The MailSlurp alternative without an inbox per test.
Point your app's SMTP at one Mailloop sandbox and every email it sends lands there, whoever it was for. Your tests wait for the message instead of creating inboxes and wiring addresses through the app.
- No credit card needed
- EU-hosted
- Plain SMTP, any language
- entry plan a month
- $12 vs $19.99
- users on the entry plan
- 5 vs 1
- client screenshots a month on it
- 500 vs 5
- where your test data is stored
- EU vs US
How the test changes
One SMTP host, not an inbox per test
MailSlurp's usual pattern creates an inbox in the test and makes the app send to its address. With Mailloop the app keeps its real recipients: point SMTP at the sandbox once per environment and wait for the email in the test. Admin notifications, receipts and imports are captured too, without changing who they go to.
Waiting for the signup email with Mailloop
import { MailloopClient } from '@mailloop/sdk';
const client = new MailloopClient({
apiKey: process.env.MAILLOOP_API_KEY,
});
// The app already sends to the staging sandbox over SMTP.
await signUp('[email protected]');
const email = await client.emails.waitFor(sandboxId, {
to: '[email protected]',
timeout: 30_000,
});Waiting for the signup email with MailSlurp
const MailSlurp = require('mailslurp-client').default;
const mailslurp = new MailSlurp({ apiKey: process.env.API_KEY });
// A new inbox per test, and the app has to send to it.
const inbox = await mailslurp.createInbox();
await signUp(inbox.emailAddress);
const email = await mailslurp.waitForLatestEmail(inbox.id, 30000);What it costs at your volume
The cheapest plan on each side that receives the volume, on monthly billing. MailSlurp's plans above Pro add users, not emails; Mailloop goes to 50,000 emails a month before Enterprise.
| Emails a month | Mailloop | MailSlurp | Difference a year |
|---|---|---|---|
| 500 | $0 Free | $0 Free | Same |
| 1,000 | $12 Basic | $19.99 Starter | $95.88 less |
| 2,000 | $12 Basic | $49.99 Pro | $455.88 less |
| 5,000 | $29 Pro | $49.99 Pro | $251.88 less |
| 10,000 | $29 Pro | On request Enterprise | Public plan vs a quote |
MailSlurp prices from app.mailslurp.com/pricing, checked September 26, 2026. Mailloop prices from mailloop.io/pricing.
MailSlurp vs Mailloop
 Mailloop | MailSlurp | |
|---|---|---|
| Capture | ||
| Catch everything the app sends | Yes: SMTP capture, any recipient | Partly: Mail to its inboxes |
| Throwaway inboxes | Yes: Temporary sandboxes, up to 24 hours | Yes: Inboxes that expire |
| Emails kept | Yes: 200 per sandbox on Free, 1,000 on Basic | Partly: Capped by storage per plan |
| Testing | ||
| Wait for an email in a test | Yes: waitFor in the SDK and API | Yes: waitForLatestEmail |
| Screenshots in email clients | Yes: 500 a month on Basic | Partly: A handful a month below Growth |
| SMS and phone numbers | No: Email only | Yes: Phone numbers and SMS |
| Team and data | ||
| Users on the entry plan | Yes: 5 members | Partly: 1 user |
| Where data is stored | Yes: Germany, EU | Partly: Mainly the United States |
| MCP server | Yes: Hosted, OAuth | Yes: Hosted, OAuth or key |
MailSlurp facts checked on September 26, 2026 against its pricing page, JavaScript docs and DPA. Prices on monthly billing. Mailloop numbers come from our pricing page.
Seen something inaccurate? Tell usWhen MailSlurp fits better.
MailSlurp is a broad email and SMS platform. If your tests go beyond checking the email your app sends, it covers more ground.
MailSlurp, when
- Tests need phone numbers and SMS
- You also run inbox placement tests
- You need SDKs beyond TypeScript
Mailloop, when
- The app should keep its real recipients
- A small team shares one plan
- Test data has to stay in the EU
MailSlurp and Mailloop, common questions
Also looking at Mailosaur or Mailisk? See Mailloop vs Mailosaur and Mailloop vs Mailisk.
Do I need a new inbox for every test?
Where does MailSlurp store data?
How many users do MailSlurp plans include?
Does Mailloop do SMS or inbox placement tests?
Do both have an MCP server?
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