Curious about this too. Also, what's the stack providing Tesseract-as-a-Service? According to my cursory search, Google app engine won't run Tesseract as its a native library, not an API. I'd like to try this on non-Latin/CJK hardcoded subtitles, but ocrat does latin only.
I wrote a little C program that uses TessBaseAPI to extract letter locations which gets triggered with ImageMagick's convert by a NodeJS script. The app engine frontend which acts as a caching reverse proxy.
