back to company universe
AI infrastructure

Stamp

Stamp is the first AI Native inbox. It's more than an email client, though -- it's like your second brain. Stamp can respond to emails in your voice, organize your inbox to filter out the noise, keep track of action items, and automate essentially every task you're doing manually in your inbox today.

sources
1
Evidence entries preserved.
affiliations
1
Y Combinator
competitors
6
Mapped from High Signal graph features.
status
generated
D1 lookup
last updated
2026-07-15
16:41 UTC
source evidence
Why this company exists here

Y Combinator

yc-company-directory #5816

Stamp is the first AI Native inbox. It's more than an email client, though -- it's like your second brain. Stamp can respond to emails in your voice, organize your inbox to filter out the noise, keep track of action items, and automate essentially every task you're doing manually in your inbox today.

source
generated read
High Signal interpretation

Stamp is classified as AI infrastructure from source descriptions and fund-directory context. Similar companies below are ranked from offline product facets and meaningful description overlap; category and source affiliation can only strengthen an existing product match. For lookup-created rows, the profile starts as pending enrichment until deeper source collection runs.

offline extraction
Product facets
Stampemail client
mapping method
Similarity graph

Local clusters rerank extracted product concepts and description terms. The generated graph remains the fallback for sparse descriptions: offline reciprocal product-similarity graph: extracted concepts + description terms + bounded category/affiliation boosts. Minimum fallback score: 0; max competitors: 6.

discovery cluster

Companies similar to Stamp

AI infrastructure · 6 peers

A deterministic local cluster built from offline product facets and meaningful description terms. Category and selected-institution affiliation provide bounded tie-breaks. Open any peer to continue exploring its cluster.

Sunsama

match 65

Sunsama organizes your work one day at a time. In the morning, plan your day. Pick out what you want to work on today by importing your tasks and meetings for the day from your various tools. Decide how much time you want to spend on each item to make sure you're setting realistic goals for yourself. As the day goes on, stay focused. Concentrate on one task at a time. Keep track of how long you've been working, and when it's time to shift your attention to something else. When you're done, shut

shared product terms: organize, out, keep, track; shared affiliation: Y Combinator

Hadrius

match 51

Hadrius allows regulated financial firms of all sizes to consolidate and automate their compliance processes using AI in one platform. Today, we're securing compliance for $3T+ AUM across our clients. We're building the AI that will regulate the US financial system and the trillions that flows through it.

shared extracted concept terms: client; shared product terms: automate, today, re, client; shared product theme: workflow automation; same category: AI infrastructure; shared affiliation: Y Combinator

Truewind

match 46

Truewind is a technology company based in San Francisco developing a digital staff accountant. Powered by AI, Truewind is a digital staff accountant that never sleeps, never gets sick, and always does its work. Completely predictable capacity planning. Automate data categorization, supporting documentation collection, and client follow-up. Truewind’s AI agents will follow up on outstanding action items while the accountant can work on strategic tasks. This is fully integrated and unified across

shared product terms: client, action, item, automate; shared product theme: workflow automation; shared affiliation: Y Combinator

Pledge Health

match 46

Our AI browser assistant automates insurance tasks like verifying benefits, submitting prior auths, checking claim statuses, and more across all payer portals, directly from the clinic's EHR. It does exactly what the admin team is doing today, just helps them do it 10x faster and as thoroughly as a seasoned teammate.

shared product terms: like, automate, task, doing; shared product theme: workflow automation; shared affiliation: Y Combinator

Willow

match 43

Willow is an AI dictation app that lets you type with your voice. Built to 4x the productivity of anyone spending too much time on email, docs, and AI prompting workflows. We’re Mac-only for now. You can try it free at WillowVoice.com

shared extracted concept terms: email; shared product terms: voice, email, re; shared product theme: workflow automation; same category: AI infrastructure; shared affiliation: Y Combinator

Rapportive

match 43

Rapportive shows you everything about your contacts right inside your inbox. You can immediately see what people look like, where they're based, and what they do. You can establish rapport by mentioning shared interests. You can grow your network by connecting on LinkedIn. Imagine relationship management built into your email. For free.

shared extracted concept terms: email; shared product terms: inbox, like, re, email; shared affiliation: Y Combinator