What Readwise already does well
Readwise splits its offering into Reader and Highlights, with Full Readwise at $9.99 per month billed yearly and Reader-only or Highlights-only at $7.99 per month billed yearly (official pricing). Ghostreader supports automatic summaries and tagging, and Global Ghostreader answers questions across the library with citations on web and desktop (Ghostreader FAQ, Global Ghostreader).
Reader documents RSS and newsletter support, full-text search across library documents, and exports including CSV, OPML, full-content ZIP, annotations and Send to Kindle (search, exports). An official MCP combines semantic and full-text search (MCP documentation). That is a high bar, so treat alternatives as different trade-offs. For a side-by-side view, read KnowMan vs Readwise.
KnowMan: cited answers, Memories and agent access
KnowMan answers questions from your saved reading with citations you can open and check. Free includes unlimited saving, full-text search, highlights and annotations without limits and five Ask questions a day; Pro removes the daily limit and adds semantic search, feeds, newsletters, ingestion rules and AI summaries.
Its distinguishing feature is Memories: what you decided and why, kept beside the reading behind the decision. The MCP server exposes six tools, kb_search, kb_get_item, kb_ask, kb_memories, kb_recent and kb_save, to Claude Desktop, Claude Code, Codex, Cursor and any MCP client, and agents can read Memories but cannot write them. Pro is $12.99 per month or $99 per year, exports to Obsidian, Logseq and EPUB, and every account starts with 14 days of Pro without a credit card.
The honest trade against Readwise is breadth. Reader documents a mature highlight pipeline, Kindle sends and annotation exports (exports), while KnowMan concentrates on answers with citations, recorded decisions and agent access. If your week revolves around studying highlights, Reader remains the stronger fit; if it revolves around questions that need evidence, test both with the same sources.
Raindrop: visual collections at a lower entry price
Raindrop organizes saves with collections, tags and multiple layouts, includes a clean reader, and offers Stella for meaning-based retrieval (official overview, Stella). Unlimited highlights are on the Free plan; full-text search requires Pro (plan details).
An official hosted MCP server is documented as well (MCP documentation). If your goal is an organized visual library more than long-form study, Raindrop covers it for less.
Instapaper: simple reading, lowest paid price
Instapaper Premium costs $5.99 per month or $59.99 per year and includes full-text search, unlimited highlighting and narration voices; free highlighting is limited (Premium). Folders, tags, summaries and browser extensions for Chrome, Firefox and Safari round out the reading experience (extensions).
Its official Obsidian plugin syncs highlights and notes (connected accounts). There is no documented library-wide AI chat, so choose it for reading rather than research.
Omnivore: own the software, run the server
Omnivore's hosted service was deprecated in November 2024 and the project continues as self-hosted software with publicly available code (official README). It documents full-text search with advanced filters, a rules engine with automatic labeling, newsletter email ingestion and native RSS subscriptions (search, rules).
This route trades subscription fees for maintenance. If you enjoy running services, it is a genuine Readwise alternative; if not, the hosted options above fit better.
How to choose between them
Start from the question you ask most often. If it is where did I read that, full-text search on a free plan may settle it. If it is what did these sources conclude, and why did I choose this approach, cited answers and decision Memories point to KnowMan.
Then test with real material: import or save ten representative articles, run one genuine question through each candidate, and compare the answers and their evidence side by side.
- Visual collections at a lower entry price: Raindrop.
- Simple, affordable reading: Instapaper.
- Study highlights, summaries and Kindle sends: Readwise Reader.
- Cited answers, decision Memories and agent access: KnowMan.
- Control and no subscription, with maintenance: self-hosted Omnivore.
Questions people ask
Is there a free Readwise Reader alternative?
KnowMan's Free plan includes unlimited saving, full-text search, highlights and annotations without limits and five Ask questions a day. Raindrop's Free plan includes unlimited highlights, though full-text search requires Pro there (plan details).
Which alternative answers questions across my library?
Readwise's Global Ghostreader does this with citations, and KnowMan does the same from saved reading with citations you can open (Global Ghostreader). Instapaper and Omnivore do not document a library-wide AI chat.