# Photonics Spectra vs Semi Dig

Photonics Spectra and Semi Dig are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Photonics Spectra ships an update every 10 months, Semi Dig every 17 months. The most recent releases landed on September 8, 2026 and May 18, 2026 respectively.

## The numbers

| Metric | Photonics Spectra | Semi Dig |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/photonics-spectra/id657383359/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 17 months |
| Monetization | Free | — |
| Size | 29 MB | 62 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Laurin Publishing Co., Inc.](https://appshunter.io/developer/657383362) | [Gold Flag Media LLC](https://appshunter.io/developer/1573843456) |

## What reviewers say

### Photonics Spectra

[App page](https://appshunter.io/ios/app/photonics-spectra/id657383359)

Access the leading magazine for the photonics industry on your mobile device. Read articles in a convenient format, download PDF issues, and search through archives of past content. Stay informed about optics, lasers, imaging, and more.

**Highlights:** Mobile-friendly article reading, Downloadable PDF issues, Searchable archives, Comprehensive industry coverage, Technical and practical information

**Features:** macOS Compatibility

**In-app purchases:** none


### Semi Dig

[App page](https://appshunter.io/ios/app/semi-dig/id1573843454)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Photonics Spectra free?

Photonics Spectra is free to download, with no in-app purchases.

### Is Semi Dig free?

Semi Dig is free to download, with no in-app purchases.

### Do Photonics Spectra or Semi Dig have ads?

Neither Photonics Spectra nor Semi Dig shows ads.

### Which is updated more often, Photonics Spectra or Semi Dig?

Photonics Spectra ships an update every 10 months, and Semi Dig every 17 months. Most recently, Photonics Spectra was updated on September 8, 2026 and Semi Dig on May 18, 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.*