Short Answer
The direct job is simple: send a code, keep the active code stable during the TTL, verify the submitted code, and end the challenge deliberately. Most auth platforms can participate in that workflow, but they also bring product surface area you may not need.
When Email Magic Links Still Makes Sense
- Your users almost always open email on the same device and browser where they started login.
- Your email provider and corporate inboxes don't rewrite or pre-fetch links (no Safe Links-style scanning to worry about).
- One-tap login matters more than a typed code, and you can tolerate occasional link failures.
Why Teams Look For Alternatives
Tradeoff
Corporate mail gateways (Microsoft Safe Links and similar) often scan or pre-click links, which can burn a single-use magic link before the user ever sees it.
Tradeoff
A link generated on desktop and opened on mobile (or in a different browser profile) frequently fails, because the session context does not travel with the email.
Tradeoff
Forwarded or screenshotted magic links leak a working session token; a code alone is useless without your app's verify step.
Tradeoff
Support cannot easily tell a user 'read me the code' over a call — a link is not something you dictate.
What To Evaluate Instead
An email OTP provider should be judged by challenge semantics, not only by whether it can send an email.
- Does your login need to survive a user switching devices between requesting and completing it?
- Do any of your users sit behind corporate email security that pre-scans links?
- Would a support agent ever need to help a user complete login by voice or chat?
- Is the login action itself sensitive enough that a URL-embedded token is a bigger blast radius than a short-lived typed code?
Where sendotp.email Fits
sendotp.email is intentionally narrower than a general identity platform. It gives your backend two endpoints and one invariant: same email plus same purpose returns the same active code for 10 minutes.
POST /v1/send
{
"email": "[email protected]",
"purpose": "login"
}
POST /v1/verify
{
"id": "otp_01JZ4NQ8F2T7G2A9J6P0G5QX3K",
"code": "493021"
}That makes it a fit for passwordless login, signup verification, generated-report access, private content, and high-risk action confirmation when you want the rest of your auth stack to stay yours.
Migration Plan
- Keep the same email trigger and template, but put a 6-digit code in it instead of (or alongside) the link.
- Add a code-entry input to the login screen the email was requested from.
- Make resend return the same active code instead of issuing a new link, so re-sends don't invalidate an email already in flight.
- Cut over gradually: run both link and code in the same email during rollout, then drop the link once code entry is adopted.
Official Sources Checked
Competitor behavior and pricing can change. These are the official references used for this page.
email OTP alternative
Use a code primitive when a code primitive is the job.
Keep the identity platform where it earns its place. For email OTP, call send, verify the code, and keep resend behavior predictable.
FAQ
What are the alternatives to email magic links for login?
The main alternative is an email OTP: a short numeric or alphanumeric code the user types back into your app instead of clicking a link. It avoids link-scanning and cross-device failures that magic links are prone to.
Is email OTP better than a magic link?
Neither is universally better. Magic links are lower-friction when they work; OTP codes are more robust across devices, corporate mail scanners, and support scenarios. Many products offer both.
Can I run magic links and OTP codes in the same email?
Yes. Put both in the same email during a migration, track which one users actually complete with, and drop the weaker option once you have data.