# Mudflap vs DEF Search

The clearest difference is ratings volume: Mudflap at 4.6K against DEF Search's 1. Mudflap also leads on chart position (#49 vs unranked). DEF Search's advantage is rating (5.0 vs 4.8) and monetization model (free vs ad-supported). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DEF Search holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Mudflap has 4.6K ratings behind it against 1, so its average is the more settled of the two.

Mudflap ships an update every 2 weeks, DEF Search every 9 days. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Mudflap | DEF Search |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4.6K ratings)](https://appshunter.io/ios/app/mudflap/id1488815024/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/def-search/id6746346949/reviews)** |
| Number of ratings | **4.6K** | 1 |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Ad-supported | **Free** |
| Best chart rank | **#49** | — |
| Size | 168 MB | 7 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mudflap Inc](https://appshunter.io/developer/1488815023) | [David Brownlow](https://appshunter.io/developer/1816264329) |

## What reviewers say

### Mudflap

[App page](https://appshunter.io/ios/app/mudflap/id1488815024)

**Currently charting:** #49 Top Free · Navigation (US App Store)

Save on diesel fuel at over 2,800 truck stops nationwide with instant discounts. Access free, truck-safe GPS navigation that avoids low bridges and weight restrictions. Simply link your card to start saving.

**Highlights:** Instant diesel discounts, 2,800+ truck stop locations, Free truck-safe GPS navigation, Avoids low bridges and weight limits, Debit/credit card integration, No credit checks or waiting periods

**Features:** Apple Wallet

**In-app purchases:** none

**What reviewers like**

- 💰 Significant fuel savings
- 🔍 Convenient fuel price comparison
- ⚡ Easy to use app
- 🤝 Helpful customer support
- 🌟 Great app overall

**What reviewers complain about**

- ⏳ Lengthy account verification process
- 💳 Long hold times on payment cards
- 🚫 Limited participating fuel stations
- 🤔 Unclear policies and requirements

**Reported bugs**

- Inconsistent discount amounts
- Unexpected account deactivations

**Requested features**

- Expand fuel station network
- Faster account verification
- More transparent policies
- Improved payment processing


### DEF Search

[App page](https://appshunter.io/ios/app/def-search/id6746346949)

Easily locate Diesel Exhaust Fluid (DEF) pumps nearby with an interactive map. Get directions, confirm station status, and contribute to keeping data accurate for all diesel vehicle owners.

**Highlights:** Interactive DEF pump locator map, Search by address, city, or ZIP code, Use current location for closest pump, One-tap directions via Apple/Google Maps, Confirm station status, Report/suggest station updates, Save favorite stations

**In-app purchases:** none


## Frequently asked questions

### Is Mudflap free?

Mudflap is free to download, with no in-app purchases.

### Is DEF Search free?

DEF Search is free to download, with no in-app purchases.

### Which has better reviews, Mudflap or DEF Search?

DEF Search is rated higher. Mudflap averages 4.8 out of 5 from 4.6K ratings, while DEF Search averages 5.0 from 1 ratings.

### Do Mudflap or DEF Search have ads?

Neither Mudflap nor DEF Search shows ads.

### Which is updated more often, Mudflap or DEF Search?

Mudflap ships an update every 2 weeks, and DEF Search every 9 days. Most recently, Mudflap was updated on October 14, 2026 and DEF Search on October 6, 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.*