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SMS API Comparisons

OTP Delivery Rates in India: What to Expect

Realistic OTP SMS delivery rates by Indian carrier (Jio, Airtel, Vi, BSNL), DLT impact, time-of-day patterns, DND filtering, and tips to improve delivery.

StartMessaging Team·10 Feb 2026·10 min read

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SMS API Comparisons
Firebase Auth vs Custom OTP API: Pros & Cons

When should you use Firebase phone auth versus a custom OTP API? Compare vendor lock-in, pricing, customization, India delivery, and data control.

StartMessaging Team·8 Feb 202610 min read
SMS API Comparisons
MSG91 vs StartMessaging: OTP API Compared

An honest comparison of MSG91 and StartMessaging for OTP verification in India. Pricing tiers, DLT handling, API simplicity, delivery rates, and support.

StartMessaging Team·6 Feb 20269 min read
SMS API Comparisons
Twilio vs StartMessaging for OTP in India

Detailed comparison of Twilio and StartMessaging for sending OTPs in India. Pricing, DLT, API simplicity, billing currency, and code examples.

StartMessaging Team·4 Feb 20269 min read
SMS API Comparisons
Best OTP API for India in 2026 (Compared)

Compare the top OTP API providers for India in 2026: StartMessaging, Twilio, MSG91, Exotel, and Kaleyra. Pricing, DLT, delivery rates, and features.

StartMessaging Team·1 Feb 202610 min read

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