Calzy vs ONE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calzy
This app offers a modern and intuitive way to perform everyday calculations. It features a unique Memory Area for reusing values, bookmarking for saved calculations, and leverages the latest iOS technologies for a seamless experience. Designed with privacy in mind, it's suitable for students and professionals alike.
- Memory Area for reusing values
- Calculation bookmarking with titles
- Basic and advanced calculation modes
- Privacy mode with Face ID
- Live Activity and Haptic Touch support
- Customizable keypad layout
- Dark and Light modes
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Make your day-to-day calculations quick, easy, and beautiful with Calzy. Whether you're a student, professional, or just looking for a better way to manage your everyday math, Calzy is the perfect solution. With its advanced features and gorgeous design, Calzy will quickly become your go-to calculator. One of its standout features is the "Memory Area," where you can store and easily reuse multiple numerical values with just a drag and drop. Another one is the bookmarking feature, allowing you to save any calculation with a title for future reference. Using the latest iOS technology, like Live Activity, Drag and Drop, Haptic Touch, Face ID, and more, Calzy makes mathematical problem-solving a seamless experience. And with privacy being our top concern, rest assured your data stays with you. Key Features: • Memory Area for saving and reusing numerical values • Basic and advanced modes • History and Bookmarking with privacy mode (Face ID support) • Clean, modern, and beautiful design • Privacy-conscious app • Multitasking with slide-over and split view for iPad • Haptic Feedback for a more immersive experience • Tax + and Tax - functions • Quick toggle for decimal and currency rounding • Smart parenthesis • Today widget and iMessage extension • Ability to edit keypad layout • Apple Pencil 2 support and external keyboard support • Dynamic type support for enhanced readability • Custom App Icon support for a personalized touch • Universal app for iPhone, Apple Watch, and iPad • Handoff support, start on one device and resume on another • iCloud sync • Dark and Light modes with multiple color accents • Regional support for countries using decimal commas • Instant calculations as you type • Bookmarks are available in the Spotlight search • Universal purchase for all your devices • Family Sharing support • Localized in Chinese, Japanese, French, Italian, Russian and German Powered by the latest iOS technology, Calzy is the calculator for the new age.
ONE
This app uses a digital turntable to help you quickly resolve indecision. Simply set up your options and spin the wheel to get a random choice. It's designed to cure your choice problems and make decisions easier.
- Random choice generator
- Customizable options
- Sound effects toggle
- Intuitive interface
- Decision assistance
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Only ONE, Use the turntable to help you make decisions quickly! Let it cure you of difficult choice! After installation, you can click the settings icon in the upper left corner to open the settings interface to turn on the sound. Privacy Policy: https://appkis.com/privacy-policy.aspx License Agreement: https://appkis.com/terms-of-use.aspx
Screenshots
Verdict
The clearest difference is review sentiment: Calzy at 77% against ONE's 0%. Calzy also leads on update cadence (every 2 days vs every 38 months) and chart position (#65 vs unranked). ONE's advantage is in-app purchases (none vs 3) and iOS requirement (15 vs 26.0). 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
Calzy costs $1.99 and ONE $1.29 up front. Calzy sells 3 one-off in-app purchases. ONE asks for nothing beyond the download.
Calzy ships an update every 2 days, ONE every 38 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | Calzy | ONE |
|---|---|---|
| Price | $1.99 | $1.29 — better |
| Rating | 4.7 (1.9K ratings) — better | — |
| Positive reviews | 76.6% of reviews — better | 0.0% of reviews |
| Number of ratings | 1.9K — better | — |
| Update frequency | Every 2 days — better | Every 38 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Best chart rank | #65 — better | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 26.0 | 15 — better |
| Further details — not scored | ||
| Size | 66 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Raja Vijayaraman | Zhongshan AppKIS Software Studio (Individually Owned Business) |
Customer experience
Calzy
ONE
In-app purchases
Calzy
- Small Tip$0.99
- Medium Tip$3.99
- Huge Tip$9.99
ONE
No in-app purchases









