# ImmuniWeb® On-Demand vs RsaCtfTool: 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). [RsaCtfTool](https://cybersectools.com/tools/rsactftool) 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 | RsaCtfTool |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | Penetration Testing | Penetration Testing |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB |
| GitHub stars | – | 6,830 |
| Last commit | – | Mar 2026 |
| Company | ImmuniWeb | – |
| Headquarters | – | – |

### Use cases and capabilities

| | ImmuniWeb® On-Demand | RsaCtfTool |
|---|---|---|
| DevSecOps | Yes | – |
| OWASP | Yes | – |
| CTF | – | Yes |
| Education | – | Yes |

### Core features

**ImmuniWeb® On-Demand**

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

**RsaCtfTool**

No features listed.

### Integrations

**ImmuniWeb® On-Demand**

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

**RsaCtfTool**

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 mid-market company or an enterprise.
- [RsaCtfTool](https://cybersectools.com/tools/rsactftool) fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product.

## ImmuniWeb® On-Demand vs RsaCtfTool FAQ

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

### What is the difference between ImmuniWeb® On-Demand and RsaCtfTool?

**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.

**RsaCtfTool**: A utility that attempts to decrypt data from weak RSA public keys and recover private keys using multiple integer factorization algorithms.

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

### Who makes ImmuniWeb® On-Demand and RsaCtfTool?

**ImmuniWeb® On-Demand** is made by ImmuniWeb. **RsaCtfTool** is open-source with 6,830 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 RsaCtfTool?

Often, yes. ImmuniWeb® On-Demand and RsaCtfTool are both Penetration Testing products. Key differences: ImmuniWeb® On-Demand is Commercial while RsaCtfTool is Free, RsaCtfTool 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)
- [RsaCtfTool vs ZeroThreat.ai](https://cybersectools.com/compare/rsactftool-vs-zerothreatai)
- [RsaCtfTool vs Aikido Attack](https://cybersectools.com/compare/aikido-attack-vs-rsactftool)
- [RsaCtfTool vs Vulneri Pentest](https://cybersectools.com/compare/rsactftool-vs-vulneri-pentest)

## Alternatives to each

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

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

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 RsaCtfTool: 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