Eventually I found a possible reason of this mismatch.
First thing to say, with fix solution there is no difference in lat/lon, but only in altitude.
It seems to me that Mobile Topographer Pro misunderstands the NMEA $GPGGA string.
In this string there is an altitud above ellipsoid and a correction to add to obtain MSL. On the contrary, what I see in Mobile Topographer is a MSL corrected subtracting this correction. For this reason the above MSL in Mobile Topographer and in ReachView App differ that much.
If anyone can confirm my supposition, I would be grateful.
The version of Mobile Topographer Pro I am using is 10.9.0.
Iām seeing the same sort of thing - mobile topographer pro was reading 32.3m higher than reachview. Have you found a work-around?
Master survey 2016
Relase info - Introducing SURVEY MASTER by ComNav Technology ! GNSS T300 driven by your SmartPhone ...
App - https://play.google.com/store/apps/details?id=com.sinognss.sm.free&hl
Just gonna tip you about this app, similar to the above but havent testet it up with reach yet.
On phone with gps it looks promising.
Well. the above app, Master survey 2016 does not work properly.
I managed to connect via bluetooth but no coordinates were displayed. Tried different output solutions but no luck.
i have the same problem, when i use the mobile topographer, the altitude is different beetween reach appview and mobile topographer and ntripclientā¦
why?
There could be several reasons. Is your ntrip provider using ellisoid or geoide, have you adjusted pole offset, is device elevation set in mobil topographer. Is geoid close to ellipsoid
My last survey with ntrip correction from a VRS base 5km away, gave my a height farely close to correct height above sea level. MSL on topograph was wrong and alltitude showing my the correct one.
I think SurveyMaster is only compatible with their own T300 receiver. Thatās often the case that the field software is only compatible with the manufacturerās own receivers.
Has anybody on this forum successfully used the survey app Topview for Android with Reach. It appears to be a complete professional surveying data collector with line work tools. Itās not free but there is a demo version and the license can be purchased for a daily rate 
I spent some time looking at it this afternoon and thought Iād see if anyone else has any experience with it. The line work part is what appeals to me. Thanks
I do not but will try and take a look.
Thanks for the response. If you canāt find it on the Play store check out http://www.topview.es/android.html
Iām not even sure if itās compatible with Reach.
Been looking for one of these as well, the one you linked seem to be spanish only however (or well, really poor translations to english, at least). I did find something else that looks fairly promising for what I need: https://play.google.com/store/apps/details?id=np.com.softwel.swmaps&hl=en They also seem to have given a though about the UX and how the app actually looks, same cannot be said for the TopView oneā¦ 
Going to give it a try this weekend.
Cool, thanks! Lefebure can also receive corrections from NTRIP, but we do not support input of correction trough bluetooth yet
Bluetooth with input/output correction out in Reachview 2.5.0. Go nuts
https://docs.emlid.com/reach/common/reachview/changelogs/
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Way ahead of me 
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SuperSurv 10 is working with Reach/RS
https://play.google.com/store/apps/details?id=com.supergeo.asd.supersurvlite.SuperSurv10
And you dont need Lefebure, you can just connect via BLuetooth setting in SuperSurv.
Now, it states 7 days trial, but i never got that option to work so i cant say anything about the functions
Anyone bought this or manage to get the trialperiod to work?
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SuperSurv has trialmode if you download from their website and signing up.
http://www.supergeotek.com/index.php/products_supersurv/
How to connect Reach to SuperSurv via bluetooth
Edit
Connection over TCP also work between SuperSurv and Reach.
That is actually a nice feature. Less battery is consumed
Edit: And TCP connection
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Hi there!
Just wanted to mention here for those who can find this old topic that now we have the ReachView 3 app.
Feel free to try the app with your Reach receiver and share feedback with us in a new thread 