The defensive half of the loop
Attack-Proven
Defence.
Keelr attacks, Panthero defends, the loop never stops. Continuous adversarial validation, EU-sovereign by design - because defence that has never been attacked has never been proven.
The Loop
Two sibling platforms, one closed loop.
Keelr runs continuous authorised adversarial simulation against your scope. Panthero generates and stages the remediation. Keelr re-attacks to prove the fix holds. A human approves the push to production. The whole cycle runs autonomously - discovery, validation, and proposed remediation without human intervention. Only the final step into production stays human-controlled.
Keelr attacks
Continuous adversarial simulation against authorised scope. Discovery, exploitation proofs, re-attack verdicts. The offensive half of the loop.
Visit keelr.coPanthero defends
Defensive intelligence, active enforcement, behavioural scoring, and remediation that closes the loop. Real capabilities running on real infrastructure today.
See the pillarsThe loop never stops
Every fix Panthero deploys gets re-attacked by Keelr. If the exploit path is closed, the fix is confirmed. If not, the loop iterates. Autonomous to staging, human-approved for production.
Read the full storyThe defensive platform
Four pillars, real today.
Panthero's defensive substrate is built on four pillars. The first three are available to every customer, including Free. The fourth - Validated by Keelr - activates when you run Panthero as part of The Loop.
1. Defensive intelligence
224M+ threat records enriched with geolocation across 230+ countries, ISP and ASN attribution, and behavioural fingerprints. Continuously ingested from 70+ public feeds and our own sensor network deployed on real infrastructure. Know who is knocking before you open the door.
2. Active defence
Drop-in middleware for Django, a Debian agent for any Linux server, and modules for nginx and Apache. Real-time enforcement at the edge, granular allowlists, traffic logging, and volumetric + application-layer attack mitigation. The modern descendant of decades of battle-tested firewall scripts.
3. Behavioural scoring
A production machine-learning model scores every source by what it is trying to do - not just where it comes from. Brute-forcer, scanner, spammer, scraper, credential stuffer, exploit attempt. Intent-driven decisions get sharper with every observation. Included on every plan.
4. Validated by Keelr The Loop
The Defensive Agent ingests Keelr findings, generates and stages remediations, deploys compensating controls at the edge while the fix is in flight, and promotes to production only after Keelr re-attacks and confirms the exploit path is closed. Active when you run The Loop.
Why Panthero
Defence you can verify.
Refresh as fast as the threat moves
Stale blocklists are worse than no blocklists. Panthero refreshes every record at the cadence its threat category deserves - from real-time profiling of brand-new attackers to revalidation of long-lived malicious networks. No flat schedules. No blanket TTLs.
EU-sovereign by design
Infrastructure operated across multiple regions in Europe. Data residency, privacy, and compliance that NIS2 and DORA customers can defend to their auditors - and that everyone else can rely on.
Verify everything. Trust nothing.
Every request is cryptographically authenticated. Every source is scored before it touches your application. No implicit trust, no exceptions - your infrastructure stays protected even when the perimeter fails.
Ready to prove your defence?
Start defending today
Set up in minutes. Start with Pay-as-you-go, move to The Loop when you want your defence attack-proven. Founding-customer pricing through 14 July 2026 - 25% off annual, 15% off monthly.