✦ Western Synastry ⚡ AI-Powered 🔒 Privacy First

Where Astrology Meets Communication

The app that helps you understand everyone in your life — your boss, your partner, your family. Powered by AI and grounded in Western tropical synastry.

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Astrology that actually
helps you communicate

Not just your horoscope. Real tools for real conversations.

Understand Anyone

See people the way they want to be seen — and the way they actually are.

Predict Their Reply

Paste a real conversation. We'll tell you what they'll say next — and why. Based on how your signs actually communicate, not generic horoscopes.

Communication Guides

Save a guide for your boss, your partner, your roommate, your mom. Each one tells you exactly how to approach them, what to avoid, and why it works.

Compatibility Breakdown

Not just a number. See exactly why you click with someone — or don't. Sun, Moon, and Rising compared side by side with plain-English explanations.

Connect with People

Astrology is better when it's shared.

Companion Messages

Your companions text you. Based on their zodiac personality, they'll check in, share insights, and keep the conversation going — even when you forget to open the app.

Find Others Like You

Discover Simastry users with compatible signs. Browse privately or make yourself visible. When you find someone interesting, say hi — the conversation lands in your inbox.

Shareable Cards

Share your compatibility readings and prediction results on Instagram and TikTok. Every card is designed to make your friends download the app.

Grow Every Day

Small daily habits that compound into real understanding.

Daily Streaks

Build a habit. Open the app daily and watch your streak grow. Milestones at 7, 30, and 100 days.

Did You Know?

Learn why astrology actually works through daily bite-sized insights tied to features you're already using. No jargon, no lectures.

Personalized from Day One

After onboarding, we show you what your Sun sign says about you — in language that actually resonates. Every empty state, every notification, every tip is tailored to YOUR signs.

More than an app —
it's a community

Find people who get you. Connect on a level that goes deeper than a follow button.

Find Others Like You

Browse Simastry users with compatible signs. See who shares your communication style, your emotional wavelength, or your approach to conflict. When someone catches your eye, send a message — it lands right in their inbox.

Private Browsing

You choose who sees you. Browse the community invisibly, or make yourself visible when you're ready. No pressure, no algorithms pushing you to connect.

Privacy First

Only your display name and signs are visible. Never your email, birth details, or location. We built this for safety from day one.

Five steps to better
communication

No astrology knowledge needed. We do the heavy lifting.

1

Enter your birthday

We calculate your Sun, Moon & Rising signs. Don't know your birth time? That's fine — we'll estimate.

2

See yourself

Get a personal insight about who you are and how you communicate. This isn't a generic horoscope.

3

Add your people

Boss, partner, best friend, sister. Enter their birthday and instantly see how your signs interact.

4

Get daily guidance

Communication guides, prediction tools, and proactive messages from your companions — updated every day.

5

Share and discover

Share your readings, find compatible people, and build a streak that keeps you coming back.

Woven into your day

Simastry meets you where you already are.

Lock Screen Widget

See your daily companion score without unlocking your phone.

Siri Shortcuts

“Hey Siri, how should I talk to a Scorpio?”

Three Languages

Available in English, Spanish, and Portuguese.

Start free. Upgrade
when you're ready.

No ads. No data selling. Just astrology that works.

Free

$0

forever

  • 3 companions
  • 5 predictions per day
  • 3 saved communication guides
  • Daily streaks & insights
  • Community browsing
Get Started

Plus

$6.99

per month

  • 10 companions
  • 20 predictions per day
  • 10 saved communication guides
  • Shareable cards
  • Priority companion messages
Get Plus
Most Popular

Pro

$14.99

per month

  • Unlimited companions
  • Unlimited predictions
  • Unlimited saved guides
  • Simulate Anyone mode
  • Early access to new features
Get Pro

Powered by AI · Grounded in
Western Tropical Synastry

We take astrology seriously and your privacy even more seriously.

One tradition, done rightWe don't mix astrological traditions. We don't generate generic horoscopes. Every insight traces back to a specific relationship between your sign placements.

Your birth data is never sold or sharedNo ads. No third-party data deals. Your information stays between you and Simastry. Period.

Built for everyday people, not astrology expertsYou don't need to know your Chiron from your North Node. We translate the cosmos into plain English.

Understanding, not controllingOur guides help you empathize, not manipulate. Better communication starts with genuine understanding.

Complements professional astrologersRecommended alongside human astrologers, not as a replacement. Think of us as your daily companion between sessions.

Transparent methodologyEvery reading shows which sign placements produced it. No black boxes, no mystery scores — just clear reasoning you can verify.

★★★★★

“I finally understand why my boss never responds to long emails. Simastry told me to keep it to three bullet points. It works every time.”

Sarah M.

Marketing Manager

★★★★★

“The companion insight for my partner was scarily accurate. We've been communicating better than ever since I started using this.”

James K.

Software Engineer

★★★★★

“I use the reply predictor before every difficult conversation with my sister. It's like having a cheat code for family dynamics.”

Priya R.

Graduate Student

Ready to understand
your people?

Download Simastry and start communicating with clarity, empathy, and a little cosmic insight.

Download on the App Store