# qtVlm vs SailTimer API™

The clearest difference is review sentiment: qtVlm at 79% against SailTimer API™'s 0%. qtVlm also leads on update cadence (weekly vs every 4 weeks) and ratings volume (8 vs 1). SailTimer API™'s advantage is rating (5.0 vs 3.5). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. qtVlm sells 1 one-off in-app purchase and SailTimer API™ sells 6 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

SailTimer API™ holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: qtVlm has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 79% of qtVlm's written reviews are positive against 0% of SailTimer API™'s, so the app with the better star average is not the one people write more warmly about.

qtVlm ships an update weekly, SailTimer API™ every 4 weeks. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | qtVlm | SailTimer API™ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (8 ratings)](https://appshunter.io/ios/app/qtvlm/id999110023/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sailtimer-api/id1562869275/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | **79.2% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 100 MB | 19 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Meltemus SAS](https://appshunter.io/developer/999110022) | [SailTimer Inc.](https://appshunter.io/developer/326309854) |

## What reviewers say

### qtVlm

[App page](https://appshunter.io/ios/app/qtvlm/id999110023)

This navigation software is designed for sailing boats, offering a free version with basic GRIB viewing and an optional full version with advanced weather routing, chart modules, and communication features. It supports various chart formats and NMEA data sources, with a simulation mode for learning.

**Highlights:** GRIB viewer with advanced functions, Weather routing and route modules, Support for Raster, Vector, and MBTiles charts, Harmonic file support for tides and currents, AIS and Iridium GO! communication, Anchor Alarm module, Simulation Mode for learning

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $49.99 | one-time |


### SailTimer API™

[App page](https://appshunter.io/ios/app/sailtimer-api/id1562869275)

This app bridges the gap between your SailTimer Wind Instrument and other navigation or performance apps. It also offers access to crowdsourced wind maps and marine weather animations through a subscription, enhancing your sailing experience with real-time wind data.

**Highlights:** Integrates with SailTimer Wind Instrument, Delivers wind data to partner apps, Crowdsourced wind maps, Marine weather animations, Supports chartplotter apps, Real-time wind data

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Crowdsourced Wind Maps - Monthly | $2.99 | per month |
| WNI Marine Weather - Monthly | $2.99 | per month |
| AI Forecasts - Monthly | $2.99 | per month |
| Crowdsourced Wind Maps - Yearly | $19.99 | per year |
| WNI Marine Weather - Yearly | $19.99 | per year |
| AI Forecasts - Yearly | $19.99 | per year |


## Frequently asked questions

### Is qtVlm free?

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

### Is SailTimer API™ free?

SailTimer API™ is free to download, with in-app purchases available.

### Which has better reviews, qtVlm or SailTimer API™?

SailTimer API™ is rated higher. qtVlm averages 3.5 out of 5 from 8 ratings, while SailTimer API™ averages 5.0 from 1 ratings.

### Do qtVlm or SailTimer API™ have ads?

Neither qtVlm nor SailTimer API™ shows ads.

### Which is updated more often, qtVlm or SailTimer API™?

qtVlm ships an update weekly, and SailTimer API™ every 4 weeks. Most recently, qtVlm was updated on October 14, 2026 and SailTimer API™ on October 1, 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.*