FlipLetters

FlipLetters is a web app that turns typed text and uploaded images into split‑flap and flip‑dot board animation videos, complete with synthesized mechanical click sound synced to every flip. It runs at app.flipletters.com, ships six board styles (station boards, flip‑dot matrices, color‑flap art boards, a desk marquee, and framed announcement boards), and is built by Terahertz Inc. The service offers free and premium plans, with pricing details on its site.

FlipLetters publishes 7 API contracts indexed on the APIs.io network, including Discovery API, Keys API, Postiz API, and 4 more. Tagged areas include Animation, Web App, Split-Flap, Flip-Dot, and Free.

The FlipLetters catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

FlipLetters’ developer surface includes authentication, documentation, pricing, engineering blog, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.1/100 thin Agent 40/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 2 Agent Skills

Animation Web AppSplit-FlapFlip-DotFree Premium

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 39.1/100 · thin

Contract Quality 12.0 / 21

Developer Ergonomics 4.4 / 17

Access Clarity 8.7 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 40/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →

4 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 25.6 — up to +14.9 composite points Ask about this →
Operational Transparency scores 0.0 — up to +13.0 composite points Ask about this →
Contract Quality scores 56.3 — up to +10.9 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/flipletters-com/apis.yml: open an issue on github.com/api-evangelist/flipletters-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 4

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

FlipLetters API

Cloud render, teams, workspaces, and API keys for FlipLetters.

FlipLetters Discovery API

Spec and docs on flipletters.com

FlipLetters Keys API

Mint/revoke flk_ keys (Firebase session only)

FlipLetters Postiz API

Schedule/draft/post via a connected Postiz

FlipLetters Render API

Cloud MP4 export (scope: render)

FlipLetters Teams API

Shared template library (scope: team)

FlipLetters Workspaces API

Agency projects and Postiz destinations

Scroll for all 7

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

FlipLetters MCP Server

Remote MCP server at app.flipletters.com requiring an API key.

MCP SERVER

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

flipletters-com-manage-keys

AGENT SKILL

flipletters-com-render-job

AGENT SKILL

FlipLetters API pricing

Prices published by FlipLetters, read 2026-11-08 from flipletters.com/pricing.

Plan	Price
Free	$0
Premium	$8.99/month
Studio	$29.99/month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

FlipLetters Plans Pricing

3 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Flipletters Com Context

1 classes · 3 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

FlipLetters API Rules

62 rules · 58 error-severity 2 warn-severity 2 info-severity

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

FlipLetters Authentication

http · 1 scheme

SECURITY

FlipLetters Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

FlipLetters Agentic Access

17 operations · 10 acting · 1 human-in-the-loop

17 operations · 10 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 3

The organization behind the API

Website

Website

Blog

Blog

About

About

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: flipletters-com
name: FlipLetters
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://flipletters.com/examples/posters/trainboard.jpg
description: FlipLetters is a web app that turns typed text and uploaded images into split‑flap and flip‑dot board animation
  videos, complete with synthesized mechanical click sound synced to every flip. It runs at app.flipletters.com, ships six
  board styles (station boards, flip‑dot matrices, color‑flap art boards, a desk marquee, and framed announcement boards),
  and is built by Terahertz Inc. The service offers free and premium plans, with pricing details on its site.
url: https://artifacts.apis.io/flipletters-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-08 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-08'
modified: '2026-11-08'
tags:
- Animation
- Web App
- Split-Flap
- Flip-Dot
- Free
- Premium
tags_raw:
- Animation
- WebApp
- Split-Flap
- Flip-Dot
- Free
- Premium
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/flipletters-com-agentic-access.yml
- type: Plans
  url: plans/flipletters-com-plans-pricing.yml
- type: Spectral
  url: rules/flipletters-com-rules.yml
- type: JSONLD
  url: json-ld/flipletters-com-context.jsonld
- type: Vocabulary
  url: vocabulary/flipletters-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/flipletters-com-data-model.yml
- type: ErrorCatalog
  url: errors/flipletters-com-problem-types.yml
- type: Conformance
  url: conformance/flipletters-com-conformance.yml
- type: LLMsTxt
  url: llms/flipletters-com-llms.txt
- type: MCPServer
  url: mcp/flipletters-com-mcp.yml
- type: WellKnown
  url: well-known/flipletters-com-well-known.yml
- type: Hosts
  url: hosts/flipletters-com-hosts.yml
- type: Vendors
  url: vendors/flipletters-com-vendors.yml
- type: TermsOfService
  url: https://flipletters.com/terms
- type: PrivacyPolicy
  url: https://flipletters.com/privacy
- type: Authentication
  url: authentication/flipletters-com-authentication.yml
- type: DomainSecurity
  url: security/flipletters-com-domain-security.yml
- type: Website
  url: https://flipletters.com/
- type: Documentation
  url: https://flipletters.com/docs
- type: Pricing
  url: https://flipletters.com/pricing
- type: Blog
  url: https://flipletters.com/blog
- type: About
  url: https://flipletters.com/about
apis:
- name: FlipLetters API
  description: Cloud render, teams, workspaces, and API keys for FlipLetters.
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  aid: flipletters-com:flipletters-api
- aid: flipletters-com:flipletters-com-discovery-api
  name: FlipLetters Discovery API
  description: Spec and docs on flipletters.com
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  tags:
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/flipletters-com-discovery-api-openapi.yml
- aid: flipletters-com:flipletters-com-keys-api
  name: FlipLetters Keys API
  description: Mint/revoke flk_ keys (Firebase session only)
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/flipletters-com-keys-api-openapi.yml
- aid: flipletters-com:flipletters-com-postiz-api
  name: FlipLetters Postiz API
  description: Schedule/draft/post via a connected Postiz
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  tags:
  - Postiz
  properties:
  - type: OpenAPI
    url: openapi/flipletters-com-postiz-api-openapi.yml
- aid: flipletters-com:flipletters-com-render-api
  name: FlipLetters Render API
  description: 'Cloud MP4 export (scope: render)'
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  tags:
  - Render
  properties:
  - type: OpenAPI
    url: openapi/flipletters-com-render-api-openapi.yml
- aid: flipletters-com:flipletters-com-teams-api
  name: FlipLetters Teams API
  description: 'Shared template library (scope: team)'
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  tags:
  - Team
  tags_raw:
  - Teams
  properties:
  - type: OpenAPI
    url: openapi/flipletters-com-teams-api-openapi.yml
- aid: flipletters-com:flipletters-com-workspaces-api
  name: FlipLetters Workspaces API
  description: Agency projects and Postiz destinations
  humanURL: https://flipletters.com/docs
  baseURL: https://app.flipletters.com
  tags:
  - Workspace
  tags_raw:
  - Workspaces
  properties:
  - type: OpenAPI
    url: openapi/flipletters-com-workspaces-api-openapi.yml
x-enrichment:
  date: '2026-11-08'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

FlipLetters API — frequently asked questions

Does FlipLetters have an API?

Yes. APIs.io lists 7 APIs from FlipLetters, including FlipLetters API, FlipLetters Discovery API and FlipLetters Keys API, and 4 more.

Is there an OpenAPI specification for the FlipLetters API?

Yes. APIs.io indexes 6 OpenAPI specifications for FlipLetters, each linked for download from this page.

How do I authenticate with the FlipLetters API?

FlipLetters documents its authentication (http · 1 scheme). The details are profiled on APIs.io as FlipLetters Authentication.

How much does the FlipLetters API cost?

FlipLetters publishes its prices; its Free plan is $0 as of 2026-11-08. APIs.io lists 3 pricing plans for FlipLetters, with each plan's price, limits and inclusions under Pricing on this page.

Does FlipLetters have an MCP server?

Yes. APIs.io lists 1 MCP server for FlipLetters: Remote MCP server at app.flipletters.com requiring an API key.

Is the FlipLetters API ready for AI agents?

FlipLetters has a Kin Score of 39.1 out of 100 (thin) and an Agent Readiness score of 39.8 (agent-ready), scored by API Evangelist on 2026-11-13.

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