Upstream

What Upstream does

Upstream is an AI-native email platform that organizes your inbox, reduces noise, and drafts replies and follow-ups in your voice. It helps users feel lighter and more focused by splitting the inbox into actionable categories, automating email sorting, and generating personalized AI drafts for replies and follow-ups. The platform offers features for individuals and teams, including custom voice and tone, smart follow-ups, and collaboration tools.

Products

• UPSTREAM COREFor everyday email and collaboration, includes AI Drafts in your Voice & Tone, Smart Follow Ups, Custom voice with up to 3 audiences, Split Inboxes, Team comments, Unlimited channels and search, Up to 5 team seats, Mobile access.
• UPSTREAM PROFor high-performing teams and individuals, includes everything in Core plus Complete AI Power & Control, Unlimited AI drafts & Follow Ups, Fully customizable Voice & Tone, Advanced AI models, Control which emails need replies and follow ups, Unlimited Team Collaboration, Private channels, Unlimited channel and comment history, Unlimited team members, White-Glove Experience, 1-on-1 training, Remove 'Sent with Upstream' signature, Use Upstream across multiple accounts.
• UPSTREAM MAXFor large organizations with advanced security and AI needs, includes everything in Pro plus Personal AI agents, Team-wide AI automations, Enterprise security & governance, Dedicated support & onboarding.

Key capabilities

• AI Drafts in your Voice & Tone
• Smart Follow Ups
• Custom voice with up to 3 audiences
• Split Inboxes
• Team comments
• Unlimited channels and search
• Mobile access
• Unlimited AI drafts & Follow Ups
• Fully customizable Voice & Tone
• Advanced AI models
• Control which emails need replies and follow ups
• Private channels
• Unlimited channel and comment history
• Unlimited team members
• 1-on-1 training
• Remove 'Sent with Upstream' signature
• Use Upstream across multiple accounts
• Personal AI agents
• Team-wide AI automations
• Enterprise security & governance
• Dedicated support & onboarding
• AI search
• All Open AI models
• All Claude models
• Configure prompts for all AI features
• Granola integration
• Multiple inboxes
• Snooze
• Send later
• Undo send
• Instant send
• Command palette
• Themes
• Thread sharing
• Shared channels
• Channel rules
• Email support
• Email & video support
• Priority email & video support
• Productivity coaching
• All-in Enterprise Pricing
• Technical support

Use cases

• Organizing inbox
• Reducing email noise
• Drafting replies
• Drafting follow-ups
• Pre-sorting messages that need a reply
• Categorizing emails into Splits (Primary, Linear, Noise)
• Moving cold emails and newsletters out of the way
• Identifying writing patterns for personalized prompts
• Generating AI drafts based on recipients, thread context, and past messages
• Bringing important conversations back at the right time with an AI draft
• Assessing message context to determine follow-up timing
• Generating follow-up drafts considering other threads with recipients
• Team collaboration on emails

AI approach

Upstream uses AI to organize inboxes, draft replies and follow-ups in the user's voice, and prioritize emails. It leverages both OpenAI and Claude models, and allows for custom voice and tone settings.

Tech named: OpenAI models, Claude models

What it says sets it apart

• AI-native platform
• Organizes inbox into actionable Splits (Primary, Linear, Noise)
• AI drafts replies in user's voice, tailored to each conversation
• AI identifies writing patterns to create personalized prompts
• AI brings important conversations back at the right time with a draft
• Contextual assessment for follow-up timing
• Offers personal AI agents and team-wide AI automations for enterprise users

Funding rounds we track

From the AI funding tracker — rounds as reported by the linked publications.