Hi, I just registered, but have been lurking for awhile. I wanted to offer some input regarding the Android apps ChastiKey and Time Lock for Images.
Things I like about ChastiKey: variable timer (you can tell it to set a random timer within a range) , opportunities to escape sooner (can be disabled), and use by self or by a keyholder. Intuitive interface, easy to use.
Things I don't like: the app gives you a number to set in your combination lock (you tell it the number of digits your lock has). After it shows you this number, it then goes into this routine of displaying hundreds of random numbers, theoretically distracting you so you forget the number you used to set your lock. I find that once I've taken the time to set the number in the lock, it is imprinted in my memory and I am unable to forget it just by watching random numbers flash up on the screen. This does not work for me for self-keyholding.
Things I like about Time Lock for Images: Can add time to the timer file. Can hide the center of the image while taking a photo of your lock, so you can still tell if the image is sharp but you can't see the lock digits. Can share the image.
Things I don't like: can't generate a random time. Can't be 100% certain that the lock combo will be clear enough to read.
My thoughts: I really would prefer to use ChastiKey but I would need someone else to set the lock combo so I can't see what it is. That is a significant enough problem for me to not use it by myself. With Time Lock for Images, I have to have enough discipline not to look at the locks after I have randomly and blindly reset the combos, while taking the photo and while getting ready to close the lock and spin the combo. For me, this works. If I glance and see even one digit of the 4-digit combo, I go thru the reset and photo procedure again. Once the photo is taken and the locks are in place, I can then take my time in establishing my desired wait time. Time can be set in days, hours and minutes, up to 999 days. If I could get past the main problematic issue I have with ChastiKey, I would prefer it because it allows hidden variable timers so I would not know when I could unlock (within user-identified parameters). Time Lock for Images always shows a countdown timer for when the image will be available.
My experience with the images taken for the Time Lock app is that they are plenty clear as long as you take care when taking the image. Even with the center of the image hidden, you can see enough around the perimeter to tell whether or not the image is sharp. The app assesses the clarity of the photo image and will show a bar graph estimating the percentage of sharpness of the photo. If the percentage says 100%, I have high confidence that the digits will be readable.
Just my 2 cents FWIW.