No. 12 of 34 ·Event Scheduling Software

Callboard

Web · Self-hosted · API

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Callboard is ranked #12 of 34 in event scheduling software on Freedom251. It runs on API, Self-hosted, Web.

Compared on event scheduling software

Session tracks: Yes
Room scheduling: Yes
Speaker management: Yes

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The record

Purpose: Callboard manages event proposals, weighted reviews, speaker onboarding, agenda planning and schedule publishing.
Hosting: Callboard describes itself as an open-source alternative to Sessionboard that organizers host themselves.
License: The project is open source under the MIT license.
CFP forms: Its proposal form supports conditional questions, shared character limits, participant rules, close dates and routing proposals to tracks.
Review: Reviewers see their assigned proposals, and organizers can use weighted scoring across two rounds.
Speaker portal: Accepted speakers can update session details, upload headshots and materials, complete tasks and read event resources in a portal.
Agenda: The agenda supports room and time placement and flags overlapping sessions in a dedicated conflict view.
Publishing: Published schedules include ordered speaker and co-speaker names and can feed calendar invites, CSV exports and an API.
Integrations: Documented integrations include Accelevents CSV export, optional API push, an Airtable mirror and signed webhooks with optional Svix delivery.
API access: API keys have six independently grantable scopes, four read and two write, and scopes do not cascade.
Security: The documentation says uploads are proxied through the Worker so ownership checks apply on read and write paths, and secrets are supplied through Wrangler rather than stored in the repository.
Deployment: The main application is described as one Cloudflare Worker using D1 and R2.
Demo limitation: The demo prints emails to its console instead of sending them to recipients.
Not available: The site says public self-serve signup and per-organization tenancy are not built yet; organizations are provisioned by the deployment operator.

Where it ranks on Freedom251

Best Event Scheduling Software in 2026#12 of 34
Best Speaker Management Software in 2026#18 of 28

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Sources

callboardhq.com· checked 4 Oct 2026
docs.callboardhq.com· checked 4 Oct 2026
docs.callboardhq.com/api/· checked 4 Oct 2026
github.com/conorbronsdon/callboard-app· checked 4 Oct 2026