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Sendblue (YC S23) — iMessage for sales

Sendblue provides businesses with virtual iMessage lines to text prospects and nurture leads. Our users on average see a 70% increase in response rate.

Sendblue is a Y Combinator company in the Summer 2023 batch. Its directory entry describes it as: iMessage for Sales. The founders listed are Rob Haber (Founder), Alex Luis (Founder) (Y Combinator directory entry, August 9, 2023).

6 more companies from YC Summer 2023 ↓

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Sendblue

New accelerator entry · 2023-08-09 · the record

Summer 2023
batch
50
people
Early
stage
United States of America
region
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What the record says

BatchSummer 2023
Announced2023-08-09
StageEarly
StatusActive
Team size50
IndustryB2B
Sub-industryB2B -> Sales
RegionsUnited States of America, America / Canada, Remote, Partly Remote
BasedNew York City, NY, USA
HiringYes
Sitehttps://www.sendblue.com
Founded2023
YC group partnerPete Koomen
Launches posted on YC1
Open roles listed4
Previously known asRound One, Raz, Sendblue, Raz

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Also in YC Summer 2023

Same batch, B2B first.

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In their words

Sendblue provides businesses with virtual iMessage lines to text prospects and nurture leads. Our users on average see a 70% increase in response rate. The company is founded by Rob Haber, former ML Engineer at Scale AI, and Alex Luis, former PM at PwC's telecom practice.

Want the whole picture on Sendblue?

Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News

A Full Report on Sendblue: verified, sourced, every claim cited, ready in a few minutes. See pricing.

What the Full Report on Sendblue covers

  1. The Short Answer

  2. Which Company This Is

  3. What They Do, And How The Money Works

  4. Who Runs It, And How To Reach Them

  5. The Money: Funding, Valuation, Runway

  6. Who Pays Them, And Who They Are Up Against

  7. Warning Bells

  8. Sources

    7 cited sources found

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If you're behind Sendblue: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. GetFoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.

Sourced from the company's Y Combinator directory entry, from the company's own site, read directly on 2026-09-27 (sendblue.com), and from Hacker News, where 2 threads met the matching rule stated beside the count.

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Sendblue: Accepted into Y Combinator Summer 2023
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Permanent URL: https://mentionfox.com/funding/yc-sendblue
Last updated 2026-10-23
Primary record: Y Combinator directory entry
Sendblue (YC S23) — iMessage for sales. MentionFox, 2026-10-23. https://mentionfox.com/funding/yc-sendblue