Reflections from the World Leaders Forum on how local policies and expectations shape AI products, and what that means for marketing across borders.

Emails matched to each homebuyer's timeline and intent run end to end by JustAI

The multi-armed bandits behind JustAI's decisioning agent, and how we tune thousands of them to get the most out of every campaign's data.

Four things that have happened since our $17.5M Series A

793 live experiments across 30+ brands reveal what lifecycle messaging actually works, broken down by sector, scored on revenue actions, not opens.

Founder's note

General-purpose AI can write emails. It can't learn what converts for your audience. Here's how reinforcement learning in marketing closes that gap.

Move beyond basic triggers. Discover how autonomous AI agents for lifecycle marketing automation drive 1-1 personalization and complex customer orchestration.

Learn how to move beyond rule-based automation. Discover how AI decisioning and real-time orchestration drive algorithmic personalization and better CX.

Personalization is easy to talk about. Making it work across a real lifecycle is harder.

ClickUp’s early activation focused on prompting new users to take key initial actions that predict long-term retention. Since new users lack behavioral history, the effort relied on workspace-level context to guide those actions early.

If you think insurance can’t move at AI speed, meet Lemonade. The future of insurance marketing is AI first personalization, not louder discounts. This is how Lemonade used AI-decisioning to learn fast, cut regret from underperforming variants, and prove that friendly + speed beats “cheap + easy” for conversion.

Ten years ago, marketers moved from spreadsheets to CDPs. Then came marketing automation platforms. Today, it’s time for the next leap — AI-first marketing workflows.

We saw early engagement wins (up to +80% CTR and +35% OR). And then came the right question: “Does this translate to requests and revenue?” That reframed the work, and the product. Thumbtack pushed us to move beyond vanity metrics; they wanted to see if this engagement lift can translate into real revenue. Beyond metrics, the team wanted learnings: which segments actually matter, where personalization pays off, and whether AI can beat human creative.

Coursera and JustAI share a bold vision: build AI-native systems that make personalization effortless, scalable, and ROI-positive. Coursera has long led the charge in applying AI across learning, using it to create courses, coach learners, and assess progress. Just Words brings that same intelligence to lifecycle marketing, making it easy for teams to run hundreds of tests, personalize at scale, and surface insights automatically, without relying on engineers or analysts.

At JustAI, we’ve built an AI-first decisioning platform that continuously learns and adapts, in real time, using reinforcement learning (RL) and large language model (LLM) optimization. This means better personalization, faster learning cycles, and measurable lift without additional manual testing overhead.

Discover how Tumblr achieved a +4.7% lift in push notification performance using JustAI's AI-powered message intelligence platform. See real-world results across 5 high-impact campaigns with dynamic content optimization.

Notion uses JustAI as an autonomous marketer that runs 100+ content variations. One monetization campaign drove a 96% lift in CTRs, translating to $1.34M in annual revenue

It feels surreal to say this, but we’re turning one 🎂 in just four days! A milestone like this calls for a moment of reflection, so let’s take you on a journey through our incredible first year.

8 years ago, I made an impulsive decision overnight.  quit my cushy job at Goldman to join Sensorflow, a 2-month-old company then, as their founding engineer. It meant a 50% pay cut, long hours, and endless chaos. Looking back, I know it was the best decision I made and Just Words wouldnt be the same without that founding experience.

Words matter, especially when it comes to email marketing. BiggerPockets, the leading real estate investing community, understood this principle and partnered with us to transform their email engagement strategy. By leveraging tailored messaging, automation, and machine learning, we helped BiggerPockets achieve an impressive 32% gain in email engagement. Here’s how we did it

Sneak Peek: How JustAI helped Grammarly boost engagement when it comes to digital communication, words are more than just a medium—they’re a powerful tool for engagement. Grammarly, a leader in the writing enhancement space, leveraged this idea to drive incredible results. Here's how we did it:

Here's a shout out to our early believers - people who have been pivotal in our journey at just words. They gave us the extra nudge when the chips were down.

Last month, Jeff Hara and I stepped back to zoom out. What's our end game? Where is the world going to be in 5 years? Getting featured on the Times Square billboard was a good nudge and reminder to think bigger

We had an insightful evening at our first Growth X AI dinner in San Francisco, surrounded by top Growth leaders sharing the hottest takes in AI!

As we grow our team, we have started thinking about how to continously build a culture of respect, learning and more. These 3 slack channels organically helped us get there.

Jeff Hara and I had started co-founder dating but I wanted to take it slow before making a decision. I woke up in a funk one of these days (those sales and investor calls had gotten to me)

The history and evolution of messaging optimizations at Twitter. One of our early hypotheses was that while we were trying hard to find the best Tweets for our users, we were not necessarily presenting them the right way. We framed the problem as “Imagine a restaurant that has the best dishes one could taste. If the dishes are not plated well, not a lot of people would go in”.

Notice something off? Remind you of email spam? Time to rethink it. We spent the last couple of weeks (technically the last 5ish years) exploring short-form copy. This time, we zoomed out, drawing parallels across the industry on how it’s crafted and delivered to users.What if we create a world where every single user sees unique content that is tailored to them?

In the last few months, we talked to 100+ CRM and lifecycle leaders to understand what's chaotic in the marketing workflows, and the world they envision.