# Sea Current Measure Tool vs IODA Optimist

The clearest difference is price: IODA Optimist at Free against Sea Current Measure Tool's $19.99. IODA Optimist also leads on iOS requirement (11.0 vs 17.0). Sea Current Measure Tool's advantage is chart position (#79 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

IODA Optimist is free to download; Sea Current Measure Tool costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 27, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Sea Current Measure Tool | IODA Optimist |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sea-current-measure-tool/id6448216978/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | — |
| Best chart rank | **#79** | — |
| Size | 14 MB | 67 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Master Sailing jdoo](https://appshunter.io/developer/1680451361) | [Sailti](https://appshunter.io/developer/960712124) |

## What reviewers say

### Sea Current Measure Tool

[App page](https://appshunter.io/ios/app/sea-current-measure-tool/id6448216978)

**Currently charting:** #79 Top Paid · Sports (US App Store)

This tool helps sailors and coaches measure sea current speed and direction directly on the water using an iPhone. It's designed for race preparation and training, using GPS data to calculate water movement from a floating object.

**Highlights:** Measure sea current speed and direction, GPS-based current calculation, Simple start and stop measurement, Store and review measurements, Display measurements on map, Useful for race preparation and training

**Features:** Vision Pro support

**In-app purchases:** none


### IODA Optimist

[App page](https://appshunter.io/ios/app/ioda-optimist/id6504682148)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sea Current Measure Tool free?

Sea Current Measure Tool costs $19.99, with no in-app purchases.

### Is IODA Optimist free?

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

### Do Sea Current Measure Tool or IODA Optimist have ads?

Neither Sea Current Measure Tool nor IODA Optimist shows ads.

### Which is updated more often, Sea Current Measure Tool or IODA Optimist?

Sea Current Measure Tool ships an update every 2 months, and IODA Optimist every 2 months. Most recently, Sea Current Measure Tool was updated on October 27, 2026 and IODA Optimist on October 5, 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.*