Introduction The VisibleThread b API provides services for analyzing/searching documents and web pages. To use the service you need an API key. Contact us at support@visiblethread.com to request an API key. The services are split into Documents and Webscans. Documents Upload documents and dictionaries so you can : - Measure the readability of your document - search a docume
https://api.visiblethread.com/api/v1
Auth type
API Key Header
Auth header
apiKey: YOUR_API_KEY
Rate limit
Enterprise limits
Pricing
Enterprise / contact sales
Free quota
None
Documentation
https://api.apis.guru/v2/specs/visiblethread.com/1.0.json
Endpoint status
Server online — HTTP 403 — server is online but path returned an error (may require auth)1.30s
(checked Mar 29, 2026)
Builder score
D
45%
builder-friendly
API key in the apiKey header
apiKey: YOUR_API_KEY
Document analysis and language clarity. Pricing via enterprise contract. Typically $100-500+/user/yr. API access included with enterprise plans. Contact sales.
| Method | Path | Description |
|---|---|---|
| GET | /dictionaries |
Get your list of dictionaries |
| POST | /dictionaries |
Upload a dictionary (CSV) |
| GET | /documents |
Get your list of documents |
| POST | /documents |
Upload a document |
| GET | /documents/{docId} |
Get data from a previously submitted document |
| GET | /searches |
Get your list of searches |
| POST | /searches |
Run a search |
| GET | /searches/{docId}/{dictionaryId} |
Gets search results for a particular document/dictionary |
curl 'https://api.visiblethread.com/api/v1/dictionaries' \ -H 'apiKey: YOUR_API_KEY'
{}
Data sourced from API Map. Always verify pricing and rate limits against the official VisibleThread documentation.