# Calculi vs Simpool Tech

The clearest difference is in-app purchases: Simpool Tech at none against Calculi's 4. Simpool Tech also leads on update cadence (every 2 weeks vs every 2 months) and iOS requirement (14.0.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Calculi sells 4 in-app purchases, starting at $2.99 per year. Simpool Tech asks for nothing beyond the download.

Calculi ships an update every 2 months, Simpool Tech every 2 weeks. The most recent releases landed on October 22, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Calculi | Simpool Tech |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (383 ratings)](https://appshunter.io/ios/app/calculi-scientific-calculator/id452182503/reviews)** | — |
| Number of ratings | **383** | — |
| Positive reviews | 35.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 61 MB |
| Requires iOS | 17.6 | **14.0.0** |
| Devices | **iPhone, iPad, Apple TV, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Michael Natole, Jr.](https://appshunter.io/developer/443621043) | [Simpool Technologies, LLC](https://appshunter.io/developer/1872135320) |

## What reviewers say

### Calculi

[App page](https://appshunter.io/ios/app/calculi-scientific-calculator/id452182503)

A smart and powerful calculator designed for ease of use, offering advanced scientific functions, unit and currency conversion, and a supercharged history tape. It adapts to various devices and supports external keyboards for enhanced functionality.

**Highlights:** Complex expression solving, Unit conversion (17 categories), Currency conversion (30+ currencies), Scientific constants, Supercharged history tape, iMessage app integration, Apple Watch app

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculi Pro | $2.99 | per year |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |

**What reviewers like**

- 👍 Better than stock iPhone calculator
- 📈 History screen with past answers/expressions
- 🔄 Regular helpful updates
- ⌨️ Works with keyboard
- 🗂️ Works in Split Screen

**What reviewers complain about**

- ⚠️ Pop-up rating requests
- 💸 Added ads in updates
- 🎛️ Clutter of unused keys on iPad
- 🐛 Buggy history feature
- 💥 Crashes during multiplication

**Reported bugs**

- Calculation not appearing in history until app restart
- New calculation replaces previous in history tile
- Crashes when multiplying by 1.03
- Physical iPad keyboard not recognized
- App crashes/closes on iPad iOS 13

**Requested features**

- Option for Dark Mode all the time
- Option to choose icons
- Fix Slide Over functionality


### Simpool Tech

[App page](https://appshunter.io/ios/app/simpool-tech/id6758308729)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calculi free?

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

### Is Simpool Tech free?

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

### Do Calculi or Simpool Tech have ads?

Neither Calculi nor Simpool Tech shows ads.

### Which is updated more often, Calculi or Simpool Tech?

Calculi ships an update every 2 months, and Simpool Tech every 2 weeks. Most recently, Calculi was updated on October 22, 2026 and Simpool Tech on October 16, 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.*