# Rapid & Quick Calculator vs Eider

The clearest difference is ads: Eider at none against Rapid & Quick Calculator's shown. Eider also leads on update cadence (every 2 weeks vs every 5 months) and rating (5.0 vs 4.8). Rapid & Quick Calculator's advantage is ratings volume (1.5K vs 6). On price, in-app purchases and device support there is nothing between them.

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

Eider holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Rapid & Quick Calculator has 1.5K ratings behind it against 6, so its average is the more settled of the two.

Rapid & Quick Calculator ships an update every 5 months, Eider every 2 weeks. The most recent releases landed on October 14, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Rapid & Quick Calculator | Eider |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (1.5K ratings)](https://appshunter.io/ios/app/rapid-and-quick-calculator/id1046214532/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/eider-split-expenses/id6780000984/reviews)** |
| Number of ratings | **1.5K** | 6 |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 7 MB | 56 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KinkumaDesign](https://appshunter.io/developer/385697725) | [Loftery LLC](https://appshunter.io/developer/6780000987) |

## What reviewers say

### Rapid & Quick Calculator

[App page](https://appshunter.io/ios/app/rapid-and-quick-calculator/id1046214532)

A user-friendly calculator with essential functions and advanced features like tax and discount calculations. Easily reuse past calculations or edit expressions with intuitive controls. Offers customization options for themes and fonts.

**Highlights:** History Tape for reusing answers, Sales tax calculations, Discount calculations, Precise rounding settings, Customizable themes and fonts, Editable expressions with cursor keys, Share expressions and answers

**Features:** Vision Pro support

**In-app purchases:** none


### Eider

[App page](https://appshunter.io/ios/app/eider-split-expenses/id6780000984)

Easily track and settle shared expenses for trips, households, or any group. This app handles the calculations, showing who owes whom with simplified payment suggestions. Settle up using your preferred payment apps without any money changing hands within the application.

**Highlights:** Track shared expenses for trips and home, Calculate who owes whom with simplified settlements, Add expenses in seconds with remembered splits, Split by percentage, exact amounts, or evenly, Set up recurring expenses, Integrates with popular payment apps for settlement

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

**In-app purchases:** none


## Frequently asked questions

### Is Rapid & Quick Calculator free?

Rapid & Quick Calculator is free to download, with no in-app purchases.

### Is Eider free?

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

### Which has better reviews, Rapid & Quick Calculator or Eider?

Eider is rated higher. Rapid & Quick Calculator averages 4.8 out of 5 from 1.5K ratings, while Eider averages 5.0 from 6 ratings.

### Do Rapid & Quick Calculator or Eider have ads?

Rapid & Quick Calculator shows ads; Eider does not.

### Which is updated more often, Rapid & Quick Calculator or Eider?

Rapid & Quick Calculator ships an update every 5 months, and Eider every 2 weeks. Most recently, Rapid & Quick Calculator was updated on October 14, 2026 and Eider on October 15, 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.*