Posteo vs Runbox

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Posteo compared with Runbox
Detail	Posteo	Runbox
What it does	Green, Secure, Ad-free Email Service	Sustainable, Private & Secure Email — Made in Norway
Stage	Established	Established
Founded	2009	2000
Based in	DE	NO
Pricing model	subscription	subscription
Pricing	1 EUR per month with 4 GB storage, upgradeable. Includes email account, calendar, address book, and free support.	Plans start at €1.66/month for Micro plan (2 GB storage), €2.91/month for Mini (10 GB), €4.16/month for Medium (25 GB), €6.66/month for Max (50 GB), €10/month for Max100 (100 GB), and €15/month for Max250 (250 GB). Additional subaccounts from €0.66/month. All plans include 30-day free trial, 60-day
Key features	4 GB email storage, upgradeable Two-factor authentication (TOTP) Encrypted email, calendar and address book Calendar synchronization via CalDAV Address book synchronization via CardDAV PGP and S/MIME encryption Self-developed migration service Crypto mail storage for entire mailbox Anonymous payment option Multiple colors and Dark Mode	Email with IMAP, POP, SMTP, and Web access Calendar with CalDAV support Contacts with CardDAV support Spam and virus filtering File storage with FTP support Plus addressing for inbox organization Email address never recycled
What makes it different	100% ad-free with no user tracking or data trading Powered by 100% green energy from Green Planet Energy Anonymous signup and payment without personal data collection Comprehensive encryption at the touch of a button for laypeople and professionals Self-developed encrypted migration service with no third-party involvement	100% renewable energy powered infrastructure in Norway Independent and employee-owned business model No data tracking or monetization Protected by Norwegian privacy law and GDPR Over 25 years of email service expertise
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	73 no change since last check	66 no change since last check
Trust Flow (Majestic)	36	64
Citation Flow (Majestic)	50	46
Referring domains (Majestic)	3509	1676

8 details filled in for both companies.

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