Finally, an inbox you'll look forward to. Agents sort your messages, draft your replies, and clear the grunt work behind the scenes, all in a client so well-crafted that email feels light, fast, fun.
Hey Product Hunt! 👋 Louis here, co-founder of Upstream.
When I was at Algolia, I was drowning in 200 emails a day. I was never sure where to focus, and getting through my inbox took forever. I knew it didn’t have to be this way. Instead of creating a new messaging protocol, I bet on rethinking the tool everyone uses: email.
We built the first email client where agents do real work alongside people. We designed Upstream to be easy to pick up and fun to use.
📥 Take the noise out of email Agents automatically triage your inbox, separate signal from noise, and surface only what deserves your attention
✍️ Every reply starts with a draft Upstream drafts replies for every conversation that needs one. It also changes your voice based on who you’re talking to and the context of the convo
⏰ Never miss a follow-up Agents track open loops and remind you when needed, making sure important conversations don't fall through the cracks
🔎 Ask anything about your work AI can instantly find information across your inbox and connected tools: receipts, meeting notes, introductions, decisions, conversations, and more
🔗 Bring all your context into your inbox Agents use information from tools like Notion, Calendar, Drive, Granola, and other sources to produce better answers and drafts
👉 As a special thank you to the Product Hunt community, you get one free month of Upstream Pro if you sign up at upstream.do and use the code PH26! 👈
We are all so excited to hear what you think! Please do reply here and let me know
Huge thanks to our hunter @garrytan for hunting us 🙏
I've been playing around with several AI email apps and this one is by far the most sophisticated in drafting emails. Great product. Hats off to Louis Lecat and team.
Love the vision behind Upstream! The inbox triage and automatic follow-up features could save users hours every week. Congrats on the launch and best of luck!
Congratulations! Upstream looks really promising. I know you support multiple accounts, but would I have to pay multiple times as well? I have 5 accounts, and no matter how good your service is, I can't pay $100 / month for an email client. :) Also, I have a couple of different aliases under one email. Do you support email alias under one account as well?
well-crafted enough that email feels light, fast, fun is a strong claim for a category where almost every alternative feels like a chore by design. curious what specifically makes it feel that way day to day, is it mostly the agent doing less for you to look at, or is there an actual interaction/interface difference, animations, speed, layout, that contributes independently of the AI features. those are separable and it'd be useful to know which one is doing the heavy lifting
The human + agent inbox positioning is interesting. Email has a lot of hidden context, so I like that you are not framing this as just another summarizer. How do you decide which actions should stay manual versus agent-assisted?
The UI looks absolutely beautiful and lightweight. Since it's built to clear out backend grunt work, does Upstream integrate directly with standard business tools like CRMs or project management platforms to log customer conversations automatically, or is it strictly focused on the email client layer?
Oh man - a potentially valid contender to go up against my precious Shortwave email client?! Installing now! 👀
the "agents do the grunt work" angle is interesting because most AI email tools still make you manage the AI. curious how the triage actually works in practice, does the agent learn your priorities over time or is it more rule-based out of the box?
HI @louislecat my question is, most tools that connect to slack and notion hit token limits or lag heavily when syncing large workspaces. how often does upstream index the connected apps for fresh context? such a great launch
I really enjoyed the UX for AI reply and integration with Granola. Congratulations on the launch
Great idea! How do you keep the agent activity from burying the messages I actually need to read myself?
@louislecat Congrats on the launch! The agent alongside you model is the right call, the inbox tools that have tried to fully automate away from the user have always hit a trust wall. The real design challenge is making the handoff between human and agent feel invisible. Curious how you're thinking about the moments where users want to override the agent without breaking the flow, that's where these products usually get complicated. Adding to my stack to test.
Great product!
I've been using it for a few weeks and I find myself in my inbox more than usual! Great auto-complete and I've been using the label features a lot!
Late to the thread but loving what I'm reading — especially Jonathan and Louis confirming nothing goes out without approval. That's the right instinct.
The follow-up I'd love your take on: how do you keep that approval step from becoming its own inbox grind? At high volume, approving every single draft can quietly recreate the exact load you're trying to remove. The teams I've watched do human-in-the-loop well tend to tier it — once the agent has earned trust, it auto-handles the truly low-stakes stuff ("got it, thanks") on its own, and reserves explicit approval for anything that actually commits you to something.
Curious whether Upstream leans that way, or keeps a hard approve-everything line on principle? Either way — congrats on #1. 👏
Upstream changed the way I looked at mails from something annoyingly and chaotic, to structured and organized @louislecat congrats on the launch, and great to see where you and the teamm took the product in the last month!
About Upstream on Product Hunt
“The inbox designed for humans and agents”
Upstream launched on Product Hunt on June 18th, 2026 and earned 653 upvotes and 243 comments, earning #1 Product of the Day. Finally, an inbox you'll look forward to. Agents sort your messages, draft your replies, and clear the grunt work behind the scenes, all in a client so well-crafted that email feels light, fast, fun.
Upstream was featured in Email (36.7k followers), Productivity (655.6k followers) and Artificial Intelligence (473.1k followers) on Product Hunt. Together, these topics include over 257.3k products, making this a competitive space to launch in.
Who hunted Upstream?
Upstream was hunted by Garry Tan. 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 Upstream stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Garry Tan
Hey Product Hunt! 👋 Louis here, co-founder of Upstream.
When I was at Algolia, I was drowning in 200 emails a day. I was never sure where to focus, and getting through my inbox took forever. I knew it didn’t have to be this way. Instead of creating a new messaging protocol, I bet on rethinking the tool everyone uses: email.
We built the first email client where agents do real work alongside people. We designed Upstream to be easy to pick up and fun to use.
📥 Take the noise out of email
Agents automatically triage your inbox, separate signal from noise, and surface only what deserves your attention
✍️ Every reply starts with a draft
Upstream drafts replies for every conversation that needs one. It also changes your voice based on who you’re talking to and the context of the convo
⏰ Never miss a follow-up
Agents track open loops and remind you when needed, making sure important conversations don't fall through the cracks
🔎 Ask anything about your work
AI can instantly find information across your inbox and connected tools: receipts, meeting notes, introductions, decisions, conversations, and more
🔗 Bring all your context into your inbox
Agents use information from tools like Notion, Calendar, Drive, Granola, and other sources to produce better answers and drafts
👉 As a special thank you to the Product Hunt community, you get one free month of Upstream Pro if you sign up at upstream.do and use the code PH26! 👈
We are all so excited to hear what you think! Please do reply here and let me know
Huge thanks to our hunter @garrytan for hunting us 🙏