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15Five vs GMass: 2026 Comparison

15Five GMass
Overview A performance management platform with continuous feedback, OKRs, engagement surveys, and manager effectiveness tools. GMass is a mass email and cold outreach tool that works directly inside Gmail. It turns Gmail into a powerful email marketing and outreach platform with mail merge, automatic follow-ups, and campaign analytics.
Pricing Subscription ($4-$14/user/month) Freemium ($0-55/mo)
Key Features
  • Weekly check-ins
  • OKRs
  • Engagement surveys
  • Performance reviews
  • 1-on-1s
  • High fives recognition
  • Career development
  • Analytics
  • Gmail-based sending
  • mail merge
  • automatic follow-ups
  • email tracking
  • campaign reports
  • scheduling
  • Google Sheets integration
Pros
  • Continuous feedback model
  • Easy to use
  • Good engagement tools
  • Manager enablement
  • Works inside Gmail
  • Very easy to use
  • Affordable
  • Great Google Sheets integration
Cons
  • Limited HRIS features
  • Can feel redundant with other tools
  • Basic reporting
  • Feature overlap with others
  • Gmail sending limits apply
  • Limited advanced features
  • No multi-channel support