# MoreSec STAC vs SeaSponge: side-by-side comparison (2026)

[MoreSec STAC](https://cybersectools.com/tools/moresec-stac) is a commercial [threat modeling](https://cybersectools.com/categories/threat-modeling) solution by [默安科技 (MoreSec)](https://cybersectools.com/companies/moresec). [SeaSponge](https://cybersectools.com/tools/seasponge) is a free [threat modeling](https://cybersectools.com/categories/threat-modeling) solution. Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | MoreSec STAC | SeaSponge |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | Threat Modeling | Threat Modeling |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market |
| GitHub stars | – | 281 |
| Last commit | – | Apr 2018 |
| Company | 默安科技 (MoreSec) | – |
| Headquarters | – | – |

### Use cases and capabilities

| | MoreSec STAC | SeaSponge |
|---|---|---|
| Threat Modeling | Yes | Yes |
| DevSecOps | Yes | – |
| RAG | Yes | – |
| Generative AI | Yes | – |
| Secure Development | Yes | – |
| Security Architecture | Yes | – |
| Vulnerability | Yes | – |
| Documentation | Yes | – |
| Workflow | Yes | – |
| Security Compliance Training | Yes | – |
| Security Reporting | – | Yes |

### Core features

**MoreSec STAC**

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

**SeaSponge**

No features listed.

### Integrations

**MoreSec STAC**

1 integration listed. Sign in on the page to see them.

**SeaSponge**

No integrations listed.

## Which one fits you

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

- [MoreSec STAC](https://cybersectools.com/tools/moresec-stac) fits if you are an enterprise.
- [SeaSponge](https://cybersectools.com/tools/seasponge) fits if you are a startup, you need a free product and you want an open-source product.

## MoreSec STAC vs SeaSponge FAQ

Common questions when comparing MoreSec STAC vs SeaSponge for threat modeling.

### What is the difference between MoreSec STAC and SeaSponge?

**MoreSec STAC**: AI/RAG-based threat modeling tool for requirements and design stages of SDL. Built by 默安科技 (MoreSec).

**SeaSponge**: SeaSponge is an accessible web-based threat modeling tool with a focus on accessibility, aesthetics, and intuitive user experience.

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

### Who makes MoreSec STAC and SeaSponge?

**MoreSec STAC** is made by 默安科技 (MoreSec). **SeaSponge** is open-source with 281 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is MoreSec STAC a good alternative to SeaSponge?

Often, yes. MoreSec STAC and SeaSponge are both Threat Modeling products, and both cover Threat Modeling. Key differences: MoreSec STAC is Commercial while SeaSponge is Free, SeaSponge is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [MoreSec STAC vs DevArmor Continuous Threat Modeling](https://cybersectools.com/compare/devarmor-continuous-threat-modeling-vs-moresec-stac)
- [MoreSec STAC vs Atsign AI Architect](https://cybersectools.com/compare/atsign-ai-architect-vs-moresec-stac)
- [MoreSec STAC vs ArgusEye](https://cybersectools.com/compare/arguseye-vs-moresec-stac)
- [SeaSponge vs DevArmor Continuous Threat Modeling](https://cybersectools.com/compare/devarmor-continuous-threat-modeling-vs-seasponge)
- [SeaSponge vs Atsign AI Architect](https://cybersectools.com/compare/atsign-ai-architect-vs-seasponge)
- [SeaSponge vs ArgusEye](https://cybersectools.com/compare/arguseye-vs-seasponge)

## Alternatives to each

- [See all MoreSec STAC alternatives](https://cybersectools.com/alternatives/moresec-stac)
- [See all SeaSponge alternatives](https://cybersectools.com/alternatives/seasponge)

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Source: https://cybersectools.com/compare/moresec-stac-vs-seasponge

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

More on MoreSec STAC and SeaSponge: 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