Upstream
The inbox designed for humans and agents
Details
- External ID
- 1150612
- Source
- PH
- Company
- —
- Product
- Upstream
- Website domain
- producthunt.com
- Launched
- June 18, 2026
- Cohort
- —
- Upvotes
- 976
- Upvotes percentile
- 0.9951923076923077
- Tags
- Email, Productivity, Artificial Intelligence
- Fetched at
- Sept. 7, 2026, 1:22 a.m.
- Updated at
- Sept. 7, 2026, 1:22 a.m.
Description
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.
Enrichment
- Theme
- AI email agents and deliverability
- Vertical
- Horizontal
- Function
- Communication
- Audience
- B2B
- AI stance
- AI feature
- Project type
- Commercial product
- Normalized one-liner
- email inbox for teams and ai agents
- Manually corrected
- False
Could you build this?
Partial Building an AI email agent wrapper is easy, but delivering a full custom email client with real-time IMAP/JMAP synchronization, reliable multi-provider auth, local caching, and low latency is notoriously complex.
What it would actually take: A production email client requires deep familiarity with RFC protocols (IMAP, MIME, SMTP) or integration with specialized infrastructure like Nylas. The frontend requires a robust local database (like SQLite or IndexedDB) with offline-first synchronization, background sync workers, and reliable background webhooks for incoming message processing.
Competitors
Other products that read as similar to this one — 77 launches clear the similarity bar, closest 8 shown.
Attention rank: #3 of 78 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 98 days after the earliest competitor.
- Upstream - The first inbox designed for humans and agents · yc · 2026-06-22 · 11 upvotes · similarity 0.77
- Robin · ph · 2026-09-27 · 9 upvotes · similarity 0.50
- AgentMail · ph · 2026-04-09 · 274 upvotes · similarity 0.50
- Hello Inbox · ph · 2026-09-14 · 244 upvotes · similarity 0.49
- Agent.email · hn · 2026-05-21 · 99 upvotes · similarity 0.47
- AgentMailr · hn · 2026-03-15 · 7 upvotes · similarity 0.46
- Cloudflare Email Service · ph · 2026-04-17 · 167 upvotes · similarity 0.45
- InboxIQ · ph · 2026-09-18 · 1 upvotes · similarity 0.43
Other launches for this product
- No other launches for this product.