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Head-to-head · Speaker Management Software

Greenroom vs Callboard

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Greenroom #1 in Speaker Management Software 9.4/10 Open source ✓ 4 of 6 features Visit Greenroom
Callboard #8 in Speaker Management Software 8.7/10 Open source ✓ 0 of 6 features Visit Callboard

Greenroom leads on 0 checks, Callboard on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreGreenroom · 9.4/10
  • Most featuresGreenroom · 4 of 6

Greenroom scores higher on our rubric for speaker management software: 9.4 against 8.7 out of 10; our editors rank them #1 and #8.

Greenroom is the better fit for open-source teams managing speakers end to end. Callboard is the better fit for open-source CFP and conference-program teams.

  • Greenroom fits best

    Open-source teams managing speakers end to end

  • Callboard fits best

    Open-source CFP and conference-program teams

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Side by side

Feature Greenroom 9.4/10 Visit ↗ Callboard 8.7/10 Visit ↗
At a glance
Editor score 9.4 8.7
Ranking #1 in Speaker Management Software #8 in Speaker Management Software
Best for Open-source teams managing speakers end to end Open-source CFP and conference-program teams
Pricing model Free Free
Starting price Open source Open source
Free plan Not checked yet Not checked yet
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Docs Docs
Integrations 1 integrations 3 integrations
Built for Solo, Small business, Mid-market Small business, Mid-market
Features Greenroom 4/6 · Callboard 0/6
Application forms ✓ (best) Not checked yet
Speaker portal ✓ (best) Not checked yet
Contract management Not checked yet Not checked yet
Travel details Not checked yet Not checked yet
Session assignments ✓ (best) Not checked yet
Email automation ✓ (best) Not checked yet
Specs
Speaker limit Not checked yet Not checked yet
Our review
Pros
  • Covers CFPs, blind review, onboarding, scheduling, and publishing
  • Reusable speaker CRM with sourcing, segments, merging, and bulk outreach
  • REST API, signed webhooks, embeds, and Airtable synchronization
  • Conditional CFP forms with track routing and participant rules
  • Weighted multi-round review with assigned reviewer workspaces
  • Agenda, conflict detection, public schedules, API, and integrations
Cons
  • Airtable is the listed third-party integration
  • Self-hosting requires the team to manage deployment responsibilities
  • Its broad event workflow may exceed the needs of simple CFP programs
  • Integrations center on Accelevents and Airtable
  • API access is scoped to sessions, speakers, and metadata
  • Self-hosting adds deployment responsibility for the operating team
Our verdict

Greenroom is an open-source conference program platform for organizers managing speakers from call for speakers through publication. It combines application forms, blind review, speaker status tracking, onboarding tasks, agenda building,…

Read the review →

Callboard is open-source software for event organizers running calls for proposals, proposal review, speaker onboarding, agenda planning, and public programme publishing. It fits conference and event teams that need one workflow spanning…

Read the review →
  1. GreenroomSpeaker Management Software 9.4Open source
  2. CallboardSpeaker Management Software 8.7Open source

Strengths and trade-offs

  • Greenroom — where it wins

    • Covers CFPs, blind review, onboarding, scheduling, and publishing
    • Reusable speaker CRM with sourcing, segments, merging, and bulk outreach
    • REST API, signed webhooks, embeds, and Airtable synchronization

    Where it doesn't

    • Airtable is the listed third-party integration
    • Self-hosting requires the team to manage deployment responsibilities
    • Its broad event workflow may exceed the needs of simple CFP programs

  • Callboard — where it wins

    • Conditional CFP forms with track routing and participant rules
    • Weighted multi-round review with assigned reviewer workspaces
    • Agenda, conflict detection, public schedules, API, and integrations

    Where it doesn't

    • Integrations center on Accelevents and Airtable
    • API access is scoped to sessions, speakers, and metadata
    • Self-hosting adds deployment responsibility for the operating team

More comparisons

All speaker management software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update