FiftyThree

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.

FiftyThree is profiled on the APIs.io network. Tagged areas include Company, Creativity, Design, Mobile, and iPad.

📡 Source on GitHub

0 APIs

Company Creativity Design Mobile iPad Stylus SDK Acquired Defunct

Resources

Company 1

The organization behind the API

Press

Press

Other 1

Properties that don't map to a standard resource type

Wikipedia

Wikipedia

Source (apis.yml)

aid: fiftythree
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
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/fiftythree.png
name: FiftyThree
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/fiftythree/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-acquired-by: WeTransfer
x-acquired-date: '2018-08-21'
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Creativity
- Design
- Mobile
- iPad
- Stylus
- SDK
- Acquired
- Defunct
apis: []
common:
- type: Wikipedia
  url: https://en.wikipedia.org/wiki/FiftyThree
- type: Press
  url: http://press.fiftythree.com/
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

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/fiftythree"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/fiftythree/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/fiftythree/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.