# KvantPhone vs QCS Post-Quantum Secure Backup (.qtm): side-by-side comparison (2026)

[KvantPhone](https://cybersectools.com/tools/kvantphone) is a commercial [Post-Quantum cryptography](https://cybersectools.com/categories/post-quantum-cryptography) solution by [KvantPhone (Arenim Group)](https://cybersectools.com/companies/kvantphone-arenim-group). [QCS Post-Quantum Secure Backup (.qtm)](https://cybersectools.com/tools/qcs-post-quantum-secure-backup-qtm) is a commercial [Post-Quantum cryptography](https://cybersectools.com/categories/post-quantum-cryptography) solution by [QCS (Quantum Computing Solutions)](https://cybersectools.com/companies/qcs-quantum-computing-solutions). Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best Post-Quantum Cryptography Solutions for Business](https://cybersectools.com/shortlists/best-post-quantum-cryptography-solutions) picks SandboxAQ AQtive Guard, QuSecure QuProtect R3, Venari Adaptive Cryptographic Intelligence Platform and 4 more.

## Side-by-side comparison

| | KvantPhone | QCS Post-Quantum Secure Backup (.qtm) |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | Post-Quantum Cryptography | Post-Quantum Cryptography |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Mid-Market, Enterprise |
| Company | KvantPhone (Arenim Group) | QCS (Quantum Computing Solutions) |
| Headquarters | – | – |

### Use cases and capabilities

| | KvantPhone | QCS Post-Quantum Secure Backup (.qtm) |
|---|---|---|
| Quantum Safe | Yes | Yes |
| Secure Development | Yes | – |
| iOS | Yes | – |
| Android Security | Yes | – |
| Security as a Service | Yes | – |
| Encryption | – | Yes |
| Data Breach | – | Yes |
| GDPR | – | Yes |
| Critical Infrastructure | – | Yes |
| Healthcare | – | Yes |
| Documentation | – | Yes |
| Security Architecture | – | Yes |

### Core features

**KvantPhone**

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

**QCS Post-Quantum Secure Backup (.qtm)**

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

## Which one fits you

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

- [KvantPhone](https://cybersectools.com/tools/kvantphone) fits if you want a cloud product and you are a startup or a small business.
- [QCS Post-Quantum Secure Backup (.qtm)](https://cybersectools.com/tools/qcs-post-quantum-secure-backup-qtm) fits if you need to run it on your own servers.

## KvantPhone vs QCS Post-Quantum Secure Backup (.qtm) FAQ

Common questions when comparing KvantPhone vs QCS Post-Quantum Secure Backup (.qtm) for Post-Quantum cryptography.

### What is the difference between KvantPhone and QCS Post-Quantum Secure Backup (.qtm)?

**KvantPhone**: Encrypted mobile voice & messaging app using post-quantum cryptography, built by KvantPhone (Arenim Group).

**QCS Post-Quantum Secure Backup (.qtm)**: Post-quantum file archive format (.qtm) using Kyber/Dilithium for verifiable, offline, built by QCS (Quantum Computing Solutions).

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

### Who makes KvantPhone and QCS Post-Quantum Secure Backup (.qtm)?

**KvantPhone** is made by KvantPhone (Arenim Group). **QCS Post-Quantum Secure Backup (.qtm)** is made by QCS (Quantum Computing Solutions). The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is KvantPhone a good alternative to QCS Post-Quantum Secure Backup (.qtm)?

Often, yes. KvantPhone and QCS Post-Quantum Secure Backup (.qtm) are both Post-Quantum Cryptography products, and both cover Quantum Safe. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [KvantPhone vs Mumken PQC Platform](https://cybersectools.com/compare/kvantphone-vs-mumken-pqc-platform)
- [KvantPhone vs SylLab Systems](https://cybersectools.com/compare/kvantphone-vs-syllab-systems)
- [KvantPhone vs Arqit SKA-Platform](https://cybersectools.com/compare/arqit-ska-platform-vs-kvantphone)
- [QCS Post-Quantum Secure Backup (.qtm) vs Mumken PQC Platform](https://cybersectools.com/compare/mumken-pqc-platform-vs-qcs-post-quantum-secure-backup-qtm)
- [QCS Post-Quantum Secure Backup (.qtm) vs SylLab Systems](https://cybersectools.com/compare/qcs-post-quantum-secure-backup-qtm-vs-syllab-systems)
- [QCS Post-Quantum Secure Backup (.qtm) vs Arqit SKA-Platform](https://cybersectools.com/compare/arqit-ska-platform-vs-qcs-post-quantum-secure-backup-qtm)

## Alternatives to each

- [See all KvantPhone alternatives](https://cybersectools.com/alternatives/kvantphone)
- [See all QCS Post-Quantum Secure Backup (.qtm) alternatives](https://cybersectools.com/alternatives/qcs-post-quantum-secure-backup-qtm)

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Source: https://cybersectools.com/compare/kvantphone-vs-qcs-post-quantum-secure-backup-qtm

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

More on KvantPhone and QCS Post-Quantum Secure Backup (.qtm): 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