· Guías
Encrypted notes and files on Android: the guide
How to encrypt notes, documents and photos on Android so the server can’t read them: a step-by-step guide to Filarr, with screenshots.
Mathis Belouar-Pruvot
Blog: nube cifrada, toma de notas y privacidad.
Guías, comparativas y novedades de Filarr. 49 artículos en inglés.
GuíasIs Hosting Data Outside the EU a GDPR Risk? What It Really Means and How to Limit It
Hosting data outside the EU is not automatically illegal under GDPR, but it is a regulated transfer. Here is the real risk, the CLOUD Act nuance, and how to limit it.
NovedadesFilarr 3.6: complete tasks, “To tidy”, a Folders page, and what comes next
Three releases in one week: an Evernote-style Tasks tab, a page that files your documents for you, a Folders page, and a run of fixes against silent data loss. Then what is already on the web and coming to the desktop.
NovedadesFilarr is on Android: how it works, and what comes next
The Filarr Android app is available on Google Play. Three ways to start, the pairing that moves your key from one device to another without going through us, what the phone can do, what it cannot do yet, and what comes next.
GuíasHow to Set Up Bring-Your-Own-Storage (S3) Sync in Filarr
Set up bring-your-own-storage (S3) sync in Filarr: prepare a bucket, add your provider, test the connection. Files are encrypted on your device before upload.
GuíasFreelancers and Consultants: How to Protect Your Clients' Data Without an IT Department
How freelancers and consultants can protect client data without an IT department: four high-leverage controls, GDPR basics, and honest tool trade-offs for 2026.
GuíasHow to Organize Your Notes and Files Together Using a Graph
Learn how to connect notes, files and folders with wiki-links and use Filarr's graph view to find anything by following connections instead of digging through folders.
ComparativasIs Proton Drive Really Zero-Knowledge? An Honest, In-Depth Answer (2026)
Is Proton Drive really zero-knowledge? Yes on file contents, names and folders, with honest caveats on metadata, browser trust and audits. Compared with Filarr.
GuíasIs WeTransfer Encrypted? What Actually Protects Your Files (and What Doesn't) in 2026
Is WeTransfer encrypted? Yes in transit and at rest, but not end-to-end: WeTransfer holds the keys and can read your files. Here is what that means and how to send files safely.
GuíasIs iCloud Drive End-to-End Encrypted? The Advanced Data Protection Nuance That Actually Matters (2026)
Is iCloud Drive end-to-end encrypted? By default no, Apple holds the keys. Turn on Advanced Data Protection and it is. Here is the nuance that actually matters.
GuíasIs Obsidian Sync End-to-End Encrypted? What It Actually Protects (2026)
Is Obsidian Sync end-to-end encrypted? Yes, but only in transit and on the server. Your local vault stays plain text. Here is what it protects and what it does not.
GuíasZero-Knowledge vs End-to-End vs Encrypted at Rest: The Concrete Differences (2026)
Encrypted at rest, end-to-end, zero-knowledge: what's the real difference? What each protects against, what leaks in a breach, and how to tell them apart.
Casos de usoYour Second Brain, Kept Actually Private: How to Run Your Notes, Files, and Ideas From One Place
Build a second brain that keeps notes, files and a linking graph in one place: capture fast, link ideas, search inside PDFs, and find anything in seconds.
GuíasWhere Should Therapists and Health Professionals Store Patient Notes? (Medical Secrecy + GDPR, 2026)
Where should therapists store patient notes under medical secrecy and GDPR? A practical, honest guide to encryption, HDS hosting, zero-knowledge storage and retention.
GuíasHow to Back Up Your Encrypted Notes Without Breaking Zero-Knowledge
Back up encrypted notes without leaking them: use encrypted archives, zero-knowledge sync, and offline recovery keys so copies survive disaster but stay private.
ComparativasEncrypted Google Keep Alternative: Private Notes That Actually Respect Your Data (2026)
Google Keep encrypts your notes but Google holds the keys and can read them. Here is Filarr, a local-first, zero-knowledge encrypted Google Keep alternative, compared honestly.
GuíasGDPR and Client Document Storage for Accounting Firms: How to Stay Compliant in 2026
How accounting firms can store client documents and stay GDPR compliant: what Article 32 really requires, encryption vs zero-knowledge, retention, and a checklist.
NovedadesFilarr Mobile, Week in Progress: Making Sync Honest
This week on the Filarr mobile app: five sync fixes, two new permanent error states, a home screen that finally shows your real storage usage, and 3,326 tests green.
ComparativasEncrypted Evernote Alternatives in 2026: A Founder's Honest Guide to Getting Your Notes Off Someone Else's Server
A long-form, honest founder's guide to encrypted Evernote alternatives in 2026...
GuíasLocal Encryption vs Classic Cloud: What Actually Changes When Your Data Leaks
Classic cloud vs local encryption: in a data breach, one leaks your readable documents, the other leaks unreadable noise. Here is exactly what changes and why.
ComparativasSelf-Hosted Notion Alternatives That Actually Encrypt Your Data (2026): A Founder's Honest Guide
Long-form honest guide separating two things people conflate about self-hosted Notion alternatives: owning the server versus the server being unable to read your data...
NovedadesFilarr Just Passed 1,000 Users: What We're Shipping Next (Mobile, Web, and More)
Filarr just passed 1,000 users. Next up: an encrypted mobile app in final testing, a web app, and a big desktop update, all within one to two months.
ComparativasIs Notion Encrypted? What Privacy-Conscious Users Actually Need to Know (2026)
Is Notion encrypted? Yes at rest with AES-256, but not end-to-end, and Notion holds the keys. What that means for your privacy, and the zero-knowledge alternative.
ComparativasBest Encrypted Note-Taking Apps in 2026: A Founder's Honest, In-Depth Guide
The best encrypted note-taking apps in 2026 compared honestly: Standard Notes, Notesnook, Joplin, Obsidian, Anytype, Proton Docs, Cryptee and Filarr, by use case.
Casos de usoHow to Manage Projects and Tasks Without Scattering Them Across Five Apps
Stop spreading projects across five apps. See how to keep notes, tasks, and files together in one connected workspace, with checklists, links, tags, and fast search.
GuíasHow to Move Your Notion Workspace to a Private, Encrypted App Without Losing a Single Page
Move your Notion workspace to a private, encrypted local-first app without losing pages or attachments. Step-by-step export, import, and verification guide.
ComparativasNotesnook vs Filarr: Two Encrypted Workspaces, Two Very Different Bets
Notesnook vs Filarr compared: encryption, sync, pricing, mobile and open source. Which encrypted notes or workspace app fits your files, notes and privacy needs.
Casos de usoStop Losing Files: A Calmer Way to Manage Your Documents and Notes
Tired of losing files across apps? See how Filarr keeps documents and notes in one place with links, tags, search and a graph view, so you find anything fast.
GuíasHow Filarr's optional cloud sync stays zero-knowledge (a look inside the code)
How Filarr's optional cloud sync stays zero-knowledge: files upload already-encrypted, the server stores only opaque blobs, and your key never reaches it in cleartext.
ComparativasEncrypted Notion Alternatives in 2026: A Founder's Honest Guide to Private, Local-First, End-to-End Encrypted Workspaces
The best private, end-to-end encrypted Notion alternatives in 2026 compared honestly: Filarr, Standard Notes, Anytype, Notesnook, Joplin, Obsidian and Proton Docs.
GuíasHow to Encrypt Your Notes: A Practical Privacy Guide
A practical guide to encrypting your notes: threat models, full-disk vs client-side encryption, secure sync, recovery phrases, and honest tool trade-offs.
Casos de usoHow to Organize Your Whole Digital Life in One Private Workspace
Keep your notes, files and projects in one workspace: link a PDF to a note, search inside documents, and find anything in seconds. Private by default, free for local use.
ComparativasJoplin vs Filarr: Two Encrypted Note Apps, Two Very Different Bets
Joplin vs Filarr compared: opt-in E2EE Markdown notes vs encryption-by-default local-first workspace. Crypto, sync, recovery, pricing and licensing, honestly.
ComparativasAnytype vs Filarr: Two Local-First Encrypted Knowledge Apps, Honestly Compared
Anytype vs Filarr compared honestly: two local-first, end-to-end encrypted knowledge apps. Data model, encryption, sync, recovery, pricing and which to pick.
ComparativasProton Drive vs Filarr: Encrypted Cloud Storage vs a Local-First Encrypted Workspace
Proton Drive vs Filarr compared in depth: encrypted cloud storage vs a local-first encrypted workspace. Encryption, sync, recovery, pricing, and who should pick which.
ComparativasStandard Notes vs Filarr: Two Honest Approaches to Encrypted Notes, Compared in Depth
Standard Notes vs Filarr compared in depth: encryption, threat models, sync, recovery, pricing and licensing of two honest encrypted notes approaches.
NovedadesIntroducing Filarr Sharing: End-to-End Encrypted Files, With or Without an Account
Filarr now lets you share any file as an encrypted link. The decryption key lives in the URL fragment — the part after the # that browsers never send to servers. Here's what just shipped, how the trick works, and what we actually see on the server (almost nothing).
ComparativasBest Local-First Apps in 2026 (Ranked by Use Case)
A ranked list of the best local-first applications in 2026 — notes, files, knowledge management, project management, and team docs. Honest pros and cons, current pricing, and which app fits which workflow.
ComparativasObsidian vs Filarr: Encrypted Notes Head-to-Head (2026)
Obsidian and Filarr are both local-first note-taking apps, but they make different trade-offs. Encryption, plugins, sync, mobile, license — here's an honest, side-by-side comparison so you can pick the right one.
ComparativasNotion alternatives that respect your privacy (2026)
Notion stores your data on its servers and holds the encryption keys. Here are the credible privacy-first alternatives in 2026 — encrypted by default, local-first, or open source — with current pricing and a migration path for each.
GuíasKEK and FEK explained: why per-file encryption matters
KEK (Key Encryption Key) and FEK (File Encryption Key) form the two-layer key hierarchy used by serious encrypted apps — Signal, BitLocker, Apple's File Protection, Filarr. Here's what each one does, why one global key is dangerous, and what a correctly designed encryption layout looks like.
GuíasEnd-to-end vs zero-knowledge encryption: what's the difference?
End-to-end encryption and zero-knowledge encryption are often used interchangeably, but they describe different things. Here's the precise difference, where they overlap, and which one to look for in your messaging app, password manager, and notes app.
GuíasZero-knowledge encryption explained
Zero-knowledge encryption is the architecture where the service hosting your data cannot read it — even if it wants to, even if it's hacked, even if it's subpoenaed. Here's how it works in plain language, with diagrams.
GuíasWhat is AES-256-GCM and why it matters for note-taking apps
AES-256-GCM is the authenticated encryption mode used by Signal, 1Password, WireGuard, and TLS. Here's what each part of the name means, why GCM beats CBC, and what to look for when a notes app claims AES-256 encryption.
GuíasWhat Is Local-First Software? Definition, 7 Properties & Real Examples (2026)
Local-first software keeps your data on your device — not on someone else's server. Definition, the 7 properties from Ink & Switch, real examples, and which popular apps (Notion, Figma) are NOT local-first.
NovedadesFilarr goes open source — why BSL 1.1
Filarr's desktop client is now published on GitHub under Business Source License 1.1. What this means, what stays closed, and why I chose this license.
GuíasFilarr security, layer by layer — the exhaustive defensive architecture
Threat model, cryptography, Electron hardening, comparisons with Signal / 1Password / Obsidian, real-world CVE walk-throughs. The complete guide to everything protecting your data — including from the servers hosting it.
NovedadesWhy I built Filarr
I wanted one app for my files, my notes, and my knowledge graph — encrypted by default, no cloud, no account. Nothing existed, so I built it.
NovedadesIntroducing Filarr — an encrypted, local-first workspace
Notes, files, graph view, canvas — all encrypted with AES-256-GCM, all on your machine. No cloud required. No account needed. Free.