---
title: "GapFill: GA4 Server Tracking Shopify App Profile"
description: "GA4 misses purchases when ad blockers, browser privacy settings or closed tabs stop the tag, and it never sees in-app checkouts in AI assistants or social apps. GapFill compares your orders with GA4 and shows what's missing by channel, source/medium and payment method. Orders still missing after 26 hours are sent to your GA4 property via the Measurement Protocol, with the GA4 client ID kept at checkout. Recurring orders, refunds and cancellations are optional. Nothing is sent until you approve."
canonical_url: "https://shoplist.co/shopify-apps/gapfill-ga4-server-tracking"
markdown_url: "https://shoplist.co/shopify-apps/gapfill-ga4-server-tracking.md"
last_updated: "2026-10-16"
entity_type: "shopify_app"
slug: "gapfill-ga4-server-tracking"
source: "public Shopify app profile allowlist"
---

# GapFill: GA4 Server Tracking Shopify App Profile

> GA4 misses purchases when ad blockers, browser privacy settings or closed tabs stop the tag, and it never sees in-app checkouts in AI assistants or social apps. GapFill compares your orders with GA4 and shows what's missing by channel, source/medium and payment method. Orders still missing after 26 hours are sent to your GA4 property via the Measurement Protocol, with the GA4 client ID kept at checkout. Recurring orders, refunds and cancellations are optional. Nothing is sent until you approve.

## Quick answer
GapFill: GA4 Server Tracking has 0 detected stores in Shoplist. This Markdown profile displays 0 public brand examples; it is not a complete customer list.

## Key facts
- Name: GapFill: GA4 Server Tracking
- Monitoring status: First-adopter watch
- Developer: ULTRO Inc.
- Developer profile: https://shoplist.co/app-developers/ultro5
- Shopify App Store URL: https://apps.shopify.com/gapfill-dev
- Website: https://ultro.co.jp/gapfill/
- Launch date: October 15, 2026
- Shoplist category: Marketing Automation
- Free plan signal: Yes
- Free trial signal: Yes

## Pricing summary
Free: Free; Standard: $19/month \+ usage

Shoplist has not yet found reliable public storefront evidence connecting a Shopify store to this app. This does not mean the app has no users. Some apps are new, admin-only, server-side, theme-independent, or otherwise difficult to detect from public storefront signals.


## Public callouts
- Report of orders missing from GA4, by channel, source/medium and payment method
- Sends only orders GA4 didn't track, matched by transaction ID
- Covers in-app checkouts in AI assistants and social apps, with their source
- Optional: recurring orders, refunds, cancellations and other channels
- Nothing sent until you approve, consent handling, auto-stop if IDs stop matching
## Shopify App Store categories
- Analytics

## Data note
Profile updated: October 16, 2026. This is the profile revision date, not a guarantee that every store was checked on that date.
Public snapshot built: 2026-10-16 10:52:06.885375\+00
Detection metrics refreshed: 2026-10-16 10:52:06.885375\+00
Public app evidence date: 2026-10-16 05:00:26.270255\+00
This generated Markdown profile intentionally exposes only public, stable app-profile fields and a small public app-stack sample from Shoplist. It excludes private contact data, people data, internal scores, crawl provenance, full datasets, and unstable operational fields.

## Related links
- [HTML app profile](https://shoplist.co/shopify-apps/gapfill-ga4-server-tracking)
- [Shopify apps directory](https://shoplist.co/shopify-apps)
- [Shoplist data methodology](https://shoplist.co/data-methodology.md)