JSCalculator vs Lexmark
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JSCalculator
This advanced calculator evaluates expressions as you type, eliminating the need for an equals key. It supports complex formulas, variables, and predefined constants, making it ideal for scientific and engineering tasks.
- Instant evaluation as you type
- Formula entry with variables
- Multi-step formulas
- History of entered formulas
- Predefined constants of nature
- Copy and paste functionality
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Not an imitation of a limited stand alone electronic calculator of old. This is a calculator that exploits the power of the device it is running on. It works slightly differently, but it allows for more flexibility. As an example, JSCalculator evaluates what you type without the need of hitting "=" or an enter key. In this calculator, the "=" key is for assigning values to variables, not for telling it to execute a calculation! In JSCalculator, what you enter can be a standard calculation like "1+2", but it can also be much more! JSCalculator was developed by a physicist who needed to be able to enter a short formula on an iOS device, and have it evaluated for various values of some parameters. In addition to predefined functions and the ability to edit even longer or multi-step expressions, this calculator provides a set of the most used constants of nature (in SI units). Short list of the main features: - No enter key. No equal sign that must be pressed to execute a calculation. - What you write is evaluated as you type, and you immediately see the result. - Enter formulas, not just calculations. - Use multi-step formulas with intermediate (algebraic) variables. - Example of a multi-step formula: "p = sqr(a)+b;sin(p)/p" - Every formula you enter is stored, so that you can re-use it the next time you use the calculator. Cycle through all formulas with arrow buttons on the front screen or via standard lists. - Intelligent exponential/engineering notation for the calculated results (optional). - Several predefined mathematical functions. - Predefined constants of nature. - Ability to copy and paste. Ability to copy the result of calculations, or the values of one of the predefined constants of nature. - Numeric keys for typing numbers, predefined functions, or constants, but the standard keyboard will appear when the "T" button is pressed. Any issues or questions? Use our feedback form to tell us about them: http://ivpadev.com/support.html
Lexmark
Easily set up your wireless printer, manage supplies, and subscribe to printing services on the go. This app supports document scanning and ordering necessary items for your Lexmark devices.
- Wireless printer setup
- Manage and order supplies
- Lexmark OnePrint™ subscription
- Document image capture
- On-the-go management
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Simplify printer setup, manage and order supplies or sign up for Lexmark OnePrint™ subscription on-the-go. With the Lexmark app, you can: -Set up your wireless printer with ease -Manage and order supplies -Subscribe to Lexmark OnePrint™ -Capture document images with your device's camera Supported Lexmark printers: Color All-In-One Laser 2-series Basic (MC3224dwe) Color All-In-One Laser 2-series (MC3224i) Color All-In-One Laser 3-series (MC3326i) Color All-In-One Laser 3-series (CX331adw) Color All-In-One Laser 4-series (MC3426i) Color All-In-One Laser 4-series (CX431adw) Color Printer Laser 2-series (C3224dw) Color Printer Laser 3-series (C3326dw) Color Printer Laser 3-series (C331dw) Color Printer Laser 4-series (C3426dw) Color Printer Laser 4-series (CS431dw) Black and White All-in-One Laser 2-series (MB2236adw) Black and White All-in-One Laser 3-series (MB2236i) Black and White All-in-One Laser 4-series (MB3442i) Black and White All-in-One Laser 4-series (MX431adw) Black and White Printer Laser 2-series (B2236dw) Black and White Printer Laser 3-series (B3340dw) Black and White Printer Laser 4-series (B3442dw) Black and White Printer Laser 4-series (MS431dw)
Screenshots
Verdict
The clearest difference is review sentiment: JSCalculator at 100% against Lexmark's 15%. JSCalculator also leads on rating (5.0 vs 3.2). Lexmark's advantage is price (Free vs $0.99) and update cadence (monthly vs every 25 months). On ads, in-app purchases, device support and iOS requirement 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
Lexmark is free to download; JSCalculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
JSCalculator holds the better App Store score, 5.0 against 3.2. That said, the two scores are not equally well evidenced: Lexmark has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of JSCalculator's written reviews are positive against 15% of Lexmark's.
JSCalculator ships an update every 25 months, Lexmark monthly. The most recent releases landed on October 3, 2026 and October 13, 2026 respectively.
| Parameter | JSCalculator | Lexmark |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 3.2 (18 ratings) |
| Positive reviews | 100.0% of reviews — better | 15.4% of reviews |
| Number of ratings | 2 | 18 — better |
| Update frequency | Every 25 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15 | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 84 MB |
| Age rating | 4+ | 4+ |
| Developer | Ivan Biaggio | Lexmark International, Inc. |
Customer experience
JSCalculator
Lexmark
In-app purchases
JSCalculator
No in-app purchases
Lexmark
No in-app purchases
Questions
Is JSCalculator free?
Is Lexmark free?
Which has better reviews, JSCalculator or Lexmark?
Do JSCalculator or Lexmark have ads?
Which is updated more often, JSCalculator or Lexmark?
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