APIVerve Website Readability API

APIVerve Website Readability API scores webpages and returns readability measures for use in software and automated workflows. It suits developers and teams that need repeatable checks rather than a standalone writing editor. Its multiple response formats and integrations are compelling, but 10-credit calls and the free plan’s non-commercial restriction matter when estimating cost and fit.

Overview

The service accepts webpage input through an HTTPS POST request to /v1/websitereadability. Requests use an API key in the x-api-key header, which also works across APIVerve’s 300+ APIs. Each call consumes 10 credits from a shared account pool, so other APIVerve usage can draw on the same allowance. That shared model is convenient for a broader API setup, but readability volume should be budgeted alongside other calls.

Responses support JSON, XML, YAML, CSV, GraphQL, and MCP access. A live request tool on the product page can be tried without an API key, and an embeddable interactive form can be added to a site without putting keys in the markup. These options make the service usable beyond a conventional API integration, while the supported input remains webpages.

Key features

The API returns eight readability scores and grade-level analysis. That gives teams several measures to work with in content checks, but it is not a general text-analysis endpoint: the input format is webpage. Bulk search has a limit of 200, and domain variations are not supported, which may constrain workflows built around alternate domain forms.

Integration coverage includes VerveKit for MCP agent access, VerveSheets formulas for Google Sheets or Excel, and automation through Zapier, Make, Power Automate, Pipedream, n8n, and ViaSocket. Postman and Node.js, Python, and .NET SDKs support developer workflows. The breadth is useful for teams with existing automation or spreadsheet processes; users who only need occasional manual scoring may not benefit from that flexibility.

APIVerve states a 99.9% uptime SLA and typical p50 latency of 1798 ms. It says traffic is protected with TLS 1.2+, stored data with AES-256, and API keys are hashed. Request and response content is processed in real time rather than retained, while usage logs are kept for 90 days.

Pricing

The Free plan costs free and includes 200 credits per month, 5 requests per minute, community support, and non-commercial use with attribution required. At 10 credits per call, the allowance supports up to 20 readability calls per month if all credits go to this API. It is suited to limited non-commercial evaluation, not a commercial deployment.

Starter costs $29.99 a month, billed monthly, and includes 200,000 credits per month, 60 requests per minute, a commercial license, Zapier, Make and MCP access, and email support. This is the entry paid tier for production use; compared with Free, it removes the non-commercial restriction and raises the call allowance substantially.

Pro costs $99.99 a month, billed monthly, for 1,000,000 credits per month and 180 requests per minute. It adds three team members, five scoped sub-keys, and 10 embedded forms, making it a better match for teams managing multiple integrations or forms. Mega costs $299.99 a month, billed monthly, and includes 4,000,000 credits per month, 10 team members, 25 scoped sub-keys, dedicated servers, 90-day audit history, and priority support. It is aimed at larger deployments needing higher allowances and team controls. All paid tiers bill monthly; the Free plan’s 200-credit cap is the sharpest practical constraint.

Platforms

The API is available on web and through API access. Its SDKs and integrations extend it into developer, spreadsheet, and automation workflows, but the service’s core analysis still takes a webpage as input.

Who it's for

This is a strong fit for developers, content teams, and businesses that need to score webpages repeatedly inside an application or automation. Starter is the sensible point of entry for commercial use; Pro or Mega make more sense when team membership, scoped keys, embedded forms, or larger monthly credit pools are important. It is a weaker fit for people seeking a standalone editor, arbitrary text analysis, or a free commercial service.

Pros and cons

• Pros: Six response options, grade-level analysis, and eight readability scores support varied programmatic workflows.
• Pros: A shared API key, no-key playground, and embeddable form lower friction for evaluation and deployment.
• Pros: Paid tiers provide a commercial license, with higher plans adding team controls, scoped keys, and dedicated servers.
• Cons: Each call costs 10 shared credits, so the free plan’s 200-credit monthly pool allows only 20 calls if used solely for readability.
• Cons: Free use is non-commercial and requires attribution, while the input is limited to webpages.
• Cons: Bulk search is capped at 200 and domain variations are unavailable.

Alternatives

For other options, see AI Readability Checkers.

• ToolsVale Readability Checker is a free alternative with broad desktop and mobile platform coverage; choose it when an API workflow is not the priority.
• Readability is a free MIT-licensed GitHub Action, CLI, and Docker image, better suited to teams that want an open-source tool in those formats.
• Eclipse Readability Studio is a free, open-source desktop option for Linux, macOS, or Windows.
• Readability Formulas offers free online readability tools and scoring, with extension and desktop platforms also listed.
• A2Z Tools Plain Language Analyzer is a free web tool for English-only analysis.
• PageRefine is a free web tool with no signup.
• ProfText offers a free API and web plan with 5,000 characters per analysis, 30 clarity rules, AI-generated text detection, and unlimited analyses; choose it when those text-focused checks suit the task better.
• Readability Analysis Tool (RAT) is a free GPLv3 open-source option for Linux and Windows that supports .docx and German readability rules.

Verdict

Choose APIVerve Website Readability API if your team needs webpage scoring inside software or automation and values multiple response formats and integrations. The commercial Starter plan makes the API usable beyond experimentation, but the 10-credit cost per call and shared pool are the key budget checks. Look elsewhere if you need arbitrary text input, free commercial use, or a standalone writing tool.