Obsidian Review: Local-First Notes That Earn Their Privacy Reputation — AI Is Extra

Verdict (TL;DR): Obsidian is the best local-first note-taking app available, and for Australians who care about where their data lives, that matters. Your notes are Markdown files on your own device — not on someone else's server. AI is not built in and never has been; it comes via a rich ecosystem of community plugins. This is a productivity and knowledge management tool first. Its AI angle is real but entirely optional and requires setup. Worth it for knowledge workers who want to own their second brain.

Score: 17/25 — ⭐⭐⭐⭐ Very Good

Last reviewed: 26 June 2026 by Adam.

What Obsidian is

Obsidian is a local-first note-taking and knowledge management application made by Dynalist Inc., based in Vancouver, Canada. It launched in 2020 and has built a devoted following among knowledge workers, researchers, writers, and developers who want their notes to work the way their brain does — connected, searchable, and theirs.

The core product stores every note as a plain Markdown file on your device. Not in a cloud database. Not on a company server. On your hard drive. You can back them up, export them, open them in any text editor, and use them forever without needing Obsidian's servers to remain in business.

This is the defining feature. Virtually everything else — including AI — is built on top of it.

A clear-eyed note on AI: Obsidian ships with no native AI features. The Obsidian team has not built AI into the core application. Everything you will read about Obsidian + AI is about community plugins — third-party extensions built by independent developers and distributed through Obsidian's community marketplace. This is not a criticism; Obsidian's plugin ecosystem is one of the richest in its category. But a reviewer who leads with "Obsidian's AI" without this disclaimer is selling something.

What it costs in Australia

Obsidian's core application is free — no time limit, no credit card, no feature gating. Personal use is fully free.

Optional paid services:

Obsidian Sync is the paid sync service — end-to-end encrypted, version history, shared vaults. If you want your notes synced across devices through Obsidian's own service, this is the fee. You do not have to use Obsidian Sync; you can sync via iCloud, Dropbox, or any other file-sync tool at no cost.

Obsidian Publish turns your vault into a public website. Optional and separate from note-taking.

Commercial use is technically free — Obsidian does not require a commercial licence — but the company asks businesses to purchase one ($50 USD/user/year) to support independent development.

AI plugin costs are additional. The most popular AI plugins — Copilot for Obsidian (by Brevilabs), Smart Composer, Smart Connections — have their own pricing or require your own AI API key. Copilot for Obsidian's Plus tier runs $14.99 USD/month (~$25.58 AUD including GST). Most AI plugins that use BYOK have no additional plugin fee, but you pay your AI provider.

How it works in practice

Obsidian opens on a clean editor. You create notes in Markdown, link between them with [[double brackets]], and gradually build a knowledge graph where ideas connect across notes. The graph view visualises these connections as a network. Over time, patterns emerge — you notice which ideas you keep returning to, which topics link together, which notes are isolated.

Core non-AI workflow: Create a note, write, link to other notes, add tags, organise into folders if you prefer. That is the baseline. Many users find this alone worth the effort.

With Sync: Your vault syncs end-to-end encrypted across devices. Notes you write on your Mac appear on your iPhone and vice versa. The sync is fast and reliable on current versions.

With AI plugins: This is where it gets more involved. Installing a plugin like Copilot for Obsidian or Smart Composer takes a few minutes. Once configured with an API key (OpenAI, Anthropic, Google, or a local model), you get a chat interface that can reference your vault. Ask it to summarise a note, find connections between notes, draft a response based on your existing research, or explain a concept in context of what you've already written.

Smart Composer (open source, free, BYOK) is the current community favourite for AI-assisted writing within your vault. It supports local models via Ollama, meaning AI processing can happen entirely on your device — no data leaves your machine.

What a typical power user does: Takes notes all week in plain Markdown files. Syncs across devices with Obsidian Sync. On projects, opens a Smart Composer chat pane to ask questions of their accumulated notes. Gets answers grounded in their own vault content, not generic internet knowledge.

What it does well

Your notes are genuinely yours. Markdown files on your device. Open them in Notepad, in VS Code, in any editor. Obsidian's business model does not require you to stay on Obsidian's platform to access your own writing. In a category littered with subscription lock-in, this matters.

The plugin ecosystem is extraordinary. Over 1,000 community plugins exist. AI plugins are a subset — Smart Composer, Copilot for Obsidian, Smart Connections, Text Generator, and more. Each handles AI slightly differently. You can choose the one that suits your workflow.

Local AI support is real. Several plugins support Ollama and other local model runners. If you configure a local model, AI processing runs on your own hardware. No data sent anywhere. This is the strongest available data privacy position for AI-assisted note-taking.

The free tier is genuinely complete. Personal users who sync via iCloud or Dropbox pay nothing, ever, for a full-featured professional note-taking environment.

Linking and knowledge graph are best-in-class. Bidirectional links, backlinks, graph view, block references — Obsidian's knowledge management architecture is richer and more flexible than Notion, Roam, or most dedicated PKM tools.

What it doesn't do well

AI requires meaningful setup. There is no "enable AI" button. You install a plugin, configure an API key, understand the plugin's interface, and then you have AI. For non-technical users, this involves multiple steps and occasional troubleshooting. This is not a criticism of Obsidian's design philosophy — it is a deliberate trade-off — but it means Obsidian is not the right AI writing tool for users who want zero friction.

No collaborative editing. Obsidian is a single-user environment. Shared vaults via Obsidian Sync allow multiple people to access the same vault, but real-time collaborative editing (like Notion or Google Docs) is not supported.

Mobile experience is functional but not polished. The iOS and Android apps exist and sync works. But the mobile experience is noticeably less refined than the desktop app. Complex plugin setups often work only on desktop.

AI plugin quality varies. Community plugins are maintained by independent developers on a volunteer basis. Some are excellent and actively maintained; others are abandoned. Before committing to a plugin, check its last update date on the community marketplace.

No built-in AI writing features. If you're comparing Obsidian to Notion AI or ClickUp Brain — tools where AI is a first-class feature in the core product — Obsidian requires more work to achieve similar results. The capability exists, but through plugins, not out of the box.

Australian fit

Obsidian's local-first model is its Australian fit story, and it is a compelling one.

• Data residency: Your notes live on your device. Full stop. If you do not use Obsidian Sync, your notes never touch any server anywhere. This is the strongest possible data residency position — your data is in Australia because your device is in Australia.
• Obsidian Sync data location: Obsidian's own servers. The sync data is end-to-end encrypted, meaning Obsidian themselves cannot read it. Server locations are not explicitly stated on the pricing or security page. (exact data centre locations for Obsidian Sync not confirmed from primary sources.)
• AI plugin data: When you use an AI plugin with a cloud provider (OpenAI, Anthropic, Google), your prompt content goes to those providers' US-based servers. If you use a local model via Ollama, no data leaves your device.
• Pricing: USD only, and Obsidian says so on the page — it prints “$4 USD” and “$8 USD” beside the figures rather than a bare $. No GST display. Sync on annual billing is US$4/month, about A$5.62 ex-GST — one of the cheapest sync options in any note app.
• Support: Community forum, Discord, official help documentation. No Australian support hours. The community is active and international.
• Australian English: Obsidian itself is a Markdown editor — it displays whatever you type. AI plugins write in whatever language the underlying model defaults to. If you use an Australian English system prompt in your AI plugin, you'll get Australian spelling. You configure this yourself.

For privacy-aware Australian professionals — lawyers, accountants, healthcare workers, researchers handling sensitive data — Obsidian's local-first architecture is a genuine differentiator. Notes that never leave your device cannot be subpoenaed from a US cloud provider, cannot be lost in a data breach at a SaaS company, and are not subject to the provider's future pricing decisions.

AU Fit score: 3/5. Local-first is a genuine and strong data residency advantage. Loses points for USD pricing, unclear Sync server locations, and AI plugins that route to offshore cloud providers unless you configure a local model.

Alternatives

Reflect is the slicker, more modern note app with built-in AI at a higher price point. If you want AI without setup friction and are comfortable with cloud storage, Reflect is worth comparing. Our review covers the AU fit in detail.

Tana is a powerful graph-based workspace with some AI features. More opinionated in structure than Obsidian, still early-stage, but impressive if you like highly structured thinking. Currently invite-only / limited access.

Notion AI has built-in AI that is easier to access than Obsidian's plugin setup. It is a cloud tool (US-based data), far less focused on privacy, but much smoother for team collaboration and has AUD pricing. Not local-first.

Capacities (reviewed in Drafts) is an emerging knowledge management app with growing AI features and a cleaner interface than Obsidian. Worth watching as an alternative for users who want something more approachable.

Bottom line

Obsidian earns its reputation as the gold standard for local-first note-taking. Your notes stay on your device, the plugin ecosystem is remarkable, and the free tier is genuinely complete for personal use.

The AI story is more nuanced: capable and flexible once you have it set up, but requiring meaningful configuration that not every user will find worth it. The tools that exist — Smart Composer, Copilot for Obsidian — are good. The best of them support local models, meaning AI processing can run entirely on your hardware.

For Australian knowledge workers who value data ownership, this is the most defensible choice in the note-taking category. The setup overhead is the price you pay for that ownership.

Score

Frequently asked questions

Does Obsidian have AI features built in?

No. Obsidian's core application ships without AI. AI capabilities come through community plugins such as Copilot for Obsidian, Smart Composer, and Smart Connections. These plugins require their own setup — typically an API key from an AI provider, or a local model like Ollama running on your device.

Is Obsidian good for Australian users concerned about data privacy?

Yes — Obsidian's local-first model is one of its biggest advantages for Australian users. Your notes are stored as Markdown files on your own device. If you choose not to use Obsidian Sync, your data never touches any external server. AI plugins that support local models (such as Ollama) can process AI requests entirely on your own hardware, keeping everything onshore.

Is Obsidian free to use in Australia?

Yes. The core Obsidian app is free for personal use with no time limit or feature restrictions. Optional paid services include Obsidian Sync (approx. A$5.62/month ex-GST on annual billing) and Obsidian Publish (approx. AUD $13.64/month). AI plugins have their own pricing structures separate from Obsidian itself.

Sources

• Obsidian pricing page: https://obsidian.md/pricing (accessed 26 June 2026) — Wayback 29 August 2026
• Obsidian security page: https://obsidian.md/security (accessed 26 June 2026) — Wayback 5 July 2026
• Copilot for Obsidian pricing: https://www.obsidiancopilot.com/en/pricing (accessed 26 June 2026) — Wayback 14 June 2026
• Obsidian community plugins marketplace: https://community.obsidian.md/plugins (accessed 26 June 2026) — Wayback 5 July 2026
• USD/AUD exchange rate: ~1.40 as of September 2026 per AID methodology. Figures are ex-GST: a GST-registered business that supplies its ABN is not charged GST on an imported digital service; other buyers add ~10%.

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