I’ve posted at some length previously regarding extraction, TDS, meters and all that. I daresay I may become typecast in the role of extraction curmudgeon. That said, the Extract Mojo software and refractometer have become as much a part of my coffee toolset as my grinder, or kettle. However, the economy of the meter and software has been the one area I have had some concern. Ideally, everyone could afford the package, and we could all move forward, industry and consumers, both understanding how to get to where we want to be. Job done. The price barrier has been formidable for all but the most devoted consumers, and even, I imagine, for plenty of small coffee shops and roasters. The path to widespread adoption has not looked to be a speedy one.


Last autumn, I had a number of really interesting conversations with Vince Fedele regarding extraction, TDS meters, conductivity vs refraction among other things. At this time I had the coffee meter. Shortly after, Vince asked if I would consider taking part as a beta-tester for his new iPhone based “universal refractometer” software. And here’s the kicker, it would not only perform a lot of the analysis functions of the Windows based software, it would also allow me to use my Coffee meter for measuring espresso TDS (or vice versa – had I the espresso meter).

This amazed me. It turns out the two meters have the same ability to measure refractive index, but due to limited memory on the meters, conversion tables for both espresso and coffee cannot be accomodated. What once was quite a big expense for 2 meters and the windows software, had instantly become a more reasonable single meter and iPhone app.

photoThe basic premise is that instead of reading the TDS value from the meter, you switch to nD mode (nD = refractive index), and by inputting the nD and temp (also read by the meter) into MoJoToGo, you get the TDS. Similar to the original software, the TDS is combined with the coffee and water doses (or in the case of espresso – beverage weight) to get you to extraction %.


There are plenty of other functions that are interesting, like saving recipes, sending recipes via email, geotagging, not to mention extended usage into Brix territory (home brewing anyone?). It’s probably beyond the scope of this blog post to adequately discuss all the features, so instead I’ll point you towards the new home of all things MoJo…

I can sum up my feelings on MoJoToGo thusly; in the time I’ve had the app, I’ve only used the Windows version maybe twice. The iPhone app is always there, in my pocket, ready to go in a second.


8 thoughts on “MoJoToGo

  1. Love it! Thanks for the tip! Downloaded, and just inputted my first brew. Not having Windows at all has really hampered the usefulness of this ExtractMojo refractometer… now it’s brilliant!!!

  2. Chris C says:

    Well, this was not what I was expecting to read first thing this morning. As they say in the movies, “Shit just got real.” My only reservation here is that this may be a very cruel April Fool’s joke. 🙂

    So from what I can gather after a furious five minutes crawling through the site, costs are as follows:

    – refractometer $359 (either coffee or espresso, doesn’t matter now, you can use either one to measure both), although the site says it will work ‘with any refractometer displaying refractive index and temperature or any existing Coffee Refractometer displaying % TDS to 0.01%. Accuracy required: +/- 0.0001 nD or better; 0.1 Deg C or better,’ so I suppose it’s possible there are cheaper options out there. Having used their refractometers before though, I’d be highly inclined to just go with theirs.

    – App: free for calibration mode (used with distilled water to calibrate your refractometer). Espresso mode and coffee mode are $29.99 each, in-app purchases.

    Grand total cost for measuring both espresso and coffee: $418.98, plus I guess some shipping for the refractometer. BUT consider that this also means you now don’t need a PC either, as many shops don’t have one.

    Additionally, the just-released Extract MoJo 2.0 includes the capability to use only one refractometer now (either the espresso or coffee one) to measure both, thus dropping the price of the full coffee and espresso bundle to $599. And you can upgrade the software from either the espresso or coffee version to the v2.0 full coffee & espresso version for $99.

    Wow. And on top of all this is the coolness of having the software in my pocket. I’m jealous you’ve had it for so long, David!

  3. Chris – I assure you, no April Fool’s, though I did say to Vince that if he releases this on April 1st, some people would draw that conclusion.

    • Chris C says:

      Well, having downloaded the free version and checked it out a bit, plus extensively combed the website, it would have to be a pretty elaborate hoax at this point if it was one. 🙂

      Seriously though, this is the most exciting thing I’ve seen in coffee in the last year, since the release of the original Extract Mojo.As you’ve noted, perhaps the lower entry price will finally convince some that have held back so far to take the plunge.

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  7. Simon Johnson says:

    Im new to brewing and have just downloaded the app and paid for the lite version.

    Is there a step by step beginners guide to using th app?

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