Big Number Calculator+ vs PFD Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Big Number Calculator+
Perform calculations with extremely large numbers, up to 66,000 digits. Supports addition, subtraction, multiplication, and division, with options for different calculation engines and data input methods. Results can be saved and printed in formatted text files.
- Handles up to 66,000 digits
- Addition, subtraction, multiplication, division
- Selectable calculation engines (Swift, Objective-C)
- Load data from files (txt, rtf, rtfd)
- Automatic data formatting for printing and saving
- Customizable number separators
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“Big Number Calculator+” is an application that can calculate very large numbers. The format that can be used is decimal (integer). The calculation functions that can be used are addition, subtraction, multiplication, and division. The number of digits is limited to 66000 digits. Only plus signs can be used. Minus signs cannot be used. The calculation engine used in the calculation can be selected from “Swift” and “Objective-C”. You can also view the source code of the calculation engine. Please use at your own risk. Only numerical values (1,2,3,4,5,6,7,8,9,0) are extracted from the input data. You can optionally enter non-numeric characters. It can be used as a delimiter. It can be load from a file in addition to direct input. Input data and calculation results are automatically formatted for printing and saving. The save file is saved in text format (.txt). "Big Number Calculator" for macOS is also available. Main Specifications • iOS 13 and iPadOS 13 or later Main functions Maximum number of digits of input data • 66000 digits Calculation function • Addition, subtraction, multiplication, division The algorithm uses the "brush calculation method". The division is displayed as “quotient and remainder". Calculation engine • “Swift” and “Objective-C” can be selected. Numeric format • Decimal number (integer) Only the plus sign can be used as the sign. Minus signs cannot be used. Numerical input • Only numerical values (1,2,3,4,5,6,7,8,9,0) are extracted. • Characters other than numerical values can be entered in the option settings. Can be used as a delimiter. Load from file • The file types that can be load are "txt, rtf, rtfd". Data replacement and registration • Input data and calculation results can be replaced by dragging and dropping. It can also be registered in the register. Separation • Separate with the selected delimiter (comma and space). • Separate by the selected number of separation digits (3, 6, 10, 16, 24). Any number of separation digits can be entered. Printing • Input data and calculation results are automatically formatted. Save • Input data and calculation results are automatically formatted. • The file format is text (.txt) format. Source code • The source code of the calculation engine can be displayed. Please use at your own risk.
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
The clearest difference is ads: Big Number Calculator+ at none against PFD Calc's shown. PFD Calc's advantage is update cadence (every 5 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.
Big Number Calculator+ ships an update every 4 months, PFD Calc every 5 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Big Number Calculator+ | PFD Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 4 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 19 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Kunio Takeuchi | Kazuhisa Kobayashi |
In-app purchases
Big Number Calculator+
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is Big Number Calculator+ free?
Is PFD Calc free?
Do Big Number Calculator+ or PFD Calc have ads?
Which is updated more often, Big Number Calculator+ or PFD Calc?
Other comparisons
