gpg4o vs MailHippo
gpg4o
bayoosoft.comMailHippo
mailhippo.comSide by side
| Figure | gpg4o | MailHippo |
|---|---|---|
| Price from | €99.95/mo | $4.95/mo |
| Free plan | Yes | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| API | — | Yes |
| Plans published | 5 | 5 |
| Spec score · Email Encryption Software | 8.7 (#5) | 8.8 (#2) |
| Spec score · File encryption tools | 8.4 (#11) | 8.7 (#6) |
| Admin access controls | Yes | Yes |
| Encryption | It uses asymmetric encryption with private and public keys and follows the OpenPGP standard. | MailHippo uses SSL/TLS 1.2 or higher in transit, AES-256 encryption for message bodies and attachments at rest, and encrypts the key ring. |
| Free plan | Yes | No |
| Gmail integration | No | Yes |
| Headquarters | Darmstadt, Germany | Pompano Beach, Florida, United States |
| Message expiry | No | Yes |
| Outlook integration | The add-in provides end-to-end encryption directly through the Outlook interface. | Yes |
| Recipient verification | identity | password |
| Secure delivery | attachment | portal |
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
MailHippo
- 30 Day TrialFree
- Basic$4.95 a month
- Pro$7.95 a month
- Basic Plan$4.95 a month
- Pro Plan$7.95 a month
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.
MailHippo
MailHippo is a secure email messaging platform designed to protect patient data with HIPAA-compliant email. It works with a user's existing email address and provider, and MailHippo says users can begin sending and receiving encrypted messages without setup or configuration. SendSafe provides a personalized URL through which anyone can send an encrypted message to a MailHippo inbox, including people without a subscription. Messages use SSL/TLS 1.2 or higher in transit, while message bodies and attachments are protected with AES-256 encryption at rest; the key ring is also encrypted. Every plan includes a HIPAA Business Associate Agreement, and message-access records include the authorized user, date, time, and records accessed. The API supports attachments, CC/BCC, HTML content, and inbound messages through a webhook. Basic costs $4.95 a month per user and Pro costs $7.95 a month per user; both are month-to-month. A 30-day trial is available, and there is no free plan. MailHippo was founded in 2019 and is headquartered in Pompano Beach, Florida.