Knowify API Guide for Contractors

One-line verdict: A real API key exists — on the higher plans — but Knowify’s own help center documents it as a Zapier key, not a wide-open developer door. Openness: 3 / 5 — rated 3 because the vendor documents an admin-generated API key gated to Growth or Enterprise subscriptions, while endpoint-level direct API access is not verified from Knowify’s own help or site.

The connection that works

Rung 1 — Direct connection, narrowly documented. Knowify’s help center documents the credential: with admin privileges, you generate an API Key in the Admin section (Integrations → API Key → Generate API Key). The plan gate is stated in the same help article: to integrate Knowify with the outside, “you’ll need to be in a Growth or Enterprise level subscription.” The help article carrying those plan names is older, so treat the exact current plan mapping as worth one confirmation with Knowify — the gate itself is vendor-documented.

Here is where this page earns its keep: the object-level surface Knowify’s help center actually documents for that key is the Zapier trigger and action set (next rung). Endpoint-by-endpoint direct API access — read this object, write that one — is not documented in the vendor help or site pages we read. A separate developer site on a Knowify subdomain describes a much broader v2 REST/OAuth API, but that site contradicts itself — it calls its own hostnames placeholders and lists a localhost address as the local API — and no Knowify help or pricing page links to it. Under this directory’s standard, those broader claims stay UNVERIFIED until Knowify’s main documentation confirms them. They are listed below so nobody sells them to you as fact.

Bridge apps: the bridge is the documented road. Knowify’s own help center lists the Zapier surface the API Key unlocks — triggers: New Project, New Client, New Ticket, New Invoice, New Purchase, New Payment, New Task, New AIA Invoice, New Bill; actions: Add Product, Add Client, Add Vendor, Add Task. Zapier’s own listing shows a wider, newer polling-trigger set (including Updated Invoice, Job Closed, Change Order Made Active, Time Entry Approved) — bridge evidence, labeled as such; the two lists don’t match, and the vendor’s list governs what we call verified. No Make app was found.

Separately, Knowify’s headline native connection is its two-way QuickBooks Online sync — customers, vendors, purchases, expenses, invoices, time, and projects — a vendor-built sync, not API access.

Can automate

• Event-driven follow-up through Zapier — a new project, client, invoice, or payment in Knowify can start work in your other tools (the vendor-documented trigger list), on Growth or Enterprise.
• Records pushed in — clients, vendors, products, and tasks can be added from connected tools through the documented actions.
• Books in sync — the native QuickBooks sync keeps invoices, expenses, time, and projects aligned without re-typing.

Can’t automate

• Endpoint-level direct API access — UNVERIFIED. The broader v2 REST/OAuth API described on the Knowify subdomain (OAuth flows, token lifetimes, project/invoice/time-entry endpoints, an MCP server, a 120-requests-per-minute rate limit) is UNVERIFIED: the site undermines its own credibility and Knowify’s main help center doesn’t confirm it.
• Estimates through any connection — UNVERIFIED. Estimates don’t appear even in the vendor’s Zapier trigger/action list.
• Webhooks — none are documented in the vendor help articles we read; Zapier triggers are the event path, and they poll.
• Anything on a lower plan — the API Key is documented as a Growth/Enterprise feature.
• Make automations — no Knowify app was found on Make.

Hidden gate: No Growth or Enterprise plan, no API key — and the key an admin hands you is documented for Zapier, not for a wide-open direct connection. If a builder quotes you a custom Knowify API integration, ask which Knowify page documents the endpoints. This one couldn’t find them.

Build fit — what this platform supports well

• Speed-to-Lead — workable through the bridge: a new client or project fires follow-up, and new clients can be pushed in.
• Invoice Chase / AR — the trigger side is real (New Invoice, New Payment are vendor-documented Zapier triggers), so the chase can react to billing events; the messages run on our layer.
• Estimate Follow-Up — weak: no estimate trigger or endpoint is documented anywhere in the vendor material.
• Review Engine — like every platform here, Knowify has no verified reviews API, so the review ask runs on our system triggered by a job-completion signal — a closed job event through the bridge can supply it.

What this means for your shop

If you run Knowify on Growth or Enterprise, you have a working bridge and a sync that keeps your books honest — enough for event-driven follow-up and record-keeping automation today. What you don’t have, on Knowify’s own published evidence, is a documented direct API a builder can scope against. Keep the distinction and you’ll never pay direct-API prices for bridge-grade connections.