Creative coffee roasting is an art. The key lies in leveraging both your triumphs and mistakes, and visualizing how all of your data works together to affect the final taste. Designed for specialty and prosumer roasters alike, Roastmaster paints the bigger picture. It enhances and speeds your workflow, compounding your achievements on your way to that consistently perfect cup!

Learn from the past and build a future:
Set a roadmap from any profile or roast with just a tap
Track any number of roast curves: control or temperature
Target, inspect, and monitor data in the interactive analyzer
Stay on course with delta curves, level indicators, and temperature projections
Never miss a milestone with alarms, set-point alerts, and temperature trigger notifications
Save any roast as a profile, and build a custom library tailored to style or bean
View interactive roast log reports to compare metrics like drying time, development percent, moisture loss, and many others
Create roaster maintenance schedules to be reminded when individual tasks are due, and log details like service time and costs

Keep your green bean inventory in sync with your actual stock — automatically:
Beans or blends – let Roastmaster do the bean counting for you!
Set order reminders to alert you of low inventory
Record details like country, trade, processing, and more
Track lot details such as age, cost, moisture, Q Score, and more
Audit inventory and lot shipments with advanced reporting

Get creative concocting, tasting, and perfecting your signature blends:
Blend green beans or roasts by weight or percentage
Create "snapshot" experiments and track your results
Roasting a blend? Let Roastmaster calculate the green weights

Rate a morning pot of drip coffee, or score a professional cupping session:
Record extraction time, brew ratio, grind settings, and more
Score traditional attributes like aroma, body, and acidity with multiple cupping styles
Enter scores easily with interactive spider graphs
Visualize how cupping scores relate to all aspects of your workflow

The Data Logging in-app purchase allows you to connect one or more thermocouples to automate your roasts. Roastmaster displays and records real-time temperature readings from each probe. When paired with Roastmaster’s other automation features, roasting becomes truly hands-free!

Reports, labels, sharing – if it’s aimed at great tasting coffee, you can bet it’s in there or we’re working on it! For a complete guide and walkthrough, please visit:

What’s New

Version 11.0.0

iOS 11 support
Ability to hide master split view
Automatic Data Logging enhancements:
• Santoker Bluetooth LE roaster
• Phidgets Library 22 and VINT devices
• Phidgets RTD probes (VINT)
• RBP Bluetooth LE protocol for DIY hardware
Interface Enhancements
Bug fixes

IMPORTANT: Phidgets users MUST upgrade to Library 22 in order to use Roastmaster 11

Ratings and Reviews

4.8 out of 5
5 Ratings
5 Ratings
Bats & Crows ,


I fully agree that both the app and Danny are extremely helpful. It is really comprehensive in covering so many aspects of roasting coffee. But there is one feature that really brought me back after a year or so of using it, then a couple of years of not using it. It now generates, DURING A ROAST, a curve of any reading or setting that one wishes to time plot. In other words, at any desired moments, one can enter data that are read from any source, and the data will be graphed vs time. That is great for observing the progress of, for instance, beand mass temperature. (But you could also use it to generate a time plot of the outdoor temperature, if you so wished, though I haven't checked for the upper time limit on such a plot.) Some roasters spend a lot of time and money on fully automatic roaster control from their computer. This is for the simpler person like me who wishes to do things more manually, and get a nice 'feel' for things. It is also helps remind those like me who need to do certain manual things during a roast, but sometimes miss because of inattentiveness. I like it!

Neo442 ,

If you roast- you NEED this ap! UPDATE!

I wrote the first review for this app when it was released, and just did my 303rd roast with it. The features just keep getting better! Keep up the good work! Here's my initial review, for grinds and grins! ☕️
I was sitting at home this morning meditating on the full city+ Sumatra I roasted last night thinking, you know, I should make an app that let's you keep track of your roasts, so you can duplicate the art you just created the day before. I, however am not the programming type, so I figured I should see if there was "an app for that". Indeed, there is! This program is a must for any serious roaster. The UI is polished, and shinier than the finish of a French Roast out of the oven. It let's you track what kind of beans you have, how you have roasted them in the past, cupping scores, and stuff I never thought about, in a simple to use way. Now I can stop using my iPhone timer to keep track of what I consider vital information. Keep up the good work! And thanks for nit releasing a half-baked app!

XxxoSUNoxxX ,

Incredible improvement

Prior to the update over 800 roasts were logged in our cafe using this app. I was on the verge of abandoning roastmaster and had already installed both artisan and typica on an extra MacBook. The lack of a ROR curve was a primary factor. As a novice roaster I can use all of the data possible. Plotting the ROR post roast for analysis was tiresome and less helpful then a live read. This has been addressed.
Along with a whole lot more!
Expectations of the update were far exceeded. The roast analyzer is insanely rich with features that improve and enrich workflow. Building a profile pre roast is a welcome feature. I'm sure more will be discover as I continue to explore the new functions.
For now the iPad/iPhone will continue to handle the bulk of work in the cafe, handling transactions, managing inventory, playing music, running acaia coffee scales and roasting.
The one improvement could come from us, the user community. The unused forums at rainfrog could be an amazing place to share knowledge, collaborate and grow in our craft.


Rainfrog, Inc.
96.1 MB
Food & Drink
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, Korean, Simplified Chinese, Spanish
Age Rating
Rated 4+
© 2010 Rainfrog,Inc.
In-App Purchases
  1. Data Logging $14.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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