Side by side

Postdrop vs testmail.app

Both stand on email testing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Postdrop

Free plan Web

Postdrop combines HTML editing, previewing, testing, sharing, and export in a web-based service. Check the plan limits and live-preview allowances against your email workflow before choosing a tier.

Visit Postdrop

Choose testmail.app if your tests need API-retrievable email, dynamically created mailboxes, and documented examples for common testing tools. The free tier has a 100-email monthly allowance and one-day retention; teams needing advanced filters through the simple JSON API will need to use GraphQL instead.

Visit testmail.app

The facts

	Postdrop	testmail.app
Free plan	Yes	Yes
Open source	Not published	No
Runs on	Web	API, Web
Lowest paid plan	Solo: $29 a month	Essential: $9 a month
Plans published	4	6
Maker	Not published	Not published
Website	postdrop.io	testmail.app
On email testing software	#16 of 28	#20 of 28

Postdrop: what it does well

Editor includes syntax highlighting and auto-complete
Preview links open without an account
Exports can be used with named ESPs
Free plan includes 10 test emails daily

What to know first

Free plan permits only three templates
Free plan limits exports to 10 monthly
Live client previews are not included free

testmail.app: what it does well

Creates mailboxes on the fly using address tags.
Offers JSON and GraphQL APIs with multiple client examples.
Supports wildcard search, live queries, sorting, and pagination.
Includes attachments and SpamAssassin reports.
Unlimited collaborators are allowed on every plan.

What to know first

The free plan allows 100 emails per month.
Free-plan email retention is one day.
Advanced filters and custom sorting are GraphQL-only.
Messages above 20 MB are automatically rejected.

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