# Flying Calmly vs Sigma VTC

The clearest difference is in-app purchases: Sigma VTC at none against Flying Calmly's 10. Flying Calmly's advantage is update cadence (every 2 weeks vs monthly) and chart position (#148 vs unranked). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Flying Calmly sells 9 in-app purchases, starting at $6.99 per month. Sigma VTC asks for nothing beyond the download.

Flying Calmly ships an update every 2 weeks, Sigma VTC monthly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Flying Calmly | Sigma VTC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (827 ratings)](https://appshunter.io/ios/app/flying-calmly/id1042610682/reviews)** | — |
| Number of ratings | **827** | — |
| Positive reviews | 95.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#148** | — |
| Size | 6 MB | 94 MB |
| Requires iOS | **16** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Aviles Software](https://appshunter.io/developer/397676103) | [SIGMA VTC](https://appshunter.io/developer/6796301849) |

## What reviewers say

### Flying Calmly

[App page](https://appshunter.io/ios/app/flying-calmly/id1042610682)

**Currently charting:** #148 Top Grossing · Travel (US App Store)

Predict the turbulence on your upcoming flights. Enter your flight details to receive comprehensive reports on potential disturbances and their likelihood. Receive timely updates before you travel, based on public weather data.

**Highlights:** Turbulence forecasting, Flight information input, Scheduled turbulence reports, Weather data analysis, Disturbance strength and likelihood

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flying Calmly Plus | $6.99 | per month |
| Sensors | $0.99 | one-time |
| Small reward | $1.99 | one-time |
| Small reward. | $1.99 | one-time |
| Remove ads | $2.99 | one-time |
| Medium reward | $2.99 | one-time |
| Generous support | $5.99 | one-time |
| Long haul | $6.99 | one-time |
| Generous reward | $6.99 | one-time |

**What reviewers like**

- 🚀 Accurate turbulence forecasting
- 👍 Helpful for anxious flyers
- 🔒 Provides peace of mind
- 📊 Detailed turbulence information
- 🗓️ Tracks turbulence over time

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- ⏱️ Forecast not always updated during flight
- 🗺️ Doesn't account for actual flight path
- 💰 Paid features can be expensive

**Reported bugs**

- Search function not working for some users
- Sensor features not reliable in-flight

**Requested features**

- Text/push notifications for turbulence updates
- Integration with airline apps
- Customizable turbulence alerts
- Offline mode for in-flight use


### Sigma VTC

[App page](https://appshunter.io/ios/app/sigma-vtc/id6796301847)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flying Calmly free?

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

### Is Sigma VTC free?

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

### Do Flying Calmly or Sigma VTC have ads?

Neither Flying Calmly nor Sigma VTC shows ads.

### Which is updated more often, Flying Calmly or Sigma VTC?

Flying Calmly ships an update every 2 weeks, and Sigma VTC monthly. Most recently, Flying Calmly was updated on October 26, 2026 and Sigma VTC on October 24, 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.*