Stackfield

Stackfield is the Munich-based end-to-end-encrypted team-collaboration platform operated by **Stackfield GmbH** (Maximiliansplatz 17, 80333 Munich; HRB 199536 Local Court Munich; VAT DE283871998; managing director Cristian Mudure). Founded in 2012 by Christian Mudra and Christopher Diesing, the company serves 10,000+ companies with a single workspace that combines team chat, tasks, project management, document sharing, whiteboards, video conferencing, and email forwarding — positioned explicitly as the European E2E-encrypted alternative to Slack, Microsoft Teams, Asana, and Basecamp. Compliance posture is among the strongest in the project-management category. The product is **end-to-end encrypted with AES-256** applied in the browser before content is transmitted, meaning even Stackfield's own employees cannot read customer messages, files, or tasks. The company holds **ISO/IEC 27001** certification and **BSI C5** (the German government's Cloud Computing Compliance Criteria Catalogue) — the same combination that anchors Hetzner, IONOS, and STACKIT at 5/5 in the hosting category. All customer data is stored exclusively in **German data centres** with location-independent backup. In 2024 Stackfield raised a double-digit-million investment to scale the privacy-first product; founder-led, with no US-VC / US-PE involvement on record. Pricing in EUR is straightforward: Starter €9/user/month (up to 10 users, 6 GB storage, 3 rooms); Business €14/user/month (unlimited rooms and users); Premium €18/user/month (most popular — whiteboards, email forwarding, full video conferencing); Enterprise €28/user/month (SSO, API provisioning, unlimited organisations). 14-day trial of Premium with no credit card; AI add-on €3.90/user/month; Office editing add-on €2.40/user/month from Premium up. Best fit: German and DACH organisations that need a Slack/Teams replacement with E2E encryption by default, BSI C5 / ISO 27001 evidence for procurement, and a Munich-rooted vendor. Combined with Nextcloud (self-host) and MeisterTask (DE, listed below), Stackfield forms a strong "Microsoft 365 alternatives" cluster.