MrMalty YC
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New app to calculate stepped starters coming in sprint 2015.

This is a licensed iPhone implementation of the Mr. Malty Pitching Rate Calculator. It can calculate starter sizes, amount of yeast required, the effect of stir plates, dry yeast rates, yeast viability,and lots more. It uses the same proprietary formulas as the calculator on

Jamil's Books:

* Yeast: The Practical Guide to Beer Fermentation:
* Brewing Classic Styles: 80 Winning Recipes Anyone Can Brew:
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User Rating

1.85 out of 5

13 ratings in United States

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Ratings History


Doesn’t work

JJD3J on

Can’t change starting gravity or volume. When I enter new number it always changes back to 1.048 and 11 gallons.

Works great on iPad

Reg7790 on

Well worth the $2.99. I’ve been using the desktop version that requires Abode Flash since it was developed. With Abode Flash being discontinued I bought this and it’s just as good as the desktop version.

What a waste of money

Jackied20 on

Really nothing to this app. Hard to use not much too it a huge waster of money

Works Great

Semco on

I’m not sure why everyone has low rating of this. I find it works great, been using on my iPhone for years. Life saver when you’re at the store and find all they have is older yeast.

Unfortunately, no longer working

bob_no_dogma on

I have had this app for years, just started brewing again, and the app no longer functions. It was a great app contributed by Jamil, when there were few alternatives to doing it by hand. Fortunately, there are lots of other tools now available. I would recommend Brewfather which has a broad home brew capability, including yeast starter calculations.


Jill1978 on

What a piece of rubbish. This app tells you nothing and is a total waste of money. Do not buy!

Save your money

InnerSpark on

This app does not give the same options or calculations that the website give.

Waste of $

PeculiarB on

Don't waste your money! Free calculators do more than this worthless app.


Sarswmmr16 on

Read the reviews, or shall I say lack their of before you even consider purchasing this application! It seriously serves no purpose!

Not Worth the $2.99.

Homebrew Joe on

Save your $. There are better yeast calculator apps available that allow multiple starters to get you where you need to be, especially for big beers. Checkout Yeast Pitch. Great app and worth the price.

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App Info

Noah Paci
Recent version
6.5.0 (8 years ago )
Released on
Oct 2, 2010 (13 years ago )
Last updated
3 days ago