Tools we love

Our top pick for users who don't want to manage API keys. One flat-rate subscription gives you unlimited access to GPT-5, Claude, Gemini, Grok, Midjourney, ElevenLabs and more — all in one chat-style interface. Cheaper than ChatGPT Plus + Claude Pro + Gemini Advanced combined. Used by 1M+ creators monthly.

The cleanest legal way to get your Kindle highlights into Marvex Studio. Readwise syncs with every reading app, then exports PDF / Markdown you can drop into Intake. Paid, but the 30-day trial is generous.

Highlight any webpage, tag passages, then export as JSON. Especially lovely for papers hosted on arXiv / bioRxiv / your own PDFs. Zero cost, privacy-friendly, academic-grade.

Track every paper, book, and web source with one click. Marvex Studio already talks to Zotero directly — paste your API key in the Intake Studio to pipe any PDF straight into the Fixer.

Curated public-domain classics, professionally typeset. Better than raw Gutenberg text — and every download is a legit PDF ready to map. No sign-up.

Cornell's decades-old open-access server. Marvex Studio's Public Domain tab already searches and fetches PDFs directly — but the full browse experience on arxiv.org is worth knowing.

NIH's canonical index — 35M+ papers. Open-access hits link straight to PMC PDFs that drop into Intake cleanly.

The granddaddy. Marvex Studio already converts Gutenberg plaintext into a mappable PDF via the Public Domain tab — but a slow browse is how you find the gems.

Export your mind-map to Markdown (Pro feature, coming soon) and let Obsidian's graph view reveal connections across maps you built weeks ago. Free for personal use; Publish and Sync are optional paid add-ons.

Turn your deepest map elements into flashcards that stick for a decade. Import JSON; export CSV. Free on desktop, open source.

If Obsidian feels too minimal, Roam's bidirectional-linking interface may click. Paid, but beloved by a dedicated crowd.