Loops.so

Operator's take

Loops.so is a purpose-built email tool for teams shipping software products — it sits at the intersection of marketing email (campaigns, announcements) and product email (onboarding drips, behavior-triggered sends), both routed through one workspace and one API. The positioning assumes you are a SaaS team that needs to talk to users at signup, activation, churn risk, and feature launch without stitching together a separate ESP plus a transactional provider. Worth evaluating when the current stack is Mailchimp (too generic) or a hand-rolled SendGrid setup (too much code for the marketing team). Not a match for large enterprises needing deep segmentation logic or for businesses outside the software vertical whose audiences do not map to the SaaS user lifecycle.

What it's good at

• Behavior-triggered emails via API — send transactional and lifecycle emails based on user events in your product without managing a separate transactional provider.
• Drag-and-drop campaign editor — build and send one-off announcements (feature launches, newsletters) without writing HTML; pre-built SaaS-pattern templates reduce setup time.
• Onboarding sequences — multi-step drip flows tied to signup and activation events; the canonical use case the platform is tuned for.
• A/B testing — test subject lines and content variants to improve open and click rates; built into the campaign layer rather than requiring a separate tool.
• Real-time analytics — open rates, click-throughs, and per-contact engagement history surfaced without leaving the platform.
• Agent-native tooling — "Loops Agents" ships a CLI, skills for Claude Code / Codex / Cursor, an LMX XML email format for programmatic content, and a Campaign API for drafting emails from code; MCP support is on the roadmap.
• Free tier — up to 1,000 subscribed contacts and 4,000 sends/month at no cost (enough for weekly sends); paid plans scale by contact volume with no per-seat fees.

What it's not

• Not a heavy automation engine — the workflow builder supports branching and filters but stops well short of CRM-style journey orchestration or deep conditional logic; Customer.io or Iterable cover that territory.
• Not designed for enterprises — the platform targets small-to-mid-size SaaS teams; large orgs with complex segmentation or compliance requirements will hit ceilings.
• Not a general-purpose ESP — the SaaS-lifecycle framing means the templates, triggers, and defaults assume a software product; e-commerce, B2C publishers, or service businesses are an awkward fit.
• Not a Mailchimp replacement if you need landing pages or broader marketing features — Loops.so is email-only by design.