# smartMFD by Guardian Avionics vs Plen

The clearest difference is in-app purchases: Plen at none against smartMFD by Guardian Avionics's 10. Plen also leads on update cadence (every 6 days vs every 3 months). smartMFD by Guardian Avionics's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. smartMFD by Guardian Avionics sells 10 in-app purchases, starting at $0.49 per 7 days. Plen asks for nothing beyond the download.

smartMFD by Guardian Avionics ships an update every 3 months, Plen every 6 days. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | smartMFD by Guardian Avionics | Plen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/smartmfd-by-guardian-avionics/id599071174/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 121 MB | 203 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Co guardian llc](https://appshunter.io/developer/599071177) | [Automata Solutions Ltd.](https://appshunter.io/developer/1520244123) |

## What reviewers say

### smartMFD by Guardian Avionics

[App page](https://appshunter.io/ios/app/smartmfd-by-guardian-avionics/id599071174)

This app transforms your mobile device into a multifunction display for aircraft, showing flight data, engine performance, and navigation charts. It records flight data for later analysis and provides alerts for carbon monoxide levels and pulse oximetry when connected to compatible hardware.

**Highlights:** Multifunction display (MFD), Flight data recording and analysis, Engine performance monitoring, VFR/IFR charts and approach plates, CO level alerts, Pulse oximeter readings

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plan 4 (Weekly) | $0.49 | per 7 days |
| Plan 1 (Monthly) | $9.99 | per month |
| Plan 3 (Monthly) | $12.99 | per month |
| Plan 4 (Monthly) | $24.99 | per month |
| Plan 5 (Monthly) | $29.99 | per month |
| Plan 1 (Yearly) | $99.99 | per year |
| Plan 2 (Yearly) | $149.99 | per year |
| Plan 3 (Yearly) | $199.99 | per year |
| Plan 4 (Yearly) | $249.99 | per year |
| Plan 5 (Yearly) | $299.99 | per year |


### Plen

[App page](https://appshunter.io/ios/app/plen/id6504163423)

Track aircraft in real-time with live location updates. See planes as they fly and monitor weather conditions along their routes. Discover various types of aircraft with this intuitive radar tool.

**Highlights:** Real-time ADS-B tracking, Live aircraft location updates, Weather updates for flight paths, Discover different types of aircraft, Intuitive radar interface

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

**In-app purchases:** none


## Frequently asked questions

### Is smartMFD by Guardian Avionics free?

smartMFD by Guardian Avionics is free to download, with in-app purchases available.

### Is Plen free?

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

### Do smartMFD by Guardian Avionics or Plen have ads?

Neither smartMFD by Guardian Avionics nor Plen shows ads.

### Which is updated more often, smartMFD by Guardian Avionics or Plen?

smartMFD by Guardian Avionics ships an update every 3 months, and Plen every 6 days. Most recently, smartMFD by Guardian Avionics was updated on October 23, 2026 and Plen on October 27, 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.*