Whois Pro vs DB50X
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Whois Pro
This app helps you make decisions by spinning a customizable wheel. It's perfect for choosing between options, playing games, or adding fun to group activities. Add emojis and a scrolling info line to personalize your spins.
- Randomize any choice
- Up to 8 players/choices
- Customizable wheel
- Add emojis
- Scrolling info line
- No ads
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Spin & Win with the WhoIs Pro... like a Pro! Up to 8 players/choices! Ever struggled to make a decision? Torn between pizza or tacos? Can't decide who pays for the next round of drinks? Enter the magical world of the Who Is... app, where choices are just a spin away! Why WhoIs Pro? Randomize Any Choice: From restaurants to weekend plans, let the wheel decide your fate! Perfect for game nights, challenges, or just good ol' fun! Customizable & Stylish: add emojis, with a scrolling info line So, why flip a coin when you can spin a wheel? Download WhoIs Pro now and let the randomness roll! Who knows? Your next adventure might just be a spin away! Absolutely NO ads! Have fun! We support Ukraine
DB50X
This scientific calculator offers high-precision computations with arbitrary precision for numbers. It supports advanced functions like complex numbers, matrices, symbolic calculations, and graphing, with a user-friendly interface and extensive built-in help.
- Arbitrary precision calculations
- RPN and algebraic operations
- Complex numbers, vectors, matrices
- Symbolic and numerical solving
- Graphing and plotting
- Engineering units and constants
- Unicode text support
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DB50X is a new high-precision scientific calculator inspired by the legendary HP50G series from Hewlett-Packard. It is not an emulator, but a redesign from scratch, which is faster, and delivers never seen before capabilities like computations in arbitrary precision. Like the original HP50G, DB48X supports an unlimited stack, RPN and algebraic operations, complex numbers, based numbers, vectors, matrices, text, symbolic computations, numerical solving and integration, graphing and plotting, statistics, engineering units, and well over 1000 built-in functions. It integrates a library of equations and constants covering mathematics, physics or chemistry. Using modern technologies, DB50X goes well beyond the original HP50G in many ways: - It is significantly faster, uses less memory, and features a higher-resolution 240x400 pixels graphical color display. - Integer and decimal values can have an arbitrarily large number of digits, so you can compute log(pi) with 200 digits in a few keystrokes. - The six function keys feature up to three function per key, giving quick access to up to 18 related functions at a time. - Complex numbers can mix and match polar and rectangular form. - Symbolic operations extend to complex numbers, vectors and matrices. - Based numbers can be in any base from 2 to 36, and support any number of bits, making it easy to emulate a 23-bit or 512-bit processor. - Text is represented using Unicode instead of the proprietary HP encoding, facilitating data exchange with the rest of the world. - Multiple graphs can be distinguished using colour patterns - Engineering units include all the modern evolutions of the SI system, and can be configured by the user, e.g. to integrate currency units with the exchange rate du jour. Converting between USD/hour and EUR/day has never been so easy! - A built-in hyperlinked help system documents functions simply by holding the corresponding key, and combine a quick start guide, a user manual and a reference manual. - Over 700K of memory is available for RPL programs. - Access to iCloud to save your program and edit them from your Mac. DB508X will run many user RPL programs designed for the HP48, HP49 or HP50 directly as is. However, since it is not an emulator, it will not run any HP binary object, and notably will not run HP50G games or anything involving system RPL. This is an early-access release. Please consult https://github.com/c3d/db48x/blob/stable/doc/5-Unimplemented.md for a list of commands that are not yet implemented. DB50X is part of a family of related calculators that include the black-and-white DB48X and the entry-level DB40X.
Screenshots
Verdict
The clearest difference is price: Whois Pro at Free against DB50X's $9.99. Whois Pro also leads on iOS requirement (12.1 vs 14.0). DB50X's advantage is in-app purchases (none vs 1) and chart position (#189 vs unranked). On rating, 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
Whois Pro is free to download; DB50X costs $9.99 up front. Whois Pro sells 1 one-off in-app purchase. DB50X asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Whois Pro against 5.0 for DB50X. That said, the two scores are not equally well evidenced: DB50X has 8 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | Whois Pro | DB50X |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 5.0 (1 ratings) | 5.0 (8 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 8 — better |
| Update frequency | — | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | — | #189 — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.1 — better | 14.0 |
| Further details — not scored | ||
| Size | 2 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | AMAXIM APPS, INC | Christophe de Dinechin |
Customer experience
Whois Pro
DB50X
In-app purchases
Whois Pro
- WhoIs Premium$1.99
DB50X
No in-app purchases









