# GRASSMARLIN alternatives and competitors (2026) The closest GRASSMARLIN alternatives are [Armis Threat Detection and Analysis](https://cybersectools.com/tools/armis-threat-detection-and-analysis), [Dragos Platform Asset Visibility](https://cybersectools.com/tools/dragos-platform-asset-visibility) and [Athena Dynamics RAD](https://cybersectools.com/tools/athena-dynamics-rad). Picking a GRASSMARLIN alternative comes down to fit: OT Asset Discovery coverage, your environment, your integrations and your budget. So each option below shows what it covers, how it deploys, its pricing model and the company behind it. 10 alternatives. Closest matches: Armis Threat Detection and Analysis, Dragos Platform Asset Visibility, Athena Dynamics RAD. ## The product [GRASSMARLIN](https://cybersectools.com/tools/grassmarlin) Passively maps and visually displays ICS/SCADA network topology for network security Category: [Cyber-Physical Security](https://cybersectools.com/categories/ot-security) · Pricing model: Free ## GRASSMARLIN alternatives and competitors GRASSMARLIN is a free [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) solution. The closest matches by shared tags and NIST CSF 2.0 coverage are [Armis Threat Detection and Analysis](https://cybersectools.com/tools/armis-threat-detection-and-analysis), [Dragos Platform Asset Visibility](https://cybersectools.com/tools/dragos-platform-asset-visibility), [Athena Dynamics RAD](https://cybersectools.com/tools/athena-dynamics-rad), [Vantelis Data Acquisition Platform](https://cybersectools.com/tools/vantelis-data-acquisition-platform), and [Redinent Deep Asset Intelligence](https://cybersectools.com/tools/redinent-deep-asset-intelligence). All 10 alternatives on this page are ranked the same way. Want a free option? See [free and open source cyber-physical security solutions](https://cybersectools.com/free), plus free picks in other categories. ## The closest GRASSMARLIN alternatives These 8 solutions overlap most with GRASSMARLIN. Each one says what the product does and, when the overlap is big enough, which capabilities it shares. ### 1. [Armis Threat Detection and Analysis](https://cybersectools.com/tools/armis-threat-detection-and-analysis) OT/IoT asset discovery and threat detection platform for industrial environments [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 10 listed. See them on the [Armis Threat Detection and Analysis page](https://cybersectools.com/tools/armis-threat-detection-and-analysis#features). [Armis Threat Detection and Analysis alternatives](https://cybersectools.com/alternatives/armis-threat-detection-and-analysis) · [GRASSMARLIN vs Armis Threat Detection and Analysis](https://cybersectools.com/compare/armis-threat-detection-and-analysis-vs-grassmarlin) ### 2. [Dragos Platform Asset Visibility](https://cybersectools.com/tools/dragos-platform-asset-visibility) OT asset discovery and inventory platform for industrial environments [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 10 listed. See them on the [Dragos Platform Asset Visibility page](https://cybersectools.com/tools/dragos-platform-asset-visibility#features). [Dragos Platform Asset Visibility alternatives](https://cybersectools.com/alternatives/dragos-platform-asset-visibility) · [GRASSMARLIN vs Dragos Platform Asset Visibility](https://cybersectools.com/compare/dragos-platform-asset-visibility-vs-grassmarlin) ### 3. [Athena Dynamics RAD](https://cybersectools.com/tools/athena-dynamics-rad) Remote maritime IT/OT asset discovery & vuln assessment via software agent. [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 8 listed. See them on the [Athena Dynamics RAD page](https://cybersectools.com/tools/athena-dynamics-rad#features). [Athena Dynamics RAD alternatives](https://cybersectools.com/alternatives/athena-dynamics-rad) · [GRASSMARLIN vs Athena Dynamics RAD](https://cybersectools.com/compare/athena-dynamics-rad-vs-grassmarlin) ### 4. [Vantelis Data Acquisition Platform](https://cybersectools.com/tools/vantelis-data-acquisition-platform) Agentless OT data acquisition platform for passive asset & traffic visibility. [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 8 listed. See them on the [Vantelis Data Acquisition Platform page](https://cybersectools.com/tools/vantelis-data-acquisition-platform#features). [Vantelis Data Acquisition Platform alternatives](https://cybersectools.com/alternatives/vantelis-data-acquisition-platform) · [GRASSMARLIN vs Vantelis Data Acquisition Platform](https://cybersectools.com/compare/grassmarlin-vs-vantelis-data-acquisition-platform) ### 5. [Redinent Deep Asset Intelligence](https://cybersectools.com/tools/redinent-deep-asset-intelligence) Cloud-based IoT/OT asset intelligence engine for device profiling and OEM detection. [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 8 listed. See them on the [Redinent Deep Asset Intelligence page](https://cybersectools.com/tools/redinent-deep-asset-intelligence#features). [Redinent Deep Asset Intelligence alternatives](https://cybersectools.com/alternatives/redinent-deep-asset-intelligence) · [GRASSMARLIN vs Redinent Deep Asset Intelligence](https://cybersectools.com/compare/grassmarlin-vs-redinent-deep-asset-intelligence) ### 6. [Phosphorus xIoT Global Device Network](https://cybersectools.com/tools/phosphorus-xiot-global-device-network) Database of 1M+ xIoT/OT/IoMT device profiles for CPS asset coverage. [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 6 listed. See them on the [Phosphorus xIoT Global Device Network page](https://cybersectools.com/tools/phosphorus-xiot-global-device-network#features). [Phosphorus xIoT Global Device Network alternatives](https://cybersectools.com/alternatives/phosphorus-xiot-global-device-network) · [GRASSMARLIN vs Phosphorus xIoT Global Device Network](https://cybersectools.com/compare/grassmarlin-vs-phosphorus-xiot-global-device-network) ### 7. [Nozomi Networks Nozomi Smart Polling](https://cybersectools.com/tools/nozomi-networks-nozomi-smart-polling) Active polling add-on for OT/IoT asset discovery and configuration data [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 8 listed. See them on the [Nozomi Networks Nozomi Smart Polling page](https://cybersectools.com/tools/nozomi-networks-nozomi-smart-polling#features). [Nozomi Networks Nozomi Smart Polling alternatives](https://cybersectools.com/alternatives/nozomi-networks-nozomi-smart-polling) · [GRASSMARLIN vs Nozomi Networks Nozomi Smart Polling](https://cybersectools.com/compare/grassmarlin-vs-nozomi-networks-nozomi-smart-polling) ### 8. [SAM Intelligence](https://cybersectools.com/tools/sam-intelligence) Network device & service visibility platform for ISPs using device fingerprinting. [OT Asset Discovery](https://cybersectools.com/categories/asset-discovery) · Commercial Key features: 9 listed. See them on the [SAM Intelligence page](https://cybersectools.com/tools/sam-intelligence#features). [SAM Intelligence alternatives](https://cybersectools.com/alternatives/sam-intelligence) · [GRASSMARLIN vs SAM Intelligence](https://cybersectools.com/compare/grassmarlin-vs-sam-intelligence) ## All 10 products like GRASSMARLIN The 8 above, plus: - [Nautilus OT](https://cybersectools.com/tools/nautilus-ot) (Commercial) - [SecuriThings Essential Visibility](https://cybersectools.com/tools/securithings-essential-visibility): Physical security device visibility, inventory, and vulnerability mgmt platform. (Commercial) ## Alternatives to each of these [Armis Threat Detection and Analysis alternatives](https://cybersectools.com/alternatives/armis-threat-detection-and-analysis) · [Dragos Platform Asset Visibility alternatives](https://cybersectools.com/alternatives/dragos-platform-asset-visibility) · [Athena Dynamics RAD alternatives](https://cybersectools.com/alternatives/athena-dynamics-rad) · [Vantelis Data Acquisition Platform alternatives](https://cybersectools.com/alternatives/vantelis-data-acquisition-platform) · [Redinent Deep Asset Intelligence alternatives](https://cybersectools.com/alternatives/redinent-deep-asset-intelligence) · [Phosphorus xIoT Global Device Network alternatives](https://cybersectools.com/alternatives/phosphorus-xiot-global-device-network) · [Nozomi Networks Nozomi Smart Polling alternatives](https://cybersectools.com/alternatives/nozomi-networks-nozomi-smart-polling) · [SAM Intelligence alternatives](https://cybersectools.com/alternatives/sam-intelligence) · [Nautilus OT alternatives](https://cybersectools.com/alternatives/nautilus-ot) · [SecuriThings Essential Visibility alternatives](https://cybersectools.com/alternatives/securithings-essential-visibility) ## Compare GRASSMARLIN with - [GRASSMARLIN vs Armis Threat Detection and Analysis](https://cybersectools.com/compare/armis-threat-detection-and-analysis-vs-grassmarlin) - [GRASSMARLIN vs Dragos Platform Asset Visibility](https://cybersectools.com/compare/dragos-platform-asset-visibility-vs-grassmarlin) - [GRASSMARLIN vs Athena Dynamics RAD](https://cybersectools.com/compare/athena-dynamics-rad-vs-grassmarlin) - [GRASSMARLIN vs Vantelis Data Acquisition Platform](https://cybersectools.com/compare/grassmarlin-vs-vantelis-data-acquisition-platform) - [GRASSMARLIN vs Redinent Deep Asset Intelligence](https://cybersectools.com/compare/grassmarlin-vs-redinent-deep-asset-intelligence) - [GRASSMARLIN vs Phosphorus xIoT Global Device Network](https://cybersectools.com/compare/grassmarlin-vs-phosphorus-xiot-global-device-network) - [GRASSMARLIN vs Nozomi Networks Nozomi Smart Polling](https://cybersectools.com/compare/grassmarlin-vs-nozomi-networks-nozomi-smart-polling) - [GRASSMARLIN vs SAM Intelligence](https://cybersectools.com/compare/grassmarlin-vs-sam-intelligence) ## GRASSMARLIN Alternatives FAQ ### What are the closest alternatives to GRASSMARLIN? The closest matches to GRASSMARLIN by shared tags and NIST CSF 2.0 coverage are Armis Threat Detection and Analysis, Dragos Platform Asset Visibility, Athena Dynamics RAD, Vantelis Data Acquisition Platform, and Redinent Deep Asset Intelligence. All of them are OT Asset Discovery products. ### How many alternatives to GRASSMARLIN are available? This page shows 10 alternatives to GRASSMARLIN, all in the OT Asset Discovery category. Each one is matched on shared tags and NIST CSF 2.0 areas, and the closest matches rank first. ### Is GRASSMARLIN free or commercial? GRASSMARLIN is a free OT Asset Discovery product. You can use it at no cost. Only commercial alternatives are listed here. Free and open source products are under /free. ### What type of solution is GRASSMARLIN? GRASSMARLIN is a OT Asset Discovery product in the Cyber-Physical Security category. You can compare it with the 10 other OT Asset Discovery products on this page. --- Source: https://cybersectools.com/alternatives/grassmarlin For AI agents: every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md, and any product or compare page has a Markdown copy too (add .md to its URL). More on GRASSMARLIN and its alternatives: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=alternatives-md