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.






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Great product! I tested it and I'm pleasantly surprised by its effectiveness! It manages my emails very well, with highly relevant suggested replies that save me time—just reread and send! I haven't tested the collaborative aspect with my team yet, but the promise is there: working together on emails to provide the best possible responses, all while staying aligned with everyone, and all powered by AI. I highly recommend it!
@johan_p_ Thanks a ton Johan! We really appreciate it. Let us know if there are any features that would make things easier.
@johan_p_ we love that you’re finding so much value already!
@johan_p_ thank you - great to hear the replies feel relevant
@johan_p_ So glad it's saving you time, Johan - thank you! 🙏
@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.
@andrea_gill Thanks Andrea! You always have the final say. Agents tee everything up for you and the sending is left to you.
What agent tasks would you want to be able to override?
@louislecat Love that framing! agents tee it up, humans close it. The override moments I'd want most: tone adjustments when the agent reads the relationship wrong, stopping a send when context has changed since the draft was created, and flagging when an agent is about to deprioritize something that actually needs my eyes. Basically anywhere the agent has to make a judgment call about relationship dynamics, that's where I want the wheel back.
@andrea_gill that makes sense! Thanks for sharing. Noting it down 👌
@andrea_gill the relationship aspect is fascinating because two emails can look identical on the surface and require completely different responses depending on who sent them :)
Thanks @andrea_gill! :)
@louislecat @andrea_gill thanks a ton Andrea 😊
@louislecat @andrea_gill Exactly how we see it, Andrea - agent alongside you, never instead of you. Thanks so much!
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.
Thanks @jayhemmady! That means a lot 🙏 Anything specific that you found Upstream to do well? I'm curious!
@jayhemmady thanks so much Jay 🙌🏾
Wow, thank you @jayhemmady! That means a lot, especially coming from someone who’s tried several products in the space.
@jayhemmady Thank you! I'm so happy you like it! I didn't knew how hard it is to make an email client before working with the team. I'm so glad we got it right 🥰
@jayhemmady Means a lot. Draft quality has been a huge focus for us.
This resonates the 200 emails a day problem is brutal and most AI inbox tools just slap a summarizer on top without rethinking the actual workflow. The framing of agents working alongside people rather than just filtering is the more interesting bet IMO.
@ana_popescu2 Completely agree with you. Let's hope this is actually the right bet. Thank you so much for leaving a comment!
@ana_popescu2 Well said. We've always felt that email is more of a workflow problem than a summarization problem. Curious: what’s the best AI inbox product (or other AI tools and tips to manage your inbox) you’ve tried so far, and where did it fall short for you?
@ana_popescu2 curious what kind of agent would help you most in your emails?
@ana_popescu2 Thanks for the support, Ana! 🙏
love it! will easily replace my Superhuman subscription
@amaury_sepulchre2 Love to hear that 💪
@amaury_sepulchre2 🙌🏾🙌🏾
@amaury_sepulchre2 Thank you! Did you know about our team features? they were actually the hardest part to build because email is meant to be personal, not shared. Thanks to them, upstream became the slack for email to me!
@amaury_sepulchre2 best signal we can get, thanks!
I’ve been using Upstream for a few weeks, and it genuinely gave me time back, which not many tools actually deliver on.
@gabriel_hofman That's amazing to hear! Are there any features that could save you even more time?
@gabriel_hofman 🙌🏾🙌🏾
@gabriel_hofman Agree, it's damn hard to replace GMail, let alone improving on it. So happy we got it right! Thank you so much Gabriel!
@gabriel_hofman thanks Gab!
@thomas_perez13 the more we can make email more joyful and less anxiety-inducing, the better 🙂
@thomas_perez13 love that!
@thomas_perez13 Why almost? 😂 What could we improve to make it even more fun? 😁
@thomas_perez13 love to heart this!