# ImmuniWeb® On-Demand vs ysoserial.net: side-by-side comparison (2026)

[ImmuniWeb® On-Demand](https://cybersectools.com/tools/immuniwebr-on-demand) is a commercial [penetration testing](https://cybersectools.com/categories/pentesting-tools) solution by [ImmuniWeb](https://cybersectools.com/companies/immuniweb). [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

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

### Use cases and capabilities

| | ImmuniWeb® On-Demand | ysoserial.net |
|---|---|---|
| DevSecOps | Yes | – |
| OWASP | Yes | – |
| .NET | – | Yes |
| Payload Generation | – | Yes |

### Core features

**ImmuniWeb® On-Demand**

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

**ysoserial.net**

No features listed.

### Integrations

**ImmuniWeb® On-Demand**

17 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.

- [ImmuniWeb® On-Demand](https://cybersectools.com/tools/immuniwebr-on-demand) 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 need a free product and you want an open-source product.

## ImmuniWeb® On-Demand vs ysoserial.net FAQ

Common questions when comparing ImmuniWeb® On-Demand vs ysoserial.net for penetration testing.

### What is the difference between ImmuniWeb® On-Demand and ysoserial.net?

**ImmuniWeb® On-Demand**: ImmuniWeb® On-Demand is a web application penetration testing platform that combines AI-powered automation with manual security testing to provide comprehensive vulnerability assessments and compliance reporting. Built by ImmuniWeb.

**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 ImmuniWeb® On-Demand and ysoserial.net?

**ImmuniWeb® On-Demand** is made by ImmuniWeb. **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 ImmuniWeb® On-Demand a good alternative to ysoserial.net?

Often, yes. ImmuniWeb® On-Demand and ysoserial.net are both Penetration Testing products. Key differences: ImmuniWeb® On-Demand 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

- [ImmuniWeb® On-Demand vs ZeroThreat.ai](https://cybersectools.com/compare/immuniwebr-on-demand-vs-zerothreatai)
- [ImmuniWeb® On-Demand vs Aikido Attack](https://cybersectools.com/compare/aikido-attack-vs-immuniwebr-on-demand)
- [ImmuniWeb® On-Demand vs Vulneri Pentest](https://cybersectools.com/compare/immuniwebr-on-demand-vs-vulneri-pentest)
- [ysoserial.net vs ZeroThreat.ai](https://cybersectools.com/compare/ysoserialnet-vs-zerothreatai)
- [ysoserial.net vs Aikido Attack](https://cybersectools.com/compare/aikido-attack-vs-ysoserialnet)
- [ysoserial.net vs Vulneri Pentest](https://cybersectools.com/compare/vulneri-pentest-vs-ysoserialnet)

## Alternatives to each

- [See all ImmuniWeb® On-Demand alternatives](https://cybersectools.com/alternatives/immuniwebr-on-demand)
- [See all ysoserial.net alternatives](https://cybersectools.com/alternatives/ysoserialnet)

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Source: https://cybersectools.com/compare/immuniwebr-on-demand-vs-ysoserialnet

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

More on ImmuniWeb® On-Demand 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