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Software · head to head

MongoDB Atlas vs PostHog

M

MongoDB Atlas

Software

The multi-cloud developer data platform

From
On request
Rated
-
Full reviewWebsite
PostHog logo

PostHog

Software

The single platform to analyze, test, observe, and deploy new features

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only PostHog has a free tier, so it costs nothing to try first.
  • Each has a real cost: MongoDB Atlas free M0 tier is capped at 512 MB of storage per mongodb.com/pricing (Aug 2026); backup storage is not available at all on the Free tier; PostHog the free tier covers 1M events, 5K web session recordings and 2.5K mobile recordings per month before usage-based billing starts

Where they differ

Only the attributes on which MongoDB Atlas and PostHog actually diverge.

Attributes where MongoDB Atlas and PostHog differ
AttributeMongoDB AtlasPostHog
Starting priceOn requestFree
Free tierNoYes
PlatformsWebWeb, Ios, Android, Api
FoundedUnknown2020

Identical on both: pricing model (usage-based), user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in MongoDB Atlas

Nothing recorded that PostHog does not also cover.

Only in PostHog

  • Product analytics
  • Session recording
  • Feature flags
  • A/B testing
  • Heatmaps
  • SQL access
  • Data warehouse
  • Apps platform

What people use each for

The jobs each tool is most often brought in to do.

MongoDB Atlas

No use cases recorded yet. See the MongoDB Atlas review.

PostHog

  • Product analyticsnot MongoDB Atlas
  • Feature experimentationnot MongoDB Atlas
  • User behavior trackingnot MongoDB Atlas
  • A/B testingnot MongoDB Atlas
  • Debug production issuesnot MongoDB Atlas

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

MongoDB Atlas

  • Free M0 tier is capped at 512 MB of storage per mongodb.com/pricing (Aug 2026); backup storage is not available at all on the Free tier
  • Atlas Search and Vector Search are billed separately from the base cluster, from $0.12 up to $4.22 per hour per tier, per mongodb.com/pricing

PostHog

  • The free tier covers 1M events, 5K web session recordings and 2.5K mobile recordings per month before usage-based billing starts
  • Accounts without a card on file are limited to 1 project; adding one raises it to 6
  • Data retention is 1 year until a card is added, which extends it to 7 years
  • Support is community-only until the account is on a paid plan
  • Error tracking is capped at 100K exceptions and surveys at 1500 responses per month on the free tier

Pricing, plan by plan

MongoDB Atlas

On request

No published plan breakdown. See the MongoDB Atlas review.

PostHog

Free
  • FreeFree
    • 1M events/month
    • 5K sessions/month
    • Unlimited users
  • Paid$undefined/month
    • $0.00031/event
    • $0.005/session
    • Advanced permissions
  • Enterprise$undefined/month
    • SAML SSO
    • Advanced security
    • Dedicated support

Which should you pick?

Choose MongoDB Atlas if

Nothing in the data separates MongoDB Atlas from PostHog on the points above - pick on price and on how each one feels to use.

MongoDB Atlas review

Choose PostHog if

  • You need product analytics.
  • You want to start without paying.
  • You work on Web, Ios, Android, Api.
  • You also want session recording.
PostHog review

Questions people ask

Is MongoDB Atlas or PostHog better?
Neither clearly leads. MongoDB Atlas starts at On request and PostHog at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, MongoDB Atlas or PostHog?
PostHog has a free tier; the other does not. Paid plans start at On request for MongoDB Atlas and Free for PostHog.
Does MongoDB Atlas or PostHog run on more platforms?
MongoDB Atlas runs on Web. PostHog runs on Web, Ios, Android, Api.
Can I use PostHog for free?
Yes. PostHog has a free tier, so you can try it without paying. MongoDB Atlas starts at On request.
What can MongoDB Atlas do that PostHog cannot?
PostHog covers Product analytics, Session recording, Feature flags, A/B testing.
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