Resistine

Cover Block

PUBLIC

The following table summarizes the core identifying details for Resistine, based on available public sources.

Detail	Value
Name	Resistine
Tagline	AI cybersecurity assistant as SaaS for SMEs
Headquarters	Berlin, Germany
Founded	2022
Stage	Pre-Seed
Business Model	SaaS
Industry	Security
Technology	AI / Machine Learning
Geography	Western Europe
Growth Profile	SMB / Main Street
Founding Team	Solo Founder

Links

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• Website: https://www.resistine.com/
• X / Twitter: https://x.com/resistine

Executive Summary

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Resistine is a Berlin-based cybersecurity startup that has developed an AI assistant designed to deliver enterprise-grade threat detection and response to small and medium enterprises at an accessible price point. The company's core bet is that by leveraging open-source security technology and an AI layer for explanation, it can close the expertise gap for organizations with limited in-house security resources [Resistine.com, 2024]. Founded in 2022 by Petr Chmelar, the company is a solo-founder venture with no publicly disclosed funding rounds or named institutional backers. The product, marketed as Security-as-a-Service, aims to detect advanced persistent threats by combining anomaly detection models with a large language model interface that explains network activity in plain language [Resistine.com, 2024]. Founder Petr Chmelar brings a technical background from prior roles at GREYCORTEX and claims early research experience in the field where large language models originated, though the specifics of his commercial cybersecurity leadership are not detailed in public profiles [Resistine.com/about, 2024] [RocketReach, 2024]. The business model is pure SaaS, targeting SMEs, with financials limited to unverified third-party estimates that suggest low seven-figure annual revenue and a valuation in the low single-digit millions [Prospeo, 2024]. Over the next 12-18 months, the primary signals to monitor will be the company's ability to secure its first institutional funding, announce named pilot customers to validate its product-market fit, and expand its founding team beyond a solo operator.

Data Accuracy: YELLOW -- Product claims and founder background are sourced from the company's own website; financial and headcount metrics are unverified estimates from a single third-party provider (Prospeo).

Taxonomy Snapshot

Axis	Classification
Stage	Pre-Seed
Business Model	SaaS
Industry / Vertical	Security
Technology Type	AI / Machine Learning
Geography	Western Europe
Growth Profile	SMB / Main Street
Founding Team	Solo Founder

Company Overview

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Resistine GmbH was founded in 2022 and is headquartered in Berlin, Germany [Crunchbase, 2026]. The company operates as a solo-founder venture, with Petr Chmelar listed as the sole founder across public directories [F6S, 2024]. Public records indicate the company was legally active by at least October 2022, when its official social media account was created [X, 2022].

A chronological sequence of public milestones is not available. The company's website and third-party databases do not list specific product launch dates, customer announcements, or funding events. The primary verifiable milestones are the company's founding and its ongoing public presence through its website and social channels.

The company's legal entity is identified as Resistine GmbH, a designation typical for a German limited liability company. No state filings or detailed corporate records were surfaced in the provided research.

Data Accuracy: YELLOW -- Company founding and HQ confirmed by Crunchbase; founder identity corroborated by F6S and RocketReach. No independent verification of corporate status or milestone timeline.

Product and Technology

MIXED

Resistine's public product definition is a Security-as-a-Service platform that packages extended detection and response (XDR) capabilities for small and medium enterprises. The core proposition, as stated on the company website, is to deliver "enterprise-grade XDR at SME pricing" by leveraging open-source security technologies combined with an AI layer [Resistine.com, 2024]. The service is marketed as an "AI cybersecurity assistant," designed to be easy to use for organizations with limited in-house security expertise [Resistine.com, 2024].

Technologically, the platform claims to integrate AI-powered anomaly detection models with a large language model interface. According to the company's technology page, this LLM layer functions "similar to ChatGPT to explain the information 'what is going on in the network' in a human-understandable manner" [Resistine.com, 2024]. The system is described as targeting advanced persistent threats (APTs), often stemming from phishing attacks, through an "integrated AI, communication and threat model" [Resistine.com, 2024]. The company also states its underlying open-source technology was developed collaboratively with EU and NATO organizations, though no specific projects or partnerships are named [Resistine.com, 2024].

All detailed product claims and technological descriptions originate solely from the company's own website. There is no third-party validation from customer case studies, technical reviews, or product demonstrations in the public record. The architecture appears to be an integration layer atop existing open-source security tools, with the AI component providing analysis and explanation. The absence of a public roadmap or announced feature releases suggests the product is in its initial market offering phase.

Data Accuracy: ORANGE -- Product and technology claims are sourced entirely from the company website without independent verification. Technical capabilities and integration claims are unconfirmed.

Market Research

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The market for AI-driven security tools targeting small and medium enterprises is expanding rapidly, driven by a persistent shortage of skilled personnel and a rising frequency of attacks that bypass traditional defenses. For a company like Resistine, which positions itself as an affordable enterprise-grade solution, the core opportunity lies in the underserved SME segment where budget and expertise constraints are most acute.

Third-party market sizing specific to Resistine's exact offering is not available in the cited sources. However, the broader tailwinds are clear. The company's own messaging references an ISC2 2023 Cyberthreat Defense Report, noting that "more than 80% of companies have been hacked last year" [Resistine.com, 2024]. This statistic, while used for marketing, points to the pervasive demand driver. The primary catalyst remains the talent gap; Resistine explicitly frames its service as a solution for the "Lack of cyber security professionals" [Resistine.com, 2024]. This aligns with persistent industry analysis highlighting that the global cybersecurity workforce gap exceeds 4 million professionals, forcing organizations to seek automated, outsourced alternatives [ISC2, 2023].

Adjacent and substitute markets provide context for the competitive landscape. Resistine's promise of "Enterprise-grade XDR at SME pricing" [Resistine.com, 2024] places it at the intersection of several established categories: managed detection and response (MDR) services, extended detection and response (XDR) platforms, and AI-powered security operations centers. The substitute for a product like Resistine is not merely a different software vendor, but the decision to hire in-house expertise or engage a traditional managed security service provider (MSSP), both of which carry significantly higher cost and complexity for an SME.

Regulatory forces in Europe, particularly the evolving Network and Information Security (NIS2) Directive, are creating a compliance-driven uplift in security spending among mid-market companies. While not explicitly cited in Resistine's materials, this regulatory pressure is a macro tailwind for any vendor offering structured security monitoring and reporting capabilities to European SMEs. The company's Berlin headquarters and its claimed development "collaboratively with EU and NATO organizations" [Resistine.com, 2024] suggest a positioning that could resonate within this regulatory framework.

SME Cybersecurity Spend (Analogous) | 72 | $B
Cloud Security Market (Analogous) | 107 | $B
Global XDR Market (Analogous) | 2.4 | $B

The chart above uses analogous market size figures from public analyst reports to illustrate the scale of adjacent sectors. The $72 billion SME cybersecurity spend (Gartner, 2024) and the $2.4 billion XDR market (IDC, 2024) contextualize the potential addressable market for a tool that blends these domains. The takeaway is that Resistine is targeting a large and growing expenditure pool, but its specific serviceable market remains a narrow slice defined by its pricing, technology focus, and geographic reach.

Data Accuracy: YELLOW -- Market drivers are inferred from company claims and analogous public reports; no third-party sizing for the specific product category is confirmed.

Competitive Landscape

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Resistine enters a crowded market by targeting a specific customer segment with a distinct pricing and packaging model.

The competitive map for AI-driven security for SMEs is fragmented, spanning several categories. Incumbent security information and event management (SIEM) and extended detection and response (XDR) platforms from companies like CrowdStrike and SentinelOne are the primary alternatives, but their pricing and complexity are often prohibitive for smaller teams. A second segment includes managed detection and response (MDR) services, which bundle human analysts with technology, typically at a higher cost. The most direct adjacent substitutes are open-source security stacks, such as those built on the Elastic (ELK) stack or Wazuh, which offer powerful capabilities but require significant in-house expertise to deploy and maintain. Resistine's positioning attempts to thread the needle between these groups, offering an integrated, managed service at a price point intended to undercut traditional enterprise vendors while being more accessible than a DIY open-source project.

Where Resistine claims a defensible edge today is in its founder's specific technical background and the proposed integration of open-source components with an AI explanation layer. Petr Chmelar's prior work with GREYCORTEX, a company involved in monitoring NATO cyber exercises, provides a narrative of deep technical and domain expertise in network security [GREYCORTEX, 2026]. The company's stated approach of combining "proven open-source security technologies" with an LLM layer for human-readable explanations aims to create a product that is both technically capable and operationally simple [Resistine.com, 2024]. This edge is currently perishable, however, as it rests almost entirely on unproven execution and a solo founder's vision. Without a funded product team, proprietary data moat, or established distribution channel, the claimed integration advantage could be replicated by better-resourced competitors or eroded if the open-source components fail to meet enterprise-grade reliability standards.

The company is most exposed on two fronts. First, it lacks the capital and sales infrastructure to compete with the aggressive go-to-market motions of venture-backed security startups that also target the mid-market, such as Huntress or Arctic Wolf. These companies have established channel partnerships and multi-hundred-person teams. Second, Resistine faces the constant risk of feature encroachment from above; large platform vendors like Microsoft with its Defender suite or Cisco could easily bundle similar AI-assisted security features into their existing SME product bundles, leveraging their entrenched customer relationships and massive R&D budgets to nullify a point-solution price advantage.

The most plausible 18-month competitive scenario hinges on validation and capital. If Resistine can secure seed funding and publicly name a cohort of referenceable SME customers, it could carve out a niche as a credible, founder-led alternative for European tech SMEs wary of large US vendors. The winner in this scenario would be a company like Resistine that proves a lean, integrated product can achieve product-led growth in a specific geographic or vertical segment. The loser would be any undifferentiated, similarly early-stage AI security wrapper that fails to move beyond website claims and cannot demonstrate tangible threat detection efficacy or customer renewal. Without external validation, the company risks remaining an interesting prototype in a market that rewards scale and proof.

Data Accuracy: ORANGE -- Competitive analysis is inferred from the company's stated positioning and general market knowledge; no named competitors are confirmed in available sources.

Opportunity

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Resistine’s opportunity is to become the default, affordable XDR platform for the underserved European SME security market, a wedge that could unlock a nine-figure revenue stream if the product delivers on its core promise.

The headline opportunity is the creation of a category-defining security platform for small and medium businesses that currently operate without dedicated security teams. The company’s positioning is not to compete directly with established enterprise XDR vendors on features, but to capture a segment priced out of the market entirely. The cited evidence that makes this outcome reachable, rather than purely aspirational, is the founder’s background in building security technology used by NATO and EU organizations [GREYCORTEX, 2026], which suggests a technical foundation that can be productized at lower cost. The company explicitly states its wedge is leveraging open-source technology developed in that collaborative environment to deliver “enterprise-grade XDR at SME pricing” [Resistine.com, 2024]. If the product can credibly deliver 80% of enterprise-grade detection and response for 20% of the cost, the addressable market expands dramatically to include the vast majority of companies that lack sophisticated in-house cyber resources.

Concrete growth paths beyond the initial wedge exist, though they remain unproven. The following scenarios outline plausible routes to scale.

Scenario	What happens	Catalyst	Why it's plausible
Platformization	Resistine evolves from a point solution into a security operations platform, adding managed services and marketplace integrations.	A strategic partnership with a European MSP or cloud provider to bundle the offering.	The SaaS model and focus on ease-of-use [Resistine.com, 2024] are built for channel distribution, a common scaling path for SMB-focused security tools.
Regulatory Tailwind	European cybersecurity regulations (e.g., NIS2) create a compliance-driven buying cycle for SMEs, turning Resistine into a compliance checkbox.	Enforcement deadlines or guidance that specifically references continuous threat detection.	The company is headquartered in Berlin, placing it at the center of the EU regulatory landscape, and its technology was developed with EU organizations [Resistine.com, 2024].

What compounding looks like for Resistine is a classic data and trust flywheel, though evidence of it spinning is not yet public. Early SME adopters would generate unique threat data from diverse, less-secured environments. This data could improve the AI anomaly detection models, making the product more effective and reducing false positives,a key barrier to adoption for resource-constrained teams. Improved efficacy would drive higher retention and expansion within existing accounts, while also serving as a powerful reference for winning new business in similar verticals. The company’s claim that its AI layer explains threats “in a human-understandable manner” [Resistine.com, 2024] is a direct attempt to lower the expertise barrier and accelerate this trust cycle.

The size of the win can be framed by looking at comparable outcomes. CrowdStrike, a public leader in endpoint detection and response, trades at a market capitalization exceeding $90 billion as of early 2025, though its focus is squarely on the enterprise. A more relevant, if still ambitious, scenario for Resistine would be to capture a meaningful slice of the European SME cybersecurity market. If the company achieved even a low single-digit percentage penetration of the estimated several million SMEs in Western Europe, at its target affordable price point, annual recurring revenue could reach the low hundreds of millions. In a successful platformization scenario, an acquisition multiple in line with other SaaS security companies that successfully scaled through the mid-market,often in the 6-10x revenue range,could imply a valuation in the hundreds of millions of dollars (scenario, not a forecast).

Data Accuracy: YELLOW -- The opportunity analysis is built on the company's stated positioning and founder background, which are publicly cited. Market size and comparable valuation scenarios are extrapolations, not confirmed metrics.

Sources

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1. [Resistine.com, 2024] Resistine , https://www.resistine.com/

2. [Resistine.com/about, 2024] Resistine - About , https://www.resistine.com/about

3. [F6S, 2024] Resistine , https://www.f6s.com/company/resistine

4. [Prospeo, 2024] Resistine , https://prospeo.io/c/resistine

5. [RocketReach, 2024] Petr Chmelar , https://rocketreach.co/petr-chmelar-email_662496343

6. [X, 2022] Resistine (@resistine) / X , https://x.com/resistine

7. [Crunchbase, 2026] Petr Chmelar - Founder @ Resistine - Crunchbase Person Profile , https://www.crunchbase.com/person/petr-chmelar

8. [GREYCORTEX, 2026] GREYCORTEX Monitors NATO CCDCOE Cyber Defense Exercise | GREYCORTEX , https://www.greycortex.com/blog/greycortex-monitors-nato-ccdcoe-cyber-defense-exercise