# Calculator 17 vs Otter!

The clearest difference is in-app purchases: Calculator 17 at none against Otter!'s 3. Calculator 17 also leads on iOS requirement (16.0 vs 18.2). Otter!'s advantage is update cadence (every 2 days vs every 4 days). On price, ads and device support there is nothing between them.

Both are free to download. Otter! sells 3 one-off in-app purchases. Calculator 17 asks for nothing beyond the download.

Calculator 17 ships an update every 4 days, Otter! every 2 days. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Calculator 17 | Otter! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (971 ratings)](https://appshunter.io/ios/app/calculator-17-math-solver/id6452015902/reviews)** | — |
| Number of ratings | **971** | — |
| Positive reviews | 21.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 2 days** |
| Monetization | Free | — |
| Size | 5 MB | 4 MB |
| Requires iOS | **16.0** | 18.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AI APPS SRL](https://appshunter.io/developer/1697892814) | [HYRE Talent Sourcing and Matching](https://appshunter.io/developer/1871355239) |

## What reviewers say

### Calculator 17

[App page](https://appshunter.io/ios/app/calculator-17-math-solver/id6452015902)

This app offers a user-friendly calculator with basic and scientific modes. Access calculations instantly via a home screen widget and review past computations in a saved history.

**Highlights:** User-friendly interface, Basic and scientific modes, Home screen widget, LiveActivity Standby for iPhone, Calculation history, Customizable themes

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

**In-app purchases:** none

**What reviewers like**

- 👍 Convenient and easy to use
- 💡 Excellent free app

**What reviewers complain about**

- 🐛 Keyboard not functioning properly
- 🐛 Widget not working or slow
- 🐛 Screen sizing issues
- 🐛 Only works in portrait mode on iPad

**Reported bugs**

- Widget shows up blank
- Numerical display is cut off
- Significant delay between key presses and display update

**Requested features**

- Add landscape mode support
- Improve widget responsiveness
- Increase bracket functionality


### Otter!

[App page](https://appshunter.io/ios/app/otter/id6758372229)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Donation | $0.99 | one-time |
| Medium Donation | $4.99 | one-time |
| Large Donation | $9.99 | one-time |


## Frequently asked questions

### Is Calculator 17 free?

Calculator 17 is free to download, with no in-app purchases.

### Is Otter! free?

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

### Do Calculator 17 or Otter! have ads?

Neither Calculator 17 nor Otter! shows ads.

### Which is updated more often, Calculator 17 or Otter!?

Calculator 17 ships an update every 4 days, and Otter! every 2 days. Most recently, Calculator 17 was updated on October 12, 2026 and Otter! on October 7, 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.*