ecomrestack

battles / Analytics

FullStory vs SegMetrics

FullStory ($850/mo/mo, vibe code 3/10) vs SegMetrics ($495/mo/mo, vibe code 3/10). SegMetrics is the easier one to rebuild yourself — here is what you lose either way.

FullStory
KEEP

Analytics

$850/mo/mo

Vibe code3/10
Moat5/10
MVP
1 week
Full replacement
12-24 months, due to massive DOM storage scale, real-time query engines, and client-side PII masking.
get the build prompt →
SegMetrics
KEEP

Analytics

$495/mo/mo

Vibe code3/10
Moat4/10
MVP
2-3 weeks
Full replacement
9-12 months, due to complex identity stitching logic, third-party API rate limits, and constant ad platform schema changes.

easier to rebuild

get the build prompt →

price gap / year

$4,260/mo

running both / year

$16,140/mo

our call

Start with SegMetrics — highest vibe code, weakest moat.

FullStory

Wrapping rrweb into a web app takes a few days, but storing millions of DOM diffs without killing client performance or ballooning cloud database bills requires serious infrastructure engineering. Client-side PII masking, SOC2 compliance, and fast event indexing cannot be prompt-engineered.

you can rebuild

  • Client-side DOM event and mutation recording
  • Basic session replay video playback
  • Console logs and network request capturing
  • Simple click and scroll heatmaps
  • Basic funnel step tracking

what you lose

  • Automated client-side PII and sensitive input field masking before data transmission
  • Instant retroactive search over unindexed DOM text and element CSS selectors
  • Frustration heuristics like rage clicks, dead clicks, and error clicks
  • Enterprise compliance certifications including SOC2 Type II, HIPAA, and GDPR tooling
  • High-throughput event ingestion infrastructure optimized for gigabytes of raw DOM diffs

real moats

  • Patented client-side DOM capture and event compression engine
  • Proprietary retroactive search index over raw DOM mutation streams
  • SOC2 Type II, HIPAA, and strict client-side PII masking guarantees

open source escape hatches

SegMetrics

Building a simple Javascript tracker and connecting it to Stripe is achievable in a weekend. Rebuilding SegMetrics requires maintaining 30+ ongoing API integrations with Meta, Google, TikTok, Shopify, Klaviyo, and ActiveCampaign while dealing with Safari ITP restrictions, ad spend normalization, and identity resolution.

you can rebuild

  • Basic first-touch and last-touch web traffic attribution dashboard
  • Simple customer LTV calculation by traffic source
  • UTM parameter capturing and first-party cookie persistent logging
  • Manual CSV upload and mapping for daily ad platform spend
  • Basic purchase event webhooks and postback triggers

what you lose

  • Pre-built, maintained integrations with 30+ ad networks, CRMs, and email service providers
  • Automated daily ad spend API synchronization and currency normalization
  • Advanced cookieless server-side identity resolution algorithms
  • Out-of-the-box multi-touch attribution models (W-shaped, linear, time-decay)
  • Automatic cohort refund and subscription cancellation LTV decay adjustments

real moats

  • Continuous maintenance of volatile third-party ad network and CRM API connectors
  • Proprietary identity stitching algorithms navigating Safari ITP and iOS privacy limits
  • Historical multi-year cohort benchmark databases and reporting speed on unaggregated data

open source escape hatches

Questions people ask

Which is easier to rebuild with AI, FullStory or SegMetrics?

SegMetrics. It scores 3/10 on vibe code with a moat of 4/10, so an AI-assisted MVP takes about 2-3 weeks and a full replacement about 9-12 months, due to complex identity stitching logic, third-party API rate limits, and constant ad platform schema changes..

Which one costs less, FullStory or SegMetrics?

SegMetrics at $495/mo/mo for a typical mid-market store. The gap between the two is about $4,260/mo a year.

What do I lose if I replace FullStory?

Automated client-side PII and sensitive input field masking before data transmission Instant retroactive search over unindexed DOM text and element CSS selectors Frustration heuristics like rage clicks, dead clicks, and error clicks

What do I lose if I replace SegMetrics?

Pre-built, maintained integrations with 30+ ad networks, CRMs, and email service providers Automated daily ad spend API synchronization and currency normalization Advanced cookieless server-side identity resolution algorithms

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