Resend vs Retool
The email API for developers — built by the Nodemailer team
vs. The low-code platform for internal tools, workflows, and AI agents
Pricing tiers
Resend
Free
3,000 emails/month, 100 emails/day. 1 custom domain. Ideal for side projects.
Free
Pro — 50k
50,000 emails/month. 10 custom domains. Priority support.
$20/mo
Pro — 100k
100,000 emails/month. 10 custom domains.
$35/mo
Scale — 100k+
Tiered from 100k → 2.5M emails/month. Dedicated IP add-on available.
$90/mo
Scale — 2.5M
2.5M emails/month.
$1150/mo
Enterprise
3M+/month, dedicated IP included, SSO, custom contract.
Custom
Retool
Free
$0. Up to 5 users. Unlimited apps + mobile. 500 workflow runs/month. 5GB DB + storage. 20 hrs/mo Agents.
Free
Team
$10/builder/mo + $5/internal user/mo. 5k workflow runs. Staging env. App releases.
$10/mo
Business
$50/builder/mo + $15/internal user/mo. Audit logs, rich permissions, portals, embedded apps, external user pricing.
$50/mo
Enterprise
Custom. SAML/OIDC SSO, source control, error monitoring, full white-labeling, volume discounts.
Custom
Free-tier quotas head-to-head
Comparing free on Resend vs free on Retool.
| Metric | Resend | Retool |
|---|---|---|
| custom domains | 1 domains | — |
| emails per day | 100 emails/day | — |
| emails per month | 3000 emails/month | — |
Features
Resend · 12 features
- Audiences — Contact list management with custom fields.
- Batch Send — Send up to 100 emails in one API call.
- Broadcasts — Bulk email campaigns with audiences, A/B testing, analytics.
- Dedicated IP — Add-on for high-volume senders. Auto warmup.
- Domains — DKIM/SPF/DMARC auto-verification. Per-domain analytics.
- Idempotency — Prevent duplicate sends with Idempotency-Key header.
- Logs + Analytics — Full email logs, delivery heatmap, events table.
- React Email — OSS library (3M+ downloads) to compose emails in React/JSX.
- Scheduled Send — scheduledAt parameter for future delivery.
- Send API — POST /emails endpoint to send. Supports attachments, scheduled send, idempotency…
- Suppressions — Auto-managed bounce + complaint list. API to add/remove.
- Webhooks — Email lifecycle events: sent, delivered, bounced, complained, opened, clicked.
Retool · 14 features
- Apps (Web + Mobile) — Drag-drop UI builder with 100+ components.
- Audit Logs — Track every user action.
- Custom JavaScript — Write JS anywhere in app logic.
- MCP Support — Expose Retool workflows to AI agents.
- Modules — Reusable component bundles.
- Retool Agents — AI agents that use Retool queries + apps as tools.
- Retool Database — Managed Postgres with GUI + collab.
- Retool Embed — Embed apps into your SaaS.
- Retool Forms — Public forms that write to DBs.
- Retool Portals — External-facing apps for customers.
- SAML/OIDC SSO (Ent) — Enterprise auth.
- Source Control (Ent) — Git-backed version control for apps.
- White-labeling (Ent) — Full brand customization.
- Workflows — Cron + webhook-triggered automations with branching.
Developer interfaces
| Kind | Resend | Retool |
|---|---|---|
| CLI | Resend CLI | — |
| SDK | react-email, resend-go, resend-node, resend-php, resend-python, resend-ruby | — |
| REST | Resend REST API | Retool REST API (Workflows) |
| MCP | — | Retool MCP |
| OTHER | SMTP Relay, Webhooks (Svix) | Retool Database, Retool Editor, Self-Hosted (on-prem) |
Staxly is an independent catalog of developer platforms. Outbound links to Resend and Retool are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
Want this comparison in your AI agent's context? Install the free Staxly MCP server.