Last month I watched a founder spend 40 minutes on a call trying to explain their email stack. Postmark for their transactional email API. Mailchimp for marketing. Google Workspace for team email at $7/user/month. Three vendors, three dashboards, three billing cycles. For a product with 200 users.

That conversation is why this comparison exists.

Loops and JustEmails both promise to simplify email for product teams. But they simplify in different directions. Loops bundles transactional sending with lifecycle marketing — onboarding sequences, drip campaigns, product updates. JustEmails bundles transactional sending with hosted mailboxes — your team email and your app email on the same platform.

Neither is wrong. They're solving different halves of the same sprawl problem. The question is which half matters more for your stack.

Quick Verdict

TL;DR: Loops is the better pick if marketing automation is core to your product — onboarding drips, re-engagement campaigns, audience segmentation. JustEmails is the better pick if you need the transactional API plus business email hosting on the same domains, and you're not running lifecycle campaigns yet (or you're using a separate tool for that). For a lean product team shipping an MVP that needs password resets and support@yourdomain.com, JustEmails covers both for $49/year flat. For a growth-focused team that's ready to build email-driven activation flows, Loops is worth the marketing-tier pricing.

Transactional Email API Feature Comparison

Feature	JustEmails	Loops
Transactional email API	Yes — REST API, webhook delivery notifications	Yes — React-based templates, API sending
Marketing automation	No	Yes — drip campaigns, sequences, triggers
Audience segmentation	No	Yes — properties, events, segments
Hosted mailboxes (receive email)	Yes — unlimited IMAP/SMTP accounts	No
Custom domain sending	Yes	Yes
Built-in email templates	No (you bring your own HTML/plain text)	Yes — visual builder, React Email support
Starting price	$49/year (1K transactional emails/month included)	Free tier available, paid plans scale by contacts
Pricing model	Flat annual + usage tiers	Contact-based + email volume
Team/inbox pricing	$2/member/month add-on	Per-seat pricing on paid tiers
DNS auto-verification	Yes	Yes
SPF/DKIM/DMARC	Full support, auto-configured	Full support
Company backing	Velocity Digital Labs	YC-backed startup (W23)

The core difference is obvious from the feature list. Loops is an email marketing platform that happens to have a transactional API. JustEmails is an email hosting platform that happens to have a transactional API. Same capability, different center of gravity.

Where Loops Wins

I'm not going to pretend Loops doesn't have real advantages. Here's where they beat us.

Marketing Automation From Day One

Loops was built by a team that came out of companies like Linear and Loom. They get product-led growth. Their platform includes drip sequences, event-triggered emails, audience segmentation by properties, and a visual campaign builder.

If your product roadmap includes "build an onboarding email sequence" in the next quarter, Loops has that ready. JustEmails doesn't. We're a transactional API — and honestly, I've had to explain this to our own customers more than once. You send a password reset, we deliver it. That's it. We don't know that User X signed up 3 days ago and should get a "here's what you missed" email.

For early-stage products where activation and retention are the main focus, that built-in marketing automation matters. You skip the integration headache.

Developer-Friendly Template System

Loops supports React Email natively. If your team already writes React, you can build email templates in the same component style as your frontend. Version control them. Review them in PRs. That's actually pretty slick.

JustEmails API accepts HTML or plain text. You build templates however you want — in your codebase, in a headless CMS, whatever. More flexibility, but no built-in tooling. For teams without strong opinions on email templating, Loops' opinionated approach saves time.

Analytics and Engagement Tracking

Loops includes open rates, click tracking, and delivery analytics as core features. You can see which emails drive engagement and iterate on copy.

JustEmails gives you delivery status via webhooks — delivered, bounced, rejected. We're not tracking opens or clicks. (I've gotten grief about this in support tickets. Fair.) If you need engagement analytics, you'd layer in another tool or build your own tracking. For pure transactional — password resets, receipts — you don't need open rates. For onboarding sequences, you do.

Where JustEmails Wins

Now the flip side. Here's where we think we've built something better for certain teams.

Transactional Plus Mailboxes — Same Platform

This is the big one. JustEmails is the only platform I know of that gives you hosted mailboxes (receive email via IMAP/SMTP) and a transactional sending API on the same account.

What that means in practice: your team email (support@yourdomain.com, hello@yourdomain.com) and your app email (noreply@yourdomain.com, receipts@yourdomain.com) share the same DNS configuration, the same SPF/DKIM/DMARC records, the same dashboard. One vendor.

With Loops, you'd still need Google Workspace or Zoho or some other provider for team inboxes. Two vendors. Two DNS configurations. And if your SPF record gets too long (happens faster than you'd think with multiple senders), you're debugging deliverability issues across split providers at 11pm on a Sunday. Ask me how I know. We've covered the real cost of running Google Workspace in detail — the per-user pricing adds up fast.

Flat Annual Pricing — No Contact Limits

JustEmails is $49/year flat. Unlimited domains. Unlimited mailboxes. 1,000 transactional emails/month included. Add 10,000-email/month tiers at $25/year each.

Loops pricing scales by contacts. That's fine when you have 100 users. It gets expensive when you have 10,000. I've seen SaaS founders hit surprise bills when their contact list crossed a tier boundary mid-month.

For teams watching burn rate, predictable annual pricing is easier to budget. You know exactly what you're paying for the year. No "you added 500 contacts last week so here's an invoice" surprises. If you're evaluating pricing models, our flat-fee vs per-mailbox pricing analysis breaks down the economics.

Storage and Receiving — Not Just Sending

Loops is a sending platform. It's really good at sending. But it doesn't receive email. Your customers can't reply to noreply@yourdomain.com and have it land in an inbox you control.

JustEmails gives you full IMAP/SMTP mailboxes. Team members can connect Thunderbird, Apple Mail, or any standard client. You can set up catch-all addresses in minutes. You can migrate existing mail from Google Workspace or Zoho with our built-in migration tools. If you're curious about the migration path, we've written up how to migrate from Google Workspace.

For products where customer replies matter (support tickets, feedback collection), having the receiving side on the same platform is convenient.

Pricing Breakdown

Real numbers as of June 2026.

JustEmails:

All-In Plan: $49/year — unlimited domains, unlimited mailboxes, 10 GB storage, 1,000 transactional emails/month via API
Transactional API add-on: +$25/year per 10,000-email/month tier (stackable)
Storage add-on: +100 GB for $100/year (stackable)
Team members: $2/member/month (owner included free)

Loops:

Free tier: Limited contacts and sends (good for testing)
Growth tier: Starts around $49/month at 5,000 contacts, scales up with list size
Pro/Team tiers: Custom pricing for larger lists and advanced features
Pricing model: contact-based — you pay for your audience size, not just emails sent

The pricing philosophies are different. JustEmails charges by what you use (email volume, storage, team seats). Loops charges by how big your audience is (contacts). For a product with 1,000 users sending 5,000 transactional emails/month, JustEmails runs about $74/year. Loops at 1,000 contacts with marketing features could be $49/month or more depending on tier.

But that comparison isn't entirely fair — Loops gives you marketing automation that JustEmails doesn't have. If you'd otherwise pay for Loops plus a separate email host, the combined cost changes the math.

Who Should Pick What

Choose JustEmails if:

You need both transactional sending and team mailboxes on your domain
You're not running lifecycle marketing campaigns (yet) — or you have a separate tool for that
Budget matters and you want predictable annual pricing under $100/year
You're migrating off Google Workspace and want to consolidate
Your product mostly sends notifications, receipts, and password resets

Choose Loops if:

Email marketing is core to your product — onboarding drips, re-engagement, product updates
You already have team email covered elsewhere (Google Workspace, Zoho, whatever)
You want a visual campaign builder and engagement analytics built in
Your team builds in React and wants React Email template support
You're okay with contact-based pricing that scales with your user count

Either works if:

You're a developer building an MVP and need "just send me password reset emails"
You have under 1,000 users and light transactional volume
You're testing product-market fit and not optimizing stack costs yet

The Honest Take

Loops and JustEmails both reduce email sprawl. But they pull in opposite directions.

Loops says: "You need transactional and marketing together, so we'll bundle them." Great thesis. Makes total sense if your product is marketing-driven and you're building activation flows from day one.

JustEmails says: "You need transactional and team email together, so we'll bundle them." Also a great thesis. Makes sense if you're tired of paying Google Workspace per-user pricing for email that should be a utility.

If I'm honest, plenty of early-stage products don't need marketing automation yet. They need password resets that work and support@domain.com that receives replies. That's JustEmails' sweet spot.

But if your activation funnel depends on a 5-email onboarding sequence triggered by user behavior? Loops is the better tool. We'd just slow you down.

The worst outcome is building on both when you need neither — three vendors, three dashboards, three bills. I've been that person. It's not fun. Pick one direction, ship, and revisit when your requirements actually change.

For the teams that need transactional plus mailboxes on the same domain, we built JustEmails. For everyone else evaluating alternatives, check out our breakdown of JustEmails vs Zoho Mail or the business email pricing survey for 2026. And if you're running a multi-product stack like we do at Velocity Digital Labs, you might find our other tools useful — JustAnalytics for privacy-first analytics, ClickzProtect for ad fraud prevention, or DevOS for AI-powered dev workflows.

Frequently Asked Questions

Can I use JustEmails API for marketing campaigns like Loops?

JustEmails API is built for transactional email — password resets, order confirmations, system notifications. It doesn't include lifecycle marketing automation, drip campaigns, or audience segmentation. If you need both transactional and marketing, you'd run JustEmails for transactional plus a separate marketing tool. Loops bundles both in one platform, which is simpler if marketing automation is a core requirement.

What happens if I outgrow the included 1,000 emails/month on JustEmails?

You add transactional tiers at $25/year per 10,000-email/month block. So 11,000 emails/month costs $49/year base plus $25/year — $74/year total. Stack as many tiers as you need. There's no per-email overage charge; you just pre-purchase capacity. Most early-stage products stay under 10K/month for the first year.

Does Loops support custom domain mailboxes like JustEmails?

No. Loops is a sending platform — it handles outbound email via their infrastructure. It doesn't host inboxes, receive mail, or give you IMAP/SMTP access for team email. If you need support@yourdomain.com to receive customer replies into a mailbox, you need a separate email hosting provider. JustEmails bundles both sending API and receiving mailboxes on the same domain.

Which is better for a solo founder shipping an MVP?

Depends on your roadmap. If you're building a product that needs transactional email now and you also need business email on your domain, JustEmails gives you both for $49/year. If your MVP is marketing-heavy and you plan to run email sequences, onboarding drips, and lifecycle campaigns from day one, Loops is purpose-built for that. Most MVPs need password resets and order confirmations before they need drip campaigns.

Try JustEmails

Unlimited custom domain email hosting for $49/year flat — unlimited domains, unlimited mailboxes, 10 GB storage, full IMAP/SMTP. Built for agencies, freelancers, and anyone managing email across more than one domain.

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JustEmails API vs Loops: Transactional Email for Lean Teams (2026)