# SF50 TOLD vs Aviator Watch E6B Slide Rule

The clearest difference is price: SF50 TOLD at Free against Aviator Watch E6B Slide Rule's $2.99. Aviator Watch E6B Slide Rule's advantage is iOS requirement (17.0 vs 27.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

SF50 TOLD is free to download; Aviator Watch E6B Slide Rule costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SF50 TOLD ships an update fortnightly, Aviator Watch E6B Slide Rule every 9 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | SF50 TOLD | Aviator Watch E6B Slide Rule |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/sf50-told/id1552835232/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free | — |
| Size | 29 MB | 3 MB |
| Requires iOS | 27.0 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Timothy Morgan](https://appshunter.io/developer/788467418) | [Western Chancellor LLC](https://appshunter.io/developer/6810377018) |

## What reviewers say

### SF50 TOLD

[App page](https://appshunter.io/ios/app/sf50-told/id1552835232)

This application assists Cirrus SF50 Vision pilots in calculating takeoff and landing performance. It allows users to input weights and weather conditions to determine required runway length, supporting various configurations and runway types.

**Highlights:** Takeoff and landing performance calculations, Automatic and manual weather entry, Custom safety factors, Non-normal configuration support, Runway contamination support, Data interpolated from Airplane Flight Manual

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

**In-app purchases:** none


### Aviator Watch E6B Slide Rule

[App page](https://appshunter.io/ios/app/aviator-watch-e6b-slide-rule/id6810376836)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SF50 TOLD free?

SF50 TOLD is free to download, with no in-app purchases.

### Is Aviator Watch E6B Slide Rule free?

Aviator Watch E6B Slide Rule costs $2.99, with no in-app purchases.

### Do SF50 TOLD or Aviator Watch E6B Slide Rule have ads?

Neither SF50 TOLD nor Aviator Watch E6B Slide Rule shows ads.

### Which is updated more often, SF50 TOLD or Aviator Watch E6B Slide Rule?

SF50 TOLD ships an update fortnightly, and Aviator Watch E6B Slide Rule every 9 days. Most recently, SF50 TOLD was updated on November 3, 2026 and Aviator Watch E6B Slide Rule on November 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.*