SMTPfast vs Loops.

Infrastructure-grade delivery controls instead of a lifecycle messaging app.

Loops is built for SaaS lifecycle messaging, campaigns, and product updates. SMTPfast is built lower in the stack: API/SMTP sending, SES-backed domains, queues, logs, webhooks, suppressions, and delivery safety.

SMTPfast

Sending-volume-oriented plans.

Loops optimizes for SaaS messaging workflows; SMTPfast optimizes for delivery infrastructure plus lightweight marketing primitives.

Loops

Subscriber/audience-oriented lifecycle messaging plans.

Best for: SaaS teams that want a polished lifecycle messaging UI.

What SMTPfast adds

The useful differences for teams evaluating Loops.

SMTP relay and Resend-compatible API.
Idempotency, batch sending, attachments, and scheduling.
Live tail delivery logs and SES-backed domain diagnostics.
Warmup and abuse controls for email infrastructure operations.

Short verdict

Choose Loops if lifecycle messaging UX is the main need. Choose SMTPfast if you need email infrastructure first: API/SMTP sending, domain verification, webhooks, suppressions, logs, and safety controls.

Try SMTPfast free

Feature	SMTPfast	Loops
Pricing model	Simple volume plans	Audience/subscriber tiers
Public free tier	3,000 emails/month	1,000 contacts and 4,000 emails/30 days
API & Sending
REST API
Resend-compatible payloads
SMTP relay
Batch sending	100/request
Idempotency keys
Inline images (cid) and automatic plain text		Not published
Customer webhooks
Share links for sent emails		Not published
Marketing & Audience
Broadcast campaigns
Signup forms
Broken link check before sending		Not published
Workflow automation	Planned
Dynamic segments	Planned
Hosted templates	Planned
Deliverability & Safety
DKIM/SPF/DMARC guidance
Custom MAIL FROM
Suppression management
Live event tail
Warmup and abuse controls
Platform Model
Inbound email	Paid plans
MCP server for AI agents		Not published
Terraform provider	Official	Not published
Agent skill for coding assistants	Official	Not published
API key scopes	Per key	Not published
Open source	Evaluating
Self-hostable	Evaluating
Team members and roles	Paid plans	Not published
No per-seat pricing

Choose Loops if

You want lifecycle messaging UI more than email infrastructure controls.
Marketing/product teams own most email creation.
You do not need SMTP relay or low-level delivery operations.

Choose SMTPfast if

You need the transactional half to be genuinely reliable, not an afterthought beside the campaign tooling.
Your app sends password resets and receipts, and those failing matters more than a campaign looking pretty.
You want webhooks and a queryable log, because that is how you find out something broke.

Migration checklist

1Identify which Loops emails are transactional versus lifecycle campaigns.
2Create an SMTPfast account and generate an API key with email:send scope.
3Add and verify your sending domain with DKIM, SPF, DMARC, and MAIL FROM records.
4Send a low-volume test message and confirm events appear in the SMTPfast logs.
5Move production traffic gradually while watching bounces, complaints, and suppressions.
6Move transactional sends first and leave lifecycle automations until SMTPfast automation work is complete.

Frequently asked questions.

Is SMTPfast better than Loops?

Loops is stronger for lifecycle messaging UX. SMTPfast is stronger for API/SMTP infrastructure, live delivery logs, suppressions, domains, and operational controls.

When should I still choose Loops?

Choose Loops when its core strength matches your team: SaaS teams that want a polished lifecycle messaging UI. SMTPfast is a better fit when you want a developer-first SES-backed API with queues, webhooks, tracking, suppressions, and a focused dashboard already handled.

How hard is it to migrate from Loops to SMTPfast?

Most migrations start with domain verification, a test API key, and one low-risk transactional email path. Resend-compatible payloads are especially quick to move; older providers may require mapping template, webhook, and suppression behavior.