# Sail Trails vs Simple Calculator

The clearest difference is in-app purchases: Sail Trails at none against Simple Calculator's 2. Sail Trails also leads on ads (none vs shown) and iOS requirement (13.1 vs 15.0). Simple Calculator's advantage is update cadence (every 3 weeks vs every 5 months). On price and device support there is nothing between them.

Both are free to download. Simple Calculator sells 2 one-off in-app purchases. Sail Trails asks for nothing beyond the download.

Sail Trails ships an update every 5 months, Simple Calculator every 3 weeks. The most recent releases landed on October 5, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Sail Trails | Simple Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 75 MB | 9 MB |
| Requires iOS | **13.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Two* States* Away*](https://appshunter.io/developer/379800400) | [Takao Ichimura](https://appshunter.io/developer/1474061593) |

## What reviewers say

### Sail Trails

[App page](https://appshunter.io/ios/app/sail-trails/id1581317739)

**Features:** macOS Compatibility

**In-app purchases:** none


### Simple Calculator

[App page](https://appshunter.io/ios/app/simple-calculator-practicalc/id6760546131)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Remove Ads + Support | $2.99 | one-time |


## Frequently asked questions

### Is Sail Trails free?

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

### Is Simple Calculator free?

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

### Do Sail Trails or Simple Calculator have ads?

Simple Calculator shows ads; Sail Trails does not.

### Which is updated more often, Sail Trails or Simple Calculator?

Sail Trails ships an update every 5 months, and Simple Calculator every 3 weeks. Most recently, Sail Trails was updated on October 5, 2026 and Simple Calculator on September 20, 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.*