Cleverdeck

CleverDeck is a spaced-repetition flashcard application for iOS, built by an independent developer to help people learn and retain vocabulary and other material more efficiently. It ships hand-made premium decks covering roughly the 3,000 most common words in major foreign languages — Spanish, French, German, Chinese, Japanese, Arabic, Italian, Portuguese, Turkish, Persian, Russian and advanced English — with translations, transliterations, images, native-speaker audio, and example sentences in both English and the target language. The app uses the SM-2 spaced-repetition algorithm (as popularized by SuperMemo and Anki) with a customizable learning schedule, cross-device sync, and full offline support. It is free to create and study your own content, with unlimited access to the premium decks for $3 per month. CleverDeck is a consumer mobile product and publishes no public API, SDK, developer portal, or agent-facing surface.

Cleverdeck is profiled on the APIs.io network. Tagged areas include Company, Education, Language Learning, Flashcards, and Spaced Repetition.

Cleverdeck’s developer surface includes documentation, support, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

11.8/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

Company Education Language Learning Flashcards Spaced Repetition EdTech iOS Mobile App Vocabulary

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 11.8/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 3.9 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Regulatory Posture applies to this provider. Its tags matched the Education & Research regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/cleverdeck: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Download

Download

Source (apis.yml)

aid: cleverdeck
name: Cleverdeck
description: CleverDeck is a spaced-repetition flashcard application for iOS, built by an independent developer to help people
  learn and retain vocabulary and other material more efficiently. It ships hand-made premium decks covering roughly the 3,000
  most common words in major foreign languages — Spanish, French, German, Chinese, Japanese, Arabic, Italian, Portuguese,
  Turkish, Persian, Russian and advanced English — with translations, transliterations, images, native-speaker audio, and
  example sentences in both English and the target language. The app uses the SM-2 spaced-repetition algorithm (as popularized
  by SuperMemo and Anki) with a customizable learning schedule, cross-device sync, and full offline support. It is free to
  create and study your own content, with unlimited access to the premium decks for $3 per month. CleverDeck is a consumer
  mobile product and publishes no public API, SDK, developer portal, or agent-facing surface.
url: https://raw.githubusercontent.com/api-evangelist/cleverdeck/refs/heads/main/apis.yml
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://s3.amazonaws.com/cleverdecksite/images/favicons/favicon-192.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-enrichment-note: Consumer iOS spaced-repetition flashcard app by a solo developer. No public API, OpenAPI/spec, SDK, well-known,
  security.txt, or llms.txt surface exists (probed 2026-07-18). Enrichment limited to identity hygiene, real published link-properties,
  and a domain-security probe.
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Education
- Language Learning
- Flashcards
- Spaced Repetition
- EdTech
- iOS
- Mobile App
- Vocabulary
apis: []
common:
- type: DomainSecurity
  url: security/cleverdeck-domain-security.yml
- type: Website
  url: https://cleverdeck.com/
  name: CleverDeck Website
- type: Documentation
  url: https://cleverdeck.com/manual/
  name: CleverDeck Manual
- type: TermsOfService
  url: https://cleverdeck.com/tos/
  name: Terms of Service
- type: PrivacyPolicy
  url: https://cleverdeck.com/privacy/
  name: Privacy Policy
- type: Support
  url: mailto:justin@cleverdeck.com
  name: Support Email
- type: X
  url: https://twitter.com/clever_deck
  name: CleverDeck on X
- type: Download
  url: https://itunes.apple.com/us/app/cleverdeck-spaced-repetition-flashcards/id881765907
  name: Download on the App Store
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