Entering title on a photo or a series of photos on IOS
You might be interested in the 500px app.

Here is information from them how to modify the EXIF in photos.


  If your photo has EXIF data included in the file, it should be
  automatically added when you upload it. If this does not work for you,
  please email help@500px.com and include the photo that you're having
  troubles with.
  
  If your photo does not include EXIF data or you wish to manually edit
  it, follow these directions:
  
  
  Login to 500px.com
  Go to your Organizer.
  Hover over the thumbnail of the photo you’d like to adjust and press Edit.
  On the right hand side of the edit screen, there are fields for the Meta/EXIF data. These fields are automatically filled if the
  information is available.
  Edit this data, and then press Save at the bottom of the page.
  
  
  Step by step visual guide: