Loops vs Resend: Full Platform or Transactional Specialist for SaaS Email
Loops or Resend for SaaS email? Compare plans, prices by list size and volume, and the trade-offs between one platform and a transactional specialist.
The short answer
For a SaaS team that wants password resets, onboarding sequences and product newsletters from one vendor, Loops is the better pick. Its Early Stage plan is free for up to 4,000 sends in any rolling 30 days, and the Growing Audience Plan costs $99 per month with transactional sends to users outside your audience included. If your product only sends triggered email such as receipts, verification codes and invitations, Resend is the better pick: its free plan covers 3,000 emails per month, and the Pro plan is $20 per month for 50,000 emails.
The choice is less about features than about where you want the work to live. Loops puts transactional and marketing mail in one product with one sender reputation and one contact list. Resend keeps the transactional product focused on delivery and developer tooling, and its marketing tab is a separate, contact-priced product. Both can be the right answer depending on whether you want one vendor or the best possible tool for each job.
This page covers what each tool does for a SaaS audience, what it costs at realistic list sizes and send volumes, where each one falls short, and how to decide. Prices are taken from each vendor's pricing page as published when this page was last checked. Plans and limits change, so confirm the current figures on the vendor's pricing page before you buy.
Comparison at a glance
| Tool | Best for | Entry price (plan and billing) | Key limitation |
|---|---|---|---|
| Loops | SaaS teams that want transactional and marketing email in one product | Early Stage: free, up to 4,000 sends in any rolling 30 days. Growing Audience: $99 per month | The free plan sends only to the 1,000 newest contacts and adds a Loops footer |
| Resend | Developers who need reliable transactional delivery and React Email templates | Free: 3,000 emails per month. Pro: $20 per month (monthly billing) for 50,000 emails per month | Marketing campaigns are a separate product, priced by contact count, so you manage two parts of the stack |
Loops: one platform for product and marketing email
Loops is built for SaaS companies that send two kinds of email and want them to share a single contact record. Transactional messages such as password resets, login links and billing notices sit next to onboarding sequences, product updates and newsletters. Because the contact list, the event data and the sender reputation are shared, you can trigger an onboarding sequence from the same event that sends a receipt, and you can suppress a marketing email for someone who has just had a support issue without wiring two systems together.
For a small product team, the practical benefit is that there is only one integration to build, one dashboard to check and one invoice to approve. A founder who is also writing the onboarding copy does not need to learn a second tool, and an engineer does not need to keep two sets of contact data in sync. That operational simplicity is the main reason to choose Loops, and it matters more the earlier a company is, when nobody has time to maintain a separate marketing stack.
Pricing is the easiest part to understand. The Early Stage plan is free and includes all features, with a cap of 4,000 sends in any rolling 30-day window to the 1,000 newest contacts. The free plan also adds a Loops footer to emails and limits sending to 10 emails per second. The Growing Audience Plan is $99 per month and removes the send cap for subscribers, with transactional sends to users outside your audience included. Loops' pricing page sets out the audience sizes each plan covers, so check it against your own list before committing. At $99 per month, the annual cost is $1,188 (12 × $99), before any taxes or add-ons the vendor lists.
Where Loops falls short is specialization. It is not trying to be the most demanding transactional sender on the market, and teams that run high-volume receipts or need very fine control over delivery routing may find the transactional side less deep than a dedicated sender. React Email templates are not built in, so a team that wants to write every email as a React component will need to do that work elsewhere. The free plan is useful for testing a product, but the Loops footer and the 1,000-contact limit on sending mean most growing products will move to a paid plan once they have a real audience.
Loops' pricing page is at loops.so/pricing.
Resend: the transactional specialist that now has marketing
Resend began as a transactional email API and is still at its best there. The product is designed around sending application email from code: password resets, verification codes, invoices, shipping updates and team invitations. The API is clean, the logs make it easy to see what was sent and why it was delivered or bounced, and React Email lets engineers write templates as JSX components that live in the same repository as the rest of the application. For a team that already thinks in code, that workflow removes a lot of friction.
Resend also offers a marketing product, but it is a separate tier. Marketing plans are priced by the number of contacts rather than by emails sent. The Marketing Free plan covers 1,000 contacts with unlimited broadcast sending, 10,000 automation runs and 3 segments. Paid marketing plans start at $40 per month for 5,000 contacts and rise with the contact count. This split means a Resend-based stack is really two decisions: the transactional plan you use for application email, and the marketing plan you use for newsletters and campaigns. Both are priced separately, so it helps to model them separately.
On the transactional side, the free plan includes 3,000 emails per month, a limit of 100 emails per day and 3 domains. The Pro plan is $20 per month for 50,000 emails per month. The Scale plan is $90 per month for 100,000 emails per month, $160 per month for 200,000 and $350 per month for 500,000. Resend's pricing page also lists a $35 per month option at 100,000 emails, so compare the transactional tiers there before you choose, and check how overage is charged on the plan you pick.
Resend's weak spot for a SaaS team is the split itself. If you want one place for lifecycle email, you will have to build the link between transactional events and marketing segments yourself, or accept that the two products do not share everything. Marketing features are also less deep than a dedicated lifecycle platform, so a team that plans complex branching journeys may want to pair Resend with a tool such as Customer.io. Resend is strong on delivery and developer experience; it is not the most complete marketing automation product.
Resend's pricing page is at resend.com/pricing.
What it costs at realistic list sizes
The table below compares the marketing side of the two stacks at common contact counts, along with the closest alternatives for teams that want a dedicated lifecycle tool. Loops publishes two plan prices on its pricing page, so its column shows the plan that applies rather than a per-contact figure. Customer.io prices by profile count, and some tiers are shown only as ranges on its pricing page.
| Contacts or profiles | Loops | Resend marketing | Customer.io |
|---|---|---|---|
| 1,000 | Early Stage (free): up to 4,000 sends in a rolling 30 days, to the 1,000 newest contacts | Marketing Free: $0 per month, 1,000 contacts | Essentials from $100 per month (billed monthly) |
| 5,000 | Growing Audience Plan: $99 per month | Pro marketing at 5,000 contacts: $40 per month | Not listed below 10,000 profiles; check the pricing page |
| 10,000 | Growing Audience Plan: $99 per month | Pro marketing at 10,000 contacts: $80 per month | Essentials 10k profiles: $145 per month (billed monthly) |
| 25,000 | Growing Audience Plan: $99 per month | Pro marketing at 25,000 contacts: $180 per month | Essentials 30k profiles: $325 per month; the 25k point falls between the 20k and 30k tiers |
| 50,000 | Growing Audience Plan: $99 per month | Pro marketing at 50,000 contacts: $250 per month | Essentials 50k+ profiles: from $505 per month |
| 100,000 | Growing Audience Plan: $99 per month, with the audience limit confirmed on the pricing page | Pro marketing at 100,000 contacts: $450 per month | Premium plan with custom profile volume: pricing on request |
Two things stand out. First, Resend's marketing tiers rise steeply with contact count, so a list of 100,000 contacts costs $450 per month on Resend's marketing plan but $99 per month on the Growing Audience Plan at Loops if the audience fits that plan's terms. Second, Loops' Growing Audience price does not change in the table because the vendor's pricing page sets the audience sizes it covers, so the figure is only accurate for lists within those terms. Before choosing, confirm the audience ceiling on the Loops pricing page with your own list size in mind.
On the transactional side, the picture is different. Loops includes transactional sends to users outside your audience on paid plans, while Resend prices transactional volume by emails sent. The next table shows how that plays out at common send volumes.
Transactional email volume and cost
Transactional volume is driven by product activity rather than list size. A product with 2,000 active users who each log in weekly and trigger a few receipts or notices may send far more mail than a newsletter list of the same size. The table below uses monthly email volume to show the cost of each option. The Loops column shows where the transactional volume falls within the plan terms, and the Resend column shows the transactional plan that covers the volume.
| Emails per month | Loops | Resend (transactional) | What to check |
|---|---|---|---|
| 3,000 | Early Stage (free) covers up to 4,000 sends in a rolling 30 days | Free: 3,000 emails per month, 100 per day | Resend's daily cap of 100 can matter for launch-day spikes; Loops' rolling window does not work the same way |
| 50,000 | Growing Audience Plan: $99 per month, transactional included | Pro: $20 per month | Transactional-only cost is lower on Resend; adding Loops for marketing changes the comparison |
| 100,000 | Growing Audience Plan: $99 per month, transactional included | Scale: $90 per month (a $35 per month option is also listed at this volume) | Confirm which Resend option fits your send pattern and how overage is billed |
| 200,000 | Check the Loops pricing page for volume terms above the Growing Audience Plan | Scale: $160 per month | Resend's price per email drops as volume rises, which favors high-volume senders |
| 500,000 | Pricing on request for volumes beyond the published plan terms | Scale: $350 per month | Ask Loops for a quote before comparing totals at this volume |
The main pattern is this: for transactional-only sending, Resend is cheaper at almost every volume, because its Pro plan at $20 per month covers 50,000 emails. For a team that also sends marketing email, the comparison changes. A Resend stack with a marketing plan at 10,000 contacts costs $80 per month on the marketing side on top of the transactional plan, which can make the total close to, or above, the $99 Loops figure. The honest answer depends on the size of the list, the send volume and how much of the marketing side you actually use.
Who should choose Loops
Loops fits a SaaS team that needs lifecycle email in one place and does not want to maintain two products. Typical cases include a company that wants to send a welcome sequence when someone signs up, a password reset when they request one, and a monthly product update to everyone who has opted in, all from one contact record with shared data. It also fits a team with no dedicated email engineer, because the setup is closer to a configured product than a set of integrations.
Loops is a poor fit for a team that wants the strictest possible transactional delivery controls, or for an engineering group that wants templates managed as React components. It is also less suited to a company whose marketing team already runs a mature tool that it does not want to replace. In that case, adding Loops for transactional sending alone would duplicate work.
Who should choose Resend
Resend fits developers who want an email API they can reason about, with logs, a clear send model and React Email templates. It is the stronger choice when transactional email is the main job, when the team wants that email to be versioned alongside the product code, and when the free plan of 3,000 emails per month is enough to validate the product. Resend's transactional pricing is easy to predict: the Pro plan is $20 per month for 50,000 emails, and the step-ups are published.
Resend is a weaker choice for a team that wants all of its lifecycle email in one product, because the marketing side is a separate plan with its own contact-based pricing. It is also a weaker choice for teams whose marketing needs go beyond broadcasts and simple automations, since those teams will probably want a dedicated lifecycle tool alongside Resend.
Pairing options for the marketing side
If you choose Resend for transactional mail, the marketing side is the decision that needs the most care. Two common pairings are worth checking.
Customer.io is a lifecycle platform built around event-driven journeys. Its pricing starts at $100 per month for the Essentials plan, with profile-based tiers from $145 per month at 10,000 profiles, $235 at 20,000, $325 at 30,000, $415 at 40,000 and from $505 at 50,000 or more, all billed monthly on the figures shown on its pricing page. Premium uses custom profile volumes and is priced on request. The company also runs a Startup Program that gives eligible early-stage companies that have raised under $10 million 12 months free, so check whether your company qualifies before you budget for it. Customer.io is the better choice if your marketing depends on complex branching based on product events. It is also more to learn than a broadcast tool.
Kit is a creator-focused email platform with a free plan for up to 10,000 subscribers. The free plan includes unlimited landing pages, forms and email broadcasts, plus tagging and segmentation. Visual Automations and email sequences start on the Creator plan, which is $33 per month billed annually, and the Pro plan is $66 per month billed annually. Kit is a good match for newsletters and simple sequences, but it is not a transactional sender, so it would sit alongside Resend rather than replace it.
Loops avoids this pairing question because it covers both sides in one product, but if your marketing needs grow beyond what Loops offers, you may end up adding a specialist marketing tool later. Plan the data flow between your product and whichever marketing tool you use, so that you are not rebuilding it when the list grows.
How to choose
Start by writing down the three kinds of email you expect to send in the next six months: transactional messages triggered by product actions, onboarding or lifecycle sequences, and newsletters or announcements. Then estimate the monthly volume of each and the size of the contact list that receives the marketing messages. These numbers determine most of the decision.
If transactional volume is high and marketing is small or not yet started, Resend is usually the cheaper and more predictable option, and the marketing plan can be added later at the 1,000-contact free tier. If marketing matters from day one, and you want onboarding sequences tied to product events without building the link yourself, Loops is the simpler stack. If your marketing needs are complex, a dedicated lifecycle platform may be worth its extra cost whichever transactional sender you choose.
Finally, check the terms that change the cost in practice: the Loops audience limits on the Growing Audience Plan, the Resend daily cap on the free plan, the overage rules on each transactional tier, and the way each vendor counts contacts. A tool that looks cheap on its headline price can cost more once those terms apply to your list.
Decision table
| If you need | Pick | Because |
|---|---|---|
| One product for transactional and marketing email | Loops | Shared contacts, events and sender reputation; Growing Audience Plan at $99 per month includes transactional sends to users outside your audience |
| The cheapest transactional-only sender | Resend | Free plan covers 3,000 emails per month; Pro is $20 per month for 50,000 emails |
| React Email templates managed in your codebase | Resend | React Email is a core part of the Resend workflow; Loops does not build it in |
| A free start with no time limit | Loops or Resend, depending on volume | Loops' Early Stage plan is free up to 4,000 sends per rolling 30 days; Resend's free plan covers 3,000 emails per month and 1,000 marketing contacts |
| Complex, event-driven journeys | Resend for transactional, plus Customer.io for marketing | Customer.io is built for branching journeys; Resend handles delivery and product email |
| Newsletters and simple sequences with a free tier | Kit alongside Resend, or Loops | Kit's free plan covers up to 10,000 subscribers; Visual Automations start on Creator at $33 per month billed annually |
Setup and migration checklist
Whichever tool you choose, the switch is easier if you treat it as a data and event project rather than a template project. The following steps apply to most SaaS teams moving onto Loops or onto Resend with a marketing tool.
- Export your current contact list with consent status and the date each contact opted in. Do not import contacts who have unsubscribed or bounced.
- List every transactional email your product sends, the event that triggers it and the template it uses. Count the monthly volume for each.
- Map the same events to the new tool's sending model. For Loops, decide which events start a sequence; for Resend, decide which events trigger a transactional send and which feed a marketing segment.
- Set up a sending domain and confirm SPF, DKIM and DMARC records before sending anything. Resend's free plan allows 3 domains, so plan which ones you need.
- Send a test batch to internal addresses for each template, including the unsubscribe link for marketing mail and a plain-text version.
- Run the old and new sending paths side by side for a short period, and check bounce and complaint rates on both.
- Move transactional sends first, because they are the least optional. Move marketing sequences only after the transactional path has run cleanly.
- Keep the old tool's suppression list and import it into the new one, so that people who have opted out do not receive mail again.
- Record the plan limits you are relying on, such as the Loops audience cap or the Resend daily send cap, so you notice when growth reaches them.
Frequently asked questions
Is Loops free?
Loops has an Early Stage plan with no fee. It includes all features and allows up to 4,000 sends in any rolling 30-day period to the 1,000 newest contacts. The plan adds a Loops footer to emails and limits sending to 10 emails per second. Growing products usually move to the Growing Audience Plan, which is $99 per month.
Does Resend have a free plan?
Yes. The transactional free plan includes 3,000 emails per month, a limit of 100 emails per day and 3 domains. Resend's marketing product also has a free plan for 1,000 contacts, with unlimited broadcast sending, 10,000 automation runs and 3 segments.
Which is cheaper for transactional email only?
For transactional-only sending, Resend is usually cheaper. Its Pro plan is $20 per month for 50,000 emails, while Loops' Growing Audience Plan is $99 per month. The gap narrows if you also need marketing email, because Resend's marketing plans are priced separately by contact count.
Can I use Resend for marketing emails?
Yes. Resend offers a marketing product with contact-based plans. The Pro marketing plan is $40 per month at 5,000 contacts, $80 at 10,000, $180 at 25,000, $250 at 50,000 and $450 at 100,000. It is a separate product from the transactional plan, so you need to choose and pay for both if you use them together.
Does Loops support React Email templates?
React Email is not built into Loops. If your engineering team wants to write email templates as JSX components in the same repository as the product, Resend is the better fit, since React Email support is part of its workflow.
What does Customer.io cost for 10,000 profiles?
On its pricing page, Customer.io lists the Essentials 10k profiles plan at $145 per month, billed monthly. Its Essentials plan starts at $100 per month, and tiers rise with profile count to $505 per month at 50,000 or more. Premium uses custom profile volume and is priced on request. Eligible early-stage companies that have raised under $10 million may qualify for 12 months free through its Startup Program.
Can I move from Resend to Loops later, or the other way round?
Yes, but the move is mostly about contacts, suppression lists and event mapping rather than templates. Export your contacts with consent data, carry over your unsubscribe list and rebuild the triggers in the new tool. Run both paths side by side for a short period before you switch transactional mail, so that you can catch missing events.
Which should a team with no engineers choose?
A team without engineering time usually benefits more from Loops, because the marketing and transactional sides share one setup and one dashboard. Resend is still a reasonable choice if someone on the team can manage a small amount of code, but the benefit of its developer tooling is smaller without an engineer to use it.