Overstimulated? Two taps.
Sia is for the moments when everything is too much. Open it, say how much room you have, and it gets quieter — fast. Made for highly sensitive people.
Free to start • No account required • Works offline
Why 15-20% of people need Sia
High sensitivity is a scientifically recognized trait. If you process emotions deeply, feel overwhelmed in busy environments, or need more time to decompress - Sia was made for you.
Understand Yourself
Take the sensitivity quiz and let Sia read the home around your profile
Name a next time
After a moment that helped, name the next one — and the sun holds it until then
Find Immediate Relief
The breath and every acute situation are on the phone — even offline
Designed for highly sensitive nervous systems
Every detail crafted to feel calm, never overwhelming
Calming Techniques
Evidence-based exercises for moments of overwhelm
36 situations
Written in English and German, with the steps and minutes shown first
HSP Profile Quiz
A short quiz to begin, a fuller one when you want it
My life
Six areas that light up where you have been
Everything you need, nothing you don't
Now, and the before and after
Every situation has its acute flow — free, forever. Preparing for the next time and looking back once it's over is Sia Plus.
Dark Mode & Accessibility
Gentle on sensitive eyes with full dark mode support, larger text options, and a calm color palette throughout.
Works Everywhere
iPhone, iPad and Android. What you saved stays on the phone in your hand.
Instant Access
No sign-up required. Download and start using immediately. Everything works offline too.
Private by Design
Your personal data stays on device
- ✓ Journal entries
- ✓ Mood tracking
- ✓ HSP assessment results
- ✓ Technique ratings
Encrypted with AES-256
What we collect for app functionality
- • Anonymous usage analytics
- • Purchase receipts (if you buy)
- • Account info (only if you sign in)
No account required to use Sia
Your most sensitive data never leaves your device. We can't see your journals, mood entries, or assessment results - and we never will.
Ready to feel understood?
Start your journey to understanding your sensitivity
The acute part of Sia is free. Forever. Sia Plus is €6.99 a month or €39.99 a year with 7 days free, or €94.99 once.
Common questions
Is Sia free?
The acute part is free, forever — the breath and all 36 situations, no account, no time limit. Sia Plus is the before and the after: preparing, looking back, what your weeks show, and the courses. €6.99 a month or €39.99 a year, both with 7 days free, or €94.99 once.
Do I need to create an account?
No account needed. Download and start using Sia immediately. Your data stays on your device, encrypted and private.
What is a highly sensitive person (HSP)?
HSP is a scientifically recognized trait affecting 15-20% of people. HSPs process emotions more deeply and are more sensitive to stimuli. Sia helps you understand and work with this trait.