gpg4o vs Gpg4win
gpg4o
bayoosoft.comGpg4win
gpg4win.orgSide by side
| Figure | gpg4o | Gpg4win |
|---|---|---|
| Price from | €99.95/mo | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Windows | Yes | Yes |
| Plans published | 5 | 1 |
| Spec score · Email Encryption Software | 8.7 (#5) | 8.2 (#12) |
| Spec score · File encryption tools | 8.4 (#11) | 7.9 (#14) |
| Admin access controls | Yes | Yes |
| Free plan | Yes | Yes |
| Outlook integration | The add-in provides end-to-end encryption directly through the Outlook interface. | Yes |
| Recipient verification | identity | identity |
| Secure delivery | attachment | attachment |
Plans
gpg4o
- gpg4o€99.95 a month
- gpg4o FreeFree
- gpg4o – Extension product maintenance 1 year€5,195 a year
- gpg4o – Extension product maintenance 3 years€13,995 a year
- gpg4o€9,995, paid once
In their own words
gpg4o
gpg4o is a Microsoft Outlook add-in for encrypting, decrypting, signing, and checking messages and attachments. It uses public and private keys under the OpenPGP standard, and supports encrypted HTML email, PGP/MIME, and PGP/Inline. Its key management can synchronize keys, use local or public key servers, and check the Web of Trust; central management requires Enterprise KeyServer. The product also supports terminal servers, Microsoft Policy Manager, automatic key generation, and working groups. When encryption is enabled, it protects message text and attachments, but not the subject line or recipient list. The current feature page lists Outlook 2024 or 365 Classic on Windows 11 and marks Mac OS unsupported. A limited free version is available without a time limit, and a 180-day trial is noted. The listed gpg4o plan costs €99.95 a month. After maintenance expires, users can still send and read encrypted or signed email, but they do not receive further updates.