# Silverlog Flash

> Silverlog Flash (iPhone/iPad app by Simon Westgate.)

- Source: https://appshunter.io/ios/app/silverlog-flash/id6757318928 (this page in markdown: same URL + `.md`)
- Developer: [Simon Westgate](https://appshunter.io/developer/1856537803)
- Category: Photo & Video
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 27 MB
- Languages: English
- Released: 2026-03-18
- Data updated: 2026-07-09
- User reviews in markdown: https://appshunter.io/ios/app/silverlog-flash/id6757318928/reviews.md

## What is Silverlog Flash?

Silverlog Flash calculates flash exposure using guide numbers — the fundamental relationship between flash power, distance and aperture.

HOW IT WORKS
Enter your flash guide number, then either the distance to your subject or your desired aperture. The calculator works both ways: distance to aperture, or aperture to maximum distance. Adjust ISO to see how sensitivity affects your working range.

FEATURES
• Guide number to aperture calculation
• Guide number to maximum distance calculation
• ISO adjustment
• Metric and imperial distance units
• Works offline — no internet connection needed
• Clean, focused interface
• Dark mode support

USEFUL FOR
• Manual flash photography without TTL
• Working out flash-to-subject distance for off-camera flash
• Understanding your flash's effective range at different apertures
• Film photographers using manual flash units
• Studio photographers calculating lighting ratios

Part of the Silverlog photography toolkit. No account required. No data collected.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Nice One | $0.99 | one-time |
| Absolute Hero | $4.99 | one-time |
| Actual Saint | $29.99 | one-time |
| Legend | $2.99 | one-time |
| Guardian Angel | $9.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-03-18

No release notes.

## More apps by Simon Westgate

- [Silverlog](https://appshunter.io/ios/app/silverlog/id6755815649)
- [Silverlog Reciprocity](https://appshunter.io/ios/app/silverlog-reciprocity/id6756740671)
- [Silverlog Mix](https://appshunter.io/ios/app/silverlog-mix/id6756785829)
- [Silverlog DoF](https://appshunter.io/ios/app/silverlog-dof/id6756788185)
- [Silverlog Hyperfocal](https://appshunter.io/ios/app/silverlog-hyperfocal/id6756801107)

All apps by Simon Westgate: https://appshunter.io/developer/1856537803

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-09.*