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

13.6/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyEducationLanguage LearningFlashcardsSpaced RepetitionEdTechiOSMobile AppVocabulary

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 13.6/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 2.6 / 20

Commercial Clarity 4.2 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

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: '0.20'
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