heySec · security, made simple

Protection for what you rely on.

The AI your business runs on, and the home you come back to. Both kept safe with what you already have.

For business Prompt Firewall Scans and contains everything your AI reads, in the cloud or on your own premises. For your home heySec Home Turns the phones, tablets and computers you already own into a security system.

For business · Prompt Firewall

Everything your AI reads. Scanned. Contained.

Customer emails, uploaded files, web pages and tool output all reach your model with the same trust as your own instructions. Prompt Firewall reads past every disguise to catch hidden attacks, then contains the content so even new tricks stay trapped.

3–12 msScanning and containment in the same run
Hundredsof languages, each read in the original
2 layersScanning for the known, containment for the rest
A business app protected by heySec: a hidden instruction in a message is flagged and contained before it reaches the AI assistant.

Cloud API

One call in front of your model, on EU servers only. Works with any stack.

How it works

Enterprise

The same protection inside your own network, with no outside connection.

Run it on-premises

Why not use another AI to check?

Because the same trick that fools one AI will fool another

If an attacker can manipulate your AI with hidden instructions, they can manipulate a second AI the same way. Running one model in front of another just gives the attacker two targets instead of one, slower responses, and a bigger bill.

We go deeper: purpose-built scanning that can’t be talked out of doing its job, plus containment that locks content in a boundary no attack can escape.

100× faster

Checks complete in 3 to 12 ms. A second AI typically takes 500 ms or more. Your users never notice a delay.

Reliable

The same piece of content always gets the same verdict. No guesswork, no surprises, no retries needed.

Two layers

Scanning catches known attacks. Containment locks content in a boundary your AI treats as data. Together, they give you defence in depth against prompt injection.

For your home · heySec Home

Your old phone has a new job: keeping watch.

heySec Home turns the devices you already own into a security system. The tablet in the hallway, the laptop on the desk and the phone you replaced last year become cameras and sensors, and your phone becomes the control.

  • No new hardware. iPhone and iPad, Android, Mac, Windows and Linux, plus the smart-home sensors you already have.
  • Arm Home, Night or Away. The cloud keeps watch around the clock and tells you when a device goes quiet.
  • Private by design. Sound is analysed on the device. Photos are taken only while armed.
Explore heySec Home Join the waitlist
An old tablet on the hallway console at night, facing the front door.
heySec Home app: Project Alpha House is disarmed, with Arm Home, Arm Night and Arm Away buttons, no open alarms, and 2 devices online.

One standard

Two products. The same promises.

Whether heySec guards a model or a hallway, it is built the same way: private first, clear about what it saw, and made to fit what you already run.

  • Private first

    Prompt Firewall redacts personal data from its logs before storage. heySec Home analyses sound on the device and sends a recording only when it sets off an alert while armed.

  • Clear about what it saw

    Every verdict names the threat, its severity and confidence. Every alarm names the device and what it noticed.

  • Fits what you already run

    One API call in front of your model. The devices already in your drawer, and the HomeKit and Home Assistant sensors already on your walls.

  • Built in Europe

    heySec is an EU company. Prompt Firewall runs on EU servers only, and on your own premises with Enterprise.

The Spy Check app on a Mac, asking which phone you have: iPhone or Android.

Free for Mac · Spy Check

Worried about spyware? Check your phone for free.

Spy Check looks for Pegasus and other mercenary spyware, and for more than 170 stalkerware apps, on an iPhone or an Android phone. Plug the phone into your Mac and follow the steps.

  • The investigators’ toolkit, made easy. Underneath runs MVT by Amnesty International’s Security Lab.
  • Nothing leaves your Mac. The phone’s data is checked offline and deleted when the check is done.
  • One clear answer. What was found, what could not be checked, and what to do next.
Explore Spy Check

Be first in line

Both products are in private testing. Tell us which one you want and we will invite you as places open.

For my business
For my home