes every 3 weeks. Most recently, Date and time calc was updated on July 23, 2026 and Carbon Notes on September 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*