# SSFMfree vs Trigonometric Calculation

The clearest difference is update cadence: Trigonometric Calculation at every 6 weeks against SSFMfree's every 11 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SSFMfree ships an update every 11 months, Trigonometric Calculation every 6 weeks. The most recent releases landed on February 21, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | SSFMfree | Trigonometric Calculation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 11 months | **Every 6 weeks** |
| Size | 11 MB | 5 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [sigeyosi kanenishi](https://appshunter.io/developer/629958778) | [Risako Asai](https://appshunter.io/developer/1671273580) |

## What reviewers say

### SSFMfree

[App page](https://appshunter.io/ios/app/ssfmfree/id1476228180)

**Features:** macOS Compatibility

**In-app purchases:** none


### Trigonometric Calculation

[App page](https://appshunter.io/ios/app/trigonometric-calculation/id1636196284)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SSFMfree free?

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

### Is Trigonometric Calculation free?

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

### Do SSFMfree or Trigonometric Calculation have ads?

Both SSFMfree and Trigonometric Calculation show ads.

### Which is updated more often, SSFMfree or Trigonometric Calculation?

SSFMfree ships an update every 11 months, and Trigonometric Calculation every 6 weeks. Most recently, SSFMfree was updated on February 21, 2026 and Trigonometric Calculation on May 16, 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.*