Threema vs Stackfield

Both Threema and Stackfield are European-built, GDPR-compliant solutions in the messaging & chat space. This comparison breaks down their features, pricing, compliance posture, and data residency so you can make an informed choice for your team.

Quick Overview

Threema

Headquarters: Pfaeffikon, CH
Pricing: €5 one-time
Open Source: No

Stackfield

Headquarters: Munich, DE
Pricing: From €11/mo
Open Source: No

Key Differences

Threema costs €5 as a one-time purchase, while stackfield starts at €11/month. The different pricing models mean you should evaluate which approach better fits your usage pattern.
Data residency differs: Threema hosts data in Switzerland, while Stackfield hosts in Germany. If your organisation requires data to stay in a specific EU country, this distinction matters for compliance.
Stackfield holds ISO 27001 certification, providing third-party assurance of its security practices. Threema does not currently hold these certifications, which may matter for enterprise procurement requirements.
Each product has unique strengths: Threema offers End-to-end encryption (NaCl) and No phone number required, while Stackfield provides End-to-end encryption and Task management. Your choice depends on which capabilities matter most for your workflow.

Feature Comparison

Feature	Threema	Stackfield
Name	Threema	Stackfield
Pricing	€5 one-time	From €11/mo
Free Tier
GDPR
ISO 27001
Open Source
Headquarters	Pfaeffikon, CH	Munich, DE
Data Centers	CH	DE
End-to-end encryption (NaCl)
No phone number required
Anonymous Threema ID
Voice and video calls
Group chats and polls
QR code contact verification
Threema Work for enterprises
Threema Broadcast
Open source clients
End-to-end encryption
Task management
Video calls
Document collaboration
Chat channels
Audit logs
Custom workflows
GDPR by design

Pricing Comparison

Threema

€5 one-time

one-time purchase

Stackfield

From €11/mo

subscription

Compliance Comparison

Threema

GDPRDPA

Stackfield

GDPRISO 27001DPA

Get Started

Try Threema

Privacy-first messaging, no phone number required

Visit Threema

Try Stackfield

German encrypted collaboration for teams

Visit Stackfield

How to Choose

Your procurement requires ISO 27001 certification

Choose Stackfield

Threema vs Stackfield — FAQ

What is the main difference between Threema and Stackfield?

Both Threema and Stackfield are European messaging & chat solutions with full GDPR compliance. The key differences lie in their approach: Threema uses one-time purchase pricing while Stackfield uses subscription. Threema is headquartered in Pfaeffikon, Switzerland, while Stackfield is based in Munich, Germany. Your choice should depend on your specific requirements for features, pricing, and data residency.

Which is more affordable, Threema or Stackfield?

Threema costs €5 as a one-time purchase, while stackfield starts at €11/month. Pricing models differ (one-time purchase vs. subscription), so compare based on your usage pattern rather than just the starting price.

Are both Threema and Stackfield GDPR compliant?

Yes. Both Threema and Stackfield are European companies that store data within the EU/EEA and offer Data Processing Agreements. Neither is subject to the US CLOUD Act or FISA surveillance. Additionally, Stackfield holds ISO 27001 certification. For GDPR purposes, either option eliminates the legal risks associated with using US-based services.