Find the feature behind the footprint.

Estimated carbon and energy for every feature you ship, next to the calls behind it.

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Why carbon

Your dashboards show how fast, how often and how broken. Not how much carbon.

Every block is one feature.

Together they make up 100% of the app's estimated CO₂e: 18.6 kg in the last 30 days.

Image upload: 2% of calls, 13% of the carbon.

Example dataAcme Shop · Production · Last 30 days

38%Product searchsearch-query
24%Feed renderingfeed-render
17%Checkoutcheckout-flow
13%Image uploadimage-upload
8%14 other featuresall others

Example data: share of estimated CO2e by feature, Acme Shop · Production · Last 30 days
Feature	Share of app total	Est. CO2e	Calls	Share of calls
Product search	38%	7.07 kg	4.1M	45%
Feed rendering	24%	4.46 kg	2.9M	32%
Checkout	17%	3.16 kg	380k	4%
Image upload	13%	2.42 kg	210k	2%
14 other features	8%	1.49 kg	1.6M	17%
Whole app	100%	18.6 kg	9.19M	100%

The missing column

The column your monitoring never had.

Codensity doesn't replace the monitoring you already have. It adds the column it never had: estimated carbon, attributed to the features your team recognizes.

Example dataAcme Shop · Production · Last 30 days

Feature	Calls	p95 latency	Error rate	Est. CO₂e
	What your monitoring already shows			What Codensity adds
Product search`search-query`	4.1M	180 ms	0.2%	7.07 kg
Feed rendering`feed-render`	2.9M	240 ms	0.4%	4.46 kg
Checkout`checkout-flow`	380k	620 ms	0.9%	3.16 kg
Image upload`image-upload`	210k	1.4 s	0.3%	2.42 kg

Latency and error rates stand in for the tools you already run. Codensity's SDK measures each feature as it runs and estimates the energy and carbon behind it.

How it works

Three steps from function to footprint.

Wrap it.

Install @codensity/node and wrap the work you care about. Your function's return value passes through unchanged, and events are batched in the background.

checkout.ts

import { CodensityClient } from "@codensity/node";

const codensity = new CodensityClient({
  key: process.env.CODENSITY_KEY,
  environment: "production",
});

export async function checkoutFlow(cart) {
  return codensity.track("checkout-flow", () => processCart(cart));
}

02
It shows up.
The first event creates the feature for you, with a readable name taken from its key.
Your code sendstrack("checkout-flow", …)
Codensity creates
FeaturesAcme Shop · Production
Product searchsearch-queryActive
Feed renderingfeed-renderActive
Checkout Flowcheckout-flowNew
03
Watch it over time.
Every feature gets its calls, energy and carbon estimates by day, so a change in the line has a name attached.
Checkout · est. g CO₂e per dayExample data
30 days agoToday

In the product today

Built around your features.

Rankings

See which features carry the most carbon.

1Product search7.07 kg
2Feed rendering4.46 kg
3Checkout3.16 kg
4Image upload2.42 kg

Est. CO₂e · last 30 days

Dormant features

Spot the features nobody calls anymore.

legacy-exportNo telemetry in 30 days
promo-banner-v1No telemetry in 30 days

Candidates to archive, or code to remove.

Structure

Projects, environments, features.

Acme Shop
- Production
  - search-query
  - checkout-flow
  - image-upload
- Staging

Plain units

Every unit, explained where it appears.

g CO₂e: Grams of carbon dioxide equivalent: the warming impact of different greenhouse gases expressed as one number.
kWh: Kilowatt-hours of energy used to do the work.
est.: Carbon and energy figures are estimates, and the product labels them that way.

Integrations

Node.js today, with Express and NestJS helpers.

@codensity/node
Express
NestJS

Coming soon

Next: a carbon budget for every feature, and a verdict for every release.

We're building budgets you can set per feature and comparisons between releases.

Release checkPreview

$ codensity check --release v2.9 --against v2.8  Checking 5 features in northwind-shop (production)   feature            g / 1k calls   budget   change  search-query               1.54     2.00    -6.3%   ok  feed-render                1.72     2.00    -0.6%   ok  checkout-flow              8.77    10.00    -2.1%   ok  image-upload              12.23    11.00   +19.7%   over budget  recommendations            1.11     1.50    +0.9%   ok   Verdict: 1 feature over its release budget (image-upload).

Planned for CI. Not available yet.

Pricing

Start free. Pay when every feature counts.

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Free

5M events a month, one project and 7 days of history. Enough to find your heaviest feature.

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Team

$79per month

CO₂e for every feature, full history, rankings and comparisons across 5 projects.

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Business and Enterprise

Custom

Higher volumes, unlimited projects, ESG exports and agreements that fit your organisation.

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Wrap one feature. Watch its footprint appear.

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