# iSlipstick RF vs Flightlogbackup

The clearest difference is in-app purchases: iSlipstick RF at none against Flightlogbackup's 4. Flightlogbackup's advantage is update cadence (every 6 weeks vs every 10 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Flightlogbackup sells 4 in-app purchases, starting at $3.99 per month. iSlipstick RF asks for nothing beyond the download.

iSlipstick RF ships an update every 10 months, Flightlogbackup every 6 weeks. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | iSlipstick RF | Flightlogbackup |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/islipstick-rf/id351775311/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 43 MB | 86 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sam Virgillo](https://appshunter.io/developer/324560825) | [FlightlogBackup](https://appshunter.io/developer/506315406) |

## What reviewers say

### iSlipstick RF

[App page](https://appshunter.io/ios/app/islipstick-rf/id351775311)

This app provides a comprehensive suite of calculators and converters specifically designed for radio frequency (RF) engineers and technicians. It includes tools for path loss, antenna gain, intermodulation, and standard electrical calculations, along with various unit conversions.

**Highlights:** RF-specific calculators, Standard electrical calculators, Unit converters, Path loss calculation, Intermodulation analysis, Antenna gain and beamwidth

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

**In-app purchases:** none


### Flightlogbackup

[App page](https://appshunter.io/ios/app/flightlogbackup-flb/id6756682142)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FLB Technician Premiuim | $3.99 | per month |
| FLB Technician Premiuim | $4.99 | per month |
| FLB Technician Premiuim | $29.99 | per year |
| FLB Pilot Premium | $39.99 | per year |


## Frequently asked questions

### Is iSlipstick RF free?

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

### Is Flightlogbackup free?

Flightlogbackup is free to download, with in-app purchases available.

### Do iSlipstick RF or Flightlogbackup have ads?

Neither iSlipstick RF nor Flightlogbackup shows ads.

### Which is updated more often, iSlipstick RF or Flightlogbackup?

iSlipstick RF ships an update every 10 months, and Flightlogbackup every 6 weeks. Most recently, iSlipstick RF was updated on October 16, 2026 and Flightlogbackup on October 4, 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.*