PrettyMD vs Obsidian
One is a second brain for everything you'll ever write. The other is a focused reader for what your AI agents write right now. If your daily problem is the second one, here's the honest comparison.
PrettyMD vs Obsidian at a glance
| PrettyMD | Obsidian | |
|---|---|---|
| Best for | Reading & reviewing .md files your AI agents write | Building a linked personal knowledge base over years |
| Price | $19 one-time · 7-day free trial · free for personal review use | Free personal · $50/user/yr commercial · Sync $4–5/mo extra |
| Unique strength | Line comments your AI agent reads & acts on | Backlinks, graph view, and a massive plugin ecosystem |
| Key limitation | Read-only viewer; no backlinks or graph features | No agent loop, no change highlighting, vault-first workflow |
| Setup to first useful read | Open a folder. Done. | Create a vault, learn the model, configure to taste |
| Platforms | Mac, Windows | Mac, Windows, Linux, iOS, Android |
The 60-second answer
If AI agents write documents you need to review, PrettyMD wins. It opens a folder of specs and plans with zero ceremony, highlights exactly what changed since you last read each file, and turns your feedback into line comments that Claude Code, Codex, opencode, or Cursor read directly — no copy-paste, no context loss, no plugin hunting. Obsidian can do none of those three things out of the box.
If you're building a long-lived personal knowledge base — notes that link to each other, a graph of ideas you cultivate for years — Obsidian is excellent and free for personal use. Its backlinks, graph view, and community plugins are genuinely unmatched. Different job, different tool.
Feature-by-feature: the details that matter
| Capability | PrettyMD | Obsidian |
|---|---|---|
| Line comments your AI agent reads | PMD Highlight → sidecar comment → compatible agent updates the Markdown | Not native (plugin territory) |
| Change tracking since last read | PMD Automatic per-file highlights | File mtimes only, no line-level diff view |
| Zero-setup reading | PMD Open a folder, start reading | Vault creation & configuration first |
| Built-in agent integrations | PMD Claude Code, Codex, opencode, Cursor | Community plugins only |
| Folder-wide tabbed reading | PMD .md-focused sidebar + tabs | Yes (file explorer + tabs) |
| Backlinks & graph view | OBS Not the focus | OBS Best-in-class linking |
| Plugin ecosystem | Focused, curated | OBS Thousands of community plugins |
| Mobile apps | No | OBS iOS + Android |
| Mermaid, code blocks, full spec, offline | Yes | Yes |
1The agent comment loop — feedback without leaving the page
Your agent produces a migration plan. You disagree with step 3. Highlight it, type why, done — Claude Code picks up the comment in context and revises. The conversation lives inside the document, where the work lives.
You'd copy the section into your terminal or chat window, explain which note and which part, and manage the exchange by hand. Community plugins add annotation layers, but nothing speaks to coding agents natively.
2Change tracking — attention where it's needed
Agents revise constantly. PrettyMD highlights every line that changed since your last read, so a revised 500-line spec costs you 40 lines of attention instead of a full re-read.
Modified timestamps tell you *something* changed. Finding *what* means opening a diff tool manually or re-reading the file.
3Time-to-first-page — zero ceremony
Point it at a folder. Every .md file renders instantly — Mermaid diagrams, code blocks, tables. No vault decision, no onboarding checklist, nothing to configure before the first useful read.
Obsidian's power comes from its model: vaults, links, properties, plugins. That model asks for setup decisions before it pays off — which is the right trade for a knowledge base, and pure overhead when you just want to read today's generated plan.
4Where Obsidian genuinely wins
Credit where it's due:
The knowledge-base model. Backlinks, graph view, daily notes, and a decade-scale archive of connected thinking — Obsidian is the category leader for a reason, and free for personal use.
The plugin ecosystem. Thousands of community plugins cover nearly any workflow. If you love tinkering, that's a superpower.
Mobile and Linux. iOS and Android apps plus Linux support — PrettyMD is desktop Mac/Windows only today.
Which should you choose?
Choose PrettyMD if…
- Claude Code, Codex, or Cursor writes docs you must review
- You want feedback delivered as line comments the agent actually reads
- Revised files should show you what changed, not make you hunt
- You want to open a folder and start reading — no setup ritual
Choose Obsidian if…
- You're building a years-long personal knowledge base
- Backlinks, graph view, and interlinked notes are central to how you think
- You want thousands of plugins and deep customization
- You need mobile apps or Linux
They coexist fine: plenty of people keep their life in Obsidian and review agent output in PrettyMD. But for the AI-coding review loop specifically, PrettyMD does jobs Obsidian was never designed to do.
Frequently asked questions
Is PrettyMD a good Obsidian alternative?
For reading and reviewing Markdown that AI coding agents write, yes — no vault setup, automatic change highlights, and line comments that agents read and act on. For building a linked personal knowledge base, Obsidian remains the stronger choice.
Is Obsidian free?
Free for personal use. Commercial use needs a $50/user/year license (checked August 2026). Sync ($4–5/mo) and Publish ($8–10/mo) are paid add-ons.
Can Obsidian leave comments for AI coding agents?
Not natively. Plugins add annotation layers, but no built-in loop exists where an agent reads your inline comments and makes the change. PrettyMD ships that as its core feature.
Does Obsidian show what changed in a file since I last read it?
No — it shows modification times, not line-level change highlights between your reads. PrettyMD does that automatically for every file in the folder.
Fact-checked August 2026 against obsidian.md/pricing and obsidian.md/license (pricing, platforms, licensing terms) and prettymd.app (features). Obsidian is a trademark of its respective owner; this comparison is independent and not endorsed by Obsidian.