# The Estimation Project vs Abikalender

The clearest difference is iOS requirement: The Estimation Project at 12.0 against Abikalender's 18.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

The Estimation Project ships an update every 9 days, Abikalender every 2 weeks. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | The Estimation Project | Abikalender |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 55 MB | 19 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [UniTransferKlinik Lübeck GmbH](https://appshunter.io/developer/1798700422) | [Benedikt Purkott](https://appshunter.io/developer/1848470348) |

## What reviewers say

### The Estimation Project

[App page](https://appshunter.io/ios/app/the-estimation-project/id6742491996)

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

**In-app purchases:** none


### Abikalender

[App page](https://appshunter.io/ios/app/abikalender/id6756822711)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is The Estimation Project free?

The Estimation Project is free to download, with no in-app purchases.

### Is Abikalender free?

Abikalender is free to download, with no in-app purchases.

### Do The Estimation Project or Abikalender have ads?

Neither The Estimation Project nor Abikalender shows ads.

### Which is updated more often, The Estimation Project or Abikalender?

The Estimation Project ships an update every 9 days, and Abikalender every 2 weeks. Most recently, The Estimation Project was updated on October 5, 2026 and Abikalender on October 2, 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.*