aid: 6-wunderkinder
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/6-wunderkinder.png
name: 6 Wunderkinder
description: 6 Wunderkinder (6Wunderkinder GmbH) was a Berlin-based software startup founded in 2010 that built Wunderlist, a popular cross-platform to-do list and task management application. The company shipped a public REST API for Wunderlist in 2013, along with webhooks and integrations such as Slack and Sunrise, and rebuilt its backend into roughly 60 microservices behind a single unified API. Backed by Earlybird and Sequoia Capital, 6 Wunderkinder was acquired by Microsoft in June 2015 for a reported US$100-200M. Microsoft folded the product into Microsoft To Do and discontinued Wunderlist on 6 May 2020. This profile is retained as a historical record; the company is defunct and publishes no live API, developer portal, or documentation.
url: https://raw.githubusercontent.com/api-evangelist/6-wunderkinder/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- earlybird
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-detail: Acquired by Microsoft June 2015; Wunderlist discontinued 6 May 2020; all domains (6wunderkinder.com, wunderlist.com, developer.wunderlist.com) return no response (HTTP 000).
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Productivity
- Task Management
- To-Do
- Berlin
- Germany
- Defunct
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence