PostEra vs Certainly Health
Side-by-side comparison of AI visibility scores, market position, and capabilities
SF AI medicinal chemistry platform with $1B+ pharma partnerships; $610M Pfizer expansion Jan 2025 ($12M upfront) hitting preclinical milestones 40% faster; $26M raised competing with Schrödinger for AI small molecule and ADC drug design.
About
PostEra is a San Francisco-based AI-powered medicinal chemistry and drug discovery platform — backed with $26 million in total funding — providing pharmaceutical companies with the Proton AI platform for designing new small molecules and antibody-drug conjugates (ADCs) that accelerates the design-make-test cycle in drug discovery through machine learning models trained on medicinal chemistry synthesis rules and structure-activity relationships. PostEra has secured over $1 billion in total AI drug discovery partnerships including a $610 million collaboration expansion with Pfizer in January 2025 ($12 million upfront payment plus milestone payments and tiered royalties), and a partnership with Amgen and NIH. In the Pfizer collaboration, PostEra hit preclinical development milestones 40% faster than Pfizer anticipated, validating the AI acceleration thesis at pharmaceutical scale.
SF YC S23 doctor booking with upfront cost guarantees via ML price prediction; $2.3M Pacific 8/YC seed Dec 2023 solving 57% surprise bills and 38% delayed care competing with Zocdoc for healthcare price transparency booking.
About
Certainly Health is a San Francisco-based healthcare price transparency marketplace — backed by Y Combinator (S23) with $2.3 million in seed funding in December 2023 from Pacific 8 Ventures, Y Combinator, institutional investors, and angels — providing patients with a doctor booking platform that shows upfront out-of-pocket costs using machine learning to predict and guarantee healthcare spending before appointments, addressing the surprise medical bill crisis where 57% of Americans have received unexpected bills and 38% delay care due to cost uncertainty. Founded in 2023 by Daryl Sew and Kevin Chiu (Stanford graduate, former Uber engineer, and Uber Health founding member who grew that program to $100 million in 2 years), Certainly Health enables patients with insurance to book doctors while seeing the actual cost they will owe — not the sticker price.
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