# pdf vs InductorCalc

The clearest difference is price: InductorCalc at $0.99 against pdf's $9.99. InductorCalc also leads on review sentiment (100% vs 79%) and device support (3 vs 1). pdf's advantage is update cadence (every 2 weeks vs every 23 months). On ads, in-app purchases and monetization model there is nothing between them.

pdf costs $9.99 and InductorCalc $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

pdf ships an update every 2 weeks, InductorCalc every 23 months. The most recent releases landed on October 2, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | pdf | InductorCalc |
| --- | --- | --- |
| Price | $9.99 | **$0.99** |
| Rating | **[4.4 (27 ratings)](https://appshunter.io/ios/app/pdf-notes-for-ipad/id417200844/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 79.2% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 23 months |
| Monetization | Paid | Paid |
| Size | 138 MB | 17 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AMuseTec Co., Ltd.](https://appshunter.io/developer/342152781) | [oskari saarinen](https://appshunter.io/developer/1234576917) |

## What reviewers say

### pdf

[App page](https://appshunter.io/ios/app/pdf-notes-for-ipad/id417200844)

Manage and annotate PDF files on your iPad with fast page turning and intuitive finger-writing. Easily import, organize, and share your notes with friends. Offers a seamless reading and editing experience.

**Highlights:** Fast page turning and content scanning, Intuitive finger-writing with zoom-in, Easy PDF import via Dropbox, Email, or iTunes, Organized bookshelves with search, Variety of pens, highlighters, and text notes, Export annotated PDFs via email

**Features:** Vision Pro support

**In-app purchases:** none


### InductorCalc

[App page](https://appshunter.io/ios/app/inductorcalc/id1409402075)

Calculate essential parameters for custom inductors and coils. Input dimensions like turns, length, and diameter to instantly get inductance, Q-factor, wire length, and DC resistance. Ideal for electronics enthusiasts and students designing custom components.

**Highlights:** Calculate inductance (L), Calculate Q-factor at operating frequency, Calculate total wire length, Calculate DC resistance, Supports multiple SI units

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is pdf free?

pdf costs $9.99, with no in-app purchases.

### Is InductorCalc free?

InductorCalc costs $0.99, with no in-app purchases.

### Do pdf or InductorCalc have ads?

Neither pdf nor InductorCalc shows ads.

### Which is updated more often, pdf or InductorCalc?

pdf ships an update every 2 weeks, and InductorCalc every 23 months. Most recently, pdf was updated on October 2, 2026 and InductorCalc on September 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*