Sophos Alternatives 2026: 5 Free Options
Sophos alternatives: Microsoft Defender Antivirus, Microsoft Defender for Business, ClamAV, Wazuh and 2 more. Prices and licenses checked October 22, 2026.
•3 min read•Security Software & Testing
Verdict:Sophos sells two quite different things, endpoint protection and firewalls, so the alternative depends on which you are leaving. The endpoint page publishes no prices, only a 30-day trial, which makes budgeting awkward for small teams. For Windows machines, the first thing to try is what you already have: Microsoft Defender Antivirus is built into Windows, and for a managed fleet, Defender for Business adds a console and detection at $3 per user a month billed yearly. The compromise is that it works best in a Microsoft environment and gives you less support for mixed fleets. ClamAV fits servers that scan files and mail but is not an endpoint suite. Wazuh adds monitoring and compliance checks across Windows, Linux and macOS at no licence cost, though it needs an engineer to run it and is not a blocking product on its own. If your Sophos is a firewall, OPNsense and pfSense Community Edition both run on hardware you choose and cost nothing in licences; OPNsense has the more modern interface and pfSense the longer track record. Both mean you lose the tight link between Sophos firewall and endpoint agents. Whatever you pick, export your firewall rules and exclusions first and test on one site or department before committing.
Quick comparison
| Tool | Price | Platforms | Best for | Tested |
|---|---|---|---|---|
| Microsoft Defender Antivirus | Free (built into Windows) | Windows | Windows machines with basic protection | Docs only |
| Microsoft Defender for Business | Paid from $3 per user/month, billed yearly | Windows, macOS, iOS, Android, Linux | Small businesses wanting a console | Docs only |
| ClamAV | Free | Linux, Windows, macOS | Scanning mail and file servers | Docs only |
| Wazuh | Free (free, no license cost; paid support and cloud not priced on the page) | Windows, Linux, macOS, Self-hosted | Detection and compliance on a budget | Docs only |
| OPNsense | Free | Self-hosted firewall (FreeBSD-based) | Replacing a Sophos firewall | Docs only |
| pfSense Community Edition | Free | Self-hosted firewall | Firewall replacement with community support | Docs only |
| CrowdStrike Falcon | Paid from $59.99 per device/year, billed annually (Falcon Go, up to 100 devices) | Windows, macOS, Linux | Endpoint security | Docs only |
| SentinelOne | Paid from $179.99 per endpoint/year (Singularity Complete, 5-100 workstations) | Windows, macOS, Linux | Endpoint security | Docs only |
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Good fit if
- You run Windows PCs and want to avoid extra licences (Microsoft Defender Antivirus is the pick)
- You want a console and EDR on a small business budget (Microsoft Defender for Business is the pick)
- You are replacing a Sophos firewall with a modern UI (OPNsense is the pick)
- You need monitoring across mixed operating systems (Wazuh is the pick)
- You scan files and mail on Linux servers (ClamAV is the pick)
Not ideal if
- You rely on Sophos features or integrations that these tools do not replicate
Sophos today: See pricing page (Sophos pricing, checked 2026-10-22).
Why people look for Sophos alternatives
Sophos lists no prices on its endpoint security page. You start a free trial or follow a How to buy route, including AWS Marketplace. The product is layered: EDR adds threat hunting and response to the base endpoint product, XDR extends EDR, and MDR is a separate optional service for 24/7 expert oversight, so each added capability is another item to price with a partner or the vendor.
Microsoft Defender Antivirus
Compared with Sophos: Built into Windows at no extra licence cost, so many small offices need nothing more. You lose Sophos's central console and firewall integration, and it covers Windows only.
Price: Free (built into Windows) (Microsoft Defender Antivirus pricing, checked 2026-10-22).
Platforms and license: Windows. Proprietary.
Best for: Windows machines with basic protection.
Worth knowing: Windows only; central management needs a paid Microsoft product.
Microsoft Defender for Business
Compared with Sophos: Adds a management console and EDR for $3 per user a month billed yearly, with a 30-day trial. Sophos publishes no prices on its endpoint page, so the cost is easier to plan, but it fits Microsoft shops best.
Price: Paid from $3 per user/month, billed yearly (Microsoft Defender for Business pricing, checked 2026-10-22).
Platforms and license: Windows, macOS, iOS, Android, Linux. Proprietary.
Best for: Small businesses wanting a console.
Worth knowing: 30-day free trial; the platform list is Microsoft's published coverage and was not re-read here.
ClamAV
Compared with Sophos: Free GPL-2.0 scanning engine with signature updates. Useful for mail and file servers, but it has no central console, behavioural detection or ransomware rollback like Sophos's endpoint product.
Price: Free (ClamAV pricing, checked 2026-10-22).
Platforms and license: Linux, Windows, macOS. GPL-2.0 (open source).
Project activity: 7.5k GitHub stars · latest release clamav-1.5.4 (Aug 7, 2026) · last commit Oct 22, 2026
Best for: Scanning mail and file servers.
Worth knowing: Scanner and signature updates only; no central console or behavioural EDR.
Wazuh
Compared with Sophos: Free open-source agents for Windows, Linux and macOS that watch for intrusions, file changes and compliance gaps. Not a prevention product like Sophos Endpoint, and it needs someone to run and tune it.
Price: Free (free, no license cost; paid support and cloud not priced on the page) (Wazuh pricing, checked 2026-10-22).
Platforms and license: Windows, Linux, macOS, Self-hosted. GPL-2.0 (most code); AGPL-3.0 (engine) (open source).
Project activity: 17.5k GitHub stars · latest release v4.14.9 (Oct 15, 2026) · last commit Oct 27, 2026
Best for: Detection and compliance on a budget.
Worth knowing: XDR/SIEM with host agents; free cloud trial.
OPNsense
Compared with Sophos: BSD-2-Clause firewall that replaces Sophos Firewall appliances, with no licence fee. You choose your own hardware and lose Sophos's integrated endpoint link, but gain open source and a plugin ecosystem.
Price: Free (OPNsense pricing, checked 2026-10-22).
Platforms and license: Self-hosted firewall (FreeBSD-based). BSD-2-Clause (open source).
Project activity: 4.8k GitHub stars · last commit Oct 27, 2026
Best for: Replacing a Sophos firewall.
Worth knowing: Replaces a firewall appliance, not endpoint protection.
pfSense Community Edition
Compared with Sophos: Apache-2.0 firewall software for your own hardware, free as Community Edition. A common Sophos Firewall replacement; commercial support is sold separately without published prices, and the interface is older than OPNsense's.
Price: Free (pfSense Community Edition pricing, checked 2026-10-22).
Platforms and license: Self-hosted firewall. Apache-2.0 (open source).
Project activity: 5.8k GitHub stars · last commit Mar 31, 2026
Best for: Firewall replacement with community support.
Worth knowing: Download goes through Netgate's store; commercial support is sold separately without published prices.
Other popular options (paid)
CrowdStrike Falcon
Compared with Sophos: Falcon Go lists $59.99 per device per year for up to 100 devices, with Pro at $99.99 and Enterprise at $184.99. Sophos publishes no prices, so these are visible up front. 15-day free trial.
Price: Paid from $59.99 per device/year, billed annually (Falcon Go, up to 100 devices) (CrowdStrike Falcon pricing, checked 2026-10-22).
SentinelOne
Compared with Sophos: Singularity Complete is listed at $179.99 per endpoint per year for 5 to 100 workstations. Sold through partners, so the partner price controls; Sophos shows no price at all.
Price: Paid from $179.99 per endpoint/year (Singularity Complete, 5-100 workstations) (SentinelOne pricing, checked 2026-10-22).
Which one to pick
- You run Windows PCs and want to avoid extra licences: Microsoft Defender Antivirus
- You want a console and EDR on a small business budget: Microsoft Defender for Business
- You are replacing a Sophos firewall with a modern UI: OPNsense
- You need monitoring across mixed operating systems: Wazuh
- You scan files and mail on Linux servers: ClamAV
Limits of this review
Docs-only for Microsoft Defender Antivirus, Microsoft Defender for Business, ClamAV, Wazuh, OPNsense, pfSense Community Edition: we did not install or run them, so feature claims come from vendor pages and we did not test import from Sophos. Vendor prices and free limits change; confirm on the linked pricing page before you buy or migrate.
More in Security Software & Testing
All Security Software & Testing alternatives →Sources
- Sophos pricing
- Microsoft Defender Antivirus pricing
- Microsoft Defender for Business pricing
- ClamAV pricing
- ClamAV license
- ClamAV GitHub repository
- Wazuh pricing
- Wazuh license
- Wazuh GitHub repository
- OPNsense pricing
- OPNsense license
- OPNsense GitHub repository
- pfSense Community Edition pricing
- pfSense Community Edition license
- CrowdStrike Falcon pricing
- SentinelOne pricing
Kevin Fan
Kevin Fan is a SaaS founder. He runs Free Instead Of, which tracks free and open-source alternatives to paid software and checks each price and free-plan limit against the vendor's own pages.
Methodology
Based on official pricing and product pages checked 2026-10-22: Sophos, Microsoft Defender Antivirus, Microsoft Defender for Business, ClamAV, Wazuh, OPNsense, pfSense Community Edition, CrowdStrike Falcon, SentinelOne. Prices, free limits and licenses are the figures shown on those pages on those dates. No tool on this page was installed or run. No accounts were created.