Loops vs Mailerflow: Which Fits a SaaS Lifecycle Email Stack?

Loops vs Mailerflow comes down to design intent rather than a ranking. Loops is built around event-driven product and lifecycle email for SaaS, with transactional sending bundled into its plans. Mailerflow is a broader email marketing platform: an AI-first builder, visual automations, dynamic segmentation, and a transactional API on a high-priority lane, with unlimited emails on every paid plan.

If your team lives in product events and wants a lean tool that mirrors them, Loops is a natural fit. If you want marketing campaigns, lifecycle flows, AI assistance and transactional sending under one roof — with pricing that doesn't scale by send volume — Mailerflow is the more direct match.

This comparison separates verified facts from opinion. Every Loops figure below was checked on 16 October 2026 on Loops' official pricing page (loops.so/pricing). Mailerflow details come from its own product pages. Plans change; confirm current numbers before you commit.

Comparison Table (Verified on 16 October 2026)

All Loops facts in this table were verified on 16 October 2026 on Loops' official pricing page (loops.so/pricing). Mailerflow facts come from mailerflow.ai. Where something isn't stated publicly, the table says so rather than guessing.

Pricing and Plan Limits

The two products price on different units, and that difference matters more than the headline number.

Loops prices on subscribed contacts, and unsubscribed contacts never count toward your price. Every plan, including Free, lets you upload as many contacts as you'd like. The Free plan covers 1,000 contacts and 4,000 total marketing and transactional sends per rolling 30 days. Growth is $49/month for up to 5,000 contacts with unlimited marketing and transactional sends. Enterprise is custom pricing with priority support and migration help, supporting 1.5M+ contacts with custom marketing and transactional volume.

Mailerflow's Free plan covers 2,500 contacts and 10,000 emails a month. Every paid plan includes unlimited emails, starting at $14.90/month for 5,000 contacts. Yearly billing costs the same as 10 months.

Here's the practical implication, with illustrative numbers only: imagine a SaaS with 4,000 subscribed contacts sending 60,000 emails a month — onboarding drips, trial nudges, product notifications and a weekly digest. On a subscribed-contact model, that volume sits comfortably inside a mid-tier plan. On a send-volume model, 60,000 emails would push you up several tiers. Neither is wrong; they simply reward different shapes of business. High send volume with a modest list favors unlimited-send pricing. A large, mostly dormant list favors subscribed-contact pricing.

Check both pricing pages before you decide, since plan limits and included volumes change.

Email Editor and Templates

Loops' editor and template details are not fully documented on its public pricing page, so check Loops' docs for the current state rather than relying on second-hand summaries.

Mailerflow uses a visual block editor — headings, heroes, products, columns, social links — with reusable templates, plus an AI email builder: describe the email you want and you get a complete responsive design along with subject lines and preview text. Campaigns support A/B testing.

The trade-off for SaaS teams is real. Product emails are often short, code-adjacent and generated from templates in your own repo. Lifecycle campaigns benefit from reusable branded templates that a marketer can edit without a deploy. If most of your email is the first kind, a leaner tool is fine. If a meaningful share is the second, the editor becomes a daily-use surface and deserves weight in the decision.

Automation: Event-Driven vs Visual Workflows

This is the core of the comparison. Loops is designed around event-driven lifecycle email: you send events from your product and trigger emails from them. That model suits onboarding sequences, trial nudges and activation flows, because the trigger is the thing that actually happened in your app.

Mailerflow uses visual automations with waits, conditions, webhooks and AI steps, triggered by signups, events, dates, inactivity and website behavior. An AI automation builder drafts a workflow — trigger, waits, conditions, emails — from a sentence, which you review before activating.

Two illustrative scenarios:

1. Trial expiry. A user starts a trial, doesn't connect an integration, and hits day 10. An event-driven setup fires on the product event directly. A visual workflow can branch: if the integration is connected, send a usage-tips email; if not, send a setup walkthrough, then wait two days and check again.
2. Re-engagement. A contact hasn't opened in 60 days but visited your pricing page twice this week. Website-behavior triggers plus inactivity conditions let you send a different message to that person than to someone who has simply gone quiet.

When you trial either tool, test four things: how events are defined and named, whether you can branch on custom fields, how you debug a contact stuck mid-flow, and whether the workflow can call your own endpoints via webhooks. Those four questions expose most of the friction you'll live with later.

Segmentation and Personalization

Loops segments around contact properties and events; check Loops' docs for the current depth of its filtering and audience tools.

Mailerflow builds dynamic segments on fields, tags, engagement, events and website behavior, and can generate a segment from a plain-language description. Personalization steps and website-behavior data from a JS SDK let you tailor emails to what each contact read or did. For SaaS lifecycle email, the useful question is whether you can target something like "signed up, never invited a teammate, visited pricing twice" without engineering help. If you can't express that in the segment builder, your lifecycle email will stay generic.

Migration matters here too. Mailerflow's CSV import includes duplicate and validity checks, custom fields and tags — which is what you want when you're moving a list that has accumulated three years of inconsistent formatting.

Deliverability and Sending Infrastructure

The shared basics apply to both: send on your own authenticated domain, configure DKIM, SPF and DMARC, suppress bounces and complaints automatically, and monitor reputation.

Mailerflow handles own-domain sending with guided DKIM, SPF and DMARC setup and automatic verification, automatic suppression of bounces and complaints, reputation monitoring and warm-up limits. Analytics cover delivery, bounces, complaints, clicks and approximate opens, per campaign and overall.

Loops' deliverability documentation isn't summarized on its pricing page, so review Loops' docs and status page directly if this is a deciding factor.

A vendor-neutral checklist works for either: can you see per-message delivery logs, how are complaints handled, what happens on a hard bounce, and can you warm up a new domain gradually rather than blasting it on day one?

Transactional Email, API and Integrations

Loops includes transactional sends on the Free plan, unlimited transactional sends on Growth, and custom transactional volume on Enterprise. Transactional sending is included at no additional charge on paid plans.

Mailerflow offers a transactional email API on a high-priority lane with templates and variables, a REST API with scoped keys, idempotency keys, an OpenAPI spec, code samples and a JS SDK, plus signed real-time webhooks with retries and delivery logs. The transactional lane is separate from marketing sends, so a large campaign doesn't compete with password resets.

The architectural question to settle first: one vendor for both marketing and transactional email, or two? One vendor simplifies suppression and consent handling — an unsubscribe or a hard bounce is recorded once. Two systems can isolate risk, but you own the job of keeping suppression lists in sync. Engineers usually ask about idempotency keys and delivery logs first; both exist on the Mailerflow side, and you should confirm the equivalents in Loops' docs if you go that route.

Support, Data Location and Compliance

Loops lists priority support and migration help on Enterprise. Support levels on lower plans aren't stated on the pricing page, so check there if response times matter to you.

Mailerflow includes free migration help — contacts, suppression lists, templates and core automations — on eligible paid plans, GDPR tools covering data export, erasure, consent logs and configurable retention, and data hosted in Europe.

If you sell into the EU, data location and consent records are not paperwork details; they shape what you can promise in a security review. Whatever vendor you pick, read the DPA and check three things: the subprocessor list, the default retention period, and whether consent records are exportable if you leave.

Which One to Choose

Choose Loops if you want event-driven lifecycle email tightly coupled to product events, you prefer pricing based on subscribed contacts where unsubscribed contacts never count, you want transactional sending bundled with marketing on the same plan, and a leaner, developer-oriented tool matches how your team works.

Choose Mailerflow if you want a full email marketing platform with an AI email builder and an AI automation builder, unlimited emails on every paid plan, dynamic segmentation that includes website behavior, a transactional API on a high-priority lane, EU data hosting, and free migration help on eligible paid plans.

Choose neither yet if your list is under a few thousand contacts and you send a monthly newsletter. A free plan on either side may cover you, and you can revisit the decision when event volume or campaign complexity grows.

If you're still mapping the wider field, our breakdown of Beehiiv alternatives covers how to weigh platforms by publishing model, and the Beehiiv vs Mailerflow comparison shows the same criteria applied to a newsletter-first tool.

FAQ

Is Loops cheaper than Mailerflow?

It depends on your shape, not on a verdict. Loops prices on subscribed contacts, so a large list with modest send volume can be inexpensive there. Mailerflow includes unlimited emails on every paid plan from $14.90/month, which favors high send volume on a smaller list. Compare both pricing pages against your own contact and send numbers.

Can I use Loops and Mailerflow together?

Yes. A common split is Loops for product-event email and Mailerflow for campaigns and lifecycle marketing. The cost is operational: you maintain two suppression lists and two consent records, and you need a rule for which system owns unsubscribes.

Does Mailerflow send transactional email?

Yes — a transactional email API on a high-priority lane, with templates and variables, separate from marketing sends.

Does Loops include transactional sending on the Free plan?

Yes. Loops' Free plan includes transactional sends, verified on 16 October 2026 on loops.so/pricing, within the 4,000 total marketing and transactional sends per rolling 30 days.

How hard is migration?

Mailerflow offers free migration help covering contacts, suppression lists, templates and core automations on eligible paid plans. Loops lists migration help on its Enterprise plan. For either, export your suppression list first — it's the part teams most often forget and the part that damages deliverability when it goes missing.

If Mailerflow looks like the better fit, you can see the plans and limits, start on the Free plan with 2,500 contacts and 10,000 emails a month, import your contacts by CSV, and ask about free migration help on eligible paid plans. If you'd rather see the feature surface first, the feature overview walks through the AI builder, automations and transactional API.