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VocabSpaced

SM-2 spaced-repetition scheduling for any vocabulary or term/definition list

Unify Dynamics LLC

Documentation
Tools6read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

I got 'ephemeral' right just now, when should it come back?
Tools called
schedule_review
Add this new vocab word to my review deck
Tools called
new_item
Reschedule all 12 flashcards from today's session
Tools called
review_batch
Which of these flashcards are due today?
Tools called
due_items
Is this word mastered yet?
Tools called
mastery_level
How does spaced repetition scheduling actually work?
Tools called
algorithm_explainer

About

VocabSpaced computes spaced-repetition scheduling for any vocabulary or term/definition list — languages, technical terms, exam prep, anything — for teens through adult learners. It implements SM-2, the documented SuperMemo-2 algorithm: an ease factor that rises on confident correct recall and falls on a weak or failed one, with intervals that grow 1 day, then 6 days, then previous-interval-times-ease-factor on each further success, and reset to 1 day on any failure. new_item creates a brand-new item's starting state. schedule_review grades one review (0-5 quality) and returns the updated ease factor, interval, repetition count and next review date. review_batch grades a whole session in one call. due_items splits a list of scheduled items into due (most-overdue first) and not-yet-due. mastery_level classifies a card as new, learning, young or mature. algorithm_explainer lays out the exact formula. Stateless: nothing is stored between calls, so you (or your assistant) hold each item's scheduling state and pass it back in. Keyless; fully local; zero upstream calls.

Sources: Computed locally / hand-curated: the SM-2 spaced-repetition algorithm implemented from its documented specification; fully local, zero upstream calls

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

6 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Scheduling3 tools
  • New itemThe starting SM-2 scheduling state for a brand-new term/definition pair (no reviews yet).
  • Schedule reviewGrade one SM-2 review and return the updated ease factor, interval, repetition count and next review date.
  • Review batchGrade a whole review session (a list of items) in one call.
Review queue2 tools
  • Due itemsSplit a list of scheduled items into due (ranked most-overdue first) and not-yet-due.
  • Mastery levelClassify a card's maturity band (new/learning/young/mature) from its interval and repetition count.
Reference1 tools
  • Algorithm explainerExplain the SM-2 spaced-repetition algorithm this connector implements: the quality scale, the ease-factor formula and the interval rule.

Information

PublisherUnify Dynamics LLC
CategoryEducation & reference
LanguagesEnglish
Built forGlobal
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://vocabspaced.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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About VocabSpaced

VocabSpaced is a spaced-repetition scheduler for any vocabulary or term/definition list — languages, technical terms, exam prep, anything you're memorizing. It is built for teens through adult learners, not a kids' tool.

It implements SM-2, the well-documented SuperMemo-2 algorithm published by Piotr Wozniak in 1987, the ancestor of the scheduling logic in most modern spaced-repetition apps. Given an item's current state — ease factor, interval, repetition count — and a 0-5 grade for how well you recalled it, VocabSpaced computes the updated ease factor, the next interval, and the exact next-review date.

  • new_item creates the starting scheduling state for a brand-new term/definition pair.
  • schedule_review grades one review and returns the updated ease factor, interval, repetition count and next review date.
  • review_batch grades a whole session's worth of items in one call.
  • due_items takes a list of scheduled items and tells you which are due today, most-overdue first.
  • mastery_level classifies a card as new, learning, young or mature from its interval and repetition count.
  • algorithm_explainer explains exactly how the SM-2 math works — the quality scale, the ease-factor formula, the interval rule.

VocabSpaced is stateless. It does not store your vocabulary list or your review history between calls. You (or the assistant calling it on your behalf) keep each item's scheduling state and pass it back in on the next review — the same way any spaced-repetition app tracks its own deck, except the scheduling math itself runs here.

This is a scheduling calculator, not a flashcard app or a specific exam's official study tool — it has no affiliation with any test, course or publisher.

Built and maintained by Unify Dynamics LLC. Contact: agent@connectorbay.com.

Privacy policy

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VocabSpaced — Privacy Policy

Effective 28 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What VocabSpaced is. VocabSpaced is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf to compute spaced-repetition scheduling: given a vocabulary term, its definition, a recall-quality grade, and the item's current scheduling state, it returns the updated ease factor, interval and next review date. You interact with your assistant; the assistant sends us only the values needed for that one calculation.

What we receive. The arguments of each tool call — a term and definition, a recall-quality grade, an ease factor/interval/repetition count you supply, and an optional review date — plus the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one), and standard server logs.

Everything is computed on our server and nothing is stored. Every response is derived purely from the arguments of that one call using the SM-2 formula; no vocabulary list, review history or scheduling state is retained after the response is sent, no request is forwarded to any third party, and nothing is used to train anything. If you want your review history kept, that is your (or your assistant's) responsibility — VocabSpaced has no database of its own.

What we do not receive or store. We do not receive your conversation with the assistant, an account, a login, or any identifying information beyond the technical request metadata above, and we do not build a learning profile from queries: each call is answered independently. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs, which contain IP addresses and request paths but not request bodies, are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — every tool is computed locally. Hosting: Vercel (United States regions).

Legal bases and your rights. For users in California, the EU/UK and elsewhere, our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information.

Changes. We will post changes here with a new effective date.

Terms of service

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VocabSpaced — Terms of Service

Effective 28 September 2026. These terms govern use of the VocabSpaced connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. VocabSpaced computes spaced-repetition scheduling (the SM-2 algorithm) for vocabulary or any term/definition list you supply, from formulas bundled with the server. It is accessed through an AI assistant or directly over MCP or HTTP.
  2. A scheduling calculator, not a study product. VocabSpaced computes ease factors, intervals and due dates from the state and grades you provide. It is unofficial, general-purpose study tooling — not affiliated with, endorsed by, or a substitute for any specific exam, course, curriculum or commercial flashcard product. It does not store your vocabulary or review history; any results reported (mastery levels, due-item lists) are only as accurate as the state you supply it.
  3. Your data, your responsibility. Because the Service is stateless, you (or your assistant) are responsible for persisting each item's scheduling state between calls. We are not responsible for lost review history.
  4. Acceptable use. Automated use within the published rate limits is welcome.
  5. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time.
  6. Data. Our Privacy Policy describes what we process. In short: your query is answered on our server and nothing is stored.
  7. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder and may be revoked for abuse.
  8. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss arising from use of or reliance on the Service. Our total liability is limited to US $100.
  9. Governing law. California law; venue in San Mateo County, California.
  10. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/vocabspaced

Support

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VocabSpaced support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. VocabSpaced never asks for them.

Get VocabSpaced

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://vocabspaced.connectorbay.com/mcp
{
  "mcpServers": {
    "vocabspaced": {
      "type": "http",
      "url": "https://vocabspaced.connectorbay.com/mcp"
    }
  }
}