# TideMeasure vs IODA Optimist

The clearest difference is price: IODA Optimist at Free against TideMeasure's $19.99. IODA Optimist also leads on iOS requirement (11.0 vs 17.0). TideMeasure's advantage is chart position (#33 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

IODA Optimist is free to download; TideMeasure 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 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | TideMeasure | IODA Optimist |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tidemeasure-sea-current/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 | **#33** | — |
| 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

### TideMeasure

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

**Currently charting:** #33 Top Paid · Sports (US App Store)

Measure sea current speed and direction using your iPhone's GPS. Ideal for sailors, coaches, and race teams to map readings, review history, and share data for tactical advantage. Works offline.

**Highlights:** Measure current speed and direction with GPS, View results in multiple units (m/min, m/s, cm/s, knots), Map measurements across race areas, Review saved measurements and history, Create or join teams to share readings, Export measurements as CSV, Offline measurement capability

**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 TideMeasure free?

TideMeasure costs $19.99, with no in-app purchases.

### Is IODA Optimist free?

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

### Do TideMeasure or IODA Optimist have ads?

Neither TideMeasure nor IODA Optimist shows ads.

### Which is updated more often, TideMeasure or IODA Optimist?

TideMeasure ships an update every 2 months, and IODA Optimist every 2 months. Most recently, TideMeasure was updated on October 30, 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.*