Zone Tool vs Zone System
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zone Tool
Calculate photographic exposure and development adjustments using zone system theory. Measure shadows and highlights, input film ISO and desired shutter speed to determine aperture and development time modifications.
- Zone system exposure calculation
- Shadow and highlight measurement
- Film ISO input
- Shutter speed adjustment
- Development time calculation
- Aperture determination
Read full descriptionHide full description
With this tool you can calculate your exposure and needed adjustment for development. It uses zone system theory originally invented by Ansel Adams and Fred Archer. First decide zone of your shadows and measure the shadows. Then device highlight zone and measure the highlights. Measure these with the film ISO you are going to use. You also need to decide shutter speed in beforehand. The app calculates exposure aperture for you and also tells if you need to shorten (N+..) or expand (N-..) your development time. You will get best results with a spot light meter but mobile apps will probably do fine.
Zone System
This tool simplifies Ansel Adams' exposure and development method for photographers. It helps measure shadows and highlights, calculate aperture and development times, and preview results with film stock presets.
- Measure shadows and highlights
- Aperture and development calculations
- Preview results with film presets
- ISO and EV calculations
- Simplified Zone System application
Read full descriptionHide full description
Zone System is a practical tool for applying Ansel Adams’ exposure and development method. • Measure shadows and highlights to set exposure • Get aperture and development (N, N+, N–) calculations • Preview results with film stock presets • Get calculations for aperture, shutter speed, ISO, and EV This app makes the Zone System simpler, faster, and more reliable.
Screenshots
Verdict
The clearest difference is rating: Zone System at 5.0 against Zone Tool's 2.8. Zone System also leads on update cadence (every 9 days vs every 38 months) and device support (4 vs 2). Zone Tool's advantage is price ($0.99 vs $1.99) and iOS requirement (12.2 vs 17). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Zone Tool costs $0.99 and Zone System $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Zone System holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Zone Tool ships an update every 38 months, Zone System every 9 days. The most recent releases landed on August 24, 2026 and September 13, 2026 respectively.
| Parameter | Zone Tool | Zone System |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 2.8 (6 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 6 — better | 3 |
| Update frequency | Every 38 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #197 | #192 — better |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch, Vision Pro — better |
| Requires iOS | 12.2 — better | 17 |
| Further details — not scored | ||
| Size | 0 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Jouni Erola | Davin Nguyen |
Customer experience
Zone Tool
Zone System
In-app purchases
Zone Tool
No in-app purchases
Zone System
No in-app purchases
