O'der stack vs MultiiCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O'der stack
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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 π, 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. —Functions— 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 —Pro plan— 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) - Each item can be selected from 8bit, 16bit, 24bit, 32bit, 64bit and 128bit. - Supports negative values and decimal points. - 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.
MultiiCalc
Save and reuse your important calculations. This tool lets you store named values to easily perform complex financial or cost analyses without losing track of intermediate steps. Share your results with others or export them to different applications.
- Save notable calculations by name
- Calculate against saved list items
- Track complex financial analyses
- Share calculations with friends
- Export calculations to other apps
- No analytics or tracking
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MultiiCalc allows you to keep your notable calculations saved to a list by name so that you can calculate other values against those list items later. Imagine you want to calculate the potential profit of a real estate investment, or the cost of a new home, perhaps the cost of a vacation. There are so many different fees and percentages that will need to be calculated that a simple calculator app will not be able to handle in one go. With MultiiCalc, you can save your values along the way and come back later - or just save and keep calculating so you don't lose track. You can even share your calculations with your friends or other apps! All of your data is YOUR data. I don't have any analytics or tracking in here, enjoy!
Screenshots
Verdict
The clearest difference is update cadence: MultiiCalc at monthly against O'der stack's every 3 months. On price, ads, in-app purchases 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
Both are free to download. O'der stack sells 3 one-off in-app purchases and MultiiCalc sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
O'der stack ships an update every 3 months, MultiiCalc monthly. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.
| Parameter | O'der stack | MultiiCalc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (9 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 9 — better |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 59 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ICT Fractal Inc. | Christina Schell |
In-app purchases
O'der stack
- Free trial for 7 days.Free
- Activate for 1 month.$0.99
- Activate for year.$9.99
MultiiCalc
- A Generous Tip$1.99
- A Hefty Tip$3.99
- A Lavish Tip$6.99








