Trello API
Trello's REST API is fully self-serve: any user generates an API key and token in seconds, with no partner approval or security review. Webhooks are free and unlimited with retries. Third-party OAuth is still 1.0a, and limits of 300 requests per 10 seconds per key bite at scale.
Frequently asked questions
Trello scores A on the API Report Card. Trello's REST API is fully self-serve: any user generates an API key and token in seconds, with no partner approval or security review. Webhooks are free and unlimited with retries. Third-party OAuth is still 1.0a, and limits of 300 requests per 10 seconds per key bite at scale.
Trello has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
Trello is a cloud-based visual project management and collaboration platform built around the Kanban board metaphor, workspaces contain boards, boards contain lists, and lists contain cards that users drag between columns to represent work in flight.
Vertical: Horizontal Kanban / visual project management / team collaboration (not industry-specific, sits in the broader work management category alongside Asana, Monday, ClickUp, Jira). Individual contributors, project leads, marketing managers, product managers, and small-team operators create a Workspace, spin up Boards (one per project, team, or topic), define Lists representing workflow stages (commonly Backlog / To Do / Doing / Done, plus variants like 'In Review' or 'Blocked'), and add Cards for individual units of work.
Trello is one of the most recognized SaaS brands in the world for visual project management and is the de facto entry point for Kanban for most knowledge workers.
Partially, Trello often holds the canonical Kanban representation of operational work for the teams that use it, but rarely the system-of-record financial or transactional data of the broader business.
Founded 2011 inside Fog Creek Software (Joel Spolsky, Michael Pryor), spun out as Trello Inc. in 2014, acquired by Atlassian in January 2017 for $425M.
Rate limits (300 req/10s per key, 100 req/10s per token) bite at enterprise scale; bulk operations on large boards hit 429 errors quickly. /members endpoints have stricter, undocumented-by-default rate limits that throttle even modest user-directory sync workloads. Full sourced list under Sources below.
Common alternatives include Asana, Monday.com, Atlassian Jira, ClickUp, Notion, Microsoft Planner / To Do / Loop. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.