ND Slow Shutter vs Stopwise

Master Long Exposure Photography with Ease ND Slow Shutter helps you calculate the perfect shutter speed when using Neutral Density (ND) filters—so you can focus on creativity, not math. Key Features • Instant Calculations — Enter your base exposure and ND filter strength (ND1–ND20) to get precise results in seconds • Built-in Timer — Stay in control during long exposures with an optional countdown timer • Simple & Intuitive — Clean, fast interface designed for photographers of all levels • Apple Watch Support — Control your exposures and timer directly from your wrist (Premium) Why ND Slow Shutter? • Accurate Results — Reliable calculations you can trust in the field • Faster Workflow — No guesswork, no manual conversions • Shoot with Confidence — Focus on composition while the app handles the math Whether you’re capturing silky waterfalls, smooth seascapes, or motion blur, ND Slow Shutter gives you the precision and control you need. Download now and elevate your long exposure photography.

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.