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Highlight Inbox Synthesizer
Synthesize your highlight backlog into one note, no server
People sync hundreds of highlights from Readwise, Snipd, or Kindle into Obsidian and never open the folder again. Highlight Inbox Synthesizer reads the whole folder and writes one synthesis note: a summary, key claims, and topics per source, plus the themes that recur across sources. Runs on your own AI key. No server, no account, no subscription. Free tier included, one-time Pro license, no monthly fees.
I kept seeing the same complaint in reading and PKM communities: people sync hundreds of highlights from Readwise, Snipd, or Kindle into their vault and then never open the folder again. The saved passages pile up into a graveyard, and the effort of collecting them never pays off.
So I built a plugin that reads the whole folder and writes one synthesis note: for each source a summary, the key claims, and a topic list, then the themes that show up across more than one source, with where sources agree and where they pull apart.
A few decisions that make it different from most paid AI plugins: no server, no account, no subscription. It runs entirely on your device with your own API key. The Pro license is one-time and verified offline, so there is no backend and nothing phoning home. To be honest about privacy, BYOK still sends your highlight text to whichever model provider you choose, so I do not claim your notes never leave your machine, only that there is no server or data collection on my side.
I have no coding background, so I built this entire plugin with Claude writing the TypeScript, designing the architecture, and walking me through every step.
If you have a highlight backlog like this, I would like to know how you deal with it now.
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About Highlight Inbox Synthesizer on Product Hunt
“Synthesize your highlight backlog into one note, no server”
Highlight Inbox Synthesizer was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #158 on the daily leaderboard. People sync hundreds of highlights from Readwise, Snipd, or Kindle into Obsidian and never open the folder again. Highlight Inbox Synthesizer reads the whole folder and writes one synthesis note: a summary, key claims, and topics per source, plus the themes that recur across sources. Runs on your own AI key. No server, no account, no subscription. Free tier included, one-time Pro license, no monthly fees.
Highlight Inbox Synthesizer was featured in Productivity (655.7k followers), Notes (8.3k followers), Artificial Intelligence (473.1k followers) and GitHub (41.3k followers) on Product Hunt. Together, these topics include over 278.2k products, making this a competitive space to launch in.
Who hunted Highlight Inbox Synthesizer?
Highlight Inbox Synthesizer was hunted by İbrahim Edhem Harbutlu. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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İbrahim Edhem Harbutlu