This comparison usually gets framed as "analytics tool versus error tool", which makes it sound like a category mistake. It is not — the two products have been converging for years. PostHog added error tracking. Sentry added replay, profiling and uptime. Both are now arguing they can be your single tool.
The honest answer is that they are still good at different things, and the choice depends on which problem you actually have.
Pricing read from each vendor's public page in July 2026.
What each is genuinely best at
Sentry is better at errors. This is not close. It has mature source-map and dSYM symbolication, so minified and mobile stack traces are readable. It has distributed tracing across services. It supports dozens of backend languages. If your problem is "something is throwing in production and I need to know exactly where", Sentry is the better tool, and PostHog's own comparison page says as much: if error tracking is your primary need and you do not already use PostHog, Sentry is the more mature choice.
PostHog is better at product questions. Funnels, retention, cohorts, feature flags, experiments, session replay. If your problem is "people are dropping out of onboarding and I do not know where", Sentry cannot answer it — it has no funnel data at all.
What they cost
Sentry — Team is $26/month billed annually for 50k errors, 5M spans, 50 replays and 5GB logs. Business is $80. Errors, spans, replays, logs, cron monitors, uptime checks and profiling meter separately, so the plan price is a floor rather than an estimate.
PostHog — generous free tier: 1M events, 5K session replays, 1M feature-flag requests, 100K exceptions, 1M data-warehouse rows. Beyond that it is usage-based per product: analytics from $0.00005/event, replays from $0.005/recording, error tracking from $0.00037/exception, flags from $0.0001/request.
At small scale PostHog is usually cheaper, because the free tier is large and covers five products. At scale both are usage-based, so both move with volume.
The question neither page asks
Suppose you run both. Sentry tells you a TypeError fired 4,000 times this week. PostHog tells you checkout conversion fell 12%.
Are those the same event?
You cannot answer that from either tool, because the join does not exist. Sentry has no conversion data. PostHog has the conversion data and the exception data, but its error tracking is a separate product surface — the exception and the funnel are not modelled as the same session by default. So the question that actually matters — is this error costing us money, and how much — gets answered by an engineer exporting two CSVs, or more often not answered at all.
That gap is why engineers prioritise bugs by frequency. Frequency is the only number available. It is also close to useless: a noisy analytics 404 firing 40,000 times matters less than one checkout error firing 200 times on the payment step.
The third option
We built Nohmo because that join is the whole point. One dataset holds the error, the session journey and the conversion, so it can compare sessions that hit an error against sessions that reached the same page and did not — and price the difference. Instead of "this fired 4,000 times", you get "this cost roughly $9,600 this week, fix it first".
The same dataset makes something else possible that neither tool does: failures that never throw. A button wired to a handler that returns early. A form that submits into the void. An endpoint answering 200 with an empty body. Nothing raises, so no error monitor sees any of it — but the behavioural signature is obvious if you have the clicks and the journeys.
Where we are worse, plainly: no distributed tracing, no session replay video, no backend-language SDKs, and stack traces are raw rather than symbolicated today. If you need any of those, use Sentry.
Choosing
Use Sentry if you need APM or distributed tracing, session replay video, backend-language coverage, readable minified traces, or self-hosting.
Use PostHog if you want one platform for analytics, flags and experiments, your volume fits the free tier, and you are comfortable with a broad tool that takes some learning.
Use Nohmo if you are a small web or React Native team paying for two tools, you want a bill that does not move with volume, and the question you keep failing to answer is which bug is actually costing you money.
Use both Sentry and PostHog if you have the budget and genuinely need best-in-class at each end. Plenty of teams do. Just know that the join between them is manual, and in practice that means nobody does it.