COMPARISON
MailKaka vs MSG91
MSG91 is a well-established Indian communications platform covering SMS, WhatsApp, voice, and email. Both bill in INR, so the real difference isn't currency -- it's whether you want one channel done well with a built-in reply path, or one account across many channels.
| MailKaka | MSG91 | |
|---|---|---|
| Product scope | Transactional email + reply inbox, purpose-built | Broad communication platform: SMS, WhatsApp, voice, and email together |
| Billing currency | INR via Razorpay, GST invoicing | INR -- both bill in Indian Rupees |
| Free tier | 3,000 emails/month, no fixed daily cap | 5,000 emails/month |
| API shape | Resend-compatible request format | MSG91's own API and credit-based system, shared across channels |
| Replies | Land in a real shared team mailbox on your domain | Not part of the email product -- built for one-way sends |
| Buying model | Fixed monthly plans, self-serve signup | Credit packs across channels, more oriented toward sales-assisted onboarding for larger volumes |
MSG91 figures reflect msg91.com/in/pricing/email as of September 2026 -- always confirm current details on their site before deciding, since pricing pages change.
WHY TEAMS SWITCH
Four things that actually matter.
Built for one channel, not five. MSG91 spans SMS, WhatsApp, voice, and email under one account and credit system. If email is your main channel and you don't need the others, that breadth is overhead rather than a benefit.
Replies land in an inbox, not a void. MSG91's email product is built for outbound sending. Every MailKaka domain ships with a real shared mailbox, so a customer hitting reply on a transactional email doesn't go nowhere.
A familiar API if you're coming from a dev-first tool. MailKaka's send API mirrors Resend's request shape -- a common starting point for teams already building with modern SDKs -- rather than a credit-and-channel abstraction shared across SMS and WhatsApp.
Simple, fixed plans. MailKaka prices in flat monthly tiers by email volume and mailbox count. MSG91's credit-pack model works well across channels but adds a layer of unit conversion if all you send is email.
MIGRATING
Switching from MSG91.
MSG91's email API and MailKaka's use different request formats, so this is a rewrite of the send call rather than a config change. The underlying pieces -- sender domain, recipient list, subject, HTML body -- map directly.
await fetch("https://www.mailkaka.in/api/emails", {
method: "POST",
headers: {
Authorization: `Bearer ${MAILKAKA_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
from: "hello@yourdomain.in",
to: ["customer@example.com"],
subject: "Welcome aboard",
html: "<strong>It just works.</strong>",
}),
});Full API reference: docs.md migration prompt.
FAQ
Should I drop MSG91 entirely?
Not necessarily -- if you rely on MSG91 for SMS or WhatsApp OTPs alongside email, there's no conflict running MailKaka for transactional email while keeping MSG91 for other channels.
Is MailKaka cheaper than MSG91 for email specifically?
It depends on volume and mailbox needs -- compare the per-tier email allowance and whether you need a reply inbox, since that's not part of MSG91's email product. Check both current pricing pages before deciding.
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