Journal/Choosing an app
Someone sent you a sona.cards link. What is it?
A sona.cards link is a compatibility reading someone made for you. What it asks, what they see, what it does not collect, and whether it is safe to open.
You got a link. It probably came from an Instagram story, it probably said something about compatibility, and you are probably reading this because you wanted to know what it was before typing your birthday into it.
Reasonable instinct. Here is the whole thing.
What it is
sona.cards is the website for Sona, an iPhone astrology app published by Rogue Labs LLC. Someone with the app generated a compatibility link and shared it. When you open it, you answer a few questions about yourself, and both of you get a reading built from your two birth charts rather than your two sun signs.
That is the entire mechanic. There is no account, no download requirement, and no catch that reveals itself on step four.
What it asks you
Four screens, and two of them are skippable.
- Your birth date. Month, day, year. This is the only required field of the four, because without it there is no chart to read.
- Where you were born. City and country. Optional, and the form says so. It sharpens the reading, and skipping it does not block you.
- How you know each other. Crush, partner, friend, ex, family, coworker, or it's complicated. The reading changes based on which you pick, because the same Venus contact means something different between coworkers than between exes.
- A name and a short note. Both optional. This is what appears on their end alongside the result.
No email. No password. No phone number. No "sign in with" anything. If you have been trained by every other link on the internet to expect a wall halfway through, this one does not have one.
What happens next
The reading takes a few seconds to generate, and the page shows a rotating chart wheel while it works. Then you get a teaser: the headline compatibility read and the specific placements driving it.
The person who sent it gets the fuller version in their app, along with your answers. If you left the name blank, they get a reading with no name attached to it, which is a genuinely common thing people do and works fine.
You can close the page and never think about it again. Nothing is waiting for you.
What it is actually calculating
The technique is synastry: two birth charts laid over each other so the angles between one person's planets and the other's can be read. It is the standard approach working astrologers use for relationships, and we wrote a full explanation of it here.
The placements doing most of the work in a short reading are Venus and Mars. Venus describes what you find appealing and how you show affection; Mars describes how you pursue things and how you fight. The long version is here, and it is more interesting than the sun sign pairing charts that dominate search results.
Because the form does not ask for a birth time, the reading works from positions that are stable across a whole day: sun, Venus, Mars, Mercury. Moon sign and anything involving houses need a time, which is why this is presented as a teaser rather than a complete report. An app that produced a confident house-based reading from a date alone would be guessing.
The reasonable privacy questions
Are you giving away something sensitive? A birth date is a real piece of personal information and worth being deliberate about. What this form does not ask for is the set of things that make a birth date dangerous: your full legal name, your email, an address, a phone number. A date and a city with no name attached is close to the floor of what a compatibility reading can run on.
Can they see anything else about you? No. They see what you typed and the reading generated from it.
Is it going to keep messaging you? There is nowhere for it to message you from. You did not give it a contact method.
Should you still be careful? Yes, generally, with any link that arrives in
a story sticker, including this one. Check that the domain actually reads
sona.cards before you type anything. That is good practice regardless of who
sent it.
Why people send these
Mostly because it is a good story sticker. It asks one question, it takes under two minutes, and the result is specific enough to screenshot. That is the whole social mechanic, and it is not more complicated than it looks.
The less obvious reason is that it works on people who do not have the app. Every other compatibility feature in this category requires both people to install something, or requires one person to type the other's birth details in from memory. A link removes both problems: the other person enters their own data, correctly, without downloading anything.
If you have ever tried to remember whether your friend was born in March or May, you understand why this matters.
How to make your own
You need the app and your own chart in it. From there the compatibility link is generated for you and can be shared anywhere a link goes: a story sticker, a message, a bio. Each response comes back attached to whatever the person chose to tell you, and you can have several open at once.
There is no cap on how many people can answer a single link, which is why these tend to circulate further than expected. Assume a story sticker will be seen by more people than you meant.
The other kind of sona.cards link
There is a second format you might have received: sona.cards/reading/
followed by a name. That one is not a form. It is someone's own natal chart
teaser, published deliberately, and you do not have to enter anything to read
it. It exists because people wanted a way to show their chart without a
screenshot.
If you have an iPhone and the app installed, that link opens the app instead and offers to add them as a connection. If you do not, it opens the web version and behaves normally.
If the page misbehaves
Almost always this is Instagram's in-app browser rather than the link. Tapping a story sticker does not open Safari; it opens a stripped-down browser inside Instagram that suspends JavaScript when you switch apps, handles storage unpredictably, and sometimes stalls a page mid-load.
The fix is the same one it always is: tap the menu in the corner and choose Open in Browser. Your answers are keyed so that reopening does not create a duplicate submission, so nothing breaks if you start over.
If the reading seems stuck on the loading screen, give it a few seconds before reloading. Generating one takes a moment, and switching away from Instagram mid-generation is what usually freezes it.
Where the app fits
Sona reads your whole birth chart and then lets you talk to it. That is the core of it: an AI companion that has your placements in hand, remembers what you told it last month, and connects the two. Around that sit daily readings shaped by current transits, three-card tarot, journal prompts that shift with what is moving, and the compatibility links that brought you here.
It is iPhone only and free to download. Using it needs a subscription, monthly or annual, and the annual plan opens with a free trial. Current pricing is on the App Store listing and shown in the app before you agree to anything. There is a fuller explainer if you want the specifics, including which of the several apps named Sona this actually is. If you are comparing options, our roundup of astrology apps for couples covers the alternatives honestly, including the ones that are better for certain things.
One thing worth saying about the result
Whatever the reading says, it is describing a shape, not delivering a verdict.
A difficult aspect between two charts is not a warning. It is a description of friction, and friction is where most of the interesting parts of a relationship happen. Plenty of long, steady, genuinely good relationships look unremarkable on paper. Plenty of catastrophic ones have gorgeous synastry.
The useful way to read one of these is as a question rather than an answer. "Your Mars sits opposite their Moon" is worth something only if it makes you think about the specific moment last week when the conversation turned. If it does, the reading did its job. If it does not, close the tab.
Either way it took ninety seconds and nobody has your email.
