# SeeLeveL Sync vs Blue Def Decoder

The clearest difference is review sentiment: Blue Def Decoder at 60% against SeeLeveL Sync's 0%. Blue Def Decoder also leads on rating (3.0 vs 2.4) and chart position (#173 vs unranked). SeeLeveL Sync's advantage is price (Free vs $3.99) and update cadence (every 2 months vs every 5 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

SeeLeveL Sync is free to download; Blue Def Decoder costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Blue Def Decoder holds the better App Store score, 3.0 against 2.4. Both are backed by a comparable volume of ratings — 5 and 6 respectively. Written reviews point the same way: 0% of SeeLeveL Sync's written reviews are positive against 60% of Blue Def Decoder's.

SeeLeveL Sync ships an update every 2 months, Blue Def Decoder every 5 months. The most recent releases landed on October 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | SeeLeveL Sync | Blue Def Decoder |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [2.4 (5 ratings)](https://appshunter.io/ios/app/seelevel-sync/id6451456679/reviews) | **[3.0 (6 ratings)](https://appshunter.io/ios/app/blue-def-decoder/id6751862301/reviews)** |
| Number of ratings | 5 | **6** |
| Positive reviews | 0.0% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#173** |
| Size | 25 MB | 20 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Garnet Instruments Ltd.](https://appshunter.io/developer/1148117796) | [Mako Technology Labs](https://appshunter.io/developer/1832176903) |

## What reviewers say

### SeeLeveL Sync

[App page](https://appshunter.io/ios/app/seelevel-sync/id6451456679)

Monitor your RV's fresh water, grey water, black water, and LPG tank levels in real-time. Customize tank names, colors, and set alarms for low or high levels. Connects via Bluetooth to compatible SeeLeveL II tank monitors.

**Highlights:** Real-time tank level monitoring, Customizable tank names and colors, Low and high level tank alarms, Bluetooth connectivity, Graphical and percentage display, Home Screen widget support

**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:** #173 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 SeeLeveL Sync free?

SeeLeveL Sync is free to download, 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, SeeLeveL Sync or Blue Def Decoder?

Blue Def Decoder is rated higher. SeeLeveL Sync averages 2.4 out of 5 from 5 ratings, while Blue Def Decoder averages 3.0 from 6 ratings.

### Do SeeLeveL Sync or Blue Def Decoder have ads?

Neither SeeLeveL Sync nor Blue Def Decoder shows ads.

### Which is updated more often, SeeLeveL Sync or Blue Def Decoder?

SeeLeveL Sync ships an update every 2 months, and Blue Def Decoder every 5 months. Most recently, SeeLeveL Sync was updated on October 9, 2026 and Blue Def Decoder on September 23, 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.*