# iSlipstick vs Metis OS

The clearest difference is update cadence: Metis OS at fortnightly against iSlipstick's every 3 months. iSlipstick's advantage is iOS requirement (12.0 vs 16.0). 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.

iSlipstick ships an update every 3 months, Metis OS fortnightly. The most recent releases landed on October 31, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | iSlipstick | Metis OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/islipstick/id324560822/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 36 MB | 1 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sam Virgillo](https://appshunter.io/developer/324560825) | [Christian Daniel Johnson](https://appshunter.io/developer/1759691186) |

## What reviewers say

### iSlipstick

[App page](https://appshunter.io/ios/app/islipstick/id324560822)

This app provides a suite of essential electronic formula calculators and unit converters. It simplifies complex calculations for Ohm's law, LC circuits, impedance, and more, with a user-friendly interface for quick input and reordering of frequently used tools.

**Highlights:** Ohm's law calculator, Op-Amp gain calculator, LC circuit resonance calculator, RLC circuit impedance calculator, dBm to voltage/power converter, Resistor calculator, Unit converters (metric/imperial)

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

**In-app purchases:** none


### Metis OS

[App page](https://appshunter.io/ios/app/metis-os-tactical/id6581486072)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iSlipstick free?

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

### Is Metis OS free?

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

### Do iSlipstick or Metis OS have ads?

Neither iSlipstick nor Metis OS shows ads.

### Which is updated more often, iSlipstick or Metis OS?

iSlipstick ships an update every 3 months, and Metis OS fortnightly. Most recently, iSlipstick was updated on October 31, 2026 and Metis OS on November 8, 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.*