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

[OpenFHE](https://cybersectools.com/tools/openfhe) is a free [Post-Quantum cryptography](https://cybersectools.com/categories/post-quantum-cryptography) solution. [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

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

### Use cases and capabilities

| | OpenFHE | QCS Post-Quantum Secure Backup (.qtm) |
|---|---|---|
| Encryption | Yes | Yes |
| Open Source | Yes | – |
| Quantum Safe | – | Yes |
| Data Breach | – | Yes |
| GDPR | – | Yes |
| Critical Infrastructure | – | Yes |
| Healthcare | – | Yes |
| Documentation | – | Yes |
| Security Architecture | – | Yes |

### Core features

**OpenFHE**

No features listed.

**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.

- [OpenFHE](https://cybersectools.com/tools/openfhe) fits if you need a free product.

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

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

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

**OpenFHE**: OpenFHE is an open-source library implementing post-quantum Fully Homomorphic Encryption schemes with simplified APIs and cross-platform support.

**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.

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

Often, yes. OpenFHE and QCS Post-Quantum Secure Backup (.qtm) are both Post-Quantum Cryptography products, and both cover Encryption. Key differences: OpenFHE is Free while QCS Post-Quantum Secure Backup (.qtm) is Commercial. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [OpenFHE vs Mumken PQC Platform](https://cybersectools.com/compare/mumken-pqc-platform-vs-openfhe)
- [OpenFHE vs SylLab Systems](https://cybersectools.com/compare/openfhe-vs-syllab-systems)
- [OpenFHE vs Arqit SKA-Platform](https://cybersectools.com/compare/arqit-ska-platform-vs-openfhe)
- [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 OpenFHE alternatives](https://cybersectools.com/alternatives/openfhe)
- [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/openfhe-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/openfhe.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on OpenFHE 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