Comparison

ND+Timer vs James Owl Calc

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

Head to head
About

ND+Timer

This app helps photographers determine correct exposure times for long exposure shots using ND filters. It includes a timer to capture the perfect moment and offers pro features through in-app purchases for enhanced functionality.

Highlights
  • Exposure time calculation with ND filters
  • Integrated timer for capturing moments
  • Notifications while device is locked
  • Dark mode (Pro feature)
  • Lock screen widget with running timer (Pro feature)
  • Dynamic Island support (Pro feature)
  • Automatic exposure computation for multiple filters (Pro feature)
Features
Read full description

You are on a trip and would like to take a photo of a waterfall? Maybe You would like to take a long time exposure. ND+Timer gives you all the required capabilities to do filter photography. With ND+Timer you can always determine the correct exposure time for your photo. You can use the included timer feature to avoid missing the perfect moment. ND+Timer provides a lot of features: - Intuitive and clean app for photographers - Simple determination of exposure times with ND filters - Timer feature for taking photos - Notifications while device is locked ND+Timer is a freetime app project. To avoid annoying ads the app has some features available through in app purchases. Have understanding for this. Pro features (in app purchase): - Dark mode for the night - Widget with running timer on the lock screen - Support for the Dynamic Island - Hide unnecessary filters for clarity - Compute the exposure time automatically for multiple filters

About

James Owl Calc

This tool helps landscape photographers calculate precise camera settings for long exposure shots. It recommends ND filter combinations, aperture, and ISO based on your current settings and desired effect. Features include tutorials and camera-specific adjustments.

Highlights
  • Precise exposure calculations for ND filters
  • Reverse calculation mode
  • Smart adaptive technology for light changes
  • Built-in countdown timer with audio alerts
  • Camera-specific settings
  • Long exposure technique tutorials
Features
Read full description

James' Long Exposure Calculator is the ultimate companion for landscape photographers seeking to master the art of long exposure photography. Designed by professional photographer James Yu, this powerful tool eliminates guesswork and transforms your creative vision into precise camera settings. Whether you're capturing silky smooth waterfalls, dreamy misty seascapes, or ethereal cloud streaks, this app delivers professional-grade calculations tailored to your specific equipment. Simply input your current settings and desired effect, and the advanced algorithm will recommend the perfect ND filter combination, aperture, and ISO values to achieve stunning results every time. Key features include: Precise exposure calculations for any ND filter strength Reverse calculation mode - start with your desired exposure time Smart adaptive technology that accounts for changing light conditions Built-in countdown timer with audio alerts Camera-specific settings for maximum accuracy Detailed tutorials for various long exposure techniques Clean, intuitive interface designed for field use The app supports all major camera brands and ND filter types, from ND8 to ND64000. Take your long exposure photography to the next level with James' professional insights and techniques refined through years of experience. Whether you're a beginner exploring long exposure or a seasoned professional seeking efficiency, James' Long Exposure Calculator provides the precision and guidance you need to create breathtaking images that stand out from the crowd.

Screenshots

ND+Timer4 screens
James Owl Calc4 screens

Verdict

The call

The clearest difference is review sentiment: James Owl Calc at 100% against ND+Timer's 60%. James Owl Calc also leads on in-app purchases (none vs 1) and update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement 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

Both are free to download. ND+Timer sells 1 one-off in-app purchase. James Owl Calc asks for nothing beyond the download.

UpkeepUpdate frequency

ND+Timer ships an update every 2 months, James Owl Calc weekly. The most recent releases landed on October 7, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
ND+Timer versus James Owl Calc: the parameters behind the verdict, then further details
ParameterND+TimerJames Owl Calc
PriceFreeFree
Rating—5.0 (4 ratings) — better
Positive reviews60.0% of reviews100.0% of reviews — better
Number of ratings—4 — better
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.6 — better16.0
Further details — not scored
Size9 MB32 MB
Age rating4+4+
DeveloperTobias UllerichJames Zhen Yu

Customer experience

ND+Timer

Written reviews5 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

James Owl Calc

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

ND+Timer

One-time1
  • ND+Timer Pro$1.99
None

James Owl Calc

No in-app purchases

Questions

Is ND+Timer free?
ND+Timer is free to download, with in-app purchases available.
Is James Owl Calc free?
James Owl Calc is free to download, with no in-app purchases.
Do ND+Timer or James Owl Calc have ads?
Neither ND+Timer nor James Owl Calc shows ads.
Which is updated more often, ND+Timer or James Owl Calc?
ND+Timer ships an update every 2 months, and James Owl Calc weekly. Most recently, ND+Timer was updated on October 7, 2026 and James Owl Calc on September 22, 2026.

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