Marketing Startups funded by Y Combinator (YC) in the San Francisco Bay Area 2025

Company Information Weebly is a consumer service that gives people a surprisingly easy and affordable way to create a site that is as unique as they are. Weebly lets entrepreneurs start something and showcase their work. With a Weebly site, people can communicate with their clients, promote their works to potential buyers, share their story with like-minded people, and be an authority on personal and professional interests. Weebly offers a range of pricing options, including a free plan and premium plans starting at $4/month. Weebly sites are optimized to work brilliantly across computers, phones and tablets. Global Growth Over 20million people around the world have started a site on Weebly Weebly sites receive over 100,000,000 unique visitors each month Weebly is offered in 11 languages: English, French, Spanish, Italian, German, Portuguese, Dutch, Chinese, JPese, Russian and Turkish Weebly is privately funded by Sequoia Capital, Baseline Ventures, Ron Conway, and Y Combinator.

Webflow is the leading no-code visual web development platform. It seamlessly generates sophisticated code so anyone can build powerful web-based businesses and adapt to changes without developers or months of building. From entrepreneurs and creative agencies to Fortune 500 companies, Webflow makes the internet a more inclusive place by making the tools to build on it more accessible to more people, fueling business growth. Webflow powers websites for innovators like Discord, Monday.com, IDEO, Orange Theory Fitness, TED, and Dropbox. Webflow is backed by Y Combinator, Accel, CapitalG, Silversmith, and other awesome investors.

Videopixie is a marketplace for video production that allows users to have great video on the website, such as promotional videos and etc. Videopixie is a marketplace where you can hire the world’s best video professionals at a range of price points, to fit any budget. Retailers use Videopixie to make weekly product videos. Game companies use Videopixie to make trailers, using in-game footage, to air on national TV. Newly-weds use Videopixie to edit their five hours of ‘big-day’ footage into a five minute keepsake for life.

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, Floodgate, and First Round Capital. Find out more about Lob and what we’re up to by following our blog: https://lob.com/blog or visiting our website: https://lob.com.

At Sentiyen, we build GPT-based AI assistants that are trained on your content and enable your audience to get the answers they need 24 hours a day. We allow creators and businesses scale themselves to unlimited 1:1 conversations with potential customers, which helps increase revenue, reduce spend, and improve customer satisfaction.

Banabo is the first Marketing Attribution OS with the mission of getting a company’s marketing waste to zero. We help companies achieve this goal by mapping a website visitor’s entire journey through a sale, and showcasing the true impact of each touchpoint. Accurate attribution previously wasn’t possible due to GDPR in the EU, CCPA in California, and the iOS 14 Privacy Changes. And with Google banning tracking cookies in 2023, we’ve built the first fully cookieless marketing attribution solution, using zero personal data.

Revl is an experience technology company and Y Combinator 2016 Winter Batch member launching the Revl Arc smart action camera. Designed in coordination with frogVentures, Sony, Ambarella and leading engineers with backgrounds at NASA, HP and Sikorsky Aircraft, the Revl Arc is available for preorder and will begin shipping in December. Revl was founded in 2015 and is based in San Francisco. For more information, please visit www.revl.com

We fix and monitor emails in spam. We monitor automatically where your emails is going, we alert you when it's going in spam and we fix it with you. Best of all, the monitoring is free!

Truva handles the busywork intelligently saving your sales team hours each week, so they can focus on what matters most - building and closing deals. Many teams have seen up to 25% increase in sales where Truva's AI agents automated tedious tasks such as email follow up, CRM data entry, and process optimizations.

Today companies spend over $1T to bring customers to the door, but $19 of every $20 they spend does not convert to revenue. Companies have no choice other than to dedicate large engineering and data science teams to manually build more relevant, higher converting experiences for different customer segments. Mutiny is a no-code AI platform that helps marketers convert their top of funnel demand into revenue, without engineers. Mutiny gives marketers everything they need to drive revenue and prove it — from data and analytics to AI-powered recommendations and content writing. We are backed by Sequoia Capital, Tiger Global, Insight Partners, Y Combinator and CMOs from some of today’s fastest-growing tech companies including AngelList, Carta, Gong, Salesforce and Snowflake.

From MIT's App Inventor and YCombinator's W2016 batch, Thunkable allows anyone to build powerful native apps. With Thunkable, it's simple to design, and simple to code-- simply drag and drop to create fast, native, reliable apps. You don't need to download large development suites, command-line kits, or simulators. You can use the many built-in app templates as they are, or make changes. Make your changes online and see them on your device instantly with the Thunkable mobile app. Upload your apps directly to the Play Store or App Store or send them to friends!

HOKALI is the marketplace for buying after-school programs and enrichment activities with high-quality, vetted vendors in the US. We simplify the process of booking, organizing, and managing after-school programs and camps for schools.

Founded in 2015, Apollo.io is a lead intelligence and sales engagement platform trusted by nearly 9,000 paying customers, from rapidly growing startups to some of the largest global enterprises. Our community-based approach to crowdsourcing data gives users maximum coverage while ensuring data accuracy. Our advanced algorithms and unique data acquisition methods help over 500,000 sales professionals enrich and analyze prospects' data to increase quality conversations and opportunities. We have notable investors: Y Combinator and Nexus Venture Partners. We recently completed a Series B financing to fuel our next growth phase. We have reached and maintained profitability for the last 18 months. Our growth and customer feedback set us apart from competitors. Apollo had over one million sign-ups for its platform in the past year, and the number of weekly active users increased by over 400%. We are a top-ranking G2 Crowd vendor in the Sales Intelligence, Lead Intelligence, Marketing Account Intelligence, and Sales Engagement categories. Our highest scores are in the B2B data space for accuracy and ROI based on customer reviews.

We're a mobile attribution and analytics provider, focused on helping app developers, marketers, and publishers find and grow their users. We track a bunch of metrics such as ad spend, ad revenue, in-app purchase revenue, subscription revenue, retention, etc. We also have a data warehousing product that lets our customers directly query the data we've collected. Experts at mobile advertising, need help with handling all of this data and making a very technical front-end more user-friendly.

AI-driven push marketing tool for mobile apps, that can be integrated in hours, without any code writing. nGrow connects to behavioral data from analytical systems like Amplitude, Google Firebase, Mixpanel etc. and allows to setup auto push campaigns with an hours. It's as simple as running Google or Facebook but in push notifications channel. nGrow.ai customers usually got their up to 30% incremental Revenue lift. We got Amplitude COO and ex-Google advisors on board

mth sense focuses on finding solutions to "blind" ads. mth sense offers its users an audience library to target certain demographics and psychographics.

eBrandValue, Inc. is a Mountain View, CA-based company that acts as a BI platform for brands and leverages social data to forecast sales and provide competitive intelligence. Its unique proprietary algorithm essentially captures consumer behaviour and brand affinities using social data to identify the most effective profile changing events. 

 eBrandValue has become a de facto forecaster of sales in many industries by accurately predicting and reporting the real-time sales, ROI, brand performance and market share-impact of brands in comparison to all of their competitors. These predictions are confirmed by Nielsen’s ScanTrack, which once again emphasises the catalytic impact of next-stage intelligent social media analysis to sales strategy.
 eBrandValue enables brands to measure the efficacy and ROI of their events and campaigns, and to track and analyse influencers within their industry. It also provides Meme-Based Netnographic Segmentation which reveals the dimensions that define a brand and encapsulate the nature of social media postings in the sector, thus allowing brands to track their positioning vis-à-vis competition in real-time.
 eBrandValue recently graduated from Y Combinator’s Winter’15 batch, and received press coverage at VentureBeat. Additionally, eBrandValue was also showcased as part of the Start Up Academy during Cannes Lions as one of the ten globally selected startups that are currently disrupting the marketing/agency business.


Open source mobile marketing automation and customer onboarding platform. Alternative to braze customer io / iterable / pendo / appcues . Segment and engage your users with complex scheduled push notification, sms and email campaigns.

OneSignal is the leading omnichannel customer engagement solution, powering personalized customer journeys across mobile and web push notifications, in-app messaging, SMS, and email. Our easy-to-use interface empowers content creators to focus on quality user engagement instead of complex implementation. Our powerful platform enables over a million businesses to deliver 10 billion messages daily and 1 in 7 new apps launches using OneSignal! We support companies in 140 countries, including Zynga, USA Today, Bitcoin.com, Upwork, Tribune, and many more - from startups and small businesses just getting off the ground to established companies communicating with millions of customers.

OmniVirt is 360° Virtual Reality advertising platform for brands and publishers. Audiences can view 360° content with just one tap of their fingertip on smartphones, tablets and websites. No app installation or VR headset required. HTML5 / VAST complaint. Our company is specialize in mobile formats, the network optimizes revenue for publishers and serves billions of ad impressions in more than 200 countries.

Zyper is a machine learning-led community marketing tool that enables brands to identify and engage with the top 1% of their social following, turning them from passive followers to active advocates. These brand fans create authentic and emotive content, scaling peer-to-peer advertising in a unique way by uplifting market voice, engagement and social conversion. Neither micro-influencers nor bloggers, brand fans are real, social-savvy consumers who influence their immediate peer group and immerse themselves in your brand ecosystem. We target them at scale to give you the equivalent reach of one influencer but with the value of repeat content, authenticity and higher engagement.

Perfect Audience is a retargeting platform that lets businesses bring back lost customers and get more sales effortlessly.

Priceonomics is the price guide for everything. Price guides are helpful for buying and selling used things. How much should I spend on this used bicycle on Craigslist? How much should I sell my stereo system for on eBay? Is this used Vespa a good deal, or what?

Outbound organizes the messages you send around the actions your customers take. We allow non-technical marketers and product people to set up automated email, push notification, SMS or voice messages when you need your users to take an action, then test how well each message works.

A LITTLE ABOUT VIROOL Virool is a video distribution platform for brand marketers that leverages programmatic technology to reach key influencers, making content more engaging and the ability to share easier than ever. Having served more than 75,000 global campaigns, Virool’s robust ActivView product suite and in-article native unit, deliver fully transparent and insightful analytics that offers viewability guarantees, emotional resonance and fraud protection. Within our platform, users can leverage a proprietary DMP of 450MM unique profiles to build custom, addressable audience segments across all screens. More than 100,000 multi-channel sites have activated video content from Virool via partnerships including Rubicon Project and direct native placements. Founded in 2012, Virool has raised $18.62M in funding from a collection of top VC firms and angel investors, including $6.62M in its seed round. It is the biggest seed investment that anymore Y-Combinator graduate has ever received.

ClearBrain (YC W18) is a startup building the first self-serve AI platform for growth marketing. We help companies automatically predict and retarget users when they are most likely to purchase. Fortune 1000 companies use ClearBrain’s automated machine learning platform to personalize experiences for hundreds of millions of user predictions - as effectively as Uber or Google. We’re led by the founding engineers of Google Ads and Optimizely’s data infrastructure teams, and backed by investors in Dropbox, Optimizely, and AdMob. We’re a deeply technical team who value humility and customer empathy above all. As a group we’re also pretty good at bowling, D&D, and Rubik’s cubes. We are building an advanced analytics platform with the challenge of making it accessible to a smart, capable clientele of growth experts that demands ease of use, utility, high availability and good responsiveness. You’ll join a startup environment where you'll be exposed to a variety of backend, frontend, machine learning frameworks in a fast-moving company!

AdGrok allows business owners to automate the process of choosing and bidding on keywords on Google AdWords.

Boostable makes advertising easy for sellers and brands on marketplaces. We grow marketplaces by helping their sellers advertise their listings and gather insights. Boostable is a YCombinator company based in San Francisco and funded by SVAngel, 500 Startups and others.

LiftIgniter uses cutting edge data science to help publishers and retailers optimize their websites and mobile apps in real-time. Machine learning personalization puts the perfect piece of "content"​ (video, article, item to buy) in front the user at the exact moment when they are most likely to engage or convert - no tags or manual work required. The machine learns and updates itself so that's it's always perfectly in sync with your users and your "content."​ We average 50% improvements in CTR, engagement and conversation - with only a day's work on your part. Imagine creating a truly dynamic, real-time digital property that enables the perfect experience for that user impression at that moment in time. That is LiftIgniter! Our team of PhDs has direct experience building state-of-the-art personalization systems at the petabyte scale for some of the largest companies on the planet. Unless you plan on hiring your own team with deep experience (not likely since very few people with that experience exist), you should contact us to talk about how we can supercharge your digital experiences.

hute powers enterprise UGC for brands, agencies and publishers – from discovering consumer photos and videos, both with visual and text search, to the ideation, production, and amplification of compelling visual material. Chute works with some of the world’s biggest brands and publishers including Benefit Cosmetics, NBCUniversal, adidas, Brown-Forman, Condé Nast, NBA, United Nations, New York Times, and Ford. For more information, visit www.getchute.com. You can reach us anytime at hello@getchute.com. We look forward to hearing from you!

Moki.TV is a directory of all paid and free content included on Amazon's streaming service, Netlfix, Hulu, iTunes, and others.

Indivio's video creative automation capabilities enable modern marketing teams to more easily deliver dynamic video experiences that improve business outcomes.

YesGraph helps your app grow by recommending exactly who a user should invite. We can help boost the performance of referral and invite flows in your app or web site. We use machine learning and social graph analysis -- a lot like "People You May Know" on LinkedIn!