ObsiKO: AI Markdown + Mindmap

Build your own knowledge universe — the easiest second brain, where every note becomes a shining star. ObsiKO — the AI Markdown + mind-map editor.

Tired of editors that mangle Korean typing? Want everything scattered around you gathered into plain Markdown (.md)? Everyday writing, LLM wikis, ontology, Zettelkasten, mind maps, reading logs, a codex, schedules — all of it, with no sign-in, payment, or subscription. (AI features require your own API key.)

■ Markdown that nails the basics · Rock-solid editing tuned for Korean — great as a plain writing app too. · Beginner cheat sheet, Mermaid diagrams, 20+ charts, easy task and frontmatter input, block IDs. · Inline drawing inside a note — turn a sketch into an AI image instantly. · Note Composer: merge or split notes from the editor's long-press menu.

■ A beautiful cosmic graph · Wikilinks, ontology, and PARA form constellations; a history mode replays how each star was born.

■ Dashboard and themes, styled your way · 40+ widgets plus query and embed boards: calendars, to-dos, habits, stats, games, AI briefing, tarot. · 20+ customizable themes, dynamic widgets that follow them, and your own fonts.

■ Korean-language tools · Spell check, dictionaries, and a companion panel: Writing Check, Socratic critique, genre editing, style polish. · Wikipedia, Namu Wiki, Urimalsam, SCP lookup; dictionary import (.ndjson).

■ Tasks and schedule · Easy tasks and reminders (Obsidian Tasks compatible, calendar subscriptions). · Calendars in notes, on the dashboard, in a panel, and on the Home Screen — year to day, plus timeline.

■ .base file support · Fully .base-compatible: projects, kanban, cards, charts, a Library with book search, PARA, a Ledger.

■ Infinite mind-map canvas (.canvas) · Full Apple Pencil drawing — turn drawings into AI images. · Build mind maps with AI or hand the AI one you drew; auto-generate from linked notes, auto-arrange, groups. · Double-click for a card, Enter for a sibling, Tab for a child. 5 styles, pin mode, presets.

■ Viewers, switched by one frontmatter line · Book view (two-page spread), Web novel view with typesetting presets, Messenger and Visual novel. · Screen-record the last two for instant Shorts; AI turns prose into those scripts. · Codex view: characters, backgrounds, custom categories, portraits auto-made into icons.

■ Images, built in · Background removal, rotate, flip, trim, convert, resize, filters, zoom — plus free image search on Pixabay, Pexels, Openverse.

■ Conversion and compatibility · Full Obsidian compatibility (.md, .canvas, .base) and vaults, Notion HTML import, one-click Markdown conversion for doc, PDF. · The Reference panel previews dozens of formats. Highlight text PDFs and Markdown, then insert, quote, or save it. · AI OCR for images and scanned PDFs, plus video and audio transcription. · A Marp property turns a note into slides (full-screen, laser pointer, auto-split). Export to PDF, DOCX, EPUB, HTML, ZIP.

■ A real web clipper · Grabs the article body and photos, not just the URL, with frontmatter and source filled in.

■ AI agent · Add your API key and go (Claude, Gemini, GPT), with TTS read-aloud and image generation in the editor. · It creates files, builds its own memory, sets up LLM wikis, designs ontology and Zettelkasten folders. · Prompt helper: scaffolds, one-click blocks, prompt checkup, AI polishing, rule files, slash commands.

■ Fast, powerful search · Filenames, full text, and meaning-based (semantic) search. Keep results in the sidebar or bookmark a query.

■ Little conveniences · Bookmark a note from the ribbon at the top right, mark where you stopped reading, hop around with back/forward. · Apple Watch quick memo, formatting toolbar, command palette, reading and focus modes, focus timer, word counts.

Amazingly, it's all free — skip the AI and there's no sign-in or payment at all. Built by one developer for daily use, so updates aren't going anywhere. Tell me about any rough edges.

■ Platforms · iPhone, iPad, Mac, and more. Korean, English, Japanese, with more to come. · The Mac desktop version unlocks the full AI agent (SDK and CLI).