Comparison

NDCalc2 vs Luma Calc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NDCalc2

Calculate correct exposure times when using ND filters for long exposures. Easily manage your filter collection, add custom filters, and switch between single and multi-select modes for stacking.

Highlights
  • Calculate exposure time with ND filters
  • Supports iPhone 5/s/c screens
  • Multi-Select Mode for filter stacking
  • Add custom ND filters
  • Delete and reorder filters
  • Countdown timer for long exposures
Features
Read full description

Screenshots are german but it's translated to english too. This is a completely rewritten Version of NDCalc - now called NDCalc2. It's all new with these great features: - build for iOS7 - supports the 4" Screens of iPhone5/s/c - supports retina - Much more comfortable selection of shutter speed and NDFilter (no wheel control) - Multi-Select! Finally! You can switch to Multi-Select-Mode with a single tap in the toolbar if you are a ND-Filter-Stacker like myself :) Just activate Multi-Select-Mode and tap on any Filter you have stacked to the lens for really long exposures. - Add your own Filters! Finally! You own a filter which is not listed in the default list? Just add it by f-stops, ND-Value or Factor. - Delete Filters. Just delete all filters you don't own and make selecting filters much more convenient - Reorder Filter. Order the Filter-List as you like it. Bring up the most used filters to the top of the list. The core function is still the same as NDCalc: You know the time without the filter -how long do you need to exp. WITH filter? Sounds easy but tell me quickly how long to exp. with an ND 1.8 if the time without filter is 1/320? Now you can! Set Filter and exp. time without the filter and you can see the correct time. In the example above 1/5 Even easier it shows you 5 because this is what you can set on a dSLR. Smaller letters showing you the actual time. For 12500'' it shows, that these are 3h, 28m and 20s. For times of 4+ seconds you get a countdown button to easily stop longer exposures manually with a remote shutter release with alarm and vibration (if supported).

About

Luma Calc

Features
Read full description

LumaCalc is an exposure calculator for photographers and videographers. Change your aperture, ISO, ND filter, or EV compensation — LumaCalc instantly tells you the exact shutter speed needed to maintain a correct exposure. No more mental math on set. ◆ Perfect for - Photographers who attach ND filters and need to recalculate shutter speed every time - Long exposure shooters who want to know the exact duration before pressing the shutter - Anyone who adjusts aperture or ISO and needs a quick exposure correction on the fly - Studio, outdoor, and video shooters who need fast, reliable settings ◆ Features [Exposure Triangle Calculator] Enter your current camera settings (aperture · ISO · shutter speed), then set your new values. The correct shutter speed is calculated in real time — no confirm button needed, results update instantly as you scroll. [ND Filter Calculator] Supports 23 ND filter densities from ND0 (no filter) to ND512K (512,000× light reduction). Instantly see the required shutter speed for any filter you attach. [EV Compensation] Apply exposure compensation from -3.0 to +3.0 EV in 1/3-stop increments to fine-tune your results. [Long Exposure Display] Results beyond 30 seconds are automatically formatted so you always know exactly how long to hold the shutter open. - 1/8000s – 30s : Standard shutter value (e.g. 1/250) - 30s – 60s : Seconds (e.g. 45s) - 1 min – 1 hour : MM:SS format (e.g. 02:30) - Over 1 hour : HH:MM:SS format (e.g. 01:30:00) [Wide Setting Range] - Aperture: f/1.0 – f/32 (1/3-stop steps, 31 values) - ISO: 50 – 80,000 (1/3-stop steps, 33 values) - Shutter speed: 1/8000s – 30s (56 values) ◆ Designed for the Field - Dark theme: easy on the eyes in low-light shooting environments - Wheel picker: drum-roll style selector for fast, precise input - Haptic feedback: feel every click as you scroll through values - Out-of-range alerts: clear Too Fast / Too Slow warnings when results exceed camera limits Stop doing exposure math in your head. Set up your shot faster and more accurately with LumaCalc.

Screenshots

NDCalc24 screens
Luma Calc2 screens

Verdict

The call

The clearest difference is price: Luma Calc at Free against NDCalc2's $0.99. NDCalc2's advantage is iOS requirement (7.0 vs 13.0). On update cadence, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Luma Calc is free to download; NDCalc2 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

NDCalc2 ships an update every 10 months, Luma Calc every 7 months. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.

Scorecard2 real differences · 8 level
NDCalc2 versus Luma Calc: the parameters behind the verdict, then further details
ParameterNDCalc2Luma Calc
Price$0.99Free — better
Rating1.5 (2 ratings) — better—
Positive reviews47.1% of reviews—
Number of ratings2 — better—
Update frequencyEvery 10 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS7.0 — better13.0
Further details — not scored
Size20 MB19 MB
Age rating4+4+
DeveloperBoris Nienkeyeongsu son

In-app purchases

None

NDCalc2

No in-app purchases

None

Luma Calc

No in-app purchases

Questions

Is NDCalc2 free?
NDCalc2 costs $0.99, with no in-app purchases.
Is Luma Calc free?
Luma Calc is free to download, with no in-app purchases.
Do NDCalc2 or Luma Calc have ads?
Neither NDCalc2 nor Luma Calc shows ads.
Which is updated more often, NDCalc2 or Luma Calc?
NDCalc2 ships an update every 10 months, and Luma Calc every 7 months. Most recently, NDCalc2 was updated on November 11, 2026 and Luma Calc on November 4, 2026.

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