Zero-knowledge
We do not hold the client keys needed to decrypt readable workspace content
$0 Free tier
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Quick verdict.
Choose SealTask if you need true end-to-end encryption where even the company can't access your workspace content. It may help with technical safeguards for regulated work. 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. Choose Notion if you prioritize rich features like databases, wikis, and extensive integrations - and you're comfortable with conventional SaaS access controls.
Feature comparison.
| Feature | SealTask | Notion |
|---|---|---|
| End-to-End Encryption | ||
| Zero-Knowledge Architecture | ||
| Self-Hosted Deployment Option | ||
| Provider Can Access Workspace Content | ||
| AI Features Can Process Workspace Content | ||
| GDPR Support | ||
| SOC 2 Certified | ||
| Open Source Crypto | ||
| Data Export | ||
| Team Collaboration | ||
| Kanban Boards | ||
| Rich Text Editing | ||
| Database Features | ||
| Starting price | €0; Personal €5.90/mo; Team €4.90/seat/mo | $10/seat/mo (billed annually) |
AI processing means workspace content may be processed when AI features are enabled or used; it does not mean customer data is used for model training.
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 Notion if...
- You need rich wiki/documentation features
- You want database functionality
- Feature richness outweighs security
- You're comfortable with server-side data access
- You need extensive integrations
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.
Notion: Encryption at Rest.
Notion encrypts data at rest on their servers and in transit using TLS. However, this is conventional SaaS encryption rather than zero-knowledge encryption, so Notion's service can process content for features like search, AI, and support.
Result: Provider-side compromise or authorized access paths could expose plaintext content. Notion can respond to lawful data requests with content it is technically able to access.
Frequently asked questions.
Is Notion end-to-end encrypted?
No. Notion 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 Notion employees see my data?
Notion 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.
Does Notion use my data for AI training?
Notion publishes commitments that customer content is not used to train AI models. Its AI features can still process workspace content when enabled or used. SealTask cannot process encrypted workspace content with server-side AI because we cannot decrypt it.
Can I use Notion 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. Notion offers a BAA path on qualifying Enterprise plans when customers use the required security features.
Which has more workspace features?
Notion has broader wiki, database, and documentation features. SealTask is narrower: encrypted task management, kanban boards, checklists, and collaboration for teams that prioritize content privacy.
Explore private Notion 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 Notion Security & Privacy - Official security documentation
- 02 SealTask security architecture - Zero-knowledge encryption details
- 03 RFC 8439: ChaCha20-Poly1305 - Encryption standard used by SealTask
Ready for true privacy?
Start on the Free tier, or ask about the licensed self-hosted Docker distribution for your own hardware.
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