Comparison

Millimeter Pro vs Calctan

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Millimeter Pro

This app transforms your device into a versatile measuring tool. It allows for precise measurements of length, area, diameter, and angles using the touchscreen. Easily split objects into equal parts and switch between millimeters and inches for your convenience.

Highlights
  • Touchscreen ruler and tape measure
  • Measure length, area, diameter, and angles
  • Split objects into equal parts
  • Supports millimeters and inches
  • Estimate radius
  • Thread pitch gauge
Features
Read full description

App blog: https://goo.gl/da6LdZ Millimeter Pro is an easy-to-use and helpful measurement tool for iPhone or iPad. It uses a touch screen as a ruler or tape measure to make quick measurements, split objects into equal parts, measure object ratio (W/H), measure area, estimate diameter and angles, and split circular objects into equal parts. Place an object on the screen and simply touch and move rulers to measure it. You can measure in different units: MILLIMETERS or INCHES. Features: - mm and inch units - 2D measurements: vertical and horizontal rulers - area calculation - ratio calculation (W/H) - split linear and circular objects into equal parts - shows the length and angle of each part - disable/enable touch screen (freeze feature) - diameter or radius estimation - angle measure with Protractor / Goniometer mode - Thread pitch gauge for TPI and pitch size measurements Use this app in different areas to measure small objects that fit within your phone or tablet screen: jewelry, rings, stones, gem, beads, screws, bolts, buttons, nuts, knitting needles, knitting patterns, washers, insects, mosaic tile, hooks, frame wrap angle, etc. Enjoy the app and Thank you for your interest and support! VisTech.Projects Team

About

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.

Highlights
  • 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
Features
Read full description

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

Millimeter Pro4 screens
Calctan4 screens

Verdict

The call

The clearest difference is price: Calctan at Free against Millimeter Pro's $3.99. Millimeter Pro's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating, ratings volume, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Calctan is free to download; Millimeter Pro costs $3.99 up front. Calctan sells 1 one-off in-app purchase. Millimeter Pro asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Millimeter Pro against 4.5 for Calctan. Both are backed by a comparable volume of ratings — 109 and 61 respectively. Written reviews are what separate them: 58% of Millimeter Pro's written reviews are positive against 29% of Calctan's.

UpkeepUpdate frequency

Millimeter Pro ships an update every 4 months, Calctan every 3 months. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
Millimeter Pro versus Calctan: the parameters behind the verdict, then further details
ParameterMillimeter ProCalctan
Price$3.99Free — better
Rating4.4 (109 ratings)4.5 (61 ratings) — better
Positive reviews57.9% of reviews — better28.6% of reviews
Number of ratings109 — better61
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.6
Further details — not scored
Size24 MB11 MB
Age rating4+4+
DeveloperVisTech.Projects LLCJorge Lozada

Customer experience

Millimeter Pro

All ratings108 ratings
Positive85.2%
Neutral3.7%
Negative11.1%
Written reviews38 reviews
Positive57.9%
Neutral5.3%
Negative36.8%

Calctan

All ratings61 ratings
Positive88.5%
Neutral0.0%
Negative11.5%
Written reviews7 reviews
Positive28.6%
Neutral0.0%
Negative71.4%

In-app purchases

None

Millimeter Pro

No in-app purchases

1 purchases

Calctan

One-time1
  • No Ads$9.99

Questions

Is Millimeter Pro free?
Millimeter Pro costs $3.99, with no in-app purchases.
Is Calctan free?
Calctan is free to download, with in-app purchases available.
Which has better reviews, Millimeter Pro or Calctan?
Calctan is rated higher. Millimeter Pro averages 4.4 out of 5 from 109 ratings, while Calctan averages 4.5 from 61 ratings.
Do Millimeter Pro or Calctan have ads?
Calctan shows ads; Millimeter Pro does not.
Which is updated more often, Millimeter Pro or Calctan?
Millimeter Pro ships an update every 4 months, and Calctan every 3 months. Most recently, Millimeter Pro was updated on October 20, 2026 and Calctan on October 24, 2026.

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