# ZyTools vs Parallel

The clearest difference is in-app purchases: ZyTools at none against Parallel's 1. ZyTools also leads on iOS requirement (12.0 vs 18.0). Parallel's advantage is update cadence (every 6 days vs every 6 weeks). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Parallel sells 1 one-off in-app purchase. ZyTools asks for nothing beyond the download.

ZyTools ships an update every 6 weeks, Parallel every 6 days. The most recent releases landed on November 8, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | ZyTools | Parallel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/parallel-multi-calculator/id6794806258/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 6 days** |
| Monetization | Free | Free |
| Size | 16 MB | 16 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Zhen Yi Chuang Xiang Technology Co. LTD](https://appshunter.io/developer/1629372828) | [Evgenii Chizhov](https://appshunter.io/developer/6794806260) |

## What reviewers say

### ZyTools

[App page](https://appshunter.io/ios/app/zytools/id6498898870)

This utility app provides comprehensive tools for testing Bluetooth devices. It supports reading, writing, and notifications, allowing users to check signal strength and view basic device information. Preset command tests and detailed data logging are also included.

**Highlights:** Bluetooth device testing, Read/write support, Notification handling, Signal strength monitoring, Basic device info, Preset command tests, Data logging

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

**In-app purchases:** none


### Parallel

[App page](https://appshunter.io/ios/app/parallel-multi-calculator/id6794806258)

Perform multiple calculations simultaneously with a drag-and-drop interface. Features a scientific calculator, currency and crypto converter, and history saving with optional privacy locks. Customize with themes and fonts.

**Highlights:** Run 2, 3, or 4 calculations side-by-side, Drag and drop calculation arrangement, Scientific calculator mode, Currency and crypto converter, Save calculation history with notes, Face ID/passcode lock for privacy, Home screen widget and Quick Menu access

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Parallel Pro | $2.99 | one-time |


## Frequently asked questions

### Is ZyTools free?

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

### Is Parallel free?

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

### Do ZyTools or Parallel have ads?

Neither ZyTools nor Parallel shows ads.

### Which is updated more often, ZyTools or Parallel?

ZyTools ships an update every 6 weeks, and Parallel every 6 days. Most recently, ZyTools was updated on November 8, 2026 and Parallel on November 6, 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.*