# FiftyThree

**Canonical:** https://apis.io/providers/fiftythree/  
**APIs profiled:** 0

FiftyThree, Inc. was a New York City-based technology company that built tools for mobile creativity, best known for Paper (Apple's 2012 iPad App of the Year), the Pencil Bluetooth stylus, and Paste, a collaborative presentation tool. The company raised a Series A led by Andreessen Horowitz (a16z) in 2013 and, in July 2014, shipped the FiftyThree SDK so third-party iOS apps such as Procreate and Noteshelf could integrate the Pencil stylus (pairing, palm rejection, surface pressure). FiftyThree's assets and patents were acquired by WeTransfer on August 21, 2018, and the standalone products and developer surface were subsequently wound down. This profile is retained as a historical company record; there is no live public web API, developer portal, or OpenAPI to enrich.

## Kin Score — 5.0 / 100 (minimal)

Scored 2026-08-20 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, Creativity, Design, Mobile, iPad, Stylus, SDK, Acquired, Defunct

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