notificationharbor
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Notification Harbor — cinematic harbor scene with electric blue notification trajectories
Email that understands.

Write your campaigns. We dock the rest.

Notification Harbor is the AI-native email platform. Describe what you want to send in plain English — we generate copy, personalize per recipient using real engagement signals, and deploy in 30 seconds. No drag-and-drop. No templates. Just outcomes.

Start free → no credit card See how it works
SOC 2 Type II 99.98% uptime GDPR ready API-first
0x Higher click-through vs. static blasts
0s From idea to first send
0% Average inbox placement
0ms p99 API response — write to queue
Notification Harbor composer — type a plain-English prompt on the left, see the personalized email preview render on the right.
Compose in plain English. Deploy in 30 seconds.
Why teams switch

Email infrastructure, without the drag-and-drop tax.

Mailchimp was built for newsletters. Notification Harbor was built for product teams who treat email like a service — versioned, observable, and shipped through code or English.

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Plain English campaigns

"Send Friday product update to power users who logged in this week — playful tone, mention the new export." That's the brief. We write it, segment it, ship it. Edit in natural language, never in a WYSIWYG.

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Real-time personalization

Each recipient gets a slightly different email — subject line, hero copy, CTA, send time — generated at queue time using their actual engagement history. Not "Hi {first_name}". Real signal-driven rewriting.

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30-second deploy

From "I want to send this" to "the first message hit an inbox" in under 30 seconds. Includes preview, deliverability check, subject A/B/n setup, and rollout. We've timed it 12,000 times.

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API-first, always

Every UI action has a REST + webhook equivalent. Send events stream over Server-Sent Events. Drop our SDK in Node, Python, Go, Rust, Elixir. Your engineers will thank you. Your CFO will thank you for the lower seat count.

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Anchored to your CRM

Bidirectional sync with HubSpot, Salesforce, Attio, custom Postgres. Your data is the source of truth — Harbor reads, writes, and respects it. No more "but Mailchimp has a different unsubscribe list."

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Observability built in

Every send is a trace. Deliverability per-domain, per-template. Open and click events with full causal lineage. Plug Harbor into Datadog, Honeycomb, Grafana — no custom pipeline.

How it works

Three steps. One deploy.

Notification Harbor exposes a single primitive: a campaign. Everything else — segmentation, personalization, throttling, retries — is inferred from it.

Three glowing nodes — quill, target, and paper-plane — connected by electric-blue lines representing the write, target, deliver flow.
Write → Target → Deliver.
01 / BRIEF

Describe in English

Open a campaign and type. Specify audience, tone, what should change vs. last send, what success looks like. We parse it into structured intent.

// Campaign brief
audience: power users
tone: friendly + technical
goal: 8% CTR on new export
avoid: anything fluffy
02 / GENERATE

Harbor drafts variants

We generate 3-5 subject lines, an inbox-optimized preheader, and per-segment body variants. You see all of them side-by-side, mark the ones you like, edit any cell directly.

// Returned
subjects: "Your weekly export, now in CSV"
preheader: "3 clicks to download"
variants: 5 (auto-scored)
03 / DOCK

Ship in 30 seconds

One button. We rehearse the send against a test slice (1% of audience), validate inbox placement, then roll out at send-time intelligence-optimized pacing. Watch the trace stream in.

// POST /v1/campaigns/:id/dock
status: "queued"
eta_first_send: "14s"
eta_complete: "4m 20s"
Notification Harbor analytics dashboard showing per-segment open rate, deliverability, and time-to-deploy metrics with electric-blue line and donut charts.
Per-segment open rate, deliverability and time-to-deploy — all in one pane.
Pricing

Pay for what you send. Nothing else.

No seat tax. No "Marketing Pro" upsell. The free tier is generous, the paid tier scales linearly, the enterprise tier is for teams that want a single-tenant deployment.

Starter

$0 / forever

For solo founders and side projects.

  • Up to 1,000 contacts
  • 5,000 sends / month
  • Plain-English campaigns
  • Real-time personalization
  • API + webhooks
  • Community support
Start free
Most popular

Crew

$49 / month

For product teams shipping email like infra.

  • Up to 25,000 contacts
  • 200,000 sends / month
  • Multi-variant testing
  • CRM bidirectional sync
  • Custom domains + DKIM
  • Slack + email support
  • SOC 2 audit trail
Start 14-day trial

Fleet

Custom

For enterprises and high-volume senders.

  • Unlimited contacts
  • Volume pricing per million
  • Single-tenant deployment
  • Dedicated IPs + warmup
  • Custom retention + DPA
  • 24/7 support, named CSM
  • 99.99% SLA
Talk to sales
FAQ

Common questions, uncommon answers.

Is "AI-native" just a prompt wrapper around ChatGPT?
No. We run a fine-tuned model trained on millions of opt-in marketing email exchanges, tied to a deliverability classifier that scores every variant before send. The LLM produces copy; a second pass scores for spam triggers, brand-voice drift, and inbox placement. Then the recipient-side personalization happens at queue time using their behavioral fingerprint — not the LLM.
Can I bring my own subject lines or do you generate everything?
Both. You can paste a fully written campaign and we'll only run the personalization layer — or hand us a one-line brief and we generate the whole stack. Most teams find a hybrid wins: human writes the headline, Harbor generates 4 variants, the team approves 2, and Harbor decides which to send to which recipient.
What about deliverability — won't AI-generated email look spammy?
The opposite, in practice. Generic templates from any platform trip spam filters because millions of senders use them. Each Harbor campaign is unique by recipient. Average inbox placement across our customer base is 98.4% — versus the industry average of ~83% for transactional-style senders.
How do I migrate from Mailchimp / Klaviyo / Resend?
Import CSVs, drop in a one-line API key swap (for Resend / Postmark equivalents), or use our HubSpot / Salesforce / Attio sync. Average migration takes 90 minutes for ~50k contacts. We don't ask for an export of your unsubscribe list — we accept yours as the source of truth.
Where does my data live? GDPR? SOC 2?
SOC 2 Type II. GDPR-compliant by default. Data residency in US (Oregon), EU (Frankfurt), or single-tenant deploy in your VPC on Fleet. We don't train models on customer content unless you explicitly opt in (and offer a credit if you do).
Is there a free trial on the Crew plan?
Yes — 14 days, no credit card. You can send up to 10,000 emails during the trial. If you don't convert, the campaigns and contacts stay; you drop back to Starter limits.
About

Built by engineers who used to send emails.

We spent a decade running growth and transactional email at Stripe-adjacent companies, watching marketing teams hand-stitch HTML templates while engineering teams patched in conditional logic at 2 a.m. Notification Harbor is the tool we wished we had: code-first, observability-native, with an LLM that earns its keep on every send — not a chatbot bolted onto a drag-and-drop editor.

No drag handles. No "newsletter wizards." Just a primitive that does one thing well, and gets out of the way.

Silhouette of an engineer over-the-shoulder at a glowing terminal, building the email infrastructure behind Notification Harbor.
The team behind Harbor — shipping email like infrastructure since 2019.

Anchor your email stack in 30 seconds.

Free forever for the first 1,000 contacts. No credit card. No drag-and-drop. Your first send will dock before you've finished your coffee.

Start free Book a 15-min demo