back to company universe
Developer tools

Lob

Lob provides the building blocks for developers to automate the offline world. Enterprise companies use Lob’s suite of APIs to mail fully dynamic and personalized customer communications with print media. We provide insight into deliverability with piece-by-piece tracing and utilize our proprietary Print Delivery Network to streamline production across fully redundant nodes all over the country. Founded in 2013 and based in San Francisco, Lob is venture backed by Y Combinator, Polaris Partners,

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 #858

Lob provides the building blocks for developers to automate the offline world. Enterprise companies use Lob’s suite of APIs to mail fully dynamic and personalized customer communications with print media. We provide insight into deliverability with piece-by-piece tracing and utilize our proprietary Print Delivery Network to streamline production across fully redundant nodes all over the country. Founded in 2013 and based in San Francisco, Lob is venture backed by Y Combinator, Polaris Partners,

source
generated read
High Signal interpretation

Lob is classified as Developer tools 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
Print Delivery NetworkEnterprise companiesAPIspiece-by-piece tracingdevelopers
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 Lob

Developer tools · 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.

Mailgun

match 104

Mailgun is a developer-focused email delivery platform that empowers companies to send, receive, and track transactional and marketing emails through an API. Founded in 2010, Mailgun became a Y-Combinator success story later acquired by Rackspace. In February 2017, Mailgun spun back out as a standalone business focused on building best-in-class email deliverability solutions. We are headquartered in San Antonio with remote teams in San Francisco and Austin. Customers like Slack, Lyft, Github, an

shared extracted concept terms: companie; shared product terms: developer, companie, customer, deliverability; shared product theme: developer infrastructure, sales and marketing; same category: Developer tools; shared affiliation: Y Combinator

Flotype

match 82

Flotype Inc. is a venture-backed company building a suite of enterprise technology for real-time messaging. Flotype takes a unique approach by building developer-friendly technologies focused on ease-of-use and simplicity, while still exceeding enterprise-grade performance expectations. Flotype licenses enterprise-grade middleware, Bridge, to customers ranging from social web and software enterprises to financial and fleet management groups. Other offerings include NowJS, a free, open-source fra

shared extracted concept terms: enterprise, developer; shared product terms: venture, back, suite, enterprise; shared product theme: developer infrastructure, sales and marketing; same category: Developer tools; shared affiliation: Y Combinator

authzed

match 71

We build the tools companies need to provide performant and scalable authorization for their applications. We’re founded by 3 successful entrepreneurs with expertise in enterprise software, most recently as leaders at Red Hat. Jake and Joey met on the APIs team at Google in 2010. They went on to found Quay, where Jimmy joined as their first hire. Over the past decade, they’ve changed the landscape for building and deploying software.

shared extracted concepts: apis; shared product terms: companie, found, enterprise, apis; shared product theme: developer infrastructure; same category: Developer tools; shared affiliation: Y Combinator

SoundFocus

match 60

SoundFocus is a San Francisco, CA-based startup creating the next generation of personalized mobile audio products. The company was founded by Alex Selig and Varun Srinivasan in September of 2012 with the mission of helping the world hear better. The company is a graduate of the Y Combinator summer of 2013 batch and announced their first hardware product, the Amp case, in October 2014. Investors include Kapor Capital, Y Combinator, VegasTechFund, OVO Fund, RTA Capital and August Capital Partners

shared product terms: san, francisco, personaliz, found; same category: Developer tools; shared affiliation: Y Combinator

All Screen

match 49

140Fire is the fastest growing online video ad network. Brands and agencies utilize 140Fire for it's suite of engagement and data tools which make media buying 10x more effective when it comes to running video ads. Backed by Y Combinator, Mark Cuban, Jonathan Kraft and Skip Paul, 140Fire is based in Santa Monica and has 15 employees.

shared product terms: network, utilize, suite, media; shared affiliation: Y Combinator

HelloBlock

match 16

Hello Block provides node hosting for mainnet and testnet.

shared product terms: block, node