# Calculator 17 vs Zephyr

The clearest difference is review sentiment: Zephyr at 100% against Calculator 17's 22%. Zephyr also leads on rating (5.0 vs 4.6). Calculator 17's advantage is price (Free vs $1.99) and in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Calculator 17 is free to download; Zephyr costs $1.99 up front. Zephyr sells 2 in-app purchases, starting at $14.99 per year. Calculator 17 asks for nothing beyond the download.

Zephyr holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Calculator 17 has 990 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 22% of Calculator 17's written reviews are positive against 100% of Zephyr's.

Calculator 17 ships an update every 4 days, Zephyr every 10 days. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Calculator 17 | Zephyr |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.6 (990 ratings)](https://appshunter.io/ios/app/calculator-17-math-solver/id6452015902/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zephyr-truenas-scale-manager/id6761456992/reviews)** |
| Number of ratings | **990** | 2 |
| Positive reviews | 21.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 10 days |
| Monetization | **Free** | Paid |
| Size | 5 MB | 13 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AI APPS SRL](https://appshunter.io/developer/1697892814) | [Joshua Marx Donvito](https://appshunter.io/developer/1858844285) |

## 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


### Zephyr

[App page](https://appshunter.io/ios/app/zephyr-truenas-scale-manager/id6761456992)

Manage your TrueNAS Scale NAS with a native iOS app. Offers a polished mobile experience for checking pool health, restarting apps, and investigating alerts. Includes an AI assistant for plain-language queries and actions.

**Highlights:** Native iOS interface for TrueNAS Scale, AI assistant for plain-language queries, Actionable assistant for tasks like scrubs and snapshots, App and container management, Storage and data management, Share and networking configuration, Built-in monitoring and reporting, Security audit and antivirus scanning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zephyr Pro Yearly | $14.99 | per year |
| Zephyr Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Calculator 17 free?

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

### Is Zephyr free?

Zephyr costs $1.99, and also offers in-app purchases.

### Which has better reviews, Calculator 17 or Zephyr?

Zephyr is rated higher. Calculator 17 averages 4.6 out of 5 from 990 ratings, while Zephyr averages 5.0 from 2 ratings.

### Do Calculator 17 or Zephyr have ads?

Neither Calculator 17 nor Zephyr shows ads.

### Which is updated more often, Calculator 17 or Zephyr?

Calculator 17 ships an update every 4 days, and Zephyr every 10 days. Most recently, Calculator 17 was updated on November 7, 2026 and Zephyr on November 5, 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.*