Heptabase vs Obsidian: Whiteboard or plugin vault (2026)

A Heptabase whiteboard is a place, and where a card sits on it means something. Drop the fragments of twenty papers onto a board and the arrangement becomes an argument you can look at from a distance. One card can appear on several whiteboards at once, so a single idea takes part in several arguments without being duplicated, and the same cards render as mind maps, kanban boards, or tables when a different shape helps.

Obsidian has no spatial layer. It has wikilinks, backlinks, tags, and a force-directed graph that draws itself from your links rather than from your hands. That graph tells you what connects to what. It will not tell you that six particular notes belong together in the top-left corner because they are the counter-argument. For work on a question you have not resolved yet, the gap is real and markdown does not close it.

Heptabase keeps cards and whiteboards in its own format in the cloud, works offline against a local copy, and exports markdown when you ask. The text comes out. The layout does not, because markdown has no syntax for where one card sat relative to another. Whatever you spent Sunday arranging is precisely the part the export cannot carry.

An Obsidian vault has no export step. One note is one .md file in a directory you named, and Obsidian converts nothing when it opens the folder and nothing when it quits. Uninstall it and the folder is untouched. People tolerate Obsidian's rough edges because of that property, and it has nothing to do with any feature on its list.

Heptabase highlights PDFs and turns those excerpts into cards you can then arrange, and its higher tiers include AI research features. Students and researchers are the audience it has found, and reading a paper, pulling quotes, then laying them out is one continuous motion inside the app rather than three tools in a row.

Obsidian ships neither PDF highlighting nor AI in the core app. Both arrive through community plugins, with the quality variance and upkeep its own weakness list documents. A plugin can stop being maintained by whoever wrote it; a core feature cannot. If your reading is mostly annotated papers, Heptabase does that job in one piece where Obsidian assembles it from parts.

Obsidian's answer to almost any absent feature is its plugin catalogue, and drawing plugins such as Excalidraw do put a canvas inside a vault. Be precise about what that buys. A drawing becomes a file in the vault. Heptabase's cards are the notes themselves, shown in a place, and the arrangement is the working surface rather than an illustration stored beside the notes.

So plugins narrow the gap and leave the underlying model where it was. Obsidian's documented costs come along too: plugin quality varies, mobile compatibility is a recurring problem, and startup on a large vault carrying many plugins is slow enough that its own forum has threads about it. Heptabase has no plugin ecosystem to maintain and no plugin ecosystem to draw from.

Heptabase is subscription-only with a 7-day trial and no permanent free tier. Pro is $8.99 a month billed annually, Premium is $17.99, and Premium+ is $53.99 where the AI credits sit. Cloud sync is included, because the cloud is the product. Annual Pro works out near $108 a year.

Obsidian costs nothing, and has covered commercial use as well since February 2025, with a $50 per user per year licence available if you want to pay anyway. Sync costs $4-5 a month if you want the official service and Publish $8-10, both optional. The free sync routes are iCloud, Syncthing, or the community git plugin, which carries documented index.lock errors, line-ending conflicts, and unstable merge handling on mobile. The cheapest configuration of Obsidian is genuinely free and slightly manual.

Heptabase is $8.99 a month on annual Pro, $17.99 on Premium, and $53.99 on Premium+, after a 7-day trial and with no permanent free tier, so three years of Pro is roughly $324. Obsidian is free for personal and commercial use, which leaves Sync at $4-5 a month as the only line item it can generate, or nothing at all if you sync through iCloud or Syncthing. Valutorio is a paid Mac App Store app, with Valutorio Sync as an optional subscription of its own, so it is not the cheap option here either. Heptabase's subscription pays for whiteboard infrastructure and AI credits, which is real work; whether the arrangement of cards is worth $108 a year is a question only your own research habits answer.