Comparison

Millimeter Pro vs DayCalc Pro

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
Currently charting
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

DayCalc Pro

This app combines a powerful calculator with a comprehensive unit converter. It offers standard and scientific calculations, allows notes to be added to history, and supports a wide range of units and custom conversions. Enjoy a user-friendly interface with customizable themes and watchOS integration.

Highlights
  • Standard and scientific calculator
  • Add notes to calculations
  • Over 600 units in 20 categories
  • Custom unit creation
  • Automatic currency exchange rate updates
  • Dark Mode support
  • Apple Watch integration
Features
Read full description

DayCalc is an easy to use, beautifully packaged calculator and Unit Converter, includes standard, scientific and fractions calculator, best calculator for your iPad, iPhone and Apple Watch! Calculator: - Live voice calculator - Add notes to history of your calculations, and you can share - Choose between a basic calculator or scientific calculator with more than 30 scientific operations - Use both calculators in portrait or landscape mode (both iPhone and iPad), and split screen support for iPad - Auto adjust height of the history list, no matter how long the calculation process can be displayed in full - Allows locking of calculation history, cannot be deleted and modified after locking - Full watchOS 4 and later support - Support iOS 9 and later spotlight search - Support Dark Mode Unit Converter: - Over 600+ units in 20 categories. - Allows you to add your own unit data, make your own unit converter that meets all your requirements. - Support more than 150 kinds of currency, conversion exchange rate automatic updates - The simplest way to create and use favorite lists. - Add the constant value of your frequently used, it can easily and quickly reused. - Flexible search feature that lets you quickly find what you want the unit and automatically saves your search history. Basic functions: - 50+ beautiful themes for you to choose - View and edit a history of your calculations on the History Panel - Multiple Button sounds, and button sound is mutable URL schemes: HCDayCalcPro:// Download it now and feel of this calculator is how classic

Screenshots

Millimeter Pro4 screens
DayCalc Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: Millimeter Pro at none against DayCalc Pro's 9. Millimeter Pro also leads on chart position (#186 vs unranked). DayCalc Pro's advantage is review sentiment (86% vs 58%) and rating (4.6 vs 4.4). On ratings volume, ads, device support and iOS requirement 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

Millimeter Pro costs $3.99 and DayCalc Pro $0.99 up front. DayCalc Pro sells 9 one-off in-app purchases. Millimeter Pro asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

DayCalc Pro holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 109 and 180 respectively. Written reviews point the same way: 58% of Millimeter Pro's written reviews are positive against 86% of DayCalc Pro's.

UpkeepUpdate frequency

Millimeter Pro ships an update every 4 months, DayCalc Pro every 6 weeks. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard7 real differences · 4 level
Millimeter Pro versus DayCalc Pro: the parameters behind the verdict, then further details
ParameterMillimeter ProDayCalc Pro
Price$3.99$0.99 — better
Rating4.4 (109 ratings)4.6 (180 ratings) — better
Positive reviews57.9% of reviews85.6% of reviews — better
Number of ratings109180 — better
Update frequencyEvery 4 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#186 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS15.015.0
Further details — not scored
Size24 MB98 MB
Age rating4+4+
DeveloperVisTech.Projects LLC良峰 侯

Customer experience

Millimeter Pro

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

DayCalc Pro

All ratings177 ratings
Positive92.7%
Neutral2.8%
Negative4.5%
Written reviews174 reviews
Positive85.6%
Neutral5.2%
Negative9.2%

Bugs and requests

Millimeter Pro

Not enough reviews yet to summarise bugs or requests.

DayCalc Pro

Reported bugs

10 issues
  • Latest update stuck on download/installation loop
  • Display rendering issues in landscape mode on iPhone 12/13 mini
  • Fraction results display truncated with large numbers
  • Fraction operator placement incorrect during multi-step calculations
  • Currency conversion broken after favoriting currencies
Show 5 more
  • Copy expression only copies first number
  • Exponent calculation: .35 / 1 EE 6 returns 350,000 instead of correct value
  • Fahrenheit to Celsius conversion inaccurate (8°F returns 1.3°C)
  • App becomes unusable after using unit conversion feature
  • iOS 6 compatibility: black display and crashes

Requested features

5 requests
  • Cursor movement for easier digit and symbol editing
  • Back button to delete individual numbers instead of clearing all
  • History display directly above input without clicking
  • Back button in converter functions for easier navigation
  • Improved animated transitions for better aesthetics

In-app purchases

None

Millimeter Pro

No in-app purchases

9 purchases

DayCalc Pro

One-time9
  • Constants Pack$0.99
  • Festivals Theme Pack 1$0.99
  • Season Theme Pack 1$0.99
Show 6 more
  • Bird Theme Pack 1$0.99
  • Insects Theme Pack 1$0.99
  • Season Theme Pack 2$0.99
  • Festivals Theme Pack 2$0.99
  • Custom Unit Pack$1.99
  • Complete Pack$4.99

Questions

Is Millimeter Pro free?
Millimeter Pro costs $3.99, with no in-app purchases.
Is DayCalc Pro free?
DayCalc Pro costs $0.99, and also offers in-app purchases.
Which has better reviews, Millimeter Pro or DayCalc Pro?
DayCalc Pro is rated higher. Millimeter Pro averages 4.4 out of 5 from 109 ratings, while DayCalc Pro averages 4.6 from 180 ratings.
Do Millimeter Pro or DayCalc Pro have ads?
Neither Millimeter Pro nor DayCalc Pro shows ads.
Which is updated more often, Millimeter Pro or DayCalc Pro?
Millimeter Pro ships an update every 4 months, and DayCalc Pro every 6 weeks. Most recently, Millimeter Pro was updated on October 24, 2026 and DayCalc Pro on October 26, 2026.

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