SMS character counter
Check encoding, units, message parts and estimated campaign cost with a live calculator.
Open the calculatorPractical SMS engineering
Ship messages with fewer surprises.
Understand the encoding details that change SMS segment counts, then test real copy with TextPreflight before it reaches a messaging provider.
SMS segment calculator API
Count GSM-7 septets, UCS-2 units, multipart segments and campaign cost before sending.
Read the guideGSM-7 vs UCS-2 explained
Learn why two messages with the same visible length can produce different bills.
Compare encodingsPrevent the SMS Unicode trap
Find smart quotes, dashes and silent segment multipliers with a before-and-after preview.
Check Unicode costWorst-case SMS template testing
Simulate realistic variable combinations and expose the most expensive rendered case.
Simulate a templateSMS campaign cost estimator API
Turn message variants, recipient counts and your unit price into an auditable forecast.
Forecast a campaignBuild an SMS cost preflight gate
Stop unexpected encoding and segment growth before a delivery request is created.
Build a preflight gate