--- title: "Zone Tool - Reviews, Revenue and Downloads in United States | Apple App Store" 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 " --- # Zone Tool — United States > Zone system calculator ![Zone Tool App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/96/3b/42/963b4288-b853-81f8-1d8c-239c7ae5512a/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png) **Developer:** [Jouni Erola](https://apptail.io/developer/jouni-erola-hZp) (Finland) **Category:** Photo Video **Rating:** 2.8/5 (6 ratings) **Price:** $0.99 **Bundle ID:** com.miituu.zonecalc **Store:** Apple App Store **Country:** United States **Version:** 1.2 (released 2026-03-03) **Original Release:** 2019-11-29 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1489637620) **AppTail Page:** [https://apptail.io/app/zone-tool-sBYc/united-states](https://apptail.io/app/zone-tool-sBYc/united-states) ## Zone Tool 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 Tool Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/a4/ad/bf/a4adbfe7-869a-8130-fbe3-66f90ba24f97/pr_source.png/1242x2688.png) ## Zone Tool Rating Breakdown in United States - 5 stars: 1 (17%) - 4 stars: 2 (33%) - 3 stars: 0 (0%) - 2 stars: 1 (17%) - 1 stars: 2 (33%) ## Zone Tool Reviews in United States ### ****- "Pretty good overall" If it is possible, adding the adjustment for shutter speed instead of only the aperture will be so much helpful. -- Kihgfdsal, 2022-02-21 [View all Zone Tool reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## Zone Tool Discovered Keywords - zone tool ## Apps Similar to Zone Tool - [Pocket Light Meter](https://apptail.io/app/pocket-light-meter-ZH/united-states) - [Long Exposure Calculator](https://apptail.io/app/long-exposure-calculator-fUd/united-states) - [Mark II Artist's Viewfinder](https://apptail.io/app/mark-ii-artists-viewfinder-eZd/united-states) - [Art of Foto](https://apptail.io/app/art-of-foto-Cpzb/united-states) - [Pinhole Assist](https://apptail.io/app/pinhole-assist-fnIb/united-states) - [myLightMeter PRO](https://apptail.io/app/mylightmeter-pro-SOfc/united-states) - [Reciprocity Timer](https://apptail.io/app/reciprocity-timer-yqNc/united-states) - [Massive Dev Chart Timer](https://apptail.io/app/massive-dev-chart-timer-yyed/united-states) - [Lightme - Logbook](https://apptail.io/app/lightme-logbook-qULd/united-states) - [Zone System](https://apptail.io/app/zone-system-RfRv/united-states) ## Zone Tool Available In - [United States](https://apptail.io/app/zone-tool-sBYc/united-states) - [Thailand](https://apptail.io/app/zone-tool-sBYc/thailand) - [Australia](https://apptail.io/app/zone-tool-sBYc/australia) - [Azerbaijan](https://apptail.io/app/zone-tool-sBYc/azerbaijan) - [Brazil](https://apptail.io/app/zone-tool-sBYc/brazil) - [Canada](https://apptail.io/app/zone-tool-sBYc/canada) - [China](https://apptail.io/app/zone-tool-sBYc/china) - [Colombia](https://apptail.io/app/zone-tool-sBYc/colombia) - [Dominican Republic](https://apptail.io/app/zone-tool-sBYc/dominican-republic) - [Algeria](https://apptail.io/app/zone-tool-sBYc/algeria) - [Ecuador](https://apptail.io/app/zone-tool-sBYc/ecuador) - [Egypt](https://apptail.io/app/zone-tool-sBYc/egypt) - [Hong Kong SAR China](https://apptail.io/app/zone-tool-sBYc/hong-kong) - [Indonesia](https://apptail.io/app/zone-tool-sBYc/indonesia) - [India](https://apptail.io/app/zone-tool-sBYc/india) - [South Korea](https://apptail.io/app/zone-tool-sBYc/south-korea) - [Kuwait](https://apptail.io/app/zone-tool-sBYc/kuwait) - [Lebanon](https://apptail.io/app/zone-tool-sBYc/lebanon) - [Mexico](https://apptail.io/app/zone-tool-sBYc/mexico) - [Malaysia](https://apptail.io/app/zone-tool-sBYc/malaysia) - [New Zealand](https://apptail.io/app/zone-tool-sBYc/new-zealand) - [Peru](https://apptail.io/app/zone-tool-sBYc/peru) - [Philippines](https://apptail.io/app/zone-tool-sBYc/philippines) - [Pakistan](https://apptail.io/app/zone-tool-sBYc/pakistan) - [Saudi Arabia](https://apptail.io/app/zone-tool-sBYc/saudi-arabia) - [Singapore](https://apptail.io/app/zone-tool-sBYc/singapore) - [Taiwan](https://apptail.io/app/zone-tool-sBYc/taiwan) - [South Africa](https://apptail.io/app/zone-tool-sBYc/south-africa) - [Argentina](https://apptail.io/app/zone-tool-sBYc/argentina) - [United Arab Emirates](https://apptail.io/app/zone-tool-sBYc/united-arab-emirates) - [Vietnam](https://apptail.io/app/zone-tool-sBYc/vietnam) - [Brunei](https://apptail.io/app/zone-tool-sBYc/brunei) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*