Draw vs Calctan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Draw
This application allows users to create drawings using digital tools. It provides a platform for users to produce pictures, patterns, or diagrams with a digital pencil or pen.
- Digital drawing
- Pencil and pen tools
- Create pictures
- Produce patterns
- Make diagrams
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When you draw, or when you draw something, you use a pencil or pen to produce a picture, pattern, or diagram.
Calctan
This sophisticated calculator app offers a minimalist design with advanced mathematical functions and extensive personalization options. It seamlessly syncs across devices and includes multitasking features for enhanced productivity.
- Intuitive minimalist design
- 100+ customizable themes
- 47 advanced mathematical functions
- Automatic calculation history
- iCloud sync across devices
- Split Screen and Swipe Mode multitasking
- Share calculations easily
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Calctan is a sophisticated calculator app designed for iOS devices (iPhone and iPad), celebrated for its elegant, minimalist design and robust functionality that surpasses traditional calculators. Tailored for students, professionals in mathematics, physics, engineering, and anyone seeking a highly customizable and intuitive calculation tool, Calctan combines advanced mathematical capabilities with a seamless user experience. Its sleek interface and extensive personalization options make it both a practical tool and a visually appealing addition to your device. The app’s commitment to user-centric design is evident in its seamless integration with iOS ecosystems. With iCloud sync, your calculations and preferences are always up-to-date, whether you’re switching between devices or collaborating on the go. Features like Split Screen and Swipe Mode empower iPad users to maximize productivity, while the ability to share calculations fosters effortless communication. Calctan is more than a calculator—it’s a dynamic, adaptable tool that elevates your calculation experience with style, precision, and efficiency. Key Features: 1. Intuitive Design: Calctan’s clean, minimalistic interface prioritizes usability, presenting essential calculator elements in a clear, distraction-free layout that ensures effortless navigation and operation. 2. Personalized Interface: Choose from 100 pre-installed themes or craft a unique look with a custom color picker. Fine-tune button corner radius, spacing, and layout to optimize comfort and readability, allowing the app to reflect your personal style. 3. Advanced Math: Access 47 powerful functions, including trigonometric operations (sine, cosine, tangent, and their inverses), percentages for budgeting, exponents, logarithms (base-10, natural, base-2), and roots (square, cube). Switch between degrees and radians, compute factorials for permutations, or use absolute values and reciprocals—perfect for scientific, technical, and financial calculations. 4. Calculation History: Automatically saves and organizes your calculations, enabling you to revisit, edit, or reuse past results with ease, streamlining complex workflows. 5. iCloud Sync: Seamlessly syncs calculations and customizations across your iPhone and iPad, ensuring a consistent and cohesive experience across all your devices. 6. Multitasking Modes: - Split Screen Mode: On iPad, use Calctan alongside another app, such as performing calculations while referencing a document or spreadsheet. - Swipe Mode: Access a second app at the bottom of the screen while keeping Calctan active at the top, enhancing productivity for multitasking users. 7. Share Calculations: Share results effortlessly via email, text, or other apps, making collaboration and communication quick and convenient. Additional Highlights: • Library of basic mathematical constants • Random color theme generator for creative inspiration • Engaging sounds and animations for a dynamic user experience • Adjustable decimal places, currency symbols, and thousands separators • Dark Mode support for comfortable use in low-light environments • Comprehensive settings menu for full control over app preferences • Detailed user manual for easy onboarding and reference
Screenshots
Verdict
The clearest difference is rating: Calctan at 4.5 against Draw's 2.2. Calctan also leads on ratings volume (61 vs 5). Draw's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 3 months). On price, review sentiment, in-app purchases and monetization model 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. Draw sells 3 one-off in-app purchases and Calctan sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Calctan holds the better App Store score, 4.5 against 2.2. That said, the two scores are not equally well evidenced: Calctan has 61 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 26% of Draw's written reviews are positive against 29% of Calctan's.
Draw ships an update every 6 weeks, Calctan every 3 months. The most recent releases landed on October 4, 2026 and September 25, 2026 respectively.
| Parameter | Draw | Calctan |
|---|---|---|
| Price | Free | Free |
| Rating | 2.2 (5 ratings) | 4.5 (61 ratings) — better |
| Positive reviews | 25.7% of reviews | 28.6% of reviews — better |
| Number of ratings | 5 | 61 — better |
| Update frequency | Every 6 weeks — better | Every 3 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 6.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 15 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Orgajja Co Ltd | Jorge Lozada |
Customer experience
Draw
Calctan
Bugs and requests
Draw
Reported bugs
10 issues- App crashes frequently during use
- Won't open or start properly
- Saved drawings appear blank or mirrored
- Doesn't work without WiFi/internet connection
- Drawing stops working after clearing screen
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- Ads cause accidental app store redirects
- Flashing ads that could trigger seizures
- App freezes when opening menus
- Lines are not smooth or accurate
- Background images display incorrectly
Requested features
10 requests- Remove or reduce advertisements
- Add erase/undo functionality
- Add more color options (yellow, white)
- Implement reliable save/load feature
- Add help documentation and instructions
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- Improve line smoothness
- Add more pen styles and brushes
- Support offline functionality
- Add back button for navigation
- Portrait orientation support
Calctan
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Draw
- Small DrawPoint$0.99
- Upgrade$1.99
- Big DrawPoint$2.99
Calctan
- No Ads$9.99









