How this fits in your toolkit.

Plain-English modules on ISOs, NSOs, RSUs, AMT, taxes, liquidity events, and what happens when someone leaves. Live calculators (options, RSUs, scenario compare, offer compare, dilution and preference scenarios) that take the reader’s own assumptions and show the shape of the outcome. A worked case study that follows one person from grant date through IPO, with a counter-story when the company doesn’t make it. Every module ends with a short list of questions for the reader’s own equity team or CPA.

Tax content is US-focused, dated, and reviewed against current IRS guidance. The methodology page documents what the calculators compute, the post-July-2025 §1202 split, and what the tool intentionally does not model.

• No company-specific data. The tool does not know your 409A, your plan terms, or your equity platform. Your internal docs remain the source of truth.
• No tax filing. The calculators show the shape of the math with the inputs the reader provides. They are illustrations, not returns.
• No state tax modeling. Multi-state RSU sourcing and ISO state allocation are flagged as topics, not computed.
• No negotiation guidance. The acceleration section explains what single trigger and good reason mean so an employee can read their own paperwork. It does not coach the reader on what to ask for.
• No app backend, no logged-in account, no client analytics tags. Vercel sees request-level traffic at the platform layer, the same as for any static site. The Ask tab uses the reader’s own Google AI Studio API key to call Google’s Gemini API directly, with no key or conversation routed through this site.
• No actual AMT owed. The calculators show AMT exposure (the spread that gets added to AMT income); whether AMT triggers depends on the reader’s full tax picture, which the tool does not know.
• No employer withholding, supplemental wage rates, FICA, or payroll mechanics. RSU withholding shows the percentage-of-shares model commonly used; precise dollar-for-dollar withholding behavior depends on your payroll setup.

The Ask tab calls Google’s Gemini API, a third-party AI provider, from the reader’s browser using their own free-tier key. The tool never sees the key or the conversation. Even so, plan documents and grant data leave the reader’s machine and reach Google when uploaded or quoted. Free-tier Gemini may use prompts and responses to improve their models; paid Gemini API tiers do not.

If your company prohibits sending compensation or plan-document data to outside AI services, tell employees to use the Ask tab with generic questions only and skip the plan-document upload. The empty-state copy and the upload UI both surface that warning. The educational tabs (Learn, Vesting, Calculators, Exercise, Glossary) do not call any AI service and are unaffected.

• Your plan document and grant agreements (the source of truth for everything specific).
• Your equity platform (Carta, Pulley, Shareworks, etc.) for actual share counts, exercise dates, and current 409A.
• A CPA who has worked with equity-heavy compensation. The modules and calculators raise the floor on what your employees walk into a CPA meeting knowing.
• Your equity team mailbox. The questions-to-ask card at the end of each module routes specific questions back to you, instead of becoming Slack-DM noise.

The site is open and free. There is nothing to license and no embed required. A direct link works for orientation decks, refresh comms, and Slack DMs. Module pages have stable anchors (e.g. /learn/isos#amt-trap) so you can deep-link to a specific concept.

The source code is open at github.com/arminoorata/equity. If something is wrong, a corrections issue is welcome.

For Slack, an onboarding email, or a refresh-grant comm. Edit to taste.

Heads up that there’s a free, public equity education tool at equity.arminoorata.com that we like for general concepts. It covers ISOs, NSOs, RSUs, AMT, vesting, leaving, and liquidity events, with calculators that take your own numbers. It’s educational, not company policy. Anything specific to our plan, our 409A, or our acceleration terms lives in your grant documents; our equity team is the source of truth. The Ask tab uses third-party AI; only use it if our policy permits, and don’t upload plan documents unless our policy specifically allows that.

The modules are written in first person, in a Total Rewards practitioner’s voice. They name tradeoffs out loud and call AMT a landmine because it is one. The directness is deliberate. This is easiest to share in cultures where employees are trusted with the full tax and liquidity picture.