True cost comparison — not just what the pricing page says
Quick Verdict
Datadog saves you 5%
Best for PostHog
Cloud monitoring and observability platform. Free for 5 hosts, then per-host pricing from $15-$23/ho
Best for Datadog
Open-source product analytics suite. Generous free tier with 1M events/mo, then usage-based pricing
Open-source product analytics suite. Generous free tier with 1M events/mo, then ...
Advertised
$0
/month
True Cost
$180
/month (typical)
Multiple Billing Meters
PostHog bills separately for: analytics events ($0.00031/event), session replays ($0.005/recording),...
Session Replay Storage Costs
Session replays cost $0.005/recording after free 5K/mo. High-traffic sites recording 50K sessions/mo...
Data Pipeline Add-On
Exporting data to external data warehouses (BigQuery, Snowflake, S3) requires the data pipeline add-...
Cloud monitoring and observability platform. Free for 5 hosts, then per-host pri...
Advertised
$0
/month
True Cost
$505
/month (typical)
Log Management Per-GB Ingestion
Log management costs $0.10/GB ingested per month. A mid-size app generating 500GB/mo of logs = $50/m...
APM Per-Host Add-On
Application Performance Monitoring is a separate product at $31/host/mo (APM) or $35/host/mo (APM + ...
Custom Metrics Overage
Each plan includes 100 custom metrics. Additional custom metrics cost $0.05/metric/mo. Apps with det...
Datadog advertises $0/mo. PostHog advertises $0/mo.
Datadog has 3 documented hidden fees. PostHog has 3.
Datadog confidence: 75%. PostHog confidence: 75%.
| Metric | PostHog | Datadog | Winner |
|---|---|---|---|
| Advertised Price | $0/mo | $0/mo | PostHog |
| True Monthly Cost | $180/mo | $505/mo | PostHog |
| Hidden Fee Total | +$180/mo | +$505/mo | PostHog |
| # Hidden Fees | 3 | 3 | PostHog |
| Confidence Score | 75% | 75% | PostHog |
| Pricing Tiers | 2 | 3 | — |
| Affiliate Program | None | None | — |
PostHog advertises $0/mo and Datadog advertises $0/mo. However, when you include hidden fees, PostHog has 3 documented hidden fees adding +$180/mo, while Datadog has 3 hidden fees adding +$505/mo. Based on true cost, Datadog is typically 5% cheaper.
PostHog has 3 documented hidden fees: Multiple Billing Meters, Session Replay Storage Costs, Data Pipeline Add-On. These add approximately +$180/mo on top of the $0/mo advertised price.
Datadog has 3 documented hidden fees: Log Management Per-GB Ingestion, APM Per-Host Add-On, Custom Metrics Overage. These add approximately +$505/mo on top of the $0/mo advertised price.
Choose PostHog if: Cloud monitoring and observability platform. Free for 5 hosts, then per-host pricing from $15-$23/ho. Choose Datadog if: Open-source product analytics suite. Generous free tier with 1M events/mo, then usage-based pricing . The right choice depends on your team size, usage volume, and which features you need most.
This comparison is based on manual research of official pricing pages, terms of service, and user reports. PostHog data has a 75% confidence score and Datadog has 75%. Prices were last verified in April 2026. For the most accurate estimate, enter your specific usage in our calculator.
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