Stape's server-side GTM hosting starts free at 10,000 requests a month, then jumps to $17/month for 500,000 requests and $83/month for 5 million — a metering model every managed sGTM host in this category shares. That pricing scales with your traffic, not with what the underlying compute actually costs, and a single traffic spike from a campaign can push you into the next tier overnight. Self-hosting swaps that metering for infrastructure you configure directly: walkerOS and OSSTag deploy as Docker containers with their own event-routing logic, RudderStack ships a Docker Compose stack backed by raw Postgres instead of a request-capped API, and gaxy is a single Go binary you can drop behind your own reverse proxy with no per-event ceiling at all.
| Name | Main Category | Sub-Category | Target Alternative | Free Tier Summary | Self-Hostable? | Short Description | Primary Link |
|---|---|---|---|---|---|---|---|
walkerOS | Product Analytics & Monitoring | Server-Side Tag Management | Stape / Taggrs / Addingwell | 100% Free - Self-Hosted (MIT) | Yes - Docker | MIT-licensed event collection layer with browser, Express, AWS Lambda, and GCP Functions sources that route to GA4, Meta CAPI, Google Ads, and BigQuery destinations; bundles into a standalone Docker deployment or imports directly into a TypeScript app. | |
gaxy | Product Analytics & Monitoring | First-Party Tracking Proxy | Stape / server-side GTM hosting | 100% Free - Self-Hosted (MIT) | Yes - Docker | Single Go binary that proxies Google Analytics and GTM requests through your own first-party domain, deployable as a Docker container or Helm chart with configurable route prefixes and no request metering. | |
Matomo Tag Manager | Product Analytics & Monitoring | Tag Management | Google Tag Manager | 100% Free - Self-Hosted (GPLv3) | Yes - Docker | GPLv3 tag manager included with self-hosted Matomo, managing unlimited containers, versions, and releases from your own PHP/MySQL stack, with an official client template for pairing it with a GTM server-side container. | |
RudderStack | Product Analytics & Monitoring | Customer Data Platform & Server-Side Event Routing | Segment / mParticle / Stape | 100% Free - Source-Available Core (ELv2), Self-Hosted (unlimited events) | Yes - Docker | Warehouse-native CDP and server-side event router with a Segment-compatible API. Deploys via Docker Compose (Go + Postgres backend) to stream raw events into data warehouses (Snowflake, BigQuery) and server-side marketing destinations (Meta CAPI, GA4, Google Ads) with zero per-event or per-request fees. | |
OSSTag | Product Analytics & Monitoring | Server-Side Tag Management | Google Tag Manager Server-Side / Stape | 100% Free - Self-Hosted (MIT) | Yes - Docker | Tag manager built on Next.js, tRPC, Drizzle, and Postgres that relays tags through a server-side network path to bypass ad blockers, with SDKs for web, React, and server environments. |
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