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Transactional SMS Software

Alert21

alert21.in · checked 4 Oct 2026

#67 · Transactional SMS Software
Visit alert21.in ↗ Alternatives Alert21 vs Vonage Verify

How it plugs in

—Public API
NoOpen source
NoFree tier

Signal on Transactional SMS Software4.0#67 of 76

Alert21 home page

Pricing

  • SMS pay-as-you-goUsage-based billing · Volume discounts as sending scale grows · Prepaid balance in Indian RupeesOn request

As alert21.in lists them, checked 24 Sept 2026.

Near it

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