iPhone Screenshots


NDTimer is an iPhone App useful for calculating and timing long exposures when using one or two neutral density (ND) filters.

What’s New

Version 2.7

Start button appears on app launch if last used settings permit

Ratings and Reviews

3.5 out of 5
2 Ratings

2 Ratings

Maplhgr ,

Developer very helpful.

Had the same issue as others and notified developer. Fast professional response. Did a little troubleshooting and determined that the timer would not stop ONLY if you failed to acknowledge the notification to "close your shutter" if phone went to sleep while it was timing. Provided this feedback and this issue was fixed with an update promised in a couple of days. So until then make sure you acknowledge that notification popup and all will be fine. Very happy with the app AND the response of the developer.

FurTheYonko ,

Love this App!

Fantastic app that allows me to focus on setting up my camera/filter, composition, etc -- instead of calculating exposure times manually. Contrary to the previous review I find the app to be very accurate regardless of what brand ND filter I use (Hoya or Lee) as it works off of stops not the particular brand type. Furthermore, you can easily adjust exposure in 1/2 stop increments by swiping the timer if you feel it is necessary either to compensate for your metering technique or for reciprocity failure when using film.

Gre8bazaar ,


I usually don't write a review. This app is great. Usually lee big stoppers come with a table. I had Hoya and did not have a timer table. This worked amazing. The only problem I had was it underexposed by one stop. So once the adjustment was made it was all fine. May be it was to do with my Metering technique.


Threesixty Digital Design Co.
13.8 MB
Photo & Video

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Threesixty Digital Design Co.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.