Every email your app sends. Captured. Inspected. Validated.
The email testing platform built for engineering teams that ship fast and can't afford surprises in production.
14-day free trial · No credit card required · Cancel anytime
10M+
Emails tested
500+
Engineering teams
99.9%
Uptime SLA
alice@acme.testmail.neio.ai
Welcome to Acme! Verify your email
bob@acme.testmail.neio.ai
Your password reset link
test+order@acme.testmail.neio.ai
Order #1042 confirmed — ships today
Features
Everything you need to test email
Built for the teams who ship fast and can't afford broken transactional emails in production.
Real Inboxes
Every address at your workspace catches email instantly. Send to user@acme.testmail.neio.ai from any service and it lands in seconds.
Real-Time Delivery
WebSocket push gives you sub-second delivery notifications. No polling. No waiting. Emails surface in your test the moment they arrive.
Full REST API
List, fetch, search, and delete messages with simple HTTP calls. OpenAPI spec included. Works with curl, Postman, or any HTTP client.
Node.js + Python SDKs
First-class SDKs with Playwright helpers. Write email assertions like any other test — no SMTP credentials, no extra infra.
Team Workspaces
Isolated inboxes per workspace. Each team or environment gets its own clean namespace with its own API keys and access control.
Analytics + Spam Scoring
Track volume, delivery rates, and spam scores over time. Catch deliverability regressions before they ever reach production.
Quick Start
Up and running in 60 seconds
Install the SDK, point it at your InboxLens instance, and start asserting on emails in your test suite — no SMTP credentials to manage.
- Works with Jest, Vitest, Mocha, and Playwright
- TypeScript types included out of the box
- Mailosaur-compatible API for easy migration
$npm install @inboxlens/sdkconst { InboxLens } = require('@inboxlens/sdk');const inbox = new InboxLens({ apiKey: 'il_live_...' });// Wait for the welcome emailconst email = await inbox.messages.waitForLatest({to: 'user@your-workspace.testmail.neio.ai',});expect(email.subject).toBe('Welcome to Acme!');
Pricing
Simple, predictable pricing
Simple, transparent pricing. 14-day free trial on all plans. No hidden fees, no surprise bills.
Pro
For indie developers and small teams.
- 50,000 messages / month
- 3-day retention
- 3 workspaces
- REST API + SDK access
- Webhook notifications
- Email support
Team
For growing engineering teams.
- 200,000 messages / month
- 7-day retention
- 10 workspaces
- All SDK integrations
- WebSocket live updates
- Analytics dashboard
- Priority support
Enterprise
For large orgs with specific needs.
- Unlimited messages
- Unlimited retention
- Unlimited workspaces
- SSO / SAML
- Dedicated instance
- SLA guarantee
- Dedicated support