Comparison

O'der stack vs RapidAI Connect

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

RapidAI Connect

Features
Read full description

AI Camera that Connects to Wi-Fi and Opens Websites Just by Capturing Information! Say goodbye to the hassle of typing! It also connects by capturing a Wi-Fi QR code. With the latest AI technology, 'RapidAI Connect' allows you to set up a Wi-Fi environment and access websites instantly with intuitive operations. No complicated settings needed. Connect quickly and make your life more comfortable. *An internet connection is required to use 'RapidAI Connect'. I will continue to make improvements.

Screenshots

O'der stack4 screens
RapidAI Connect1 screens

Verdict

The call

The clearest difference is in-app purchases: RapidAI Connect at none against O'der stack's 3. RapidAI Connect also leads on update cadence (daily vs every 3 months). O'der stack's advantage is ads (none vs shown) and device support (3 vs 1). On price 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. RapidAI Connect asks for nothing beyond the download.

UpkeepUpdate frequency

O'der stack ships an update every 3 months, RapidAI Connect daily. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

Scorecard5 real differences Β· 1 level
O'der stack versus RapidAI Connect: the parameters behind the verdict, then further details
ParameterO'der stackRapidAI Connect
PriceFreeFree
Update frequencyEvery 3 monthsDaily β€” better
AdsNo β€” betterYes
In-app purchasesYesNo β€” better
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS15.6 β€” better17.0
Further details β€” not scored
Size59 MB12 MB
Age rating4+4+
DeveloperICT Fractal Inc.MIYAKO KIKUTSUJI

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

RapidAI Connect

No in-app purchases

Questions

Is O'der stack free?
O'der stack is free to download, with in-app purchases available.
Is RapidAI Connect free?
RapidAI Connect is free to download, with no in-app purchases.
Do O'der stack or RapidAI Connect have ads?
RapidAI Connect shows ads; O'der stack does not.
Which is updated more often, O'der stack or RapidAI Connect?
O'der stack ships an update every 3 months, and RapidAI Connect daily. Most recently, O'der stack was updated on October 1, 2026 and RapidAI Connect on September 30, 2026.

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