Small browser tools that do one job and keep your data on your computer.
Privacy first. No accounts, no analytics, no tracking. Your notes, chats and captures stay in your browser.
One-time prices. Try each tool free, then pay once if it’s useful. No subscriptions.
Chrome and Firefox. ProofStamp and MomentNotes work in both browsers. ChatCellar is for Chrome. TableSnag and WholePage PDF are for Firefox.
Drag over part of a page and save it as a PDF stamped with the page title, the page URL and the capture time in local time and UTC. Prefer an image? Save it as PNG. Useful for bug reports, support tickets and keeping a record of what a page showed.
Free: your first 3 captures, with every feature. Trial PDFs carry a “free trial” footer line.
Price: $7.99 one-time for unlimited captures.
Install: Chrome Web Store · Firefox Add-ons Buy a license: Gumroad · Privacy policy
Take notes on a YouTube video without losing your place. Each note is stamped with the video time. Click it later and the video jumps back to that moment. Export your notes as Markdown for Obsidian, Notion or any Markdown editor.
Free forever: unlimited notes and Copy Markdown. Downloading .md files is free for your first 3 videos.
Price: $2.99 one-time for unlimited .md downloads.
Install: Chrome Web Store · Firefox Add-ons Buy a license: Gumroad · Privacy policy
Save your ChatGPT and Claude conversations into a private archive in your browser. Search and reread them offline. Back them up whenever you like.
Free: up to 25 saved chats, with search, the library, optional auto-save and restore from a backup.
Price: $19 one-time for unlimited chats, plus Markdown, JSON and .zip export and full backups.
Install: the Chrome Web Store listing isn’t live yet. The link will be added here once it’s published. Buy a license: Gumroad · Privacy policy
Click any table or list on a web page and copy it into Google Sheets or Excel, or save it as CSV or Excel. Handles merged cells, lists of cards and tables split over several pages.
Free: every feature, up to 250 rows per table.
Price: $15 one-time for no row limit.
Install: the Firefox Add-ons listing is waiting for Mozilla’s review. The link will be added here once it’s published. Buy a license: Gumroad · Privacy policy
Save a whole web page as a PDF that looks like the screen, with real text you can search and copy. An optional stamp adds the page title, address and time. It’s off by default.
Free: up to 10 PDF pages per capture, with a small credit line.
Price: $9 one-time for up to 150 pages per capture, and the credit line can be turned off.
Install: the Firefox Add-ons listing is waiting for Mozilla’s review. The link will be added here once it’s published. Buy a license: Gumroad · Privacy policy
Questions or problems? See Support or email onceworks.tools@gmail.com.
MomentNotes is not affiliated with YouTube or Google. ChatCellar is not affiliated with OpenAI or Anthropic.