# Smart Slide Rule vs eSartor

The clearest difference is price: eSartor at Free against Smart Slide Rule's $0.99. eSartor also leads on ratings volume (3 vs 1). Smart Slide Rule's advantage is iOS requirement (11.0 vs 14.0). On rating, review sentiment, update cadence and ads there is nothing between them.

eSartor is free to download; Smart Slide Rule costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Smart Slide Rule against 5.0 for eSartor. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Smart Slide Rule | eSartor |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/smart-slide-rule/id975047971/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/esartor/id6504975941/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | **Free** |
| Size | 4 MB | 79 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sohta Itoh](https://appshunter.io/developer/965803614) | [SAGEFARC LLC](https://appshunter.io/developer/1529181367) |

## What reviewers say

### Smart Slide Rule

[App page](https://appshunter.io/ios/app/smart-slide-rule/id975047971)

This app simulates a mechanical analog calculating tool, offering various logarithmic scales for multiplication, division, and trigonometric functions. It includes instructions on how to use the slide rule, making it a learning tool for this historical device.

**Highlights:** Simulates a slide rule, Includes A, B, C, CI, D, S, L, T, and K scales, Moveable slide strip and cursor, Instructions on slide rule usage, Calculates multiplication, division, and functions

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

**In-app purchases:** none


### eSartor

[App page](https://appshunter.io/ios/app/esartor/id6504975941)

Connect with local tailors for alterations, custom clothing, and sustainable fashion. Browse profiles, read reviews, and find specialists in traditional attire. Experience personalized tailoring that matches your style and values.

**Highlights:** Connect with local tailors, Alterations and custom clothing, Sustainable fashion options, Browse tailor profiles and ratings, Specialists in traditional ethnic attire

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smart Slide Rule free?

Smart Slide Rule costs $0.99, with no in-app purchases.

### Is eSartor free?

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

### Which has better reviews, Smart Slide Rule or eSartor?

Smart Slide Rule and eSartor are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Smart Slide Rule or eSartor have ads?

Neither Smart Slide Rule nor eSartor shows ads.

### Which is updated more often, Smart Slide Rule or eSartor?

Smart Slide Rule ships an update every 2 months, and eSartor every 2 months. Most recently, Smart Slide Rule was updated on November 1, 2026 and eSartor on October 30, 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.*