Best MSG91 Alternative for Email, SMS, Webhook & MFA Testing
The best MSG91 alternative lets you stop juggling multiple tools for testing emails, SMS, webhooks, and MFA. Test complete user flows in one unified sandbox — faster, safer, and built for developers.
Replace multiple testing tools with one platform
Simulate real production flows safely
Built for developers and growing teams
Does Zunoy Sandbox replace MSG91?
Not for real delivery. Keep MSG91 to send SMS and OTPs to your users, and point dev and staging at Zunoy Sandbox instead, so test messages never use MSG91 credits or reach a real phone.
Key takeaways
Swap only the SMS endpoint in your non-production environments. Create an SMS inbox per environment and copy its API key and sender ID.
Every test SMS lands in a shared inbox where the whole team sees the body, Sender ID and OTP, with no screenshots passed around.
Check DLT templates before carrier approval: send a template ID with variables and see the fully rendered message.
The same account also tests email, webhooks and TOTP, so signup and 2FA flows can be checked end to end.
Free forever plan with 2 SMS inboxes and no credit card. Paid plans start at $5 a month, billed annually.
COMPARISON
Why Zunoy Sandbox Is the Best MSG91 Alternative
A feature-by-feature comparison for teams evaluating an MSG91 competitor or alternative to MSG91.
FEATURES |  MSG91 SANDBOX |  ZUNOY SANDBOX |
|---|---|---|
Email Inbox |  |  |
Authenticated Endpoints | API Key | Required on all |
Team shared inbox | Limited | |
Discord / Slack / Teams validation | | Real-time |
Alert integrations | | Slack, Discord, Teams |
Payload retention | Session only | Plan Based |
Public payload links | | |
Part of a full testing suite | | Email + SMS + TOTP |
SMS Inbox | | |
Webhook Inbox | | |
TOTP Testing | | |
MSG91 Sandbox is great for SMS and OTP delivery testing. Sandbox helps you test the entire product experience.
MIGRATION CHECKLIST
Switch to the Best MSG91 Alternative in under 10 minutes.
No production changes required. No risk to real users.
- 01
Create a free Zunoy Sandbox account
Sign up at sandbox.zunoy.com. No credit card required. Your account includes Email, SMS, Webhooks, and TOTP from day one.
- 02
Create an SMS inbox and copy your credentials
Create one SMS inbox per environment — dev, staging, QA. Copy the API key and sender ID from your inbox settings.
- 03
Update your SMS provider config
Replace your MSG91 Sandbox API endpoint with your Zunoy Sandbox SMS inbox endpoint. Same REST shape. No code changes.
- 04
Send a test OTP and verify it lands
Trigger any SMS/OTP flow in your staging environment. Open your Sandbox SMS inbox. The message is already there — visible to your whole team.
FOR LARGER TEAMS
We'll migrate your team for you. Hands-on. No extra charge.
If your team is comparing apps like MSG91 or moving from a custom enterprise plan — we handle the migration. Setup, environment config, team onboarding, and a live walkthrough. You stay focused on shipping. Available for teams of 5 or more. Typically completed in one working day.
White Glove Onboarding Process:
We audit your current staging email, SMS, webhook, and TOTP setup across all environments
We configure your Sandbox projects, inboxes, and credentials — dev, staging, QA — ready for your team to use
We update your environment configs and verify every email, SMS, and webhook flow lands correctly
Live 45-minute team walkthrough — every feature, every inbox, every alert integration
Cancel your old subscriptions with confidence — we confirm everything is working first
Book a 20-minute call and we'll handle the rest
White Glove Onboarding Process:
We audit your current staging email, SMS, webhook, and TOTP setup across all environments
We configure your Sandbox projects, inboxes, and credentials — dev, staging, QA — ready for your team to use
We update your environment configs and verify every email, SMS, and webhook flow lands correctly
Live 45-minute team walkthrough — every feature, every inbox, every alert integration
Cancel your old subscriptions with confidence — we confirm everything is working first
Book a 20-minute call and we'll handle the rest
Ready to test safely? Start your
free sandbox in under 5 minutes.
No Credit Card required
Free Forever
One Single Tool for - Email + SMS + Webhook + TOTP
Maintain customer trust - Test Alerts before your Users do
Setup under 5 minutes
Real human support by Zunoy Team
EMAIL INBOX — HIGHLIGHTS
Not just a message list. A full Email inspection Suite.
Not just SMTP capture. A full inspection suite with AI scoring, failure simulation, and per-inbox firewall rules that no single-channel tool offers.
HTML preview
See exactly how your email renders in Gmail, Outlook, Apple Mail, and mobile — before it reaches a single real inbox.
AI Scoring
HTML check, link check, spam analysis, performance, and AI content scoring — automatic on every email.
Failure Simulation
Six types of latency, SMTP errors, message loss, duplicates, corrupted attachments, rendering chaos. All simultaneous.
Inbox Firewall
Allowlist domains, block senders, and rate limit — per inbox. Real SMTP rejection to your app on every block.
Auto-Forward Rules
Forward emails to pre-verified addresses manually or automatically using match-any / match-all rules.
Team-Shared Inbox
Real-time for all team members. Everyone sees every email the moment it arrives — no forwarding, no screenshots.
WE ALSO HAVE
Email is just the Start. Three more channels in the Same Workspace.
Every channel your app uses to communicate with users — tested in one place, under one account, visible to your team.
SMS Testing
Test every OTP and transactional SMS without spending a rupee on real delivery. REST API, Sender ID, SMS templates - all are included.
Webhook Testing
Get a unique URL. Point any service at it. Every payload arrives in real time — inspectable, replayable, organised by project.
Shared MFA/TOTP Inbox
Test multi-factor authentication without using a real device. Upload QR codes or secrets and share TOTP access across your QA team. No authenticator app required.
HOW MUCH YOU SAVE
Cancel Four Subscriptions. Keep One.
Most teams using separate tools for email, SMS, webhooks, and TOTP pay $64-$124 per month across four accounts. Zunoy Sandbox replaces them all — with a free plan for small teams and straightforward pricing for larger ones.
What Teams typically Pay across Separate Tools
Mailtrap / Mailosaur / MailSlurp
Email Testing Tools$29-$49 / mo
SMS Sandbox Tool
SMS Testing$15-$30 / mo
Webhook Catcher
Webhook Testing$10-$25 / mo
TOTP / MFA Tool
TOTP / MFA tool$10-$20 / mo
Total Monthly Spends
$64-$124 / mo
VS
Replaced by Zunoy Sandbox
FAQ'S
The things developers ask when choosing the best MSG91 alternative
Is Zunoy Sandbox a strong MSG91 competitor?
As an alternative to MSG91, Zunoy Sandbox adds AI content/spam scoring, failure simulation, inbox firewall rules, and auto-forwarding — plus SMS, webhook, and TOTP testing in the same account.
Does switching require code changes?
For SMTP-based tools, no — just point at our mock server with new credentials. For API-based tools, it's a config swap with a familiar request/response shape.
What happens to my MSG91 Sandbox account during the switch?
Nothing — keep it running until your Sandbox environment is verified and your team has confirmed everything works.
Can I import my existing MSG91 Sandbox setup?
There's no automatic importer, but our white-glove onboarding recreates your inboxes, rules, and configuration for you — typically in one working day.
Do apps like MSG91 offer a free plan?
Yes — the free plan includes email, SMS, webhook, and TOTP testing in one account, with no credit card required.
Can my whole team share the same inbox?
Yes — every Sandbox inbox is shared across your team by default, with no per-seat limits on who can view it.
THE ZUNOY SANDBOX SUITE
Beyond MSG91: Why Zunoy Is the Best MSG91 Alternative for Multi-Channel Testing
Your app sends emails, SMS, webhooks, and TOTP codes. Sandbox handles all four — in one workspace, under one account, visible to your whole team.
Email Inbox
SMTP capture & AI-scored previews
SMS Inbox
Virtual numbers for OTP & transactional SMS
Webhook Inbox
Real-time payloads, replayable & shareable
TOTP Inbox
Shared MFA codes, no authenticator app needed