Physical Constants vs PFD Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Physical Constants
Access a comprehensive list of physical constants, organized by category for easy searching. This app supports all AppStore languages and allows users to report corrections via email.
- Physical constants database
- Categorized by topic
- Search functionality
- Multi-language support
- User feedback for corrections
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Application that displays the physical constants. Classified by category, easy to search. Supports all languages in the AppStore. If you find something to be corrected, please send an E-mail (English or Japanese).
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
The clearest difference is update cadence: PFD Calc at every 5 weeks against Physical Constants's every 9 months. Physical Constants's advantage is iOS requirement (12.0 vs 15.0). 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. Neither carries in-app purchases, so what you see is what you pay.
Physical Constants ships an update every 9 months, PFD Calc every 5 weeks. The most recent releases landed on August 24, 2026 and September 17, 2026 respectively.
| Parameter | Physical Constants | PFD Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (3 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 9 months | Every 5 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 25 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Takuya Ishikawa | Kazuhisa Kobayashi |
In-app purchases
Physical Constants
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is Physical Constants free?
Is PFD Calc free?
Do Physical Constants or PFD Calc have ads?
Which is updated more often, Physical Constants or PFD Calc?
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