Check out Annotable, the all in one annotation app, at http://moke.com/annotable/.
Annotable can be downloaded from the Apple App Store:
Annotable allows you to annotate an image, with a variety of features.
- Crop the image
- Blur parts of the image
- Add Text to the image
- Draw on the image
- Place arrows on the image
- Draw a box around an area
On the free version of the app, only red annotations can be made. To use colours and add additional features an in app purchase can be made for £7.99. Users can try the premium features, however a ‘£’ will watermark the image.