Jeremiah Say
Software developer and data analyst in Singapore. He edits Numbers.sg and has built seven sites on one rule: show where every fact comes from.
Last updated
Jeremiah Say edits Numbers.sg. He is a software developer and data analyst in Singapore and a former maths tutor. Tutoring is where he learned that most things are only hard until someone breaks them into steps you can follow.
- sites built
- 7
- building since
- 2019
- Numbers.sg updates logged
- 105
- Numbers.sg corrections logged
- 43
The seven sites he has built
Each answers one question, and each follows the same rule as Numbers.sg: show the source. They’re listed oldest first.
Since 2019Quit With Nerd
How do you quit smoking and stay happy about it?
Plain guides and free tools on quitting smoking, with each fact linked to its source.
His personal site, not part of Numbers Publishing.
Start with How to quit smoking: 6 methods compared
Since 2020Gracious Quotes
Who really said that quote?
Checks who said each quote and where. A quote not yet checked says “review pending”.
2,142 quote collections
Listed in LangChain’s tool integrations, checked 29 Oct 2026.
Start with How each quote is sourced
Since 2025GreenCalculus
Where did that carbon number come from?
A database and API of carbon emission factors. Every value comes back with the exact place in the source it was read from.
21,133 emission factors
Cited in Wikipedia’s Kigali Amendment article, checked 29 Oct 2026.
Start with The emission factor database
Since 2026PerBowl
Who really makes your dog or cat food?
Matches pet food brands to state registrations, licensed plants and FDA inspections. It gives no feeding advice.
Since 2026Toggle9
Why pay for a tool that should be free?
Free tools, calculators and printables. The calculators show their working.
256 tools
Product Watch: #1 of the Day on launch, 28 Oct 2026, by users’ upvotes. Checked 3 Nov 2026.
Start with Free coloring pages
Since 2026Numbers.sg
What does Singapore’s money actually pay today?
Rates, CPF and tax figures read from the agency or bank that publishes them, with calculators tested against the official figures.
14 calculators and 65 trackers and guides
Corrections and changes are logged in public.
Start with T-bill rates and auctions
Since 2026Who Actually Makes
Who makes the store brand in your cart?
Traces store brands to the company and factory through public records, with a stamp showing how strong the proof is.
148 maker claims, each tied to a public record
Each answer shows its records and what they can’t prove. How the stamps work.
Start with Who makes Kirkland Signature
Who’s behind them
Numbers Publishing Pte. Ltd.
Six of the seven are published by this Singapore company, which he owns and directs. Quit With Nerd is his personal site.
Counts are each site’s own, read every day, last on , as on the company page. Stories and outside mentions were checked on 5 Nov 2026.
What he does here
- Collects. He writes and runs the jobs that read each number from its source.
- Checks. A bad reading is stopped before it goes up, and the last good number stays.
- Reads by hand. Sources that can’t be read automatically, such as banks’ and lenders’ pages that block automated reads, are read by hand and booked on the update schedule.
- Corrects. He reads every correction report and logs every correction on Corrections.
How his sums are tested
He builds the calculators and tests each one against the figures the agency publishes, every time the page is built. Each calculator shows how many it matches.
| Calculator | Tested against |
|---|---|
| T-bill calculator | MAS’s price for every auction since 1987 |
| CPF calculator and CPF LIFE calculator | CPF Board’s worked examples and published figures |
| Income tax calculator and stamp duty calculator | IRAS’s worked examples and rate tables |
| Take-home pay calculator | CPF Board’s contribution figures and IRAS’s rate table |
| PARF rebate calculator | LTA’s worked examples |
Disclosure of interests
Written so you can weigh what you read here. Last reviewed on 5 November 2026.
| What he holds | Accounts with MariBank, moomoo and Singlife, which appear on our money market funds page. |
|---|---|
| Who pays him | No bank, lender, loan broker or agency pays him for what a page says. Numbers.sg’s Referral Codes pages carry codes from his own accounts, which can earn rewards; each is labelled on its page. His other sites earn in their own ways, and each says how. |
| What he isn’t | A licensed financial adviser. Nothing on this site is advice on what to buy. |
If any of this changes, this list will be updated and the change logged on What’s new.
Profiles
Records outside these sites, so you can check who he is without taking our word for it.
- LinkedIn: Work history
- GitHub: Code and commit history
- ORCID: Researcher ID
- Wikidata: Public entity record
Questions
Who is Jeremiah Say?
A software developer and data analyst in Singapore. He edits Numbers.sg and is the director and only shareholder of Numbers Publishing Pte. Ltd.
What sites does Jeremiah Say run?
Numbers.sg, GreenCalculus, Gracious Quotes, PerBowl, Toggle9 and Who Actually Makes, published by Numbers Publishing, and Quit With Nerd, his personal site. See each one.
Is he a financial adviser?
No. He holds no licence to give financial advice. Numbers.sg shows published rates and works out sums from them. See the disclaimer.
Does a bank pay him?
No. His disclosure lists what he holds and who pays him.
Contact
Email hello@numbers.sg or use the Contact page. Reports of a wrong number are read first.