# Tolmo vs ysoserial.net: side-by-side comparison (2026)

[Tolmo](https://cybersectools.com/tools/tolmo) is a commercial [penetration testing](https://cybersectools.com/categories/pentesting-tools) solution by [Tolmo](https://cybersectools.com/companies/tolmo). [ysoserial.net](https://cybersectools.com/tools/ysoserialnet) is a free [penetration testing](https://cybersectools.com/categories/pentesting-tools) solution. Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Tolmo | ysoserial.net |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | Penetration Testing | Penetration Testing |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Mid-Market, SMB | Mid-Market, Enterprise |
| GitHub stars | – | 3,544 |
| Last commit | – | Dec 2024 |
| Company | Tolmo | – |
| Headquarters | – | – |

### Use cases and capabilities

| | Tolmo | ysoserial.net |
|---|---|---|
| AI Pentesting | Yes | – |
| Agentic AI Security | Yes | – |
| Graph | Yes | – |
| Attack Paths | Yes | – |
| Vulnerability | Yes | – |
| CI/CD | Yes | – |
| Cloud Native | Yes | – |
| Reconnaissance | Yes | – |
| .NET | – | Yes |
| Payload Generation | – | Yes |

### Core features

**Tolmo**

5 features listed. Sign in on the page to see them.

**ysoserial.net**

No features listed.

### Integrations

**Tolmo**

49 integrations listed. Sign in on the page to see them.

**ysoserial.net**

No integrations listed.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Tolmo](https://cybersectools.com/tools/tolmo) fits if you want a cloud product and you are a small business.
- [ysoserial.net](https://cybersectools.com/tools/ysoserialnet) fits if you need to run it on your own servers, you are an enterprise, you need a free product and you want an open-source product.

## Tolmo vs ysoserial.net FAQ

Common questions when comparing Tolmo vs ysoserial.net for penetration testing.

### What is the difference between Tolmo and ysoserial.net?

**Tolmo**: Autonomous AI agent platform for pentesting, discovery, and remediation. Built by Tolmo.

**ysoserial.net**: A payload generator that creates malicious deserialization payloads for testing .NET applications against insecure deserialization vulnerabilities.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes Tolmo and ysoserial.net?

**Tolmo** is made by Tolmo founded in 2026-01-01T00:00:00.000Z. **ysoserial.net** is open-source with 3,544 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Tolmo a good alternative to ysoserial.net?

Often, yes. Tolmo and ysoserial.net are both Penetration Testing products. Key differences: Tolmo is Commercial while ysoserial.net is Free, ysoserial.net is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Tolmo vs RunSybil](https://cybersectools.com/compare/runsybil-vs-tolmo)
- [Tolmo vs NetSPI Platform](https://cybersectools.com/compare/netspi-platform-vs-tolmo)
- [Tolmo vs Alt Security Autonomous Pentesting Platform](https://cybersectools.com/compare/alt-security-autonomous-pentesting-platform-vs-tolmo)
- [ysoserial.net vs RunSybil](https://cybersectools.com/compare/runsybil-vs-ysoserialnet)
- [ysoserial.net vs NetSPI Platform](https://cybersectools.com/compare/netspi-platform-vs-ysoserialnet)
- [ysoserial.net vs Alt Security Autonomous Pentesting Platform](https://cybersectools.com/compare/alt-security-autonomous-pentesting-platform-vs-ysoserialnet)

## Alternatives to each

- [See all Tolmo alternatives](https://cybersectools.com/alternatives/tolmo)
- [See all ysoserial.net alternatives](https://cybersectools.com/alternatives/ysoserialnet)

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Source: https://cybersectools.com/compare/tolmo-vs-ysoserialnet

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/tolmo.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Tolmo and ysoserial.net: 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=compare-md