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Spantail
The open-source work log for human + AI teams
Record human and AI work with almost no overhead, then turn one unified timeline into any report. Open source, MIT-licensed, self-hosted on Cloudflare.
Hi Product Hunt 👋 I'm Masakuni, and I run AIRS, a small software shop in Tsukiji, Tokyo. We've built web, mobile and AI projects on contract since 2003 — a small team that reads its own code.
We made Spantail for ourselves first. We'd always kept a work log to scope estimates and look back on a sprint. But once coding agents started doing a real share of the work, none of that effort showed up anymore — every tool we had assumed a person typed in each hour.
So we fixed it. A rough version took three days; two weeks later the whole team was using it daily. It records what people and their agents do on one timeline, then turns it into any report. It's open source (MIT) and self-hosted on your own Cloudflare account — one Worker, one D1 database — because a work log is the most honest record of what a team did, and that belongs on infrastructure you control.
This is our first launch here, and we're a little nervous 🙇 Happy to answer anything about how we built it or how we use it. Thanks for taking a look.
About Spantail on Product Hunt
“The open-source work log for human + AI teams”
Spantail was submitted on Product Hunt and earned 12 upvotes and 6 comments, placing #62 on the daily leaderboard. Record human and AI work with almost no overhead, then turn one unified timeline into any report. Open source, MIT-licensed, self-hosted on Cloudflare.
On the analytics side, Spantail competes within Time Tracking, Developer Tools, Artificial Intelligence and GitHub — topics that collectively have 1M followers on Product Hunt. The dashboard above tracks how Spantail performed against the three products that launched closest to it on the same day.
Who hunted Spantail?
Spantail was hunted by Masakuni Kato. 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.
For a complete overview of Spantail including community comment highlights and product details, visit the product overview.
Masakuni Kato