Userlens

Userlens is a Y Combinator-backed startup that builds Lumi, an AI adoption agent designed for B2B SaaS product and PLG teams. Lumi connects to a company's analytics and database sources, analyzes individual user behavior, and automatically sends personalized guidance emails to help each customer know what to do next. The product is actively live and accepting signups as of 2026.

What It Is

Userlens sits at the intersection of product analytics and customer engagement. Rather than sending generic onboarding emails or relying on manual outreach, Lumi reads what each user has actually done in the product — sessions, abandoned runs, repeated tasks, unused features — and writes a unique, behavior-specific message for that person. The core workflow is campaign-based: a product team defines an adoption goal and an audience, and Lumi handles identification, message writing, sending, and measurement.

How the Campaign Workflow Works

Lumi's workflow has three stages:

• Adoption goal — the team defines the product behavior they want users to adopt (e.g., enabling plan mode, scheduling reports).
• Audience — Lumi scans connected data sources and identifies which users qualify, with a stated reason for each match.
• Guidance — Lumi generates a campaign brief specifying what each message should achieve, include, and avoid. From that brief, it writes a fully personalized email for every individual in the audience.

The team reviews and approves the brief before any messages go out. Quiet hours, send frequency caps, and skip conditions (e.g., skip users who already adopted the feature) are all configurable in the brief.

Data Sources and Integrations

Lumi is designed to combine two complementary data layers:

• Database integrations (Snowflake, PostgreSQL, BigQuery) — show what each customer is entitled to or has configured.
• Analytics integrations (PostHog, Mixpanel, Amplitude) — show what users actually do in the product session by session.

Combining both lets Lumi surface the "next best action" for each user based on their real state, not just their plan or segment.

Measurement and Adoption Tracking

Success in Lumi is measured in product behavior, not email opens or clicks. After a campaign runs, Lumi tracks which users adopted the target behavior, which stalled, and where follow-up is needed. The homepage shows a vendor-published example chart where plan-mode adopters rose 60%, scheduled reports rose 28%, and prompt quality rose 31% after Lumi guidance — these figures are presented as illustrative product screenshots, not independently verified results.

Audience and Positioning

Userlens targets B2B SaaS companies and product-led growth teams that ship fast and cannot manually track every user's progress. The vendor frames Lumi as giving every account "founder-level attention at scale" — the kind of personalized follow-up a founder would give their first ten customers, extended to ten thousand. The homepage lists customers including Smartly, Lemma, Quartr, Tday, Vainu, and Lamina Labs, and the vendor states that Lumi has analyzed over 984 million usage events as of June 2026.