Dev tools · alternatives · 2026

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   SasaSavic Quantum Shield™▲6

   Quantum-secure timestamping for verifiable digital proofs

   Nov 2025 · sasasavic.ca · its alternatives →

2. 2
   Neptune.io, A self-healing platform to fix server alerts automatically▲66

   Neptune is a quantum-safe layer 1 blockchain combining zk-STARKs and PoW consensus. Private by default, programmable, and built for global scale

   2014 · neptune.io · its alternatives →

3. 3
   filippo.io/mlkem768 – Post-Quantum Cryptography for the Go Ecosystem▲315

   filippo.io/mlkem768 is a pure-Go implementation of the post-quantum key exchange mechanism ML-KEM-768 optimized for correctness and readability.

   2024 · words.filippo.io · its alternatives →

4. 4
   TimeSeal▲116

   Restoring digital trust, one blockchain timestamp at a time

   2023 · timeseal.com · its alternatives →

5. 5
   Qpher▲4

   Post-quantum encryption & signing — drop-in REST APIs

   Jun 2026 · qpher.ai · its alternatives →

6. 6
   QU3▲133

   Quantum-safe MCP servers for private, verifiable inference

   2025 · its alternatives →

7. 7
   FractalCrypt 2.0 – free deniable encryption cryptoarchiver▲128

   Free cross-platform deniable encryption cryptoarchiver - GitHub - zorggomat/FractalCryptGUI: Free cross-platform deniable encryption cryptoarchiver

   2021 · github.com · its alternatives →

8. 8BT
   btproof - trusted timestamping on the Bitcoin blockchain▲75

   Find information, resources and relevant links for btproof.com. This domain may be for sale.

   2013 · btproof.com · its alternatives →

9. 9
   Claimby▲107

   Free legally-valid timestamps for your files, ideas & art.

   2018 · claimby.com · its alternatives →

10. 10SV
    Seal – Verifiable timestamp for your private ideas▲113

    2022 · docs.planet.ink · its alternatives →

11. 11
    Prefixed, dual-token, base58 encoded API Keys▲100

    Module for generating a prefixed API Key. Contribute to seamapi/prefixed-api-key development by creating an account on GitHub.

    2022 · github.com · its alternatives →

12. 12
    Forward Email – Open-Source Quantum Safe Encrypted Email Service▲35

    Get free email forwarding for custom domains. Send & receive as [email protected] with unlimited aliases, 10GB storage, IMAP/POP3/SMTP & 100% open-source security. Trusted by 500K+ users. Setup in 2 minutes.

    2023 · forwardemail.net · its alternatives →

13. 13
    yousaidthat.org▲63

    Prove that you said things before anyone else

    Jun 2026 · yousaidthat.org · its alternatives →

14. 14
    CryptoProof – post proofs to the Ethereum blockchain for free▲55

    CryptoProof ran from 2018 to 2021, as a free timestamping service on Ethereum.

    2018 · cryptoproof.org · its alternatives →

15. 15
    Quantum-Lattice▲3

    Post - Quantum Blockchain (ML-DSA-65)

    Jul 2026 · quantum-lattice.futuristicai.co.za · its alternatives →

16. 16TP
    TutaCrypt, post-quantum encryption protocols for securing emails [pdf]▲15

    Hi HN, we are the developers from Tuta (formerly Tutanota), the German end-to-end encrypted email provider, and we recently released the world's first post-quantum encryption for email. We have included a full technical write-up of the cryptography involved in these changes and we have released it for open public review. This document specifies TutaCrypt, a protocol designed for hybrid email encryption in Tuta Mail. The protocol combines a classical Elliptic-Curve-Diffie-Hellman key exchange with a post-quantum KEM. The goal is to replace the usage of RSA in Tuta Mail. In the remainder of…

    2024 · tuta.com · its alternatives →

17. 17
    Quantum-Safe Cryptocurrency▲6

    Pitch, Idea, Discussion, Help, Launch, Crypto, Startup

    2025 · github.com · its alternatives →

18. 18EE
    Encrypted emails based on Signal protocol with post-quantum algorithms▲10

    Hi HN, we have recently completed a research project on how to encrypt emails with post-quantum secure algorithms as well as Forward Secrecy. We'd love to hear your feedback and discuss technical issues. The paper can be found here: https://eprint.iacr.org/2021/875

    2021 · its alternatives →

19. 19
    Stampd.io - A document blockchain stamping service▲32

    Use the public blockchains to timestamp your files with indelible proof. Create non-fungible tokens (NFT) in Cardano.

    2015 · stampd.io · its alternatives →

20. 20BC
    Bitcoinproof - Create a forgery-proof timestamp for your data▲8

    2013 · vog.github.io · its alternatives →

21. 21
    XSigi▲7

    Blockchain-secured signatures and encryption made simple.

    2025 · its alternatives →

22. 22
    Access Vault▲21

    Post-Quantum Credential Management Made Easy

    2025 · accessvault.app · its alternatives →

23. 23
    TimeProof▲5

    Prove it existed. Permanently.

    Jan 2026 · its alternatives →

24. 24
    SBIX Certify▲13

    ✨ Instant legal proof-of-existence for any document.

    Dec 2025 · certify.sbix.io · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →