Calculator vs Lotto Engine 2D
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator
This app offers a comprehensive scientific calculator with multiple modes, including algebraic, scientific, conversions, and logic calculations. It features a user-friendly design with large buttons and remembers your progress if interrupted.
- Algebraic entry
- Scientific calculations
- Unit conversions (length, area, volume, etc.)
- Logic calculator (binary, octal, decimal, hex)
- 10 memory registers
- Wide number range support
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Here's a full-featured scientific calculator for your iPhone or iPod touch. It's really six calculators in one, with new button sets exposed by a tap on the tab bar. Features are important, but it's the little things that count, right? Little things like a design that looks like it belongs on your iPhone; big, easy to press buttons; a delete key in case you hit the wrong one; and picking up right where you left off if you are interrupted by a phone call--even in the middle of entering a number. Features: 1. Algebraic entry 2. Scientific calculations 3. Conversions for - Length - Area - Volume - Temperature - Mass - Speed 4. Logic calculator supporting base 2, 8, 10 and 16 5. 10 memory registers 6. Numbers range from about 1e-313 to 1e308 7. Displays 14 significant digits
Lotto Engine 2D
This app generates random numbers using a physics-based simulation of balls in a container. Personalize your experience by selecting favorite numbers and enjoy a fun, easy-to-use random number picker.
- Physics-based 2D/3D ball simulation
- Random number generation
- Customizable settings
- Favorite number selection
- Easy to use interface
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Download the app today to personalize your experience by choosing your favorite numbers! A creative application that simulates the movement of a ball in a container, based on a real physics 2D/3D engine, a fun random ball generator. It is a must-have gadget. Easy to use and easy to custom settings. A handy random random number-picking tool. You need it!
Screenshots
Verdict
The clearest difference is price: Lotto Engine 2D at Free against Calculator's $1.99. Lotto Engine 2D also leads on rating (4.6 vs 4.0) and review sentiment (100% vs 60%). Calculator's advantage is in-app purchases (none vs 1). On 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
Lotto Engine 2D is free to download; Calculator costs $1.99 up front. Lotto Engine 2D sells 1 one-off in-app purchase. Calculator asks for nothing beyond the download.
Lotto Engine 2D holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Lotto Engine 2D has 14 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 60% of Calculator's written reviews are positive against 100% of Lotto Engine 2D's.
Calculator ships an update every 11 months, Lotto Engine 2D every 5 weeks. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.
| Parameter | Calculator | Lotto Engine 2D |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.0 (1 ratings) | 4.6 (14 ratings) — better |
| Positive reviews | 60.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 14 — better |
| Update frequency | Every 11 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Byte Works, Inc. | 何均 邓 |
Customer experience
Calculator
Lotto Engine 2D
In-app purchases
Calculator
No in-app purchases
Lotto Engine 2D
- Unlock All Features$1.99
Questions
Is Calculator free?
Is Lotto Engine 2D free?
Which has better reviews, Calculator or Lotto Engine 2D?
Do Calculator or Lotto Engine 2D have ads?
Which is updated more often, Calculator or Lotto Engine 2D?
Other comparisons
