Loops vs Resend vs Brevo: Pricing and Best Email Signup Tool for CRM Routing

If you have fewer than 10,000 contacts, send about 5,000 emails a month, and want new signups routed quickly into a CRM, Loops is the strongest fit. Resend is better as a developer-first transactional email API. Brevo is broad and inexpensive, but its workflow and interface can feel cumbersome.

Quick Comparison

Tool	Free plan	1,000–5,000 contacts	5,000–10,000 contacts	Best fit
Loops	1,000 subscribers, 4,000 sends/month	`$49/mo`	`$99/mo`	Fast forms, lists, lifecycle email, and AI-assisted workflows
Resend	1,000 marketing contacts	`$40/mo`	`$80/mo`	Developer-led marketing and transactional email
Brevo	100,000 stored contacts, 300 emails/day	Tiered pricing	Tiered pricing	Broad email marketing and CRM-adjacent tools

Prices are monthly USD prices before tax. Resend Marketing is priced by contacts. Loops is priced by subscribed contacts and includes unlimited sends on paid plans. Brevo pricing depends on both monthly email volume and the contact-storage limit selected. Loops pricing, Resend pricing, Brevo pricing

Fit For This Use Case

Assumptions: fewer than 10,000 contacts, around 5,000 monthly sends, multiple groups or lists, a static website, and fast signup-to-CRM routing.

Requirement	Loops	Resend	Brevo
Embedded signup form	Yes; generated HTML or JSX	Usually build your own	Yes; hosted and embedded forms
Multiple lists or groups	Mailing lists and user groups	Segments and topics	Lists and segments
Add signup to a chosen list	Yes	Through custom code/API	Yes
API for contact capture	Yes	Yes	Yes
Webhooks	Yes; one webhook endpoint per account	Yes	Available through plan/integration options
Zapier / Make routing	Yes	Usually custom API workflow	Yes
Double opt-in	Supported for forms	Requires implementation	Built into signup forms
CLI / AI-agent support	CLI and agent skills	CLI and AI tooling	CLI and MCP server
No backend required for basic form	Yes	Usually no	Yes

Loops can generate a form that adds contacts to public mailing lists and assigns a user-group value. It also supports API contact creation, webhooks, and Zapier or Make integrations. Loops forms, Loops API, Loops webhooks

Resend has contact, segment, topic, Broadcast, and API features, but its model is more developer-oriented. A custom form or server-side integration is normally needed for a tailored signup-to-CRM flow. Resend Audiences, Resend API

Brevo has the most complete no-code form and campaign surface. Its forms can add contacts to selected lists and support double opt-in, but the overall product is broader and more operationally heavy. Brevo signup forms

Pricing In More Detail

Loops

Plan	Price	Subscribers	Sends
Free	`$0/mo`	Up to 1,000	4,000/month
1K–5K	`$49/mo`	1,000–5,000	Unlimited
5K–10K	`$99/mo`	5,000–10,000	Unlimited

Loops is the cleanest price model for regular newsletters: once you are on a paid tier, sending 5,000 emails or considerably more does not add a per-send charge. The free plan is just below the current 5,000-email requirement. Loops pricing

Resend

Product	Plan	Price	Limit
Marketing	Free	`$0/mo`	1,000 contacts
Marketing	Pro	`$40/mo`	5,000 contacts
Marketing	Pro	`$80/mo`	10,000 contacts
Transactional	Free	`$0/mo`	3,000 emails/month; 100/day
Transactional	Pro	`$20/mo`	50,000 emails/month

Resend separates Marketing Email from Transactional Email. Newsletter broadcasts use the contact-based Marketing plans; application-triggered messages use the email-volume-based Transactional plans. Resend pricing

Brevo

Plan	Starting price	Example limits
Free	`$0/mo`	300 emails/day; up to 100,000 stored contacts
Starter	From `$9/mo`	5,000 emails/month; up to 500 contacts on the entry tier
Standard	From `$18/mo`	Includes marketing automation and advanced features

Brevo's free plan can store many contacts, but a single 5,000-person campaign cannot fit within its 300-email daily limit. Paid tiers increase the email volume and may also increase the allowed contact count. Exact pricing for a list approaching 10,000 contacts should be checked in the Brevo account because the limits are linked. Brevo plan details

AI And Developer Workflow

Tool	AI/developer angle
Loops	CLI, agent skills, REST API, generated forms, and webhooks. Good for asking an AI coding agent to implement and maintain the integration.
Resend	Strong API, SDKs, CLI, MCP/AI tooling, and excellent developer documentation. Best when email is part of an application backend.
Brevo	REST API, SDKs, CLI, and an official MCP server, but the wider product surface adds more configuration and concepts.

The important distinction is that “AI-able” does not just mean having an API. For this use case, the useful combination is: an agent-readable API, a form that can be embedded quickly, clear list semantics, and a webhook or integration for CRM routing. Loops has the best balance of those pieces.

Recommendation

Choose Loops if you want the quickest path from:

website signup -> mailing list/group -> confirmation or welcome flow -> CRM

It has the clearest fit for an AI-assisted implementation and costs $49/month up to 5,000 subscribed contacts or $99/month up to 10,000.

Choose Resend if your main requirement is transactional email from code and you are comfortable building the signup and CRM-routing layer yourself.

Choose Brevo only if its broader marketing and CRM features justify the additional product complexity. It is not the best fit when ease of operation is the main problem.