Smart Slide Rule vs eSartor
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.
eSartor
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.
- Connect with local tailors
- Alterations and custom clothing
- Sustainable fashion options
- Browse tailor profiles and ratings
- Specialists in traditional ethnic attire
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eSARTOR is an innovative app connecting customers with local professional tailors for services like alterations, custom clothing, and sustainable fashion solutions. Users can browse tailor profiles, complete with ratings, reviews, and availability, ensuring the perfect match for their needs. The platform emphasizes sustainability by featuring tailors who practice eco-friendly methods and highlights cultural diversity through partnerships with specialists in traditional ethnic attire. Join eSARTOR to experience personalized tailoring that aligns with your style and values.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Smart Slide Rule | eSartor |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (3 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 4 MB | 79 MB |
| Age rating | 4+ | 4+ |
| Developer | Sohta Itoh | SAGEFARC LLC |
Customer experience
Smart Slide Rule
eSartor
In-app purchases
Smart Slide Rule
No in-app purchases
eSartor
No in-app purchases
