# MrMalty YC > iPhone app for calculating yeast starter sizes and brewing yeast requirements. (iPhone/iPad app by Noah Paci.) - Source: https://appshunter.io/ios/app/mrmalty-yc/id395067842 (this page in markdown: same URL + `.md`) - Developer: [Noah Paci](https://appshunter.io/developer/309198430) - Category: Lifestyle, Utilities - Price: $2.99 - Rating: 1.80/5 from 14 App Store ratings · 47 written reviews indexed - Age rating: 17+ - Requires: iOS 6.0 · 5 MB - Languages: American English - Released: 2010-10-02 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/mrmalty-yc/id395067842/reviews.md ## What is MrMalty YC? 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 www.mrmalty.com. Jamil's Books: * Yeast: The Practical Guide to Beer Fermentation: http://amzn.to/1mqQ1LS * Brewing Classic Styles: 80 Winning Recipes Anyone Can Brew: http://amzn.to/1u2ywuY ## Key features - Calculate starter sizes - Determine yeast quantity - Analyze stir plate effects - Calculate dry yeast rates - Assess yeast viability ## Recent user reviews (10 of 47) All indexed reviews: https://appshunter.io/ios/app/mrmalty-yc/id395067842/reviews.md ### 1/5 — Doesn’t work *2021-07-27* Can’t change starting gravity or volume. When I enter new number it always changes back to 1.048 and 11 gallons. ### 5/5 — Works great on iPad *2020-12-27* 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. ### 1/5 — What a waste of money *2020-11-30* Really nothing to this app. Hard to use not much too it a huge waster of money ### 5/5 — Works Great *2020-08-17* 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. ### 1/5 — Too simple *2020-05-21, version 6.5.0* Doesn’t allow dry yeast. Won’t allow multiple steps. Not worth the money. Disappointing. ### 1/5 — Unfortunately, no longer working *2020-02-19* 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. ### 1/5 — Terrible *2018-08-25* What a piece of rubbish. This app tells you nothing and is a total waste of money. Do not buy! ### 1/5 — Save your money *2017-03-04* This app does not give the same options or calculations that the website give. ### 1/5 — Waste of $ *2016-02-02* Don't waste your money! Free calculators do more than this worthless app. ### 1/5 — 😢 *2015-10-15* Read the reviews, or shall I say lack their of before you even consider purchasing this application! It seriously serves no purpose! ## Frequently asked questions about MrMalty YC ### What does the MrMalty YC app do? This app is designed to help brewers calculate the optimal size and quantity of yeast starters needed for their brews. It uses established proprietary formulas to ensure accurate yeast pitching rates. ### What are the key features of this app? Key features include calculating starter sizes, determining the amount of yeast required, assessing the effect of stir plates, calculating dry yeast rates, and evaluating yeast viability. It covers many aspects of yeast management for brewing. ### How much does MrMalty YC cost? The application is a licensed iPhone implementation, indicating it is a paid application. Specific pricing details would be available on the app store where it is listed. ### What kind of brewers is this app for? This app is intended for homebrewers and craft beer enthusiasts who want to ensure the health and success of their fermentation by precisely calculating their yeast needs. It's particularly useful for those who want to go beyond basic pitching rates. ### Is this app available on Android? The description specifically states that this is a licensed iPhone implementation. Therefore, it is currently only available for users of Apple's iOS operating system. ## Version history (last 5 releases) ### 6.5.0 — 2015-02-22 This app has been updated by Apple to display the Apple Watch app icon. * fix for hectoliters(there are 100,000ml in a hectoliter, not 1,000,000 as previously being used in the incorrect unit converter) ### 6.4.0 — 2014-12-04 * The mechanism of changing the pitching method for starters is to obscure, as such the following has been done ** Added a bit of jiggle to ALL icon's to draw attention to them when the app starts up to say: "CLICK ME" subtly. * Updated to accept non-decimal characters for decimals(some european countries use comma's instead. Any non-numeric character that is entered will be converted to a decimal prior to the conversion to the numeric value for caluculation) ### 6.3.0 — 2014-10-03 Bug fix related to internal representation of original gravity in plato even when user is using percent. Updated internal representation to store in percentage(e.g. 1.039). ### 6.2.0 — 2014-08-27 6.2.0 Release Notes Features Added --------------- * removed all but the most minimal of settings from the preferences screen as the functionality has been brought to main screen to facilitate easier use without flipping back and forth between tabs. * New Yeast Companies Added: Fermentis, LALLEMAND * ability to go beyond 100% for manually adjusted viability * secret buttons to increment/decrement the current viability basis(either date or percent)-just tap on the left and right sides of the horizontal space the includes the viability on the main screen. * added ability to change viability date on main screen * cancel/apply buttons for edits to original gravity, volume and viability(date or static percentage) on main screen * search of yeasts * change pitching methods on main screen between: dry, liquid and repitching UI Update -------- * added percent symbol to viability display * Updated yeast detail view to allow for longer descriptions that would not simply fit in the bottom area on small screen format devices Bugs Fixed ----------- * fixed static percentage bug(only allowed 99%, not 100%) * removed logging calls ### 6.1.0 — 2014-08-14 RELEASE NOTES FOR 6.1.0 release The 6.0.0 release had numerous bugs. This release does not address all of the suggestions in the comments it is being quickly submitted to fix described issues, and quickly provide a first pass at improving usability. More changes will come as comments are taken to their logical conclusions. In the meantime, keep the comments coming and if you are interested in being a beta tester please reach out to me privately. Also a feedback link has been added to the additional information page for future communication needs. Bug Fixes * viability calculation bug based on date fixed (thanks to @DaveDis, @Sig7686, @stevies phone) * store the harvest date if settings screen left without explicitly dismissing date picker(thanks to @DaveDis) * addressed some settings not causing recalculation on return to main screen(thanks to @wrizacked) * developer website was pointing to amazon instead of druidhillroad.com * fixed omission of first yeast in data files (WLP001 for example) - (bad sqllite db population script that started on line 2 instead of 1) * fixed issue with switch not triggering same viability basis logic as clicking on table row UI Updates * Better date format on settings * Updated defaults to match the website version * removed background, good design feedback(thanks @Slowjams) * added feedback link to additional information screen for emailing developer. * updated interaction when setting viability on settings screen to persist the changed value and use first tab to set the value before going into other pickers. * provided quick way to switch between fermentation types(the beer icon) on the main screen * provided quick way to switch between yeast pitching methods(the arrow icon) on the main screen * changed layout on iPad to show placeholders for different pitching methods. * displaying viability percentage and basis on main screen * removed barley from logo to get some visual space * flash the different fermentation type when changing under icon Coming soon in the next release.... * search function for yeast and associated yeast details * additional yeast information(e.g attenuation, fermentation temperatures, etc...) * mechanism to change viability date or percentage from main screen * additional ui enhancements to focus eyes on calculated values and calls to action * I will continue reading the comments and keep adding to this list... ## Apps similar to MrMalty YC | App | Rating | Price | Category | | --- | --- | --- | --- | | [SA BEAUTY MANAGER](https://appshunter.io/ios/app/sa-beauty-manager/id1633897180) | — | Free | Lifestyle | | [Rivals Barbershops](https://appshunter.io/ios/app/rivals-barbershops/id1660629140) | — | Free | Lifestyle | | [Vanlink](https://appshunter.io/ios/app/vanlink/id1638683440) | — | Free | Lifestyle | | [Polish - English Prayerbook](https://appshunter.io/ios/app/polish-english-prayerbook/id1637476760) | — | Free | Lifestyle | | [AMO World](https://appshunter.io/ios/app/amo-world/id1633862820) | — | Free | Lifestyle | | [(株)JAエコパル](https://appshunter.io/ios/app/ja/id1635276580) | — | Free | Lifestyle | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*