For sustainability directors

The letter your suppliers actually answer.

Buyer questionnaires, the SB 253 Scope 3 cascade, and EU export rules all ask you for data you do not hold — your suppliers do. Generate a professional, regulation-cited request letter in under two minutes.

Generate a letter
How it works
01 Fill 4 fields You, supplier, product, pressure 02 Letter generated Cites the actual rule driving the request 03 Send to supplier Copy, download, or email it to yourself 04 Responses come back Certifications, packaging, emissions, contact 05 Standing assessment YKO turns responses into a scored profile buyers accept 01 Fill 4 fields You, supplier, product, pressure 02 Letter generated Cites the actual rule 03 Send to supplier Copy, download, or email 04 Responses come back Certifications, packaging, emissions 05 Standing assessment YKO scores the responses into a profile buyers accept
You already do this — badly
20–30%
Ad-hoc supplier emails land a 20–30% response rate. The rest go ignored until you chase them.
Same 6
Every buyer asks the same six questions — each in a different format, on a different form.
From scratch
Each questionnaire gets answered from a blank page, because last time’s answers were never kept in one place.
The avalanche
Now
Costco supplier standard
A six-question sustainability framework already reaching 6,000+ suppliers.
2026
EU Empowering Consumers rules
Substantiation rules for environmental claims become binding for EU sales in September 2026.
Phasing in
EU CSRD value-chain reporting
Corporate sustainability reporting expands down the value chain in waves.
2027
SB 253 Scope 3 cascade
Scope 3 disclosure flows down from every >$1B California customer to its suppliers.

Every marker is the same six questions. Answer once. Defend everywhere.

Supplier letter generator

Build your request in under two minutes.

Four fields. A professional letter that cites the rule actually driving your request and asks each supplier for the four things every buyer questionnaire needs.

One quick step for letter two.

Your first letter was free. Add your email to unlock five letters total — enough to cover a full round of suppliers. No spam, no card.

Your letter is ready.
Draft · edit freely

Send it as-is or adjust the wording. When the answers come back, YKO turns them into a scored, standing assessment you can hand to any buyer.

You’ve sent five letters

The answers are about to arrive.

YKO turns supplier responses into a scored, standing assessment you can hand to any buyer — so the next questionnaire is answered in minutes, not weeks.

See Supplier Scan — $499