# PredictCurrent vs Slackwater

The clearest difference is rating: Slackwater at 5.0 against PredictCurrent's 4.5. Slackwater also leads on in-app purchases (none vs 5). PredictCurrent's advantage is ratings volume (268 vs 1) and chart position (#94 vs unranked). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. PredictCurrent sells 5 in-app purchases, starting at $15.00 per month. Slackwater asks for nothing beyond the download.

Slackwater holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: PredictCurrent has 268 ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | PredictCurrent | Slackwater |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (268 ratings)](https://appshunter.io/ios/app/predictcurrent/id6468610449/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/slackwater-tides-and-current/id6813654837/reviews)** |
| Number of ratings | **268** | 1 |
| Positive reviews | 56.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#94** | — |
| Size | 50 MB | 53 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone, iPad | **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

### PredictCurrent

[App page](https://appshunter.io/ios/app/predictcurrent/id6468610449)

**Currently charting:** #94 Top Grossing · Weather (US App Store)

Navigate coastal waters with detailed tidal and ocean current maps. Access 10-day forecasts for currents, wind, waves, and sea temperatures. Essential for safe marine planning and exploration.

**Highlights:** Ultra-high-resolution 100m tidal current maps, 400m and 4km global coastline coverage, 10-day animated forecasts for currents, wind, and waves, Hourly tide chart data, Wind-against-current interaction analysis, Sea temperature tracking

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PredictCurrent Pro 1-Month | $15.00 | per month |
| PredictCurrent Pro 3-Monthly | $29.00 | per 3 months |
| PredictCurrent Pro 3-Monthly | $29.00 | per 3 months |
| PredictCurrent Pro 3-Monthly | $29.00 | per 3 months |
| PredictCurrent Pro Annual | $99.00 | per year |

**What reviewers like**

- 📊 Detailed hour-by-hour current visualizations
- 🎯 Accurate tidal and current predictions
- 👍 Intuitive and user-friendly interface
- 🌊 Comprehensive water condition data (wind, tide, waves, temperature)
- 💼 Valuable competitive advantage for water sports professionals

**What reviewers complain about**

- 💰 Expensive subscription pricing ($24-30 quarterly)
- 🚫 Mandatory account creation required
- 📍 Limited geographic coverage and location availability
- ⏰ Forecast data limited to short timeframes (until 11am-noon next day)
- 🔐 Privacy concerns regarding personal data collection

**Reported bugs**

- Unable to add location error messages despite valid coordinates
- Location setup fails to respond or complete
- Password not saved correctly in database, preventing login
- Account creation fails with character handling errors
- App crashes when setting locations

**Requested features**

- Extended forecast data for full 24-hour next day coverage
- Smaller time increment stepping (sub-hourly) for racing
- Exact tide turn time information beyond hourly data
- Legend/symbol guide for app indicators
- Improved coastal and estuarine modeling


### 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 PredictCurrent free?

PredictCurrent 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, PredictCurrent or Slackwater?

Slackwater is rated higher. PredictCurrent averages 4.5 out of 5 from 268 ratings, while Slackwater averages 5.0 from 1 ratings.

### Do PredictCurrent or Slackwater have ads?

Neither PredictCurrent 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.*