# Source Viewer XL vs Calctronics

The clearest difference is price: Calctronics at Free against Source Viewer XL's $1.99. Calctronics also leads on update cadence (every 2 months vs every 28 months) and device support (3 vs 1). Source Viewer XL's advantage is review sentiment (57% vs 14%) and rating (4.7 vs 4.0). On ratings volume there is nothing between them.

Calctronics is free to download; Source Viewer XL costs $1.99 up front. Calctronics sells 1 one-off in-app purchase. Source Viewer XL asks for nothing beyond the download.

Source Viewer XL holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 3 and 5 respectively. Written reviews point the same way: 57% of Source Viewer XL's written reviews are positive against 14% of Calctronics's.

Source Viewer XL ships an update every 28 months, Calctronics every 2 months. Both last shipped on September 9, 2026.

## The numbers

| Metric | Source Viewer XL | Calctronics |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/source-viewer-xl/id364691406/reviews)** | [4.0 (5 ratings)](https://appshunter.io/ios/app/calctronics-circuit-calc/id1583972990/reviews) |
| Number of ratings | 3 | **5** |
| Positive reviews | **57.1% of reviews** | 14.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 28 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 35 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### Source Viewer XL

[App page](https://appshunter.io/ios/app/source-viewer-xl/id364691406)

View the HTML, CSS, and JavaScript source code of any website. Highlighted syntax, extracted links, and image galleries make code analysis easy. Save images, bookmarks, and history for later.

**Highlights:** Syntax highlighting for HTML, CSS, and JavaScript, Extracts and follows embedded links, Lists and views all website images, Saves images to photo album, Bookmark and session history management, Copy/paste code functionality

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

**In-app purchases:** none


### Calctronics

[App page](https://appshunter.io/ios/app/calctronics-circuit-calc/id1583972990)

This app provides a comprehensive suite of calculators and design tools for electronic engineering. It assists with circuit design, filter analysis, and component calculations for resistors, capacitors, and inductors. Ideal for both professionals and students, it simplifies complex electronic projects.

**Highlights:** Comprehensive calculator collection, Filter design with graph plotting, Resistor, transistor, capacitor design tools, Amplifier and inductor design, Circuit analysis and design, Offline functionality

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to the Pro version | $2.99 | one-time |


## Frequently asked questions

### Is Source Viewer XL free?

Source Viewer XL costs $1.99, with no in-app purchases.

### Is Calctronics free?

Calctronics is free to download, with in-app purchases available.

### Which has better reviews, Source Viewer XL or Calctronics?

Source Viewer XL is rated higher. Source Viewer XL averages 4.7 out of 5 from 3 ratings, while Calctronics averages 4.0 from 5 ratings.

### Do Source Viewer XL or Calctronics have ads?

Calctronics shows ads; Source Viewer XL does not.

### Which is updated more often, Source Viewer XL or Calctronics?

Source Viewer XL ships an update every 28 months, and Calctronics every 2 months. Most recently, Source Viewer XL was updated on September 9, 2026 and Calctronics on September 9, 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.*