Choose Lettermint if you need
- ISO 27001 or SSO. We haven't found them on Plunk's website.
At a glance
- Both have a free plan.
- Lettermint's lowest paid plan is Starter at €10 per month, as of October 28, 2026.
- Both list GDPR.
- Only Lettermint lists ISO 27001 and SSO.
- Both have a public API.
From each tool's own website, checked on the dates below, and from published reviews.
Which to choose
From the facts checked for both tools, not from opinion. A fact we haven't confirmed for one of them is never counted.
Choose Plunk if you need
No checked fact sets Plunk apart from Lettermint yet.
Lettermint
Nobody has reviewed Lettermint yet. Its rating shows once it has 3 reviews.
Review Lettermint
Plunk
Nobody has reviewed Plunk yet. Its rating shows once it has 3 reviews.
Review PlunkThe facts
- What it does
- LettermintA European transactional email service running on its own infrastructure, exclusively in the EU.
- PlunkTransactional email, marketing campaigns, and automated workflows, all against one contact list
- Free plan
- LettermintYes
- PlunkYes
- Pricing
- LettermintMonthly tiers by email volume
- PlunkNot confirmed
- Paid plans from
People who switched
Reviewers who say they used one of these before the other.
No reviewer has said they moved between Lettermint and Plunk yet.
Used either of them?
Your review makes this comparison better for the next person. Review Lettermint or review Plunk.