This is a great app. I've also been looking for a better image search for iPhone.
The only thing that I think could be improved - allow loading original images in the search results. If you are using iCloud to store the images then only the small cached versions are returned.
In the latest version, you can run the app to network in order to download iCloud photos, but this will only happen when.
1. the photo is indeed stored in iCloud
2. Your search results include this photo
3. You went to the photo details page and clicked the Download from iCloud icon
Only then will Queryable request network permissions in a pop-up window. After granting it, you kill the app, reopen it, and it will automatically download from iCloud.
The only thing that I think could be improved - allow loading original images in the search results. If you are using iCloud to store the images then only the small cached versions are returned.