Proton Mail vs Slack: what each really costs

Team size

Billing

Proton Mail

No plan for this billing option

No paid plan to compare for this billing option.

Slack

No plan for this billing option

No paid plan to compare for this billing option.

10 peopleProton MailSlack
Entry paid planNo plan for this billing optionNo plan for this billing option
Vendor price
Monthly cost
Annual cost
Per user / year
Billing commitmentNot recordedNot recorded
Minimum seatsNone statedNone stated
Free planYesYes
Free trialNot statedNot stated

Calculated by SpecEntry from official vendor prices. Taxes and optional add-ons are not included. Open each product page for every plan and the official source.

Proton Mail vs Slack pricing questions

How much do Proton Mail and Slack cost?
Proton Mail paid plans start at $3.99 per month, billed annually (Mail Plus Annual). Slack paid plans start at $7.25/user/month (Pro (annual)).
Is Proton Mail or Slack cheaper for 5 users?
Proton Mail is cheaper for 5 users: $47.88 per year on Mail Plus Annual, against $435 per year for Slack on Pro (annual). That is $387.12 less per year, before tax.
Is Proton Mail or Slack cheaper for 10 users?
Proton Mail is cheaper for 10 users: $47.88 per year on Mail Plus Annual, against $870 per year for Slack on Pro (annual). That is $822.12 less per year, before tax.
Is Proton Mail or Slack cheaper for 25 users?
Proton Mail is cheaper for 25 users: $47.88 per year on Mail Plus Annual, against $2,175 per year for Slack on Pro (annual). That is $2,127.12 less per year, before tax.
Do Proton Mail and Slack have a free plan?
Yes, both list a free plan.