# Thin Lens Equation Calc vs Pocket Printer

The clearest difference is price: Pocket Printer at Free against Thin Lens Equation Calc's $2.99. Pocket Printer also leads on update cadence (every 2 months vs every 27 months) and iOS requirement (13.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

Pocket Printer is free to download; Thin Lens Equation Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thin Lens Equation Calc ships an update every 27 months, Pocket Printer every 2 months. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Thin Lens Equation Calc | Pocket Printer |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[2.0 (5 ratings)](https://appshunter.io/ios/app/pocket-printer/id6444190726/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 1 MB | 240 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Karsten International B.V.](https://appshunter.io/developer/1652936503) |

## What reviewers say

### Thin Lens Equation Calc

[App page](https://appshunter.io/ios/app/thin-lens-equation-calc/id1414198278)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Pocket Printer

[App page](https://appshunter.io/ios/app/pocket-printer/id6444190726)

Connect to your printer via Bluetooth to easily create and print various documents. Edit text, insert images, icons, and barcodes, or use built-in templates for notes and lists.

**Highlights:** Bluetooth printer connection, Customizable note editor, Image editing tools, Barcode and QR code generation, Pre-built templates (notes, lists)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Thin Lens Equation Calc free?

Thin Lens Equation Calc costs $2.99, with no in-app purchases.

### Is Pocket Printer free?

Pocket Printer is free to download, with no in-app purchases.

### Do Thin Lens Equation Calc or Pocket Printer have ads?

Neither Thin Lens Equation Calc nor Pocket Printer shows ads.

### Which is updated more often, Thin Lens Equation Calc or Pocket Printer?

Thin Lens Equation Calc ships an update every 27 months, and Pocket Printer every 2 months. Most recently, Thin Lens Equation Calc was updated on October 25, 2026 and Pocket Printer on October 30, 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.*