Comparison

O'der stack vs MSRX AI Calculator

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

O'der stack

Features
Read full description

O'der stack is a scientific calculator that is precise for up to 38 digits and is highly flexible. It can be used for various purposes, from learning to professional use, and has many functions that are convenient when mastered. The formulas described can be saved together with the results of the calculations and easily shared among members. Also, labels and memos can be set for formulas as well as each item that makes up the formulas. For example, by adding the label "radius" to "50" in 2 x 50 x Ο€, it is possible to make the meaning of the formula even clearer. It is also perfect for entering explanations of formulas as memos and using them as tools to assist in learning. O'der stack offers two plans, the Pro plan which offers unlimited use of all functions, as well as the Free plan which makes it usable as an easy-to-use scientific calculator. β€”Functionsβ€” 1. A powerful editing function that allows partial overwriting of values without erasing the formula 2. Label and memo functions to support the understanding of formulas 3. A clipboard function that allows formulas to be pasted in notebooks, etc. 4. Setting the precision of calculations from 0 digits to 38 digits 5. Setting units (degrees/radians) for trigonometric functions 6. Setting the format of displaying results of calculations (normal notation, scientific notation, and percentage notation) 7. Basic functions (exponentiation and nth root) 8. Undo function β€”Pro planβ€” Please download O'der stack and try out the Pro plan for free for seven days. In addition to all the functions in the Free plan, the Pro plan allows for the activation of even more convenient functions. 1. Functions to save and load formulas and calculation histories 2. Function to share formulas and calculation histories 3. A sub-formula function that allows for the breakdown into several formulas and simple entry 4. 18 types of versatile and widely-used functions 5. 652 highly precise numerical and physical constants and observed values 6. Setting the format of displaying results of calculations (binary, octal, hexadecimal) Β Β Β Β Β Β  - Each item can be selected from 8bit, 16bit, 24bit, 32bit, 64bit and 128bit. Β Β Β Β Β Β  - Supports negative values and decimal points. Β Β Β Β Β Β  - Negative values are displayed in complement. After the free trial has ended, if you would like to continue to use the Pro plan, a purchase of a non-autorenew-subscriptionis required. For a subscription, you can choose either a monthly purchase or yearly purchase, and the yearly purchase allows you to enjoy a discount worth two months of monthly purchases. Payment will be charged to your Apple ID account at the confirmation of purchase. If you purchase a plan during the effective period, it will be extended by the number of days of the purchased plan from the end date. The plan is effective on all devices linked to the purchased Apple ID account. Privacy policy https://ictfractal.github.io/official/PrivacyPolicy.html Terms of service https://ictfractal.github.io/official/AppTerms.pdf Disclaimer ICT Fractal Inc. does not guarantee the accuracy, credibility, and compatibility of the results of calculations and information provided through this app. Furthermore, it does not bear the responsibility for direct or indirect damages that might occur through this app.

About

MSRX AI Calculator

Features
Read full description

MSRX AI Calculator answers everyday maths the way you would ask it out loud, and shows you how it got there. Type or dictate a question β€” "split an 84.50 bill with a 20% tip between three", "30% off 149", "add 8.5% tax to 60", "12 km to miles", "300000 loan at 6.5% over 25 years". You get the number, a plain-English answer, and the working, so you can check it rather than trust it. EXACT BY DESIGN The intelligence reads your question. A separate maths engine does the arithmetic. Every figure on screen comes from that engine, never from a language model guessing at digits β€” so a tip split lands on 28.32, not a plausible 28.30. A TAPE, NOT A BOX The display keeps the roll. Recent calculations sit above the current line, ruled off like a printing calculator, and any of them can be tapped to reuse. Select several in History to read their running total, or export the roll as a PDF. A PROPER CALCULATOR UNDERNEATH β€’ Standard and scientific keypads β€’ Trigonometry in degrees or radians, inverse and hyperbolic functions β€’ Logarithms, roots, powers, factorials, brackets and constants β€’ Memory keys, a reusable last answer, and live results as you type β€’ Full hardware keyboard support on iPad NAME THE FIGURES YOU REUSE Type tax = 8.5 once, then use "tax" in any calculation. Change it and every expression that reads it follows. CONVERTER Length, mass, temperature, volume, area, speed, time, data, angle β€” and currency, using daily reference rates, with the source and publication date always on screen. ASK FROM ANYWHERE Siri, Spotlight and Shortcuts answer without opening the app. A widget keeps the last result on your Home or Lock Screen, and a Control Centre button opens the calculator ready for a question. HISTORY THAT REMEMBERS Every calculation and answer is kept, searchable and pinnable. Tap any entry to load it back into the keypad. PRIVATE BY DEFAULT No account, no sign-up, no advertising, no analytics, no tracking. Your keypad calculations, named values and history are local to your device. Newer Phones answer plain-language questions on-device too. On older Phones a built-in offline solver handles the everyday ones, and only the questions it cannot parse are sent β€” as text alone, with no identity attached β€” to an AI service to be answered. Designed and built by MSRX.

Screenshots

O'der stack4 screens
MSRX AI Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: MSRX AI Calculator at none against O'der stack's 3. O'der stack's advantage is iOS requirement (15.6 vs 26.2). On price, update cadence, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. O'der stack sells 3 one-off in-app purchases. MSRX AI Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

O'der stack ships an update every 3 months, MSRX AI Calculator every 6 months. Both last shipped on October 25, 2026.

Scorecard2 real differences Β· 4 level
O'der stack versus MSRX AI Calculator: the parameters behind the verdict, then further details
ParameterO'der stackMSRX AI Calculator
PriceFreeFree
Update frequencyEvery 3 months β€” betterEvery 6 months
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPad, iPod β€” betteriPhone, iPad
Requires iOS15.6 β€” better26.2
Further details β€” not scored
Size59 MB7 MB
Age rating4+4+
DeveloperICT Fractal Inc.Mrinal Singh Raja

In-app purchases

3 purchases

O'der stack

One-time3
  • Free trial for 7 days.Free
  • Activate for 1 month.$0.99
  • Activate for year.$9.99
None

MSRX AI Calculator

No in-app purchases

Questions

Is O'der stack free?
O'der stack is free to download, with in-app purchases available.
Is MSRX AI Calculator free?
MSRX AI Calculator is free to download, with no in-app purchases.
Do O'der stack or MSRX AI Calculator have ads?
Neither O'der stack nor MSRX AI Calculator shows ads.
Which is updated more often, O'der stack or MSRX AI Calculator?
O'der stack ships an update every 3 months, and MSRX AI Calculator every 6 months. Most recently, O'der stack was updated on October 25, 2026 and MSRX AI Calculator on October 25, 2026.

Other comparisons