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Inspect a sample message for deliverability problems

AI quiz and question generator for teachers and students

AI assistant for Git repositories that chats with codebases and generates documentation and tests.

Throughput and responsiveness tests from the continuing iperf2 project

Test matching, substitution and extraction rules

AI user testing with synthetic and human testers, run inside the tools you already use.

AI English speaking app for IELTS, TOEIC, and TOEFL practice

A hosted panel for watching and fixing client servers in one place.

Independent TOEFL and TOEIC preparation with online practice, guides and sample tests.

Statistical calculations with method-selection guidance

Browser-based statistics from pasted data

Focused statistics tools for research calculations

Apple-platform VPN client with on-demand rules and custom routing

LAN, Wi-Fi and Internet diagnostics on a phone

Cloud learning and certification preparation with courses, practice tests and hands-on labs.

AI survey simulation that builds virtual audiences and returns simulated feedback.

WireGuard mesh with identity policies and self-hosting options

A mobile network engineer's diagnostic suite

See a website from several geographic browser locations

Discover addresses and map devices to switch ports

Validate mail-domain records and transport policies

Container VPN client for routing application traffic through a provider

Client-side advertising and web-content filtering

A Windows diagnostic toolbox for common administration checks