Nextcloud vs Stackfield

Confronta Nextcloud e Stackfield su capacità, giurisdizione, garanzie e idoneità per acquirenti europei.

Logo: Stackfield

Stackfield

Germany· Groupware

Needs review

Shortlist Stackfield when you need a German-operated all-in-one (chat + PM + meetings + docs) with optional client-side E2E rooms, Germany hosting, and a BSI C5 / ISO story for regulated teams. Skip when you need open-source DIY (prefer Nextcloud), Slack-scale app ecosystem depth, or pure secure messaging without project management (consider ginlo Business).

EU-operated (DE)Optional client-side E2EGermany hosting (IONOS)ISO 27001 + BSI C5 (claimed)Commercial on-premiseChat + PM + video
Nextcloud vs Stackfield: Sintesi
CaratteristicaLogo: NextcloudNextcloudLogo: StackfieldStackfield
Paese di origineGermanyGermany
CategoriaCloud ComputingGroupware
Open sourceNo
Self-hosted
SedeNon indicatoGermany
Soggetto giuridicoNon indicatoStackfield GmbH, Maximiliansplatz 17, 80333 München, Germany
Capogruppo / controllo USANon indicatoNessuna capogruppo USA nota
Esposizione CLOUD Act (indicativa)Non indicatoMedio
Hosting / residenzaNon indicatoProduct data claimed stored in Germany; infrastructure provider IONOS SE (DE). Vendor states no AWS/GCP/Azure product subcontractors. Named EU processors: Inxmail (email, DE), Myra Security (edge protection, DE). Mobile push uses Apple APNs and Google push services (US platforms). Optional admin-enabled Giphy (US). Marketing site uses Google/Bing ads (not workspace content path). Optional customer-keyed external AI leaves Stackfield’s IONOS-hosted model path.
Riassunto

Open-source, self-hosted content collaboration Hub from Nextcloud GmbH (Germany): Files, Talk, Groupware, Office, local AI Assistant, and Flow—an on-prem alternative to Microsoft 365-style suites.

German all-in-one collaboration suite (chat, tasks/projects, video, docs) with optional client-side end-to-end encryption and Germany-hosted cloud or commercial on-premise.

Tag
A colpo d'occhio: Nextcloud vs Stackfield
A colpo d'occhioLogo: NextcloudNextcloudLogo: StackfieldStackfield
HQNon indicatoMunich, Germany
Legal entityNon indicatoStackfield GmbH (HRB 199536)
FoundedNon indicato2012 (vendor claim)
HostingNon indicatoGermany; IONOS SE (vendor-named)
DeploymentNon indicatoSaaS cloud + commercial on-premise
Open sourceNon indicatoNo
Commercial modelNon indicatoSeat-based plans; trial; AI/Office add-ons
Key capabilities: Nextcloud vs Stackfield
Key capabilitiesLogo: NextcloudNextcloudLogo: StackfieldStackfield
EU-operated (DE)Non indicato
Optional client-side E2ENon indicato
Germany hosting (IONOS)Non indicato
ISO 27001 + BSI C5 (claimed)Non indicato
Commercial on-premiseNon indicato
Chat + PM + videoNon indicato

Nextcloud

  • Sincronizzazione e condivisione file sicura

    Sincronizzazione crittografata tra dispositivi, con link pubblici, permessi e scadenza. Vantaggi: accesso remoto sicuro, nessuna perdita di dati — ideale per team con file sensibili.

  • Collaborazione in tempo reale e Office

    Integrazione Collabora/OnlyOffice per editing documenti live. Talk abilita chat e videoconferenze. Produttività come Google Workspace, ma self-hosted per la privacy.

  • Groupware e suite di produttività

    Calendario, contatti, mail e attività in un'app. Flow automatizza i flussi di lavoro; Assistant usa IA locale per traduzioni e riepiloghi. Centralizza gli strumenti, riducendo la proliferazione di app.

Stackfield

  • Optional client-side E2E rooms (AES-256 + RSA-2048)

    Rooms and direct messages can add browser-side end-to-end encryption so Stackfield cannot read covered content at rest. Admins can force E2E, ban it, or let creators choose. Trade-offs include room-password recovery after login resets, limited lock-screen/email previews, and client-side search cost—plan org policy before migrating sensitive rooms.

  • Tasks, Gantt, portfolios, and workflows in the same rooms as chat

    List/Kanban/Gantt views, milestones, dependencies, automatic scheduling, critical path, custom fields, time tracking, reports, and project portfolios sit next to room chat and discussions. Suited to PMOs that refuse a separate tool silo; less deep than specialist ALM suites for software engineering pipelines.

  • Video conferences, screen share, and guest/external roles

    Built-in audio/video/screen-sharing (plan-dependent) plus guest and external roles that only see assigned rooms. Useful for law firms, agencies, and public-sector projects with outside counsel or contractors without granting full org access.

  • Germany cloud (IONOS) plus commercial on-premise

    Cloud tenants store data in German data centres; Stackfield names IONOS SE as infrastructure provider and claims no AWS/GCP/Azure product subprocessors. On-premise is a paid subscription (vendor-installed/updated, high minimum seat count) for air-gapped or policy-bound estates—test first in cloud; local PoC installs are not offered.

  • Enterprise access controls and in-product DPA

    Higher tiers add enforced 2FA (including YubiKey options), IP allowlists, password policies, SSO, API provisioning, org-wide exports, and compliance-confirmation workflows. Organisation admins can conclude the GDPR DPA inside settings and download the signed PDF once per organisation.

Assurance & compliance: Nextcloud vs Stackfield
Assurance & complianceLogo: NextcloudNextcloudLogo: StackfieldStackfield
Independent security / no-logs auditNon indicato
Partial

Vendor claims regular penetration tests and APPVISORY Trusted App for mobile; no public independent no-logs or full security audit report found.

ISO 27001Non indicato
Vendor claimed

Vendor states ISO 27001 (plus 27017/27018) with certificate download on security page; not independently registry-verified in this draft.

SOC 2 / SOC 3Non indicato
Not found

No SOC 2/3 claim found on primary security pages reviewed.

BSI C5Non indicato
Vendor claimed

Vendor claims BSI C5 attestation on homepage and security page; obtain current report in procurement.

GDPR / EU data protectionNon indicato
Vendor claimed

EU controller Stackfield GmbH; Germany hosting claims; in-product DPA; public privacy policy with processor list fragments.

US CLOUD Act exposure (indicative)Non indicato
Partial

EU entity, no known US parent, core hosting claimed via IONOS DE without AWS/GCP/Azure. Residual paths: Apple/Google mobile push; optional Giphy; optional customer external AI. Assessment only—not legal advice.

Data processing agreement (B2B)Non indicato
Vendor claimed

Organisation admins can conclude DPA inside Organisation Settings and download signed PDF; one DPA per organisation.

EU AI ActNon indicato
Not applicable

Optional text-assist AI add-on; not an AI-centric product. Revisit if agents expand into high-risk use cases.

Considerations & known limitations: Nextcloud vs Stackfield
Considerations & known limitationsLogo: NextcloudNextcloudLogo: StackfieldStackfield
E2E is optional and irreversible per roomNon indicato
Medium

Without org policy, creators may leave sensitive rooms unencrypted. Encryption mode cannot be changed after creation; password recovery after login reset needs disciplined room-key handling.

Mobile push and optional US integrationsNon indicato
Medium

Privacy policy documents Apple/Google push for mobile notifications and optional Giphy (US). Even with German content hosting, notification metadata and optional GIF traffic can touch US platforms—document in DPIA.

Certifications vendor-assertedNon indicato
Low

ISO and BSI C5 are claimed with a downloadable certificate; treat as claimed until your auditor verifies scope, dates, and which systems are in-bounds.

On-premise is commercial, not DIY open sourceNon indicato
Low

Self-host means a paid on-prem product with vendor install/update and high seat minimums—not a free community edition. Budget implementation and support tickets accordingly.

AI features require content decryption for processingNon indicato
Medium

Stackfield AI decrypts client-side content for the request path (then claims immediate deletion). External AI via customer keys is a separate transfer. Disable AI if zero-knowledge must never leave the client.

Idoneità

Nextcloud

Best fit when

Non indicato

Poor fit when

Non indicato

Stackfield

Best fit when

  • German/EU orgs that want one tool for projects and communication instead of Slack + separate PM
  • Teams that need optional zero-knowledge rooms for highly sensitive matters (legal, M&A, HR, clinical ops)
  • Buyers requiring German legal entity, DPA in-product, and claimed ISO/BSI C5 for procurement questionnaires
  • Public sector, banking, insurance, and professional services evaluating cloud with an on-prem exit path
  • Orgs that will enforce 2FA/SSO/IP allowlists and guest-only access for externals

Poor fit when

  • Teams that need always-on E2E with full rich push previews and third-party calendar feeds without trade-offs
  • Engineering orgs standardised on Jira/GitHub-style ALM depth and automation
  • Buyers who require fully open-source, community-supported self-host without a commercial on-prem contract
  • Global enterprises whose primary requirement is the Slack/Teams integration marketplace
  • Very small teams needing only free-tier messaging with no seat-based SaaS commitment

Consider instead when

  • When: You need open-source self-host and full operational control of files/collab apps

    Consider: Nextcloud

    More DIY ops; broader app ecosystem; different PM depth.

  • When: You mainly need regulated secure messaging, not Gantt/portfolios

    Consider: ginlo Business

    Messaging-first German B2B chat; thinner project suite.

  • When: You already run Microsoft 365 and identity is non-negotiable

    Consider: Microsoft Teams (incumbent) or stay in M365 with EU data boundaries

    Teams wins on suite lock-in; loses on independent German vendor + optional client E2E story.

  • When: You want lighter EU team chat without full PM suite

    Consider: Fleep

    Chat-centric; different residency/subprocessor profile—verify separately.

Open questions for due diligence

Nextcloud

Non indicato

Stackfield

  • Will the vendor provide the current BSI C5 report, ISO certificate scope, and full subprocessor annex under NDA if not already in the DPA PDF?
  • Which fields remain outside E2E (metadata, search indexes, analytics) in your planned room configuration?
  • For mobile fleets: is APNs/FCM push acceptable, or must notifications be disabled/restricted?
  • On-premise: exact supported OS/hypervisor matrix, backup model, and upgrade cadence for your estate?
  • Is Stackfield AI (or customer external AI) allowed under your policy for rooms that contain special-category data?