This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
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.
Update: We just added an interactive demo to this page — a 90-second click-through of Alice's day in Spantail 👆
You'll see her AI agent logging its own sessions, turning agent sessions into a work entry, building a daily report (human + agent work in one), and the team reviewing it with reactions and comments.
No sign-up needed — would love to hear what you think!
Self-hosting on Cloudflare is a nice touch, super easy to get running. The unified timeline idea actually makes sense after playing with it for a few minutes instead of just reading about it.
running it locally on cloudflare was painless and i liked how the timeline merges my keystrokes and the agent's edits without me tagging anything. really small thing but the self host setup just worked
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.
Spantail was featured in Time Tracking (11.8k followers), Developer Tools (515.9k followers), Artificial Intelligence (473.7k followers) and GitHub (41.3k followers) on Product Hunt. Together, these topics include over 211k products, making this a competitive space to launch in.
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.
Want to see how Spantail stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Masakuni Kato