The CamBugs Apps (search in the App Store on iPhone/iPad) are based on the principles of Expanded Rehearsal Technique (ERT) so children can carry out the intervention at home very easily. Apps don’t have to be used consecutively, so a young person struggling with CamBugs 2 (digraphs and trigraphs) can still do CamBugs 3 (high frequency words).
Oxford Owls are offering e-books free (Oxford Reading Tree, Read Write Inc and a few others) which is fantastic as you can choose them by phonics phase OR reading age.