Launching today

Upstream
The inbox designed for humans and agents
370 followers
The inbox designed for humans and agents
370 followers
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.








Where do you guys draw the autonomy line on triage vs sending? Those two might fail completely differently IMO. Anyways, great work!
Upstream
@artstavenka1 We think that you should make the final decision when it comes to sending. For triage we automatically sort what needs reply and what needs a follow up. But we allow you to completely customize the prompts.
What's your take on what should be autonomous vs manual?
The voice-matching per audience is what caught my eye — does it learn over time from how you edit the drafts, or is it mostly set from the initial analysis?
Upstream
@doganakbulut Right now it’s mostly set from the initial audience analysis. However, the tone of the drafts do change according to the context of the thread.
That said, learning from how you edit drafts is definitely on our roadmap. It’s the natural next step: the more you tweak tone, phrasing, and structure for a given audience, the better Upstream should get at matching that voice over time.
Sales Compensation Hub
congrats team!
I've a quick question. How can I edit the soul or voice of the agent when writing email draft? Can I create multiple profiles, eg. when writing to a team member, a lawyer, a customer, or a VC?
Upstream
@jelorillon Thanks Jean! You can edit the prompt for your voice by going to Settings > Configure Agents. You'll be able to tweak your global writing style prompt as well as the prompts for each audience. You can also create a custom audience and define your voice for it.
Just curious what are your most common audiences?
The human-agent inbox idea is interesting because email is full of half-finished work, not just messages. The key question for me is trust: when Upstream drafts replies or tracks open loops, does it explain why something matters and what context it used from connected tools before a human acts?
Upstream
@rahulbhavsar great question. Every time Upstream creates a reply or follow up you are able to see why it did so and the context it used from various tools.
LoadFast Snippet Expander
The open-loops part is the bit that stands out to me. Drafting replies is useful, but remembering what needs a follow-up is where email quietly taxes people every day. Curious whether those reminders are purely email-thread based or can pull from Calendar/Granola context too.
Upstream
@vidur_saini We create follow ups on email threads. We also create follow up emails after each Granola meeting, with a summary, action items and recipients added.
What other types of follow ups do you have in mind?
The right test for this category is not whether the draft sounds polished; it's whether the system makes handoff and review legible. For a small shop, knowing what the agent touched and what still needs a human is the difference between leverage and another inbox to supervise.
Upstream
@krekeltronics The agents work for you and nothing gets sent without your approval. Every conversation with an AI drafted reply is clearly marked.
What are the biggest challenges that you are facing with message handoff/review?
Is there an iOS app? Or is it just desktop for now?
Upstream
@clairelabarre Yep we have an iOS app, check it out and let us know what you think 🙂