# Calculator· vs Hydro Connect

The clearest difference is in-app purchases: Hydro Connect at none against Calculator·'s 3. Hydro Connect also leads on ads (none vs shown) and review sentiment (100% vs 84%). Calculator·'s advantage is ratings volume (34K vs 5) and update cadence (every 3 months vs every 8 months). On price, rating and device support there is nothing between them.

Both are free to download. Calculator· sells 3 in-app purchases, starting at $0.99 per month. Hydro Connect asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Calculator· against 5.0 for Hydro Connect. That said, the two scores are not equally well evidenced: Calculator· has 34K ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 84% of Calculator·'s written reviews are positive against 100% of Hydro Connect's.

Calculator· ships an update every 3 months, Hydro Connect every 8 months. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Calculator· | Hydro Connect |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (34K ratings)](https://appshunter.io/ios/app/calculator/id554836784/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/hydro-connect/id1574515164/reviews)** |
| Number of ratings | **34K** | 5 |
| Positive reviews | 84.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 47 MB | 27 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tim O's Studios, LLC](https://appshunter.io/developer/412839685) | [Hydro Systems Company](https://appshunter.io/developer/1574515166) |

## What reviewers say

### Calculator·

[App page](https://appshunter.io/ios/app/calculator/id554836784)

This app offers a straightforward calculation experience, focusing on essential functions without unnecessary complexity. It includes basic arithmetic, percentage calculations, and advanced functions like square root. Users can customize the appearance with multiple color schemes and utilize features like result copying and split-screen multitasking on iPad.

**Highlights:** Basic arithmetic operations, Percentage calculations, Multiple color schemes, Copy results, Square, square root, inverse functions, iPad Split View support, Apple Watch support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade App | $0.99 | per month |
| Upgrade App | $4.99 | per year |
| Upgrade App | $1.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Quick and responsive
- 💡 Percentage function works well
- 👍 Large, clear buttons
- 👍 Straightforward, no-frills design

**What reviewers complain about**

- 🔋 Frequent ads can be distracting
- 🐛 Occasional crashes or freezes
- 🔒 Lack of customization options
- 💡 No backspace/undo function
- 💡 Missing advanced features like memory

**Reported bugs**

- Crashes when performing long calculations
- Freezes when opening the app
- Incorrect results for some complex calculations

**Requested features**

- Add a backspace/undo button
- Implement a history/memory feature
- Provide more customization options
- Reduce frequency of ads


### Hydro Connect

[App page](https://appshunter.io/ios/app/hydro-connect/id1574515164)

This app connects to chemical dispensing systems via Bluetooth, allowing users to access dispensing data, set up local dispensers, and log data for advanced analytics. It also provides troubleshooting tools and links to marketing content.

**Highlights:** BLE connectivity to dispensing units, Access current and historic dispensing data, Local dispenser setup, Data logging for analytics, Enhanced troubleshooting interface, Links to digital marketing content

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculator· free?

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

### Is Hydro Connect free?

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

### Which has better reviews, Calculator· or Hydro Connect?

Hydro Connect is rated higher. Calculator· averages 4.9 out of 5 from 34K ratings, while Hydro Connect averages 5.0 from 5 ratings.

### Do Calculator· or Hydro Connect have ads?

Calculator· shows ads; Hydro Connect does not.

### Which is updated more often, Calculator· or Hydro Connect?

Calculator· ships an update every 3 months, and Hydro Connect every 8 months. Most recently, Calculator· was updated on October 20, 2026 and Hydro Connect on October 8, 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.*