Comparison

O'der stack vs 設計用電卓

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

Head to head
About

O'der stack

Features
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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.

About

設計用電卓

Features
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いつもの計算に、ちょっとした便利さをプラス。 「設計用電卓」は、スマホでの使いやすさを追求したシンプルな電卓アプリです。 ● 主な機能: ・履歴表示機能:最大3件まで計算結果を保持 ・便利なショートカット:910グリッドの設計に便利なショートカットを搭載 ・見やすいUI:どんな画面サイズでも操作しやすいレイアウト ・スムーズな動作:軽量設計でサクサク動く! 今すぐインストールして、あなたの計算をもっとスムーズに!

Screenshots

O'der stack4 screens
設計用電卓2 screens

Verdict

The call

The clearest difference is in-app purchases: 設計用電卓 at none against O'der stack's 3. 設計用電卓 also leads on update cadence (every 3 days vs every 3 months) and iOS requirement (12.0 vs 15.6). O'der stack's advantage is ads (none vs shown). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. O'der stack sells 3 one-off in-app purchases. 設計用電卓 asks for nothing beyond the download.

UpkeepUpdate frequency

O'der stack ships an update every 3 months, 設計用電卓 every 3 days. The most recent releases landed on September 13, 2026 and August 25, 2026 respectively.

Scorecard4 real differences · 2 level
O'der stack versus 設計用電卓: the parameters behind the verdict, then further details
ParameterO'der stack設計用電卓
PriceFreeFree
Update frequencyEvery 3 monthsEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size59 MB114 MB
Age rating4+4+
DeveloperICT Fractal Inc.Kairu Inoue

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

設計用電卓

No in-app purchases

Questions

Is O'der stack free?
O'der stack is free to download, with in-app purchases available.
Is 設計用電卓 free?
設計用電卓 is free to download, with no in-app purchases.
Do O'der stack or 設計用電卓 have ads?
設計用電卓 shows ads; O'der stack does not.
Which is updated more often, O'der stack or 設計用電卓?
O'der stack ships an update every 3 months, and 設計用電卓 every 3 days. Most recently, O'der stack was updated on September 13, 2026 and 設計用電卓 on August 25, 2026.

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