Softwr

Marketing · head to head

Mailgun vs Retool

Mailgun logo

Mailgun

Marketing

Email delivery built for developers

From
Free
Free plan
Yes
Full reviewWebsite
Retool logo

Retool

Surveys

The rapid internal tool platform

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Mailgun free tier limited to 100 emails per day, restricting high-volume use cases; Retool builders and internal users are billed as separate seat types, so the true cost depends on the mix rather than the headcount
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Mailgun and Retool actually diverge.

Attributes where Mailgun and Retool differ
AttributeMailgunRetool
PlatformsWebWeb, Self-hosted
CategoryMarketingSurveys
FoundedUnknown2017

Identical on both: starting price (Free), pricing model (subscription), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Mailgun

Nothing recorded that Retool does not also cover.

Only in Retool

  • Drag-and-drop builder
  • Database integration
  • REST API
  • Real-time data binding
  • Workflow automation
  • Custom code
  • Version control
  • 200+ integrations

What people use each for

The jobs each tool is most often brought in to do.

Mailgun

  • Transactional email delivery and SMTP relaynot Retool
  • Email marketing at scale for developers and enterprisesnot Retool

Retool

  • Building internal admin tools and dashboards over existing databases and APIsnot Mailgun
  • Giving operations teams a UI for data they would otherwise query by handnot Mailgun

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Mailgun

  • Free tier limited to 100 emails per day, restricting high-volume use cases
  • Log retention minimal on lower tiers (1 day on Free and Basic plans)
  • Add-on pricing for email validations and extra emails can accumulate quickly for high-traffic users

Retool

  • Builders and internal users are billed as separate seat types, so the true cost depends on the mix rather than the headcount
  • The free plan is capped at 5 users, 500 workflow runs a month and 5 GB of database capacity
  • Audit logging, permission controls, portals and custom branding all require the Business plan at $50 per builder per month billed annually
  • External user access is Business only, and is charged in bands above 50 users
  • Self hosted deployments mirror the cloud tiers but need Enterprise for unlimited users and SSO

Pricing, plan by plan

Mailgun

Free
  • FreeFree
    • 100 emails per day
    • Basic APIs
    • SMTP relay
  • Basic$15/monthly
    • 10,000 emails per month
    • No daily limits
    • Monthly overage options
  • Foundation$35/monthly
    • 50,000 emails per month
    • 1,000 custom domains
    • Email template builder
  • Scale$90/monthly
    • 100,000 emails per month
    • SAML SSO
    • 5,000 email validations

Retool

Free
  • FreeFree
    • Unlimited web and mobile apps
    • 500 workflow runs monthly
    • 5GB database capacity
  • Team$10/month
    • Builders: $10/month (annual) or $12/month (monthly)
    • Internal users: $5/month (annual) or $7/month (monthly)
    • 5,000 workflow runs monthly
  • Business$50/month
    • Builders: $50/month (annual) or $65/month (monthly)
    • Internal users: $15/month (annual) or $18/month (monthly)
    • Audit logging
  • Enterprise$null/contact sales
    • Custom pricing
    • SSO integration
    • Unlimited users

Which should you pick?

Choose Mailgun if

  • You want to start without paying.
Mailgun review

Choose Retool if

  • You need drag-and-drop builder.
  • You want to start without paying.
  • You work on Web, Self-hosted.
  • You also want database integration.
Retool review

Questions people ask

Is Mailgun or Retool better?
Neither clearly leads. Mailgun starts at Free and Retool at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mailgun or Retool?
Mailgun starts at Free and Retool at Free.
Does Mailgun or Retool run on more platforms?
Mailgun runs on Web. Retool runs on Web, Self-hosted.
Can I use Mailgun for free?
Both have a free tier, so you can try either at no cost before committing.
What is Mailgun best used for?
Mailgun is most often used for transactional email delivery and smtp relay, email marketing at scale for developers and enterprises. Of those, transactional email delivery and smtp relay and email marketing at scale for developers and enterprises are not what Retool is typically brought in for.
What can Mailgun do that Retool cannot?
Retool covers Drag-and-drop builder, Database integration, REST API, Real-time data binding.

Answered from the vendors’ own pages

Mailgun: What happens when I exceed my monthly email quota?

Mailgun allows monthly overage options on paid plans. Extra emails are charged from $1.30 to $1.10 per 1,000 emails depending on plan tier. Enterprise customers negotiate custom rates.

Source
Retool: How much does Retool cost?

Retool offers a free tier. Paid cloud plans start at $10/month (Team - builders) or $5/month (Team - internal users), $50/month (Business - builders) or $15/month (Business - internal users). Enterprise pricing is custom. Annual billing provides 20% savings.

Source
Mailgun: Can I upgrade from Free to a paid plan and when does billing begin?

Yes, you can upgrade to paid plans anytime. The first month is free on Foundation ($35/month) and Scale ($90/month) plans, with billing starting on month two.

Source
Retool: What is the difference between builders and internal users?

Builders are users who create applications in Retool, while internal users are those who only access and use the applications. Internal users cost significantly less than builders on all paid tiers.

Source
Mailgun: What currencies and billing periods does Mailgun support?

Mailgun supports monthly billing in USD, EUR, and GBP. Charges are prorated for mid-month signups. Annual billing options are not explicitly listed on the pricing page.

Source
Retool: Can I self-host Retool?

Yes, Free, Team, and Business tiers support self-hosting with comparable features to cloud versions. Enterprise is required for unlimited users, SSO, and advanced self-host features.

Source
Retool: What are AI credits and how do they work?

AI credits are used for app building and AI actions. Free tier includes 250 monthly credits, Team includes 1,000, and Business includes 3,000. Credits renew monthly without carryover and are pooled at the organization level.

Source
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