ZyTools vs Parallel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZyTools
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.
- Bluetooth device testing
- Read/write support
- Notification handling
- Signal strength monitoring
- Basic device info
- Preset command tests
- Data logging
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专门用于蓝牙设备测试的工具，只针对一些兼容蓝牙协议的设备。包括对读、写和通知的全面支持，您可以查看信号强度，以了解您与外围设备的距离。可以查看基本设备信息以及预设命令测试，全面记录显示测试数据
Parallel
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.
- 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
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Parallel. Calculate more. DO MORE AT ONCE Why calculate one thing at a time? Run 2, 3, or 4 calculations side by side, and arrange them however you like with drag and drop. No more memorizing one result just to punch it into the next — it's all already on screen. That's the whole idea behind the name. ONLY WHAT YOU NEED No bloat, no clutter. Scientific mode covers exactly what you'd expect from a real scientific calculator — nothing more, nothing less. The converter covers 57 world currencies plus Bitcoin, Ethereum, and a handful of other crypto. Simple, on purpose. YOUR HISTORY, YOUR CALL Parallel only saves what you choose to keep — each calculation with your own note attached, kept separate for standard and scientific mode. Share any result straight from history, wherever you need it. Prefer to keep it private? Lock it all behind Face ID or your passcode. MADE TO FEEL RIGHT Swipe between calculator, scientific mode, and converter. Feel every tap with haptic feedback. Add a widget to your Home Screen, or pull it up instantly from Quick Menu. MAKE IT YOURS Free with the Classic theme. Unlock 10 named themes, a set of distinctive fonts, and the 4-screen layout with Parallel Pro — a one-time purchase, no subscription, ever. Your calculator has never looked this good. No ads. No data collected. Available in 34 languages.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ZyTools | Parallel |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 4 — better |
| Update frequency | Every 6 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, Apple Watch |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 16 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Zhen Yi Chuang Xiang Technology Co. LTD | Evgenii Chizhov |
In-app purchases
ZyTools
No in-app purchases
Parallel
- Parallel Pro$2.99
