specification: FinOps Framework
specificationVersion: '1.0'
schema: https://www.finops.org/framework/
provider: Plunk
providerId: plunk
created: '2026-06-20'
modified: '2026-06-20'
reconciled: true
tags:
- Email
- Transactional Email
- Marketing
- Automation
- Open Source
- SaaS
- FinOps
- Cost Management
- FOCUS
description: >-
  FinOps view of Plunk spend. On the hosted cloud, Plunk bills a simple
  usage-based rate of $0.001 per email with no base fee and unlimited contacts;
  the Free Forever tier includes 1,000 emails per month at no cost. The primary
  cost driver is email volume, so the dominant FinOps lever is send efficiency.
  Because Plunk is open-source (AGPL-3.0), an alternative cost model is
  self-hosting, which eliminates Plunk per-email fees and shifts spend to your
  own infrastructure and outbound email provider.
notes: >-
  Cloud rates as published on the Plunk pricing page; self-hosting trades
  per-email fees for infrastructure and SMTP/provider costs. Verify against the
  pricing page during reconciliation.
sources:
- https://www.useplunk.com/pricing
- https://docs.useplunk.com
- https://github.com/useplunk/plunk
- https://focus.finops.org/focus-specification/v1-3/
alignedWith:
  framework: FinOps Foundation Framework
  frameworkUrl: https://www.finops.org/framework/
  dataSpec: FOCUS
  dataSpecVersion: '1.3'
  dataSpecUrl: https://focus.finops.org/focus-specification/v1-3/
publisherName: Plunk
serviceCategory: Email and Messaging
billingModel:
  pricingCategory: Usage-Based
  billingFrequency: Monthly
  billingCurrency: USD
  chargeCategories:
  - Usage
  - Adjustment
focusColumns:
  ServiceName: Plunk
  ServiceCategory: Email and Messaging
  ProviderName: Plunk
  PublisherName: Plunk
  InvoiceIssuerName: Plunk
  BillingCurrency: USD
  ChargeCategory: Usage
  PricingCategory: Usage-Based
meters:
- name: emails_sent
  description: Emails sent through transactional send and campaigns, billed at $0.001 each above the free allowance.
  unit: emails
  aggregation: sum
  dimensions:
  - project
  - type
- name: free_emails
  description: Emails covered by the 1,000-per-month Free Forever allowance, billed at zero.
  unit: emails
  aggregation: sum
  dimensions:
  - project
- name: contacts
  description: Contacts stored in the project; unlimited and not billed.
  unit: contacts
  aggregation: max
  dimensions:
  - project
- name: events_tracked
  description: Contact events published via the track endpoint; not directly billed.
  unit: events
  aggregation: sum
  dimensions:
  - project
principles:
- name: Visibility
  description: Track monthly email volume per project against the free allowance and the $0.001 per-email rate.
- name: Allocation
  description: Use separate projects / API keys per product or environment to attribute email spend to teams.
- name: Optimization
  description: Reduce redundant sends, batch notifications, and prune inactive contacts; for high volume, evaluate self-hosting (AGPL-3.0) to remove per-email fees.
- name: Accountability
  description: Assign an owner per project, review monthly email spend against budget, and decide cloud vs. self-host based on volume.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com