# iSlipstick vs Sales Engine

The clearest difference is update cadence: iSlipstick at every 3 months against Sales Engine's every 7 months. iSlipstick also leads on iOS requirement (12.0 vs 15.6). 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, Sales Engine every 7 months. The most recent releases landed on October 21, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | iSlipstick | Sales Engine |
| --- | --- | --- |
| 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** | Every 7 months |
| Monetization | Free | — |
| Size | 36 MB | 307 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sam Virgillo](https://appshunter.io/developer/324560825) | [Blu Zeus Technologies, LLC](https://appshunter.io/developer/1013827656) |

## 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


### Sales Engine

[App page](https://appshunter.io/ios/app/sales-engine/id1600508148)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is iSlipstick free?

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

### Is Sales Engine free?

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

### Do iSlipstick or Sales Engine have ads?

Neither iSlipstick nor Sales Engine shows ads.

### Which is updated more often, iSlipstick or Sales Engine?

iSlipstick ships an update every 3 months, and Sales Engine every 7 months. Most recently, iSlipstick was updated on October 21, 2026 and Sales Engine 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.*