# 6 Wunderkinder

**Canonical:** https://apis.io/providers/6-wunderkinder/  
**APIs profiled:** 0

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.

## Kin Score — 5.0 / 100 (minimal)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 5.0).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Tags

Company, Productivity, Task Management, To-Do, Berlin, Germany, Defunct, Acquired

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/6-wunderkinder/). Scores are computed from the provider's own public artifacts under a published rubric.