# PredictWind vs Slackwater

The clearest difference is in-app purchases: Slackwater at none against PredictWind's 10. Slackwater also leads on rating (5.0 vs 4.8). PredictWind's advantage is ratings volume (33K vs 1) and chart position (#21 vs unranked). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. PredictWind sells 10 in-app purchases, starting at $6.99 per month. Slackwater asks for nothing beyond the download.

Slackwater holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: PredictWind has 33K ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | PredictWind | Slackwater |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (33K ratings)](https://appshunter.io/ios/app/predictwind-marine-forecasts/id477048487/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/slackwater-tides-and-current/id6813654837/reviews)** |
| Number of ratings | **33K** | 1 |
| Positive reviews | 84.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#21** | — |
| Size | 50 MB | 53 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [PredictWind Limited](https://appshunter.io/developer/477048590) | [Open Water Software LLC](https://appshunter.io/developer/1887683238) |

## What reviewers say

### PredictWind

[App page](https://appshunter.io/ios/app/predictwind-marine-forecasts/id477048487)

**Currently charting:** #21 Top Grossing · Weather, #51 Top Free · Weather (US App Store)

Access highly accurate marine weather forecasts and advanced tools for wind, waves, and currents. Plan your voyages, optimize routes, and stay informed with real-time data and alerts for safer and more enjoyable time on the water.

**Highlights:** Accurate marine weather forecasts, Wind, wave, and current data, Weather Routing for optimal routes, Departure Planning summaries, High-resolution forecast maps, Live wind observations and webcams, Weather alerts

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic - Monthly | $6.99 | per month |
| Basic - 3 Monthly | $12.00 | per 3 months |
| Basic - Annual | $29.00 | per year |
| Standard - Monthly | $49.00 | per month |
| Standard - 3 Monthly | $99.00 | per 3 months |
| Professional - Monthly | $99.00 | per month |
| Standard - 3 Monthly | $99.00 | per 3 months |
| Standard - Annual | $249.00 | per year |
| Professional - 3 Monthly | $249.00 | per 3 months |
| Professional - Annual | $499.00 | per year |

**What reviewers like**

- 👍 Accurate weather forecasts
- 🚀 Comprehensive data and features
- 💡 Useful for sailing, fishing, and other outdoor activities
- 👍 Easy to use and navigate
- 🚀 Reliable and dependable

**What reviewers complain about**

- 🐛 Occasional inaccuracies in weather predictions
- 💰 Expensive subscription costs
- 🔒 Difficult to cancel subscription
- 🔒 Locked into using proprietary hardware and services
- 🔒 Limited free features

**Reported bugs**

- App crashes or freezes on some devices
- Inconsistent performance across different locations
- Subscription issues and billing problems

**Requested features**

- Improved integration with other apps and charts
- More frequent weather model updates
- Earlier weather forecast updates
- Ability to customize alert settings
- Improved offline functionality


### Slackwater

[App page](https://appshunter.io/ios/app/slackwater-tides-and-current/id6813654837)

Access tide and current data for thousands of stations worldwide, even without an internet connection. View predictions for rising/falling tides, slack times, and current speeds and directions. Includes sunrise, sunset, and moon phase information.

**Highlights:** Offline tide and current data, 4,700+ tide stations worldwide, Currents across US and Canada, Sunrise, sunset, and moon phase, Apple Watch app, Home screen widgets, Siri integration

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

**In-app purchases:** none


## Frequently asked questions

### Is PredictWind free?

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

### Is Slackwater free?

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

### Which has better reviews, PredictWind or Slackwater?

Slackwater is rated higher. PredictWind averages 4.8 out of 5 from 33K ratings, while Slackwater averages 5.0 from 1 ratings.

### Do PredictWind or Slackwater have ads?

Neither PredictWind nor Slackwater shows ads.

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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.*