v1.0.0 — out now, free forever

Simple, straightforward security.
Even against the most malicious hackers.

Skypersky is open-source antivirus that does one thing well: keep your machine clean. No upsells, no subscriptions, no “premium activation key” popups at 2 AM. Just protection — toggle on, walk away.

100% free, forever Open source (MIT) No telemetry Win • macOS • Linux
Skypersky desktop app showing Protection enabled
Real-time guard active · 0 threats
Quarantined trojan.win.unsafe.exe
// What you get

Security without the theatre.

Most antivirus apps want to be your homepage, your VPN, your password manager, and your therapist. Skypersky just wants to stop the bad stuff. Here’s how.

Real-time protection, one toggle.

Flip Protection on and Skypersky watches every file that touches disk, every process that spins up, and every binary that wants to phone home. Detection uses a hybrid signature + heuristic engine that ships with weekly updates and a community-curated allowlist. Off when you want it off, on when you don’t.

Quarantine, not delete

Suspicious files land in an encrypted vault. You decide what gets purged.

Light on resources

Idle: ~40 MB RAM, <0.5% CPU. Your fans will not know it’s there.

Open source, auditable

Every line is on the public tracker. Read it, fork it, file an issue.

Silent updates

Definitions refresh in the background. Never an interruption, never a reboot prompt.

// Get it

One click. Pick your OS.

Version 1.0.0 — released for Windows, macOS, and Linux. Same engine, same UI, same price ($0).

Released 2026 · v1.0.0 · MIT License
Source repository  ·  Report a problem
// How it works

Three steps. Then you forget about it.

Download & extract

Grab the archive for your OS, extract it wherever you like, and run the binary. No installer, no bundled toolbars, no opt-out checkboxes hidden in step 4.

Flip Protection on

The whole UI is one switch. On = real-time scanning, behavioural analysis, and safe-browsing hooks. Off = nothing runs.

Get on with your day

Skypersky stays out of the way. If something looks bad, it’s quarantined silently into the encrypted vault — no popups, no carousel of upsells.

// The price

Free, in the boring way.

No trial. No “basic” tier with the good stuff missing. No 30-day timer ticking down in the system tray. Skypersky is built and maintained by independent developers because someone should make a tool like this.

// Skypersky · Full
$0 .00
USD · forever · per device
  • Real-time protection on Windows, macOS, Linux
  • Encrypted quarantine vault
  • Weekly definition updates
  • Community issue tracker support
  • Source code, all of it
  • Zero ads, zero telemetry, zero accounts
// FAQ

Reasonable questions.

Is it really free? What’s the catch?
No catch. Skypersky is MIT-licensed and developed in the open. There’s no paid tier, no “Pro” SKU, no data-broker arrangement. If you want to support the project, star the repo or send a patch.
How does it compare to the antivirus that came with my OS?
Skypersky runs alongside built-in protection on Windows and macOS without conflict — we register as a secondary scanner. On Linux it’s usually the only on-access scanner you have. Definitions update weekly from a public mirror.
Where do I report a bug or false positive?
File it on the public issue tracker: github.com/TheFlipside/skypersky/issues. Include the version, the file hash, and what you expected to happen. False-positive triage usually lands within 48 hours.
Does Skypersky collect any data?
No analytics, no crash phone-home, no “help us improve” checkbox. The only outbound traffic is the signed definitions feed, which uses HTTPS and a pinned certificate. You can audit the network calls in the source.
What about ARM / Apple Silicon / 32-bit?
The macOS build is a Universal binary (Intel + Apple Silicon). Windows and Linux ship x86_64 today; ARM Linux and Windows-on-ARM are on the roadmap — watch the releases page.
// Ready?

Protect your machine. It takes a minute.

No account. No credit card. No newsletter signup. Just a download and a toggle.