SpawnGraph vs Heptabase
Heptabase is a paid PKM tool (around $9/month) built around hand-written cards spatially arranged on infinite whiteboards — powerful for long-term knowledge gardening, but slow to start from a fresh document. SpawnGraph is a free, browser-based mind mapping tool that turns a PDF, a URL, a YouTube link, or any of 90+ file formats into an editable hierarchical map automatically — no signup, no card-by-card writing, no paid tier required for real-time collaboration.
| Feature | SpawnGraph | Heptabase |
|---|---|---|
| Free tier (no time limit) | Yes | No |
| Browser-native (no install) | Yes | No |
| Automatic mind map from a document | Yes | No |
| PDF to mind map | Yes (93+ formats) | Manual card extraction |
| URL / YouTube import | Yes | No |
| Real-time collaboration | Free on every plan | Paid Collaboration plan |
| Native desktop apps (macOS/Windows/Linux) | Coming soon (Tauri) | Yes |
| Mobile apps (iOS / Android) | Web/PWA | Yes |
| Card-based PKM with journals | No | Yes |
| Whiteboard with spatial card layout | Hierarchical canvas | Free-form spatial |
| Markdown import | Yes | Yes |
| No data sent to server (client-side NLP) | Yes | Cloud-synced |
| Starting price | $0 forever | ~$9/mo |
Card-based PKM vs automatic mind mapping — different jobs
Heptabase's core unit is the card: a small markdown note you write yourself, then drag onto a whiteboard, link to other cards, group into sections, and revisit over weeks or months. The whole product is built on the premise that knowledge work is slow accretion — you write atomic notes, you sit with them, you rearrange them, and the structure of your understanding emerges from the layout you create by hand. It is genuinely good at that. SpawnGraph approaches a different moment: you already have a source — a research paper, a textbook chapter, a Loom recording, a long blog post, a meeting transcript — and you need to see its structure now, not after an hour of card-writing. SpawnGraph reads the source, extracts headings and key concepts client-side, and produces a hierarchical map you can edit immediately. The two tools are not in conflict; they answer different questions about the same underlying activity of making sense of information.
The price gap is real for individuals
Heptabase has no free tier — only a 7-day trial — and the monthly subscription sits around $9, with the Collaboration upgrade adding cost on top. For a researcher or student evaluating the workflow, the trial is enough to get a feel for the product, but it is not enough to build the habit that makes a PKM tool worthwhile. SpawnGraph is free forever for individual use, including real-time collaboration with up to five editors per board, watermark-free PNG export, and 90+ import formats. The paid Solo Pro tier ($5/month annual) unlocks PDF, SVG, PPTX, XMind and other exports plus removes the PNG watermark, but it is genuinely optional — the free tier is the product, not a teaser. For users who are price-sensitive or want to try the workflow without committing, that gap matters.
Where Heptabase wins
If your job is long-term knowledge management — daily journals, atomic notes accumulating into a personal knowledge graph over months and years, deep work on a thesis or book — Heptabase is purpose-built for that. The card metaphor, the whiteboard spatial memory, the journal-and-tag system, and the native desktop and mobile clients with offline sync all combine into a coherent PKM environment that SpawnGraph deliberately does not try to replicate. Heptabase's spatial arrangement also encodes meaning that a strict hierarchy cannot: cards placed near each other suggest association, clusters suggest themes, distance suggests independence. For users who think spatially and want their layout to reflect that, the free-form whiteboard is the right tool. SpawnGraph's canvas is hierarchical and auto-laid-out — clearer for one document, less expressive for a vault of hundreds.
Where SpawnGraph wins
SpawnGraph wins on speed-to-first-map, breadth of source import, privacy, and price. Drop a PDF — even a 200-page research paper — and you get a usable structure in under two seconds. Paste a YouTube URL and get a map of the transcript, complete with timestamps. Paste a webpage URL and get a map of the article. All of that runs in the browser using client-side natural language processing — nothing about your content is sent to a server, which you can verify in DevTools → Network at any time. Heptabase syncs cards through its own cloud, which is necessary for its multi-device PKM model but means your content lives on someone else's servers. If you specifically need a tool that ingests external sources and synthesises them instantly, without subscription or sign-up friction, SpawnGraph is the better fit. If your workflow is card-by-card thinking over weeks, it is not.
Using both together
The two products complement each other cleanly. Use SpawnGraph as the "first pass" tool — drop in the paper, the lecture transcript, or the long article, get a hierarchical map of what it contains, edit out the noise. Export that map as Markdown (free) or as a portable knowledge zip (Solo Pro). Import the Markdown export into Heptabase to seed your card vault with structure rather than starting from blank cards. The handoff turns SpawnGraph into your synthesis engine and Heptabase into your long-term home. A surprising number of researchers use this combination because each tool is excellent at the part of the workflow the other is weakest at.