# Smart Slide Rule vs Monocle AI

The clearest difference is price: Monocle AI at Free against Smart Slide Rule's $0.99. Monocle AI also leads on update cadence (every 2 days vs every 2 months) and ratings volume (9 vs 1). Smart Slide Rule's advantage is in-app purchases (none vs 4) and iOS requirement (11.0 vs 13.4). On rating, review sentiment, ads and device support there is nothing between them.

Monocle AI is free to download; Smart Slide Rule costs $0.99 up front. Monocle AI sells 4 in-app purchases, starting at $1.99 per month. Smart Slide Rule asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Smart Slide Rule against 5.0 for Monocle AI. That said, the two scores are not equally well evidenced: Monocle AI has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Smart Slide Rule ships an update every 2 months, Monocle AI every 2 days. The most recent releases landed on October 19, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Smart Slide Rule | Monocle AI |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/smart-slide-rule/id975047971/reviews) | [5.0 (9 ratings)](https://appshunter.io/ios/app/monocle-ai-human-notes/id6473706237/reviews) |
| Number of ratings | 1 | **9** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 30 MB |
| Requires iOS | **11.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sohta Itoh](https://appshunter.io/developer/965803614) | [Ian Johnson](https://appshunter.io/developer/1538379193) |

## 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


### Monocle AI

[App page](https://appshunter.io/ios/app/monocle-ai-human-notes/id6473706237)

This app helps you remember important details about the people in your life, from birthdays and anniversaries to favorite foods and hobbies. It allows you to organize relationships, track significant dates, and store information about pets and locations, all with a focus on privacy and offline access.

**Highlights:** Track personal connections, Remember birthdays and anniversaries, Store favorite foods and hobbies, Organize relationships, Record significant dates and events, Manage details about pets and locations, Offline and privacy-first design

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - Monthly | $1.99 | per month |
| Pro - Monthly | $3.99 | per month |
| Lifetime | $19.99 | one-time |
| Pro - Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Smart Slide Rule free?

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

### Is Monocle AI free?

Monocle AI is free to download, with in-app purchases available.

### Which has better reviews, Smart Slide Rule or Monocle AI?

Smart Slide Rule and Monocle AI are both rated 5.0 out of 5 on the App Store, from 1 and 9 ratings respectively.

### Do Smart Slide Rule or Monocle AI have ads?

Neither Smart Slide Rule nor Monocle AI shows ads.

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

Smart Slide Rule ships an update every 2 months, and Monocle AI every 2 days. Most recently, Smart Slide Rule was updated on October 19, 2026 and Monocle AI on October 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.*