Tools and research

Start with what you can use now.

Free DOR search, the exemptions library, briefs, and a free initial answer, with no account needed. Research assistants and tool previews follow.

Use now · no account needed

Free for anyone, right now

Search the Department of Revenue site, browse the exemptions library, read the briefs, or send one question for a free initial answer.

Doris: search the DOR website

Ask in plain English and get pointed to the right Washington Department of Revenue page. Free, no account needed.

Search DOR

Exemptions & deductions library

Browse Washington tax preferences with RCW citations, study data, and flags for areas 2025-26 legislation may affect.

Browse the library

Hot topics and briefs

Plain-English briefs on recent Washington tax changes, with links to the primary sources.

Read the briefs

Updates and legislation

Articles, Department of Revenue guidance changes, and the Washington tax bills we track.

See updates

Free initial answer

One WA tax question, one entity, one period. Free initial answer, a person reviews, reply when capacity allows.

Ask your free question How the free answer works

01 · Assistants

AI Research Assistants

Conversational research with citations to the RCW, WAC, ETAs, and DOR guidance. Doris is open to everyone; the others start with a short guest trial. Choose how to research below.

What you get

Guest: 3 total trial questions on our keys, shared across Delphi, Solomon, Scout and Oikos and your internet connection. No account or API key needed; no monthly reset.
Free account: Keep researching with your own Anthropic or OpenAI API key, and use the ten workspace tools, uploads and saved work (the tools' AI steps need your own Anthropic key). Your provider bills the usage; creating the account is free.
By invitation: Research assistants and the tools' AI steps run on our keys. This access is by invitation only; signing up creates a free account.

Doris is public without an account or API key. Research remains subject to usage limits.

Free account

Delphi

Washington tax research

Broad WA tax research across classifications, exemptions, nexus, refunds, audits, and compliance — every answer cited.

3-question trial · account + key after

Open public tool

Free account

Solomon

Apportionment specialist

Receipts attribution, benefit of the service, the Rule 19402 cascade, throw-out income, and apportionment analysis.

3-question trial · account + key after

Open public tool

Free account

Scout

Refund opportunity scout

Company-specific scans for Washington refund opportunities — exemptions, exclusions, and 2026 law changes, ranked by likelihood.

3-question trial · account + key after

Open public tool

Free account

Oikos

REET specialist

Real estate excise tax research for sales, consideration, exemptions, 1031 exchanges, affidavits, and refund procedure.

3-question trial · account + key after

Open public tool

Use now, no account

Doris

DOR website search

Natural-language search of the official Washington DOR site (and five western-state pilots) to find the right agency page.

Free · no API key needed

Open public tool

02 · Signed-in workspace

Tool previews

Previews of the ten tools in the signed-in workspace. Each page shows what the tool analyzes and produces. Previews don't ask questions, accept documents, or calculate a personalized result; the working tools need sign-in.

Tool preview

Tax Rate & Location Code Finder

Find current Washington DOR sales/use tax rates and location codes by address, then save the lookup with your work.