Pl. 01
OPEN COREActivepieces
replaces Zapier
MIT core; packages/ee and server ee code are under a proprietary licence
SPECIMEN PLATES · OPEN-SOURCE ALTERNATIVES
Open source, or just source-available? Read the stamp first.
Many "open-source alternatives" lists mix real open source with licenses that stop you using the code freely. OpenSwap stamps each project from its LICENSE file, then tells you how hard it is to self-host and what it could save against the SaaS.
OPEN SOURCE25The whole repository is under an OSI-approved license.OPEN CORE11The core is under an open license, but some directories (usually ee/ or enterprise/) are proprietary.SOURCE-AVAILABLE4You can read the code, but the license is not OSI-approved (fair-code, Business Source, Functional Source or a custom license).UNDER REVIEW0Licensing is mixed or unclear from the files we read; a human reading is still needed.
Self-host vs SaaS estimator
Self-hosting saves about $780 a year for 20 seats: SaaS $2,400 vs self-host $1,620 (server $144, backups $36, admin time $1,440). Break-even at about 14 seats at these numbers.
Open the full estimator · numbers stay in your browser.
All 40 plates
Pl. 02
OPEN COREAFFiNE
replaces Notion
Core under MIT (Community Edition parts under MPL-2.0 per the EE file); server/Enterprise parts under the AFFiNE EE License, production use needs a paid Enterprise subscription
Pl. 03
OPEN SOURCEAppFlowy
replaces Notion
AGPL-3.0 (OSI-approved, whole repository)
Pl. 04
OPEN SOURCEAppsmith
replaces Retool
Apache-2.0 (OSI-approved, whole repository)
Pl. 05
OPEN SOURCEAppwrite
replaces Firebase
BSD-3-Clause (OSI-approved, whole repository)
Pl. 06
OPEN SOURCEBookStack
replaces Confluence
MIT (OSI-approved, whole repository)
Pl. 07
OPEN SOURCECal.diy (formerly Cal.com)
replaces Calendly
MIT (OSI-approved, whole repository)
Pl. 08
OPEN COREChatwoot
replaces Intercom
MIT core; enterprise/ directory is under a separate licence
Pl. 09
OPEN SOURCECoolify
replaces Heroku
Apache-2.0 (OSI-approved, whole repository)
Pl. 10
OPEN SOURCEDocmost
replaces Confluence
AGPL-3.0 (OSI-approved, whole repository)
Pl. 11
OPEN SOURCEDocumenso
replaces DocuSign
AGPL-3.0 (OSI-approved, whole repository)
Pl. 12
OPEN COREDokploy
replaces Heroku
Apache-2.0 core; content under /proprietary is under a proprietary licence
Pl. 13
OPEN SOURCEEspoCRM
replaces Salesforce
AGPL-3.0 (OSI-approved, whole repository)
Pl. 14
OPEN COREFormbricks
replaces Typeform
AGPL-3.0 core; apps/web/modules/ee is under a separate licence
Pl. 15
OPEN SOURCEJitsi Meet
replaces Zoom
Apache-2.0 (OSI-approved, whole repository)
Pl. 16
OPEN SOURCElistmonk
replaces Mailchimp
AGPL-3.0 (OSI-approved, whole repository)
Pl. 17
OPEN SOURCEMatomo
replaces Google Analytics
GPL-3.0 (OSI-approved, whole repository)
Pl. 18
OPEN COREMattermost
replaces Slack
Source under AGPLv3 (OSI) or a commercial licence; compiled binaries MIT, admin tools Apache 2.0; Enterprise parts licensed separately
Pl. 19
OPEN SOURCEMautic
replaces Mailchimp
GPL-3.0 (read from the LICENSE file; GitHub does not detect it)
Pl. 20
OPEN COREMetabase
replaces Tableau
AGPL-3.0 outside enterprise/; enterprise/ under a commercial licence
Pl. 21
SOURCE-AVAILABLEn8n
replaces Zapier
Sustainable Use License (fair-code); files with ".ee." are separately licensed
Pl. 22
OPEN SOURCENextcloud
replaces Dropbox
AGPL-3.0 (OSI-approved, whole repository)
Pl. 23
SOURCE-AVAILABLENocoDB
replaces Airtable
Sustainable Use License 1.0 (updated 2026-01-29); internal or non-commercial use only, not an OSI licence
Pl. 24
OPEN SOURCEOpenTofu
replaces Terraform
MPL-2.0 (OSI-approved, whole repository)
Pl. 25
SOURCE-AVAILABLEOutline
replaces Notion
Business Source License 1.1 (source-available, converts later)
Pl. 26
OPEN SOURCEPlane
replaces Jira
AGPL-3.0 (OSI-approved, whole repository)
Pl. 27
OPEN SOURCEPlausible
replaces Google Analytics
AGPL-3.0 (OSI-approved, whole repository)
Pl. 28
OPEN SOURCEPocketBase
replaces Firebase
MIT (OSI-approved, whole repository)
Pl. 29
OPEN COREPostHog
replaces Mixpanel
Core under an open licence; ee/ directory is under a proprietary licence
Pl. 30
OPEN CORERocket.Chat
replaces Slack
MIT core; apps/meteor/ee and ee/ are under a proprietary licence
Pl. 31
SOURCE-AVAILABLESentry (self-hosted)
replaces Sentry
Functional Source License 1.1 (FSL-1.1-Apache-2.0); each release converts to Apache-2.0 later
Pl. 32
OPEN SOURCESupabase
replaces Firebase
Apache-2.0 (OSI-approved, whole repository)
Pl. 33
OPEN SOURCETeable
replaces Airtable
Core apps AGPL-3.0, packages MIT; AGPL Section 7 additional term protects Teable brand assets (trademark use restricted)
Pl. 34
OPEN CORETwenty
replaces Salesforce
Mostly AGPL-3.0; certain files carry a commercial licence header
Pl. 35
OPEN SOURCEUmami
replaces Google Analytics
MIT (OSI-approved, whole repository)
Pl. 36
OPEN SOURCEVaultwarden
replaces 1Password
AGPL-3.0 (OSI-approved, whole repository)
Pl. 37
OPEN SOURCEVikunja
replaces Asana
AGPL-3.0 (OSI-approved, whole repository)
Pl. 38
OPEN COREWindmill
replaces Zapier
Apache-2.0 / AGPL-3.0 parts plus a proprietary licence for certain enterprise features
Pl. 39
OPEN SOURCEZammad
replaces Zendesk
AGPL-3.0 (OSI-approved, whole repository)
Pl. 40
OPEN SOURCEZulip
replaces Slack
Apache-2.0 (OSI-approved, whole repository)
Honest limits: first snapshot (2026-11-10). SaaS prices are recorded for all 25 tools (checked 2026-11-10, source on each replace page); the estimator prefills the price on each tool's page. Difficulty is provisional and only rated where a compose file exists in the repository root (15 of 40).