# Millimeter Pro vs DayCalc Pro

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.

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.

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.

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.

## The numbers

| Metric | Millimeter Pro | DayCalc Pro |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | [4.4 (109 ratings)](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777/reviews) | **[4.6 (180 ratings)](https://appshunter.io/ios/app/daycalc-pro-note-calculator/id654444242/reviews)** |
| Number of ratings | 109 | **180** |
| Positive reviews | 57.9% of reviews | **85.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#186** | — |
| Size | 24 MB | 98 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [良峰 侯](https://appshunter.io/developer/654444245) |

## What reviewers say

### Millimeter Pro

[App page](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777)

**Currently charting:** #186 Top Paid · Utilities (US App Store)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### DayCalc Pro

[App page](https://appshunter.io/ios/app/daycalc-pro-note-calculator/id654444242)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Constants Pack | $0.99 | one-time |
| Festivals Theme Pack 1 | $0.99 | one-time |
| Season Theme Pack 1 | $0.99 | one-time |
| Bird Theme Pack 1 | $0.99 | one-time |
| Insects Theme Pack 1 | $0.99 | one-time |
| Season Theme Pack 2 | $0.99 | one-time |
| Festivals Theme Pack 2 | $0.99 | one-time |
| Custom Unit Pack | $1.99 | one-time |
| Complete Pack | $4.99 | one-time |

**What reviewers like**

- 👍 Easy to use and intuitive interface
- 🎨 Customizable themes and colors
- 📊 Comprehensive feature set (scientific, fractions, conversions)
- 💰 Great value for price (free or $1)
- 📝 Useful history/tape feature for tracking calculations

**What reviewers complain about**

- 🐛 Update installation issues and stuck downloads
- 🐛 Display cutoff in landscape mode on smaller phones
- 🐛 Fraction display cuts off large numbers
- 🐛 Currency converter fails after favoriting
- 🐛 Copy function only copies first number

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*