I need a note-taking app that uses plain text files and does not lock my data into a proprietary format.

If plain files and portability are your top priority, I’d look at these:

• Obsidian — stores notes as ordinary Markdown (.md) files in a folder you control, making them easy to back up, edit elsewhere, or migrate.Markdown Editor Online+1
• Zettlr — open-source and Markdown-based, with strong support for standard Markdown and local files.Zettlr
• Logseq — local Markdown files with an outliner/backlink-oriented workflow.Markdown Editor Online
• Joplin — open-source and Markdown underneath, but its normal storage is a database; it can import/export Markdown, so it’s somewhat less directly file-based.Joplin+1

My shortlist: Obsidian if you want a polished general-purpose app; Zettlr if open source matters; Logseq if you like outlining.

If you tell me your OS (Windows/Mac/Linux/iPhone/Android) and whether you want sync, I can narrow it down.

If your priority is “my notes are just files I own”, I’d focus on apps where the source of truth is a folder of .md files—not merely apps that export to Markdown.

Good options

• Obsidian — Probably the most polished choice. It stores notes as ordinary Markdown files in a folder you control, so you can open them with any text editor. It adds backlinks, search, graph view, plugins, etc.Obsidian+1
• Logseq — Also works directly with Markdown/Org files and is open source. It's particularly oriented around daily notes and outlining rather than conventional documents.Markdown Editor Online+1
• Zettlr — A strong choice if you want a more traditional Markdown editor, especially for research and academic writing. It works with standard Markdown and supports citations/Zotero and Pandoc.Zettlr+1
• Joplin — Worth considering if sync and encryption matter more than having the raw .md files themselves be the primary storage. Joplin uses Markdown internally and has extensive sync options, but its normal local storage is app-managed rather than simply a folder of independent Markdown files.Joplin+2

What I'd look for

If your requirement is specifically no lock-in, I'd choose Obsidian, Logseq, or Zettlr and keep the notes folder somewhere you control. You can back that folder up with Git, Syncthing, Dropbox, etc., independently of the note-taking app.

One subtlety: Markdown itself is portable, but apps can add proprietary-ish extensions. For maximum portability, stick mostly to standard Markdown rather than relying heavily on things like app-specific callouts, databases, or special link syntax. Zettlr explicitly emphasizes standard-compatible Markdown.Zettlr

If you tell me whether you're on Windows, Mac, Linux, iPhone/Android, or a mix, I can narrow this to 2–3 choices based on your workflow and how you want syncing to work.

If you want complete data ownership and a "files over apps" philosophy , you need a local-first note-taking app that reads and writes straight to a folder of plain text Markdown (.md ) files on your hard drive. With these tools, if the app ever disappears, your notes remain fully intact and readable in any standard text editor.

Here are the best options available depending on your exact workflow:

• Obsidian : Best overall for knowledge management and customization. It runs entirely on a local folder (a "vault") of plain text Markdown files. It features a massive plugin ecosystem, graph views, and bidirectional linking, while letting you sync your files using any service you like (iCloud, Dropbox, Syncthing, or Git). You can download it directly from the Obsidian Website.ariv.one+2
• Logseq : Best for outliner-style and journal-driven note-taking. It is a privacy-first, open-source platform that stores everything locally in plain text Markdown or Org-mode files. It centers heavily on daily logs, task management, and flashcards. You can check it out on the Logseq Website.anarlog.so+1
• Joplin : Best open-source alternative if you want structured folders and easy out-of-the-box syncing. While it has its own internal structure, it stores notes as plain text Markdown locally and supports free syncing via OneDrive, Dropbox, or WebDAV. Learn more at the Joplin App Website.anarlog.so+2
• Zettlr : Best for academics, researchers, and writers. It treats your local directories as workspaces, combining Markdown editing with deep Zettelkasten linking and reference manager integrations (like Zotero). Get it from the Zettlr Website.
• VS Code / VSCodium : The ultimate minimalist "no special app" route. If you just open a folder of .md files in Visual Studio Code with extensions like Markdown All in One and Foam , you get a powerful, completely open ecosystem with zero abstraction between you and your text files.

Do you need these notes to sync seamlessly to a mobile device (iOS/Android) , and do you prefer a traditional folder hierarchy or a networked/bidirectional linking style?

If your priority is “my notes are just files I own”, look for apps that store notes as plain text Markdown (.md) files in a normal folder. These are the strongest fits:Noteline+1

Best choices

Obsidian — best overall for most people

• Stores notes as ordinary Markdown files in a folder (“vault”) you control.
• Excellent linking ([[note links]]), search, plugins, and knowledge-base features.
• Your notes remain readable even without Obsidian.
• Tradeoff: the app itself is proprietary/closed-source, even though the files are yours.Parse+1

Best for: personal knowledge bases, research, “second brain” workflows.

Zettlr — best strict file-first option

• Built around Markdown files rather than a hidden database.
• Open source.
• Strong for long-form writing, research, citations, and exporting.Zettlr

Best for: writers, academics, people who care most about long-term portability.

Logseq — best open-source linked-notes option

• Designed around local Markdown/Org-mode files.
• Great for daily notes, outlines, backlinks, and networked thinking.
• Open source.Parse+1

Best for: journal-style note taking and structured thinking.

Plain Markdown folder + editor — maximum future-proofing

A very durable setup is:

• A folder of .md files
• Any editor you like (for example, a Markdown editor or code editor)
• Sync with a tool you control (Git, Syncthing, Dropbox, etc.)

This has the least dependence on any one app.Unstore

What I would avoid for your specific requirement

• Apps that export to Markdown but primarily store notes in their own database.
• Proprietary “workspace” formats where leaving requires a migration step.

For example, Joplin supports Markdown and is a good open-source notes app, but its normal architecture is more application-managed than a simple folder of Markdown files, so it may not satisfy a strict “my files first” requirement.Joplin+1

My recommendation

• Want the best experience: Obsidian
• Want open source + plain files: Zettlr or Logseq
• Want your notes to survive any app disappearing: plain Markdown folder + a simple editor

For most people who say “I never want vendor lock-in,” I’d start with Obsidian or Zettlr and keep the notes folder backed up independently.

Yes. If your priority is “my notes are ordinary files I can open with any text editor”, I’d narrow it to these:

• Obsidian — best overall. It stores notes as ordinary Markdown (.md) files in a folder you control, so you can edit them with VS Code, Notepad, or any other editor. It has excellent linking, search, backlinks, and plugins. The important caveat is that Obsidian itself is proprietary/closed-source, even though your data isn't.Obsidian+1
• Logseq — best if you want open source. Its current site explicitly emphasizes local ownership and Markdown files that can be opened in other tools. It's particularly good for daily notes, outlining, and bidirectional links.logseq+1
• Joplin — best for privacy and syncing. It's open source, supports Markdown, works offline, and offers end-to-end encrypted synchronization. One nuance: Joplin's application storage is more database-oriented, so it isn't as cleanly “a folder of .md files” as Obsidian. Its notes can nevertheless be imported/exported as Markdown.Joplin+2

My recommendation

If your exact requirement is:

“If this app disappears tomorrow, I want a folder of readable text files that I can simply take somewhere else.” I'd choose Obsidian.

If you additionally require the application itself to be open source, choose Logseq.

I'd also keep your notes in a normal folder that you back up independently (Git, Dropbox, iCloud, etc.) rather than making the app's sync service your only copy. This gives you a particularly strong hedge against vendor lock-in.Obsidian

If you tell me Windows/Mac/Linux + phone (iPhone/Android) + whether you want sync, I can narrow this to the best 1–2 choices for you.

Obsidian, Logseq, and MarkText are top note-taking applications that store your work directly as local plain text Markdown (.md ) files on your computer, meaning you retain 100% ownership of your data with zero proprietary lock-in.

Plain Text Note-Taking Options

Key Choices for Open Data

• Obsidian: Operates entirely on a local folder of plain text Markdown files. You can open, edit, or back up these files using any text editor (like VS Code, Notepad, or TextEdit) at any time. It requires no account to get started locally.bishwarup-paul.medium.com+2
• Logseq: An open-source, privacy-first knowledge base that stores thoughts as local plain text files. It structures notes with bullet points and daily journals, letting you keep total control over your raw data directory.
• MarkText: A simple, beautiful open-source writing app focused on clean, real-time preview Markdown editing without forcing your files into a database or proprietary container.
• Joplin: A fully open-source note manager that saves notes in standard formats. While it can use a sync client, your core notebook data remains accessible and exportable.youtube.com+1

Would you like to explore how to sync these local text files across multiple devices (like your phone and computer) using free tools like Git or Syncthing?

If your priority is “my notes are mine, stored as ordinary text files, and readable without this app forever”, look for apps that use Markdown (.md) files in a normal folder rather than a hidden database.Unstore

Here are the strongest choices:

Best overall: Obsidian

• Stores notes as individual Markdown files in a folder (“vault”) you control.
• Excellent search, backlinks, tags, plugins, and graph view.
• You can open the files with any text editor if you stop using Obsidian.
• Tradeoff: the app itself is proprietary/closed-source, even though your data format is open.ossium+1

Best open-source option: Logseq

• Built around local Markdown/plain-text notes.
• Great for daily journals, outlines, research notes, and linked thinking.
• Open source.
• Tradeoff: its block/outliner style feels different from a traditional notebook.Nimbalyst

Best for writing and research: Zettlr

• Uses Markdown files directly.
• Strong for long-form writing, academic work, citations, and exporting.
• Open source.
• Tradeoff: less of a general-purpose “second brain” than Obsidian.Zettlr

Best if you want a simple editor: iA Writer or Typora

• Focus on writing rather than building a knowledge system.
• Work well with Markdown files.
• Tradeoff: fewer knowledge-management features.

One I’d be cautious about for your exact requirement

Joplin is excellent software and supports Markdown, but its normal workflow is more application-managed; it is not as purely “a folder of files you own” as Obsidian, Logseq, or Zettlr.Joplin+1

My recommendation by use case

• Want the best all-around system: Obsidian
• Want open source + ownership: Logseq or Zettlr
• Want minimal lock-in above all else: Zettlr
• Want plain writing without a knowledge graph: iA Writer or Typora

A good test: create a few notes, close the app, and confirm you can find and read the .md files directly in your file manager. If you can, you have a much better exit path.Unstore

The best note-taking apps that use plain text and local files without proprietary lock-in are Obsidian, Joplin , and Logseq.xda-developers.com+1

Top Plain Text Note-Taking Apps

• Obsidian : Stores all your notes as local Markdown (.md ) files in a folder on your device. It offers robust linking features, a vast plugin ecosystem, and complete ownership of your data.xda-developers.com+1
• Joplin : An open-source app that keeps notes in plain text format and allows you to sync freely with local storage or external cloud services.
• Logseq : A privacy-first, local-first tool that organizes your notes using outline formats stored directly in plain text Markdown or Org-mode files.

Watch this overview of modern note-taking strategies and tool alternatives to see how local-first setups compare:

19:1915 Best Note-Taking Apps for 2025 (That Aren't Notion orYouTube · Shu Omi · ...87K views · 1 year ago

If you want to narrow down the choice, let me know:

• Do you need cloud sync across devices, or strictly offline/local storage?
• Do you prefer a traditional folder structure or an outliner format?