ND Filter Calc vs ND Slow Shutter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ND Filter Calc
This tool helps photographers calculate neutral density filter effects on their camera's exposure. It includes a countdown timer for long exposures, simplifying the process of achieving desired results.
- Neutral density filter calculation
- Exposure compensation
- Long exposure timer
- Countdown for shutter speeds > 3 seconds
- Simple interface
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A simple neutral density filter calculator for photographers. Has a count-down timer for shutter speeds of 3 seconds and above.
ND Slow Shutter
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: ND Filter Calc at none against ND Slow Shutter's 1. ND Filter Calc also leads on ads (none vs shown) and update cadence (every 6 days vs every 3 weeks). On price and device support 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
Both are free to download. ND Slow Shutter sells 1 one-off in-app purchase. ND Filter Calc asks for nothing beyond the download.
ND Filter Calc ships an update every 6 days, ND Slow Shutter every 3 weeks. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.
| Parameter | ND Filter Calc | ND Slow Shutter |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 6 days — better | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 47 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Jerry Watson | Francesco Foianesi |
In-app purchases
ND Filter Calc
No in-app purchases
ND Slow Shutter
- Premium Version$2.99
Questions
Is ND Filter Calc free?
Is ND Slow Shutter free?
Do ND Filter Calc or ND Slow Shutter have ads?
Which is updated more often, ND Filter Calc or ND Slow Shutter?
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