# Stopwise – Exposure Dial — Exposure calculator, offline

> Exposure calculator, offline (iPhone/iPad app by Zheng-Feng Chen.)

- Source: https://appshunter.io/ios/app/stopwise-exposure-dial/id6798600885 (this page in markdown: same URL + `.md`)
- Developer: [Zheng-Feng Chen](https://appshunter.io/developer/6798600887)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 3 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, Russian, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-09-01
- Data updated: 2026-10-06
- User reviews in markdown: https://appshunter.io/ios/app/stopwise-exposure-dial/id6798600885/reviews.md

## What is Stopwise?

Stopwise is not a light meter — it is an exposure calculator.

It does not use your camera or any light sensor. You enter what you already know — an EV value, or an existing aperture / shutter / ISO combination — and it works out the equivalent settings.

Because it only does the maths, the result never depends on your lens, sensor or OS version. Fully offline, no network needed.


■ How it works

Three dials: aperture, shutter, ISO. Each row has a lock on the right.

・One locked — turn either open dial and the other compensates. The EV stays the same. This is equivalent-exposure conversion.
・Two locked — only one dial is left; turning it changes the EV. Use this to derive EV from a known combination.


■ Accurate by design

Labels like f/11 and 1/125 are photographic conventions, not exact values — f/11 is really 11.3137, and 1/125 is really 1/128.

Stopwise always calculates with exact powers of two and only rounds for display. That makes it more precise than mental arithmetic or a printed table.


■ Free version

・Aperture f1.4 – f22
・Shutter 120" – 1/4000
・ISO 100 – 1000
・1/3-stop increments
・The complete conversion engine and locking behaviour

The maths is identical in both versions. The free version is not crippled.


■ Pro (one-time purchase)

・Aperture extended to f0.8 – f56
・Shutter extended to 300" – 1/8000
・ISO extended to 32 – 102400
・Switch between 1/2 and 1/3 stops
・12 built-in scenes — pick one to set the EV directly
・Save up to 20 of your own scenes

No subscription, no ads, no data collection.


■ Privacy

Stopwise collects, stores and transmits nothing. No accounts, no analytics, no ad SDKs, and no permission requests at all.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Stopwise Pro | $1.99 | one-time |



## Version history (last 2 releases)

### 1.1 — 2026-09-11

Stopwise now tells the App Store about all ten of its interface languages, so the listing shows up in yours. The app itself is unchanged — same conversion engine, same offline operation, same ranges.

### 1.0 — 2026-09-01

No release notes.

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| [Photo Friend exposure and DoF](https://appshunter.io/ios/app/photo-friend-exposure-and-dof/id1198327295) | 4.1 (9) | Free | Photo & Video |
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## More apps by Zheng-Feng Chen

- [azEditor](https://appshunter.io/ios/app/azeditor/id6800469037)
- [azVoxbox](https://appshunter.io/ios/app/azvoxbox/id6807485974)
- [azVoxtrans](https://appshunter.io/ios/app/azvoxtrans/id6808918089)

All apps by Zheng-Feng Chen: https://appshunter.io/developer/6798600887

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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 2026-10-06.*