# PeterJohn Book Keeping Calc — Business Calculator No Ads

> Business Calculator No Ads (iPhone/iPad app by Yasushi Obata.)

- Source: https://appshunter.io/ios/app/peterjohn-book-keeping-calc/id6762047165 (this page in markdown: same URL + `.md`)
- Developer: [Yasushi Obata](https://appshunter.io/developer/899977114)
- Category: Utilities, Business
- Price: $2.99
- Age rating: 4+
- Requires: iOS 15.0 · 206 MB
- Languages: American English
- Released: 2026-04-17
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/peterjohn-book-keeping-calc/id6762047165/reviews.md

## What is PeterJohn Book Keeping Calc?

****PeterJohn BookKeeping Calculator;

We Wanted Simple and Easy Calculator for BookKeeping.

**We Needed Independent Memory, Grand Total Memory.

**We Wanted AC, C, BackSpace,
 some of calculators doesNot have "C"(Clear Key),
or some of calculators doesNot have "BackSpace" key.

**We Wanted Not "MRC" But "MR" and "MC".
 some of calculators doesNot have the separated "MR" and "MC".
"MRC" makes us confused, 
when we want "MR", if there's Only "MRC", we might Ms-touch "MC",
when we want "MC", if there's Only "MRC", we might Mis-touch "MR".
when we want "MR", just we want Not "MRC" but "MR".
when we want "MC", just we want Not "MRC" but "MC".

****Basic Functions;
We determined that
we regard
"CASIO ND-26S Professional Business Calculator", its keyboard layout and basic function
as being  the industry standard calculator
'cause it  is Recommended 
by the "Japan Calculator Skills Certification Association"
and by some of BookKeeping School.

We implemented some of functions below;
01) Independent Memory Calculation(M+,M-,MR,MC);
2x3,M+→6
5x6,M+→30
8x9,M+→72
MR→108
MC
02) GrandTotal Memory Calculation(=,GT);
2x3,=→6
5x6,=→30
8x9,=→72
GT→108
03) Constant Calculation(++,--,xx,÷÷)
AC
3++
4=→7
5=→8
6=→9
AC
3--
4=→1
5=→2
6=→3
AC
3xx
4=→12
5=→15
6=→18
AC
3÷÷
4=→1.333
5=→1.666
6=→2
AC
04) Square Calculation(x=)
3x=→9
6x=→36
9x=→81
GT→126
05) SquareRoot Calculation(√)
4√→2
5√→2.236
06) Percent Calculation(%)
456%→4.56
07) Tax Rate Set and Tax Calculation;
(TaxRateSet)
AC,%,10,%→10
(TaxRate)
AC,TAX+→10
AC,1000,TAX+→1,100
AC,1100,TAX-→1,000


"PeterJohn BookKeeping Calculator" is Created Using "PeterJohn" technology.
So that you can use "Divide Water Keyboard" in LandScape mode.

****Warning About "Screen Rotation When Device Rotated" Settings;
There are Only Three Options in "Settings";
1) AutoRotation When Portrait Orientation is "UnLocked".
    If you use this app when Portrait Orientation is "UnLocked",
    you had better choose "1) AutoRotation".
2) LandScape When Portrait Orientation is "Locked".
3) PortRait When Portrait Orientation is "Locked".
    if you'd like to Fix  "2) LandScape" or "3) PortRait",
    you had better "Portrait Orientation Lock".

We don't recommend the Other Option;
Choosing 2) LandScape or 3) PortRait When Portrait Orientation is "UnLocked"..

Best Regards,
--Yasushi Yassun Obata


## Version history (last 4 releases)

### 2026.0823.2049 — 2026-08-23

ShowLogStdErrView;processAppear() method BugFixed Version;

After "Rename Script",
ShowLogStdErrView showed  the renamed script filename and the content of the renamed file.
so we Fixed the Bug by CommentOuting the three lines below 
in ShowLogStdErrView;processAppear() method.

****ShowLogStdErrView;processAppear();
if scriptAction == "scriptRenamed" {
scriptName = UserDefaults.standard.string(forKey: "scriptName")!
}//endif

This Bug Occurred Only When you renamed the Script filename 
and touched "Show logStdErr".
Now we Fixed it, so that, even if you renamed the Script filename,
you can see the file "logStdErr.txt" if you touched "Show logStdErr".

Regards,
--Yasushi Yassun Obata

### 2026.0815.1635 — 2026-08-15

Code ReFactoring Version;

just a code ReFactoring Version,
so Nothing Changed about function.

Regards,
--Yasushi Yassun Obata

### 2026.0430.0013 — 2026-04-29

iPhone which Has 736 Pixel Height or 736 Pixel Width Available ( and iOS26.4.1. Tested ) Version;

In this version,
you Can Use "PeterJohn Book Keeping Calc" on the iPhone which Has 
Less Than or Equal to 736 Pixel  Height in PortRait mode or 
Less Than or Equal to 736 Pixel Width in LandScape mode
such as iPhoneSE 3rd Generation or iPhone6S Plus.
iPhoneSE 3rd Generation has 667 Pixel Height in PortRait or 667 Pixel Width in LandScape.
iPhone6S Plus has 736 Pixel Height  in PortRait or 736 Pixel Width in LandScape.

Best Regards,
--Yasushi Yassun Obata

### 2026.0414.2054 — 2026-04-17

No release notes.

## More apps by Yasushi Obata

- [YassunPsalms](https://appshunter.io/ios/app/yassunpsalms/id1617333044)
- [YassunCallUpNotice](https://appshunter.io/ios/app/yassuncallupnotice/id1621617154)
- [YassunBitterness](https://appshunter.io/ios/app/yassunbitterness/id1624704495)
- [PeterJohn ThreeDim](https://appshunter.io/ios/app/peterjohn-threedim/id1632372110)
- [PeterJohn NumPy](https://appshunter.io/ios/app/peterjohn-numpy/id1662896316)
- [PeterJohn NumPy Matplotlib](https://appshunter.io/ios/app/peterjohn-numpy-matplotlib/id6471342492)

All apps by Yasushi Obata: https://appshunter.io/developer/899977114

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*