Question: I'm looking for a way to centralize and organize my highlights from different sources like Kindle and Instapaper, can you suggest a service?

If you want to consolidate and organize your highlights from different sources like Kindle and Instapaper, Readwise is a good choice. It syncs highlights from Kindle, Instapaper and iBooks so you can tag, annotate and search your highlights. It also works with other tools like Evernote, Notion and Roam, and offers a read-it-later app with powerful highlighting abilities. Readwise offers a free trial and two pricing tiers depending on your needs.

Another option is Glasp, which lets you highlight and annotate web pages, PDFs and Kindle notes. It also offers features like AI-generated content summaries, knowledge graph tracking and the ability to create and share quoteshots. Glasp also works with other note-taking apps and offers a free plan with unlimited public highlights and export.

If you prefer a more AI-infused approach, Reflect has native AI abilities like voice note transcription, article summarization and grammar checking. You can import web clips and Kindle highlights across devices and integrate with other tools like Zapier and Google. Reflect's networked note-taking and end-to-end encryption means it's a private and powerful option.

Last, Recall is an information management tool that uses AI to summarize and store information you gather from web sources, including YouTube videos and PDFs. It helps you remember with spaced repetition and works offline. Recall is available as browser extensions and mobile apps, so it's a good option for professionals and lifelong learners trying to keep track of their knowledge.