Your library
Save, read, highlight, and search in the browser. Following keeps new suggestions separate from what you have saved.
Open your libraryA personal library for your research
Sponge
Save, read, and research with your sources
Save articles and PDFs in a private library. Read, highlight, and ask questions with references to the source. Follow the topics you care about, then turn useful material into notes and research.
Follow coral bleaching research. Find field studies with measurements. Save the ones you want to read.
Sign in with your Sponge account, or create a new one. Your library starts private. Saving an article does not publish it.
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Save articles and files for later. Open a saved copy to read, highlight a passage, or add a note.
Sponge interface · fictional notes and sources · Read the guide
- Save
- Keep articles and PDFs with a retained copy of the source.
- Read
- Highlight a passage, add your own note, and return to where you left off.
- Research
- Ask about a source, check the references, and develop your findings in a document.
Reading
Read the source, keep your own notes
The article, your notes, and generated answers each have their own place.
- A copy you can return to
- Read the saved text and download the retained source. Later copies keep their own date; existing highlights stay with the version you read.
- Your words beside the source
- Highlight across paragraphs and keep a note with the passage. Your notes remain separate from generated summaries and answers.
- Answers you can check
- Ask a question about the article or selected passages. Each answer links back to the saved text and identifies limits in what it could read.
How it works
From your reading to your research
Start with one article. Use the research tools when you need them.
Save a link or file
Add an article or PDF to your library. You do not need to create a document.
Read and make notes
Keep useful passages, add your thoughts, and mark an item as read when you’re finished.
Follow new material
Choose a feed, web page, or scientific topic. Describe what interests you and preview the matches.
Develop the research
Ask questions about your sources or write a document with an agent. You choose when to share your work.
Interfaces
Read, write, or use your own tools
Your library and documents are available in the browser and through the API.
Your research
Write with an agent, inspect sources and changes, and invite collaborators when you want to work together.
Open documentsYour own tools
Use the API or CLI to save sources, read your library, export originals and notes, and work with documents.
Explore the APIYour choices
You decide what to keep and share
An agent can help investigate and draft. Reviewing its work does not publish it.
- Private by default
- Your saved copies, highlights, and notes are private. Sharing a document does not share your source archive.
- You choose what gets saved
- Following suggests matches for you to review. Automatic saving is a separate choice for each rule; you preview its decisions before starting it.
- Generated work stays identifiable
- Overviews and answers link to their source passages. They do not become accepted findings or public research without review.
Questions
Before you begin.
What can I save?
Public web articles, PDFs, and supported text files. Sponge keeps the acquired file or page separately from the readable copy. If it could save only part of the text, the reader says so.
How does Following work?
Choose a website feed, one web page, or a scientific search. Describe the material you want and preview a few decisions. Matches appear as suggestions, or you can choose to save them automatically.
What does the agent add?
An optional short overview helps you orient yourself. Ask about the saved text or selected passages for a referenced answer. Open a document when you want to write or investigate further.
Will saving a long paper create hundreds of findings?
No. The first overview stays short and explains its coverage. You can select a section and ask for more detail. The saved source remains available independently of the overview.
Can I take my library with me?
Yes. Download a saved original from the reader. The API and CLI also export retained copies, highlights, and notes.
Is my library public?
No. Your library is private. You can share an authored document or publish a version of it without publishing your private source archive.
Do I need an account?
Yes. Sign in with your Sponge account, or create one, to save articles and keep your reading across devices.
Who makes Sponge?
Ben Guo, a musician and builder who was previously a founder and engineering leader at companies including Venmo and Stripe. He builds Sponge from Puerto Rico under Hraness.
Built by
Ben Guo
Sponge is built by Ben Guo, a musician and builder, formerly a founder and engineering leader at companies including Venmo and Stripe, now building from Puerto Rico. Sponge brings writing, source material, and agent research into one workspace.
Begin in private
Save something you want to read.
Add an article or PDF to your library. Read it now, or return when you have time.
Sign in with your Sponge account, or create a new one. Your library starts private. Saving an article does not publish it.
