Zero-knowledge
We do not hold the client keys needed to decrypt readable workspace content
$0 Free tier
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500+ professionals
Trusted by privacy-focused teams
Quick verdict.
Choose SealTask if private task content and zero-knowledge encryption matter more than suite breadth. Choose KanbanFlow if its specialized workflow is the primary requirement. KanbanFlow is stronger for timers, WIP limits, swimlanes, and lightweight productivity reporting. SealTask focuses on private team task content.
Feature comparison.
| Feature | SealTask | KanbanFlow |
|---|---|---|
| End-to-End Encryption | ||
| Zero-Knowledge Architecture | ||
| Self-Hosted Deployment Option | ||
| Provider Can Access Workspace Content | ||
| GDPR Support | ||
| Open Source Crypto | ||
| Data Export | ||
| Team Collaboration | ||
| Kanban Boards | ||
| Time Tracking | ||
| Calendar & Reminders | ||
| Granular Team Activity Logs | ||
| Starting price | €0; Personal €5.90/mo; Team €4.90/seat/mo | Free; Premium $5/user/mo |
Want the private option?
Try SealTask in the hosted cloud, or talk to us about the licensed self-hosted Docker image for your own hardware.
Who should choose which?
Choose SealTask if...
- You handle sensitive client or internal project data
- You need strong encryption for regulated workflows
- You do not want server-side AI processing workspace content
- You prefer focused task management over a broad work OS
- You want the provider unable to read encrypted content
- You want a licensed self-hosted Docker option on your own hardware
Choose KanbanFlow if...
- You need Pomodoro and stopwatch tracking
- WIP limits and swimlanes are central
- Low-cost kanban is the main buying reason
- Your boards do not contain sensitive content
Security architecture.
SealTask: zero-knowledge.
SealTask encrypts readable workspace content on your device with ChaCha20-Poly1305 before sync. The client unlocks keys with an OPAQUE export key plus HKDF, and optional one-time backup keys stay user-held. The service does not hold the keys needed to decrypt that content; account and operational metadata remain server-visible.
Result: A database breach or legal demand can expose ciphertext and server-visible account, billing, security, audit, service, and workspace metadata. SealTask cannot decrypt readable workspace content without the client-held keys.
KanbanFlow: conventional SaaS security.
KanbanFlow publishes standard security, privacy, or compliance information for cloud collaboration, but it does not position the product as SealTask-style client-side end-to-end encrypted task management. KanbanFlow is stronger for timers, WIP limits, swimlanes, and lightweight productivity reporting. SealTask focuses on private team task content.
Result: That means KanbanFlow can operate, index, support, or process workspace content in ways a zero-knowledge task app intentionally avoids. Use SealTask when provider-readable task content is the core risk.
Frequently asked questions.
Is KanbanFlow end-to-end encrypted?
No. KanbanFlow publishes encryption at rest and in transit, but not SealTask-style client-side end-to-end encryption. That means the service can process workspace content in plaintext for product features and authorized support workflows.
Can KanbanFlow employees see my data?
KanbanFlow publishes access controls and policies limiting employee access, but its architecture still permits authorized server-side access to workspace content. With SealTask's zero-knowledge architecture, even our engineers cannot access encrypted workspace content because we do not have the keys.
Can I use KanbanFlow or SealTask for HIPAA-regulated PHI?
Do not treat either product as HIPAA-ready by default. SealTask's zero-knowledge design may help with technical safeguards. Before any PHI use, SealTask must expressly agree in writing. Where HIPAA applies, SealTask and the customer must execute a HIPAA-compliant BAA before use. KanbanFlow does not publish a HIPAA or BAA program for regulated health workflows.
When should I choose KanbanFlow instead of SealTask?
KanbanFlow is stronger for timers, WIP limits, swimlanes, and lightweight productivity reporting. SealTask focuses on private team task content.
Explore private KanbanFlow alternatives
How do task tools' security track records compare?
We maintain dated, source-linked records of publicly documented security incidents across task-management vendors — what happened, how each event is classified, what the sources establish, and why Have I Been Pwned coverage is not the same as incident history.
Browse the incident recordsComparing for a specific kind of private work?
The guide library adds audience-specific workflows, metadata caveats, and system-of-record decisions for legal, people, executive, startup, consulting, and private-practice work.
Browse audience guidesReferences.
- 01 KanbanFlow pricing - Official pricing and plan documentation
- 02 KanbanFlow features - Official feature documentation
- 03 KanbanFlow privacy policy - Official privacy and GDPR information
- 04 SealTask security architecture - Zero-knowledge encryption details
- 05 RFC 8439: ChaCha20-Poly1305 - Encryption standard used by SealTask
Need private team tasks?
Start on the Free tier, or ask about the licensed self-hosted Docker distribution for your own hardware.
Start free