Jeremiah Say

Independent builder in Singapore. Sourced data you can check: greencalculus.com (carbon factors), graciousquotes.com (quotes), perbowl.com (pet food), toggle9.com (calculators).

Singapore Joined on May 10, 2026 https://greencalculus.com

Education

Singapore Institute of Technology

Work

Founder · GreenCalculus, GraciousQuotes, PerBowl, Toggle9

Jeremiah Say

Oct 26

I audited every network request on 200 tool pages. Here's what "runs in your browser" actually means

#privacy #webdev #javascript #testing

6 min read

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Jeremiah Say

Oct 22

Your AI agent will credit famous quotes to the wrong person. Here's a LangChain tool that checks them

#langchain #python #ai #llm

7 min read

Jeremiah Say

Oct 16

4.2 / 0.6 = 7.000000000000001: testing calculator formulas against hand-worked examples

#javascript #testing #webdev #math

4 min read

Jeremiah Say

Oct 16

Parsing 12' 6" and 2.4 m: measurement input that doesn't annoy people

#javascript #parsing #ux #webdev

5 min read

Jeremiah Say

Oct 16

Is senior cat food lower in calories? I paired 18 senior foods with their adult twins to check

#python #datascience #algorithms #data

6 min read

Jeremiah Say

Oct 9

FDA now classifies pet food recalls 4.7x faster than before 2020. Here's the 40-line check, and the trap in it

#python #opendata #datascience #data

6 min read

Jeremiah Say

Oct 8

Who said this quote? Matching misremembered quotes when people never type them right

#php #mysql #search #algorithms

4 min read

Jeremiah Say

Oct 8

Same-day pet food recall alerts from one FDA JSON file and a cron job

#php #wordpress #opendata #cron

4 min read

Jeremiah Say

Oct 8

A fair Secret Santa draw with exclusions is a matching problem

#javascript #algorithms #math #webdev

5 min read

Jeremiah Say

Jun 12

Summing 50,000 emission line items in the wrong order changes your total

#javascript #webdev #programming #carbon

4 min read

Jeremiah Say

Jun 3

I Built a Carbon Calculator Where the Emission Factor Doesn't Exist

#showdev #javascript #webdev #datascience

4 min read

Jeremiah Say

May 29

The "Audit Trail" Pattern: Architecture for Immutable Sustainability Data

#webdev #architecture #sustainability #database

3 min read

Jeremiah Say

May 23

Floating-point will quietly corrupt your emissions math, and 0.1 + 0.2 already warned you

#javascript #programming #math #carbon

6 min read

Jeremiah Say

May 11

CSRD/ESRS E1 disclosure requirements, translated into data fields — a developer's map

#javascript #sustainability #php #carbon

7 min read

Jeremiah Say

May 11

Building a SHA-256 audit trail for emission factor provenance in WordPress

#php #sustainability #wordpress #carbon

6 min read

Jeremiah Say

May 11

How to build a grid emission factor lookup in Vanilla JS using IEA 2026 regional data

#javascript #sustainability #webdev #carbon

5 min read

Jeremiah Say

May 10

Building a zero-dependency carbon calculator platform — architecture decisions and why I rejected every framework

#javascript #webdev #sustainability #css

4 min read

Jeremiah Say

May 10

Why most carbon calculators are using the wrong methane GWP value (and how to fix it)

#sustainability #javascript #opensource #carbon

2 min read

DEV Community

Jeremiah Say

Skills/Languages

Currently learning

Currently hacking on

Available for

I audited every network request on 200 tool pages. Here's what "runs in your browser" actually means

Want to connect with Jeremiah Say?

Your AI agent will credit famous quotes to the wrong person. Here's a LangChain tool that checks them

4.2 / 0.6 = 7.000000000000001: testing calculator formulas against hand-worked examples

Parsing 12' 6" and 2.4 m: measurement input that doesn't annoy people

Is senior cat food lower in calories? I paired 18 senior foods with their adult twins to check

FDA now classifies pet food recalls 4.7x faster than before 2020. Here's the 40-line check, and the trap in it

Who said this quote? Matching misremembered quotes when people never type them right

Same-day pet food recall alerts from one FDA JSON file and a cron job

A fair Secret Santa draw with exclusions is a matching problem

Summing 50,000 emission line items in the wrong order changes your total

I Built a Carbon Calculator Where the Emission Factor Doesn't Exist

The "Audit Trail" Pattern: Architecture for Immutable Sustainability Data

Floating-point will quietly corrupt your emissions math, and 0.1 + 0.2 already warned you

CSRD/ESRS E1 disclosure requirements, translated into data fields — a developer's map

Building a SHA-256 audit trail for emission factor provenance in WordPress

How to build a grid emission factor lookup in Vanilla JS using IEA 2026 regional data

Building a zero-dependency carbon calculator platform — architecture decisions and why I rejected every framework

Why most carbon calculators are using the wrong methane GWP value (and how to fix it)