Free tools
Tools that produce real numbers.
An expanding collection of free utilities for technology decisions you need to defend. No email gate, no upsell, and no follow-up sequence. Use them, save the results, and share them with your team.
Used by procurement officers, technical leads, and engineering managers preparing budgets.
For sites WCAG Accessibility Checker
WCAG Accessibility Checker
Scan a public page for common WCAG 2.0, 2.1, and 2.2 accessibility issues.
Run the scan →For site owners and nonprofits
Website Health & Form Security Check
Find broken links, phone layout problems, and forms that are hard to use or open to spam.
Run the check →For Core Web Vitals work
Website Performance Audit
Pulls live Core Web Vitals (LCP, INP, CLS) for your URL, identifies the top three issues hurting your score, and ranks them by fix difficulty against expected impact.
Run the audit →For sites worried about AI search
AI Visibility Audit
See how your site shows up in ChatGPT, Perplexity, and Google's AI Overviews. Checks structured data, content depth, citation-readiness, and crawler accessibility.
Run the audit →For teams evaluating AI chatbots
AI Chatbot ROI Calculator
Estimate support-ticket savings, payback period, and 3-year net from a knowledge-base-grounded AI assistant, using your own volumes and costs.
Calculate ROI →For legacy stack owners
Modernization Cost Calculator
See a starting price for migrating off Drupal 7, Magento 1, classic ASP, Joomla, or unsupported PHP with AI-assisted delivery. Adjusts for site complexity, integrations, and compliance scope.
Open the calculator →For leaders and IT teams
External Security Check
See your organization the way an attacker does, ranked by real risk and mapped to OWASP, CIS and NIST.
Check my security →How these tools work
No email required
Every tool shows results without asking for your email, name, or company. Only the optional full-site reports ask for an email, so we can send them to you.
Your answers stay yours
The calculators work in your browser and OST does not save what you enter. Like the rest of our site, these pages use Google Analytics, Google Ads, Microsoft Clarity and HubSpot to measure visits. See our privacy policy for details.
Conservative numbers
Our cost and ROI estimates assume average conditions, not best-case. The ranges are wide on purpose. Procurement officers can use them as a sanity check, not a quote.
Want a custom calculator?
Want a real estimate, not a calculator output?
The tools give you a defensible range. A 60-minute call with the team that would actually do the work gives you a quote you can take to procurement.