The grainmag companion app

grainmag Companion App

Meter and place your tones without a signal. No account, no internet required — just you, the light, and the grain.

测试期间免费 · €9.99 正式发布后一次性付费 · 无订阅，无需账户，完全离线可用。

grainmag mapping a frame into Zones, region by region

New · on-device AI

A composition advisor that thinks on your phone

Shoot or pick a frame and grainmag reads the light — region by region — then talks through the composition and proposes where to place your key tones. A compact AI model runs entirely on the device: no cloud, no account, nothing ever uploaded.

Reads the frame in zones: It maps every part of the frame to its Zone — the same 0–X scale you meter by — so the advice is grounded in the tones actually in front of you.
Talks composition, not exposure math: Balance, leading lines, subject weight, where the tones fall. It speaks qualitatively and never invents an f-stop or EV — the numbers stay with the meter.
Suggestions you can tap to apply: Each tip is live: tap “Place top-center on Zone VI” and the metering engine recalculates the whole tonal range around that placement.
Runs fully offline — and private: The model lives on your phone. No connection, no account, no frame ever leaves the device. Works in a darkroom, a canyon, or aeroplane mode.

Available on supported Android devices (roughly 6 GB of RAM and up). iOS support is planned.

Composition

No notes — hang it in a museum

功能介绍

Six hand-built tools for working the Zone System in the field — plus the advisor above. Every one runs offline.

Zone Scale

An interactive reference of all 11 zones (0–X), from pure black to pure white. Slide the N+/N− development control to see how each zone shifts with expanded or contracted development.

Exposure Calculator

Dial in aperture, shutter speed, and ISO to see the resulting EV and the zone it maps to. Apply ±EV compensation and get the adjusted shutter speed instantly.

Zone Placement

Choose where your meter reads and where you want it in the final image. The app calculates the stop offset and shows how the whole tonal range shifts.

Reciprocity Correction

Corrected long-exposure times for 11 film stocks — Tri-X, T-Max, HP5 Plus, FP4 Plus, Delta, Acros II, Fomapan and more — with a quick-reference table.

Filter Compensation

Select contrast filters, ND filters, or a polarizer and see the total stop adjustment applied to your base shutter speed.

Live Zone Overlay

Shoot or pick a photo and the app maps every region to its zone — tap any cell to read its tone, then dial EV and development to watch the whole scene shift.

申请测试资格

grainmag Companion App 正在 Google Play 进行封闭测试。留下您的信息，我们将把您添加到测试名单，然后通过邮件发送加入链接。请使用与您 Google Play 账户相同的邮箱。

1. 您在上方提交您的信息。
2. 我们将您的邮箱添加到 Google Play 封闭测试名单。
3. 我们通过邮件发送加入链接——点击链接，安装，即可加入。