# SailboatData vs TetraScience

The clearest difference is in-app purchases: TetraScience at none against SailboatData's 4. TetraScience also leads on update cadence (every 9 days vs every 4 weeks) and iOS requirement (13.4 vs 15.5). On price, ads and device support there is nothing between them.

Both are free to download. SailboatData sells 4 in-app purchases, starting at $0.99 per month. TetraScience asks for nothing beyond the download.

SailboatData ships an update every 4 weeks, TetraScience every 9 days. The most recent releases landed on September 24, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | SailboatData | TetraScience |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (293 ratings)](https://appshunter.io/ios/app/sailboatdata/id1545197438/reviews)** | — |
| Number of ratings | **293** | — |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 105 MB |
| Requires iOS | 15.5 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VMG Media, LLC](https://appshunter.io/developer/1545197440) | [TetraScience Inc.](https://appshunter.io/developer/1097870183) |

## What reviewers say

### SailboatData

[App page](https://appshunter.io/ios/app/sailboatdata/id1545197438)

Access a comprehensive database of production sailboat specifications offline. Compare models, search by detailed criteria, and save favorites with personal remarks. Ideal for buyers and marine professionals alike.

**Highlights:** Offline sailboat database access, Side-by-side model comparison, Search by detailed specifications, Save favorite sailboats and designers, Add personal remarks to models, Sync favorites and remarks via iCloud

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Monthly Access | $0.99 | per month |
| 3 Monthly Access | $1.99 | per 3 months |
| 6 Monthly Access | $2.99 | per 6 months |
| 12 Monthly Access | $3.99 | per year |


### TetraScience

[App page](https://appshunter.io/ios/app/tetrascience/id6636511009)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SailboatData free?

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

### Is TetraScience free?

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

### Do SailboatData or TetraScience have ads?

Neither SailboatData nor TetraScience shows ads.

### Which is updated more often, SailboatData or TetraScience?

SailboatData ships an update every 4 weeks, and TetraScience every 9 days. Most recently, SailboatData was updated on September 24, 2026 and TetraScience on May 17, 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.*