Smart Slide Rule vs Monocle AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart Slide Rule
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.
- 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
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* An app simulating a slide rule! * Smart Slide Rule reproduces a slide rule (slipstick) with A, B, C, CI, D, S, L, T, and K scales. A slide rule is a mechanical analog calculating tool that uses the principle of logarithms. The slide rule appears as an important prop in the movies "Apollo 13" and "The Wind Rises". This application reproduces a slide rule on the screen of your device. The front side of the slide strip corresponds to the B, C, and CI scales, and the back side corresponds to the S, L, and T scales. You can move the slide strip and the cursor. * With instructions on how to use the slide rule! * The slide rule uses a logarithmic scale to calculate multiplication, division, exponentiation, square root, and trigonometric and logarithmic functions. This application features an explanation of how to use the slide rule, so you can learn how to calculate. Since the calculation is performed in pixels of the device screen, the accuracy of the calculation cannot be guaranteed.
Monocle AI
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.
- 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
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Offline and privacy first, native dark mode, no ads. Monocle is a comprehensive app designed for those who value the nuances of their social and personal connections. With Monocle, effortlessly track and manage important details about the people in your life - from family and friends to colleagues and acquaintances. Whether it's remembering birthdays, anniversaries, or the little things like favorite foods and hobbies, Monocle ensures you're always in up to date with your personal network. Organize relationships, mark significant dates or events, and keep a record of meaningful locations, pets, and more. Enhance your connections with thoughtful details, all securely stored and easily accessible. With Monocle, you're not just managing contacts; you're nurturing relationships. Terms of use - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Smart Slide Rule | Monocle AI |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (9 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 9 — better |
| Update frequency | Every 2 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 4 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Sohta Itoh | Ian Johnson |
Customer experience
Smart Slide Rule
Monocle AI
In-app purchases
Smart Slide Rule
No in-app purchases
Monocle AI
- Pro - Monthly$1.991 Month
- Pro - Monthly$3.991 Month
- Lifetime$19.99
- Pro - Lifetime$39.99









