Tool profile

Notification Harbor

API-first email platform that writes campaigns from a brief, billed on sends not contacts

Free tier49 USD per month for Crew (Starter is free), rising to custom pricing for Fleet

OverviewFacts verified October 2026

Notification Harbor writes campaign copy and subject lines from a plain-English brief, personalises each message at queue time from engagement history, and exposes REST, webhooks and SDKs for Node, Python, Go, Rust and Elixir. Billing is by sends rather than stored contacts: Starter is free up to 1,000 contacts and 5,000 sends a month, Crew is 49 USD a month for 200,000 sends, and Fleet is quoted.

Visit Notification Harbor

Is Notification Harbor worth it?

What it is: API-first email platform that writes campaigns from a brief, billed on sends not contacts
Worth a look if: Notification Harbor fits a product or engineering team that wants to send up to 200,000 emails a month for 49 USD on Crew, driven by API and a plain-English brief rather than a drag-and-drop editor.
Skip it if: You want a template library or drag-and-drop builder (the homepage says there is none), or you need Fleet terms, which are quoted only through sales.
Cost to start: 49 USD per month for Crew (Starter is free), rising to custom pricing for Fleet. Yes. Free plan with up to 1,000 contacts and 5,000 sends a month. Crew has a 14 day trial.

Notification Harbor at a glance

Job category	Automation and Lifecycle
What it replaces	Writing, segmenting and scheduling product email by hand or through a template-based sender
Pricing model	Free tier
Starting price	49 USD per month for Crew (Starter is free), rising to custom pricing for Fleet
Free tier	Free plan with up to 1,000 contacts and 5,000 sends a month. Crew has a 14 day trial.
Getting started	Free tier
Built for	Product teams that treat email as infrastructure and want API and webhook control
Company	Not published
Last verified	October 2026

Notification Harbor pricing and plans

Plan	Price	What it includes	What that works out at
Starter	0 USD, free forever	Up to 1,000 contacts, 5,000 sends a month, plain-English campaigns, real-time personalisation, API and webhooks, one sending domain, community support
Crew (14 day trial)	49 USD a month	Up to 25,000 contacts, 200,000 sends a month included, multi-variant testing, send-time intelligence, CRM sync, up to 5 sending domains, custom DKIM and return-path, Slack and email support, SOC 2 audit trail	49 / 200,000 sends = about 0.245 USD per 1,000 sends inside the allowance. Beyond it, 0.40 USD per 1,000. Worked example from the page: 245,000 sends = 49 + (45,000 x 0.40 / 1,000 = 18) = 67 USD a month.
Fleet	Custom	Unlimited contacts, volume pricing per million sends from 1M sends a month, single-tenant deployment, dedicated IPs and automated warmup, custom retention and DPA, 24/7 support with a named CSM, 99.99% SLA

The pricing page counts a send as one email to one recipient: a 5,000-person newsletter is 5,000 sends, and a trigger that fires for 200 users is 200 sends.
Contacts are not billed per stored record, but Crew caps them at 25,000 and Starter at 1,000.
Dedicated IPs and automated warmup are listed only on Fleet.
Fleet is an annual prepaid contract, and onboarding is included with no setup fee.

Billing is by sends, not stored contacts. A send is one outbound email to one recipient, and retries on temporary bounces do not count. Crew includes 200,000 sends a month and charges 0.40 USD per 1,000 above that. Fleet is an annual prepaid contract with onboarding included. Downgrades mid-cycle are pro-rated on the next bill.

Notification Harbor features: what it does

Plain-English campaign briefs produce 3 to 5 subject lines, a preheader and per-segment body variants for side-by-side review
Personalisation at queue time varies subject line, hero copy, CTA and send time per recipient from engagement history
Every UI action has a REST and webhook equivalent, with SDKs for Node, Python, Go, Rust and Elixir
Bidirectional sync with HubSpot, Salesforce, Attio and custom Postgres, with send traces routable to Datadog, Honeycomb or Grafana
A campaign rehearses on a 1% test slice and checks inbox placement before the full rollout

Notification Harbor limitations

Starter is capped at 1,000 contacts, 5,000 sends a month and one sending domain.
Multi-variant testing, send-time intelligence and CRM sync are listed on Crew and not in Starter's feature list.
Crew caps contacts at 25,000 and includes 200,000 sends, with sends above that billed at 0.40 USD per 1,000.
Fleet pricing is not published beyond volume pricing per million sends, from 1M sends a month, on an annual prepaid contract.
The homepage states there is no drag-and-drop editor and no templates.

Who Notification Harbor is for

Your situation	What that means here
Solo founder with a small list	Starter is free up to 1,000 contacts and 5,000 sends a month, with API access and one sending domain.
Product team sending behavioural email	Crew includes 200,000 sends and 25,000 contacts at 49 USD a month, with 0.40 USD per 1,000 sends beyond that.
Marketer who wants a visual template editor	The homepage states there is no drag-and-drop and no templates, with campaigns written in English.
Team with a CRM as source of truth	Crew lists bidirectional CRM sync, with HubSpot, Salesforce, Attio and custom Postgres named on the homepage.
Sender with a very large list	Contacts are not billed per record, but Crew caps them at 25,000, and Fleet is quoted per million sends.
Brand needing dedicated IPs	Dedicated IPs with automated warmup are listed on Fleet only.

Notification Harbor use cases for marketers

Product-update and behavioural email where subject line, copy and send time differ per recipient based on engagement history.
Briefing a campaign in plain English, reviewing generated variants, and rolling out on a test slice before the full send.

Notification Harbor performance claims, checked

The homepage shows counters for higher click-through versus static blasts, from idea to first send, and average inbox placement, but the crawled text shows no values. It also says deployment was timed 12,000 times, with no method or baseline given.

Notification Harbor FAQ

Does Notification Harbor charge per contact?

No. Billing is by sends, one per outbound email per recipient. Contacts are still capped per plan: 1,000 on Starter and 25,000 on Crew.

What happens above 200,000 sends on Crew?

Additional sends are charged at 0.40 USD per 1,000. The pricing page's example of 245,000 sends totals 67 USD a month.

Is there a trial?

Starter is free with no stated end. Crew shows a 14 day trial. Fleet is sold through sales.

Notification Harbor sources and references

The Notification Harbor pricing page lists Starter at 0 USD forever with up to 1,000 contacts, 5,000 sends a month and one sending domain; Crew at 49 USD a month with up to 25,000 contacts, 200,000 sends a month included, 0.40 USD per 1,000 sends thereafter, up to 5 sending domains and a 14-day trial; and Fleet at custom pricing from 1M sends a month with unlimited contacts, single-tenant deployment, dedicated IPs, a 99.99% SLA and 24/7 support. It states that billing is by sends rather than contacts, with a 5,000-person newsletter counting as 5,000 sends, and gives a 245,000 send example costing 49 USD plus 45,000 overage sends at 0.40 USD per 1,000, a total of 67 USD a month.notificationharbor.com Accessed 2026-10-21
The Notification Harbor homepage describes writing a campaign brief in plain English and receiving 3 to 5 subject lines, a preheader and per-segment variants, personalisation per recipient at queue time using engagement history, a rehearsal of the send on a 1% test slice, REST and webhook equivalents for every UI action with SDKs in Node, Python, Go, Rust and Elixir, bidirectional sync with HubSpot, Salesforce, Attio and custom Postgres, and traces into Datadog, Honeycomb or Grafana. It states there is no drag-and-drop and no templates.notificationharbor.com Accessed 2026-10-21

Compiled by Alston Antony from the sources above:how we compile these entries and ouraffiliate disclosure.