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15Five vs Mailgun: 2026 Comparison

15Five Mailgun
Overview A performance management platform with continuous feedback, OKRs, engagement surveys, and manager effectiveness tools. A transactional email API service for developers with email sending, receiving, validation, and deliverability tools.
Pricing Subscription ($4-$14/user/month) Freemium (Free-$80/month)
Key Features
  • Weekly check-ins
  • OKRs
  • Engagement surveys
  • Performance reviews
  • 1-on-1s
  • High fives recognition
  • Career development
  • Analytics
  • Email API
  • SMTP
  • Email validation
  • Inbound routing
  • Analytics
  • Deliverability
  • Templates
  • Webhooks
Pros
  • Continuous feedback model
  • Easy to use
  • Good engagement tools
  • Manager enablement
  • Flexible API
  • Good validation
  • Inbound email processing
  • Reliable
Cons
  • Limited HRIS features
  • Can feel redundant with other tools
  • Basic reporting
  • Feature overlap with others
  • Free plan very limited
  • Pricing can be confusing
  • Support varies
  • Interface basic