Thessa is a beautiful and incredibly easy to use widget that allows you to control your Nest Learning Thermostat™, right from Notification Center in Mac OS X Yosemite. Simply click or drag the slider to change the temperature. That's all there is to it!

Additionally, Thessa can receive messages from your Nest Protect™, so you will instantly know when smoke or carbon monoxide has been detected.

Control the temperature in your vicinity right from your iMac or even on the go from your MacBook.

- Set the target temperature for your thermostat.
- See the current temperature and humidity as measured by the thermostat.
- Set states like Home, Away, Heat and Cool.
- Receive notifications from your smoke and carbon monoxide alarm.
- Supports both Celsius and Fahrenheit.
- Supports multiple Learning Thermostats and Protects.

Use of the Thessa Widget requires at least one Nest Learning Thermostat.

Got an iPhone, iPad, or Apple Watch? Don't forget to check out Thessa for iOS in the App Store!

What’s New

Version 1.4

We've taken care of some reliability issues.

Ratings and Reviews

2.1 out of 5
28 Ratings

28 Ratings

63strat ,

Can’t end Away setting

When the Nest goes into AWAY, the controls on Thessa to end Away don’t work. I have to use another app, Climate, to end Away. Please fix!

LexisLuther ,

Just installed… but so far it works great

Was concerned at first after reading comments on version 1.0… but I took a chance and it works well. It now supports multiple thermostats. Easy to switch between them in the widget. Super easy to setup. Will check back later after I hook up my Nest Protect to comment on its functionality with Thessa.

Tiger Richards ,

Not usable in MacOS Sierra

Not recommended. The application advertises itself for Yosemite. It does not appear to have been updated for El Capitan or Sierra. While the application launch, and clicking various buttons will change the settings on your NEST thermostat, such actions are blind, as Thessa no longer displays any values (i.e., the actual temperture selected). Needs an update, or needs to be removed from the store.


2.9 MB

OS X 10.10 or later, 64-bit processor



Age Rating


  • Family Sharing

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

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