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PaperLine
Invoice data you can trust, backed by an audit trail
PaperLine is an expense tracker built around trust in the numbers. Raw invoice data is never overwritten by currency conversion, and every change is logged with who made it, so nothing gets silently altered without a trace. It extracts text directly from each invoice first, and only sends it to a vision model when that extraction isn't enough, keeping it cheaper and faster than tools that run every document through a vision model. Built with Expo/React Native, FastAPI, and Supabase.
PaperLine started from a technical problem I found interesting rather than a personal expense-tracking headache: a lot of expense tools convert invoice currency and overwrite the original number in the process, so there's no way back to what was actually printed on the invoice, or who touched it.
So PaperLine keeps raw and converted values separate, and logs every change along with who made it, so there's always a clear record of what happened to a number, when, and by whom.
Under the hood it extracts text directly from each invoice first, and only falls back to a vision model when that isn't enough. Most tools just run everything through vision, which is slower and more expensive.
Built with Expo/React Native, FastAPI, and Supabase. I'd genuinely love feedback from anyone who actually handles invoices day to day, especially on whether this solves a real problem or if I'm missing something obvious.
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About PaperLine on Product Hunt
“Invoice data you can trust, backed by an audit trail”
PaperLine was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #155 on the daily leaderboard. PaperLine is an expense tracker built around trust in the numbers. Raw invoice data is never overwritten by currency conversion, and every change is logged with who made it, so nothing gets silently altered without a trace. It extracts text directly from each invoice first, and only sends it to a vision model when that extraction isn't enough, keeping it cheaper and faster than tools that run every document through a vision model. Built with Expo/React Native, FastAPI, and Supabase.
PaperLine was featured in Productivity (661.2k followers), Fintech (47.5k followers), SaaS (44.3k followers) and GitHub (41.4k followers) on Product Hunt. Together, these topics include over 268.3k products, making this a competitive space to launch in.
Who hunted PaperLine?
PaperLine was hunted by Brian Paul Saulan. 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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Brian Paul Saulan