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 you need private team task collaboration, a stricter zero-knowledge model, and a licensed self-hosted Docker option. Choose Lunatask if you want a polished personal productivity system with encrypted task text, habits, mood tracking, journaling, calendar time blocking, and relationship tracking, and you accept unencrypted task metadata in a cloud-based service.
Feature comparison.
| Feature | SealTask | Lunatask |
|---|---|---|
| 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 | ||
| Rich Text Editing | ||
| Time Tracking | ||
| Calendar & Reminders | ||
| Personal Free Plan | ||
| Habit Tracking | ||
| Mood & Journal Tracking | ||
| Relationship Tracking | ||
| Starting price | €0; Personal €5.90/mo; Team €4.90/seat/mo | Free; Premium $6/mo annually or $8/mo monthly |
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 Lunatask if...
- You want one personal app for tasks, habits, mood, journaling, notes, and relationships
- End-to-end encryption for entered content is enough, even if some metadata is unencrypted
- Calendar time blocking, task timers, WIP limits, and prioritization methods are central
- A free individual plan or low-cost Premium plan matters more than team controls
- You do not need self-hosting or formal team workspace collaboration
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.
Lunatask: encrypted personal productivity with metadata tradeoffs.
Lunatask says the data users type into tasks, notes, habits, journal entries, relationships, and similar records is encrypted on the device before cloud sync. Its docs say Lunatask does not know the private key, keeps no backdoor to encrypted data, and uses Curve25519, XSalsa20, Poly1305, Argon2id, and NaCl.
Result: The important difference is metadata. Lunatask explicitly says it is not fully zero-knowledge because task metadata such as status, priority, and assigned dates is stored unencrypted. It is a cloud service stored in AWS US East 1, not a self-hosted deployment.
Frequently asked questions.
Is Lunatask end-to-end encrypted?
Yes for user-entered content such as task text, notes, habits, journal entries, and relationship details. Lunatask says that data is encrypted on the device and that it does not have the private key. Its docs also say some metadata, including task status, priority, and assigned dates, is stored unencrypted, so it is not fully zero-knowledge.
Can Lunatask employees see my data?
Lunatask says it cannot access encrypted task, note, journal, habit, or relationship content and keeps no backdoor to encrypted data. Its servers can still store and process some unencrypted metadata. SealTask is designed around a stricter zero-knowledge boundary for team task workspace content.
Can I use Lunatask 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. Lunatask publishes encryption and privacy documentation, but not a HIPAA or BAA program.
When should I choose Lunatask instead of SealTask?
Choose Lunatask for personal life management: habits, mood and energy tracking, journaling, relationship tracking, time blocking, timers, and multiple prioritization workflows. Choose SealTask when the main requirement is encrypted team task collaboration and stricter zero-knowledge boundaries.
Explore private Lunatask 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 Lunatask pricing - Free, Premium, annual, monthly, and lifetime pricing
- 02 Lunatask encryption and privacy - End-to-end encryption, metadata limits, algorithms, storage, and tracking policy
- 03 Lunatask task and productivity features - Task workflows, integrations, habits, relationships, timers, and export limitations
- 04 SealTask privacy policy - GDPR-aligned data processing, legal bases, transfers, retention, and privacy rights
- 05 SealTask security architecture - Zero-knowledge encryption details
- 06 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.
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