# Millimeters to Inches vs Blue Def Decoder

Millimeters to Inches and Blue Def Decoder both sit at 3.0 stars, but that hides the real split: 60% of Blue Def Decoder's written reviews are positive against 0% of Millimeters to Inches's. Blue Def Decoder also leads on chart position (#192 vs unranked) and update cadence (every 5 months vs every 10 months). Millimeters to Inches's advantage is price ($0.99 vs $3.99) and iOS requirement (12.0 vs 15.1). On rating, ads, in-app purchases and monetization model there is nothing between them.

Millimeters to Inches costs $0.99 and Blue Def Decoder $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 3.0 for Millimeters to Inches against 3.0 for Blue Def Decoder. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews are what separate them: 0% of Millimeters to Inches's written reviews are positive against 60% of Blue Def Decoder's.

Millimeters to Inches ships an update every 10 months, Blue Def Decoder every 5 months. Both last shipped on October 9, 2026.

## The numbers

| Metric | Millimeters to Inches | Blue Def Decoder |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/millimeters-to-inches/id1064629196/reviews) | [3.0 (6 ratings)](https://appshunter.io/ios/app/blue-def-decoder/id6751862301/reviews) |
| Number of ratings | 2 | **6** |
| Positive reviews | 0.0% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 5 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#192** |
| Size | 7 MB | 20 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Pelster](https://appshunter.io/developer/429002805) | [Mako Technology Labs](https://appshunter.io/developer/1832176903) |

## What reviewers say

### Millimeters to Inches

[App page](https://appshunter.io/ios/app/millimeters-to-inches/id1064629196)

Easily convert measurements between millimeters and inches in either direction. This utility app is straightforward to use, requires no internet connection, and offers a clean, ad-free experience.

**Highlights:** Millimeter to Inch conversion, Inch to Millimeter conversion, Easy to use interface, Offline functionality, No ads, No in-app purchases

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Blue Def Decoder

[App page](https://appshunter.io/ios/app/blue-def-decoder/id6751862301)

**Currently charting:** #192 Top Paid · Utilities (US App Store)

Instantly determine the freshness of your Diesel Exhaust Fluid (DEF) by entering the code from your container. This app helps you confirm DEF hasn't expired, track shelf life, and verify vehicle compliance, removing guesswork for diesel vehicle owners.

**Highlights:** Check DEF freshness, Enter 5-11 character codes, View manufacturing date, See freshness status, Track shelf life, Verify vehicle compliance

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Millimeters to Inches free?

Millimeters to Inches costs $0.99, with no in-app purchases.

### Is Blue Def Decoder free?

Blue Def Decoder costs $3.99, with no in-app purchases.

### Which has better reviews, Millimeters to Inches or Blue Def Decoder?

Millimeters to Inches and Blue Def Decoder are both rated 3.0 out of 5 on the App Store, from 2 and 6 ratings respectively.

### Do Millimeters to Inches or Blue Def Decoder have ads?

Neither Millimeters to Inches nor Blue Def Decoder shows ads.

### Which is updated more often, Millimeters to Inches or Blue Def Decoder?

Millimeters to Inches ships an update every 10 months, and Blue Def Decoder every 5 months. Most recently, Millimeters to Inches was updated on October 9, 2026 and Blue Def Decoder on October 9, 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.*