TL;DR: The closest YC-backed alternatives to <strong>Sift</strong> are other Y Combinator B2B companies, especially from the Summer 2011 batch. Below are 20 ranked competitors with batch, status, and team size.
Y Combinator-backed B2B companies similar to Sift (YC Summer 2011).
Last verified:
FirebaseYC Summer 2011 · Acquired · 500 people— Build and grow iOS, Android, and Web apps.
SegmentYC Summer 2011 · Acquired · 550 people— Software and APIs to collect, clean, and control customer data.
HackerRankYC Summer 2011 · Active · 300 people— Change the world to value skills over pedigree
VidyardYC Summer 2011 · Active · 201 people— Video for business.
RealmYC Summer 2011 · Acquired · 51 people— Better data structures = no DB.
ComposeYC Summer 2011 · Acquired · 51 people— We make it easy to run databases. PostgreSQL, Redis, MongoDB,…
ApolloYC Summer 2011 · Active · 200 people— Apollo helps engineering teams accelerate delivery
Citus DataYC Summer 2011 · Acquired · 45 people— Real-time. Big data. PostgreSQL
ParseYC Summer 2011 · Acquired · 11 people— Parse is the easiest way to build apps.
Perfect AudienceYC Summer 2011 · Acquired · 11 people— Self-service display advertising for SaaS and online retail.
PageleverYC Summer 2011 · Acquired · 11 people— Facebook analytics. Acquired by Unified in January 2013.