# Time Duration/Add Calculator vs MamoLens

The clearest difference is in-app purchases: Time Duration/Add Calculator at none against MamoLens's 3. Time Duration/Add Calculator also leads on iOS requirement (13.0 vs 17.0). MamoLens's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. MamoLens sells 3 one-off in-app purchases. Time Duration/Add Calculator asks for nothing beyond the download.

## The numbers

| Metric | Time Duration/Add Calculator | MamoLens |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/time-durationadd-calculator/id1521417824/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | — |
| Monetization | Ad-supported | — |
| Size | 17 MB | 77 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kouji Yamauchi](https://appshunter.io/developer/1519365107) | [Mendoxa LLC](https://appshunter.io/developer/1816388997) |

## What reviewers say

### Time Duration/Add Calculator

[App page](https://appshunter.io/ios/app/time-durationadd-calculator/id1521417824)

Easily calculate elapsed time between two points or determine an end time based on a start time and duration. It also converts time into various units like days, hours, minutes, and seconds.

**Highlights:** Calculate elapsed time from start and end times, Calculate end time from start time and elapsed duration, Display time between start and end dates/times, Convert time into days, hours, minutes, and seconds, Easily enter current time, Calculate time before a given duration

**Features:** macOS Compatibility

**In-app purchases:** none


### MamoLens

[App page](https://appshunter.io/ios/app/mamolens-safe-qr-code-scanner/id6794392981)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip (Buy me a coffee) | $0.49 | one-time |
| Great Tip (Buy me lunch) | $2.99 | one-time |
| Huge Tip (Full Support!) | $5.99 | one-time |


## Frequently asked questions

### Is Time Duration/Add Calculator free?

Time Duration/Add Calculator is free to download, with no in-app purchases.

### Is MamoLens free?

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

### Do Time Duration/Add Calculator or MamoLens have ads?

Time Duration/Add Calculator shows ads; MamoLens does not.

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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.*