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Amplitude vs Fathom Analytics

Self-host either: open-source alternatives compared. · Category: observability & analytics

Both Amplitude and Fathom Analytics are in the observability & analytics category. Plausible Analytics self-hosts as a replacement for both — listed below alongside the picks unique to each.

AmplitudeFathom Analytics
CategoryProduct analytics / event tracking / funnelsPrivacy-first web analytics
SaaS pricing anchorFree tier up to 10M events/mo; Plus/Growth start at $49/mo and rise sharply with event volume$15/mo for 100k pageviews; $44/mo for 400k; $80/mo for 1M
Self-host options listed33

Replaces both — 1 shared open-source pick

These open-source projects appear on both /amplitude/ and /fathom-analytics/ — picking one solves the migration off either SaaS.

Plausible Analyticsplausible/analyticsalivereplaces both

GitHub
★ 24.8k · last commit today
License
AGPL-3.0
Setup time
10min docker-compose (Elixir app + ClickHouse + Postgres)
Monthly cost
$10 VPS; ClickHouse is the heaviest piece but tiny at startup volumes.

Picks unique to each

Amplitude only

  • PostHogalive
    MIT20min docker-compose (the official `hobby` deploy is one command)$20-40 VPS — ClickHouse + Postgres + Kafka + Redis + the app; demanding stack but absorbs serious event volume.
  • RudderStackalive
    AGPL-3.030min docker-compose (rudder-server + Postgres + transformer + control plane)$15 VPS for the server; storage is wherever you route events (BigQuery / Snowflake / your own Postgres).

Fathom Analytics only

  • Umamialive
    MIT10min docker-compose (Next.js + Postgres or MySQL)$5/mo VPS — Postgres-based, very light.
  • GoatCounteralive
    EUPL-1.25min single-binary$3/mo VPS — Go binary + SQLite, runs anywhere.

In a terminal? npx os-alt amplitude or npx os-alt fathom-analytics prints either side — how the CLI works →

FAQ

Which open-source self-host alternatives replace both Amplitude and Fathom Analytics?

1 open-source project appears on both /amplitude/ and /fathom-analytics/: Plausible Analytics.

How many self-host alternatives are listed for Amplitude and Fathom Analytics?

3 for Amplitude, 3 for Fathom Analytics.

Are all the self-host alternatives free?

Yes — every listed option is open source. Your cost is the VPS or hardware that runs it.