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For the Daysy project, a basal body thermometer designed to reliably determine a woman’s fertile and infertile days based on highly precise measurement of morning oral body temperature, I was immediately enthusiastic. It is not only an excellent tool for planning pregnancy, but it also works in reverse, serving as a natural form of contraception.

With regular daily use, the device gradually learns the individual cycle of the user and, through internal algorithms, evaluates not only fertile and infertile days but also the progression of each phase of the cycle, including menstruation. The connection to a mobile application allows detailed charts and additional clear insights into the processes taking place in the body.

The thermometer is a highly intimate device, the user comes into contact with it in the very first moments after waking. The design reflects this context: simple, calm, and organic. In our concepts and prototypes, we considered using medical-grade silicone to make the device flexible, pleasant to the touch, and waterproof. It is currently manufactured from high-quality, tactile plastic.

In addition to the product and graphic design, we were also involved in prototyping and, in collaboration with the Institute of Physics of the Czech Academy of Sciences, in testing the functionality and measurement accuracy.

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Realisation 2015
Web www.daysy.me

Designer Anna Marešová
Product designer Sergej Kuckir
Graphic designers Jiří Beran

Industrialization & Product Identity Milani.ch
Client
Valley Electronics AG, Switzerland

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White Daysy basal body thermometer with water droplets and a glowing blue indicator light, designed by Anna Marešová.
Close-up product shot of a white Daysy basal body thermometer with a glowing pink indicator light.

Woman demonstrating the use of the white Daysy basal body thermometer for morning oral measurement, designed by Anna Marešová.

Studio product shot of a white Daysy basal body thermometer in custom packaging, designed by Czech product designer Anna Marešová.

Close-up of the Daysy basal body thermometer held in a hand, featuring a glowing indicator and water droplets.

Studio product shot of three white Daysy basal body thermometers with different colored indicator lights, designed by Anna Marešová.

Studio flat-lay product shot of white Daysy basal body thermometers.

Close-up hand-held product view of a white Daysy basal body thermometer, designed by Czech product designer Anna Marešová.

Composite grid of prototyping stages, molds, electronic components, and color variants for the Daysy basal thermometer project by Anna Marešová Designers.

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