Useful online tools
Dictionary, vocabulary practice, and English writing tools.
Schedule auditable one-time or repeating email reminders.
Create memorable short links and review their usage.
Type formulas like in a math app and get clean LaTeX, on desktop or phone
Pick a colour and convert it between HEXA, RGBA, HSL, HSV, and CMYK.
Encode text to Base64 or decode Base64 to text
Query DNS records — A, AAAA, CNAME, MX, TXT, NS, SOA, and more
Check your public IP address and query via API
Generate QR codes from text, URLs, or other content instantly.
Check if your DNS queries are leaking to multiple resolvers. Random test domains are generated and checked via *.track.rayne.cn.