PostHog describes itself as your product's context layer: it ingests analytics events, session replays, error reports, feature flag evaluations and warehouse tables, then lets you query all of it in one place. Supabase is a hosted Postgres database with authentication, storage, realtime subscriptions, edge functions and generated REST APIs around it. One answers 'what are users doing and why', the other answers 'where does my application keep its data'.
TL;DR
PostHog and Supabase are not substitutes. PostHog is where your product's behaviour data lands - events, session replays, errors, feature flags. Supabase is the Postgres database your application runs on. Both ship a genuinely useful free tier, both are priced by usage afterwards, and most teams end up running the two together rather than choosing one.
The comparison comes up because early-stage teams pick both at the same moment. When you are about to build an MVP you are deciding which services to bolt on first, and PostHog and Supabase both market themselves to exactly that stage with free tiers that need no credit card. They also overlap in one narrow sense: both want to be the place your product data lives, PostHog through its context warehouse that pulls in Stripe, Postgres and HubSpot tables, Supabase because it is the Postgres instance your app writes to.
The pricing structures are different enough that the two bills behave differently under load. PostHog charges per product on usage above a monthly free allowance and lets you set a billing limit per product, so 97% of its customers pay nothing. Supabase charges a flat plan fee plus metered add-ons for compute, storage and egress, so the floor is $25 a month once you need a production database.
| Feature | PostHog | Supabase |
|---|---|---|
| What it is | Product analytics, session replay, error tracking, flags, experiments and a context warehouse | Hosted Postgres with auth, storage, realtime, edge functions and generated APIs |
| Free tier | 1M events, 5K recordings, 1M flag requests, 100K exceptions, 1,500 survey responses per month | 500 MB database, 5 GB egress, 1 GB storage, 50,000 monthly active users, 2 active projects |
| First paid step | Pay-as-you-go above the free allowance, per product, with a billing limit you set | Pro from $25 a month, plus $10 a month in compute credits included |
| Production tier | Same usage model; 6 projects, 7-year retention and email support once a card is on file | Team from $599 a month with SOC 2 and ISO 27001, priority support and SLAs |
| Metered extras | Usage beyond each free allowance; logs retained past default window at $0.05 per GB a month | Disk $0.125 per GB, egress $0.09 per GB, cached egress $0.03 per GB, file storage $0.0213 per GB |
| Data you store | Behavioural events, recordings, exceptions, plus imported Stripe/Postgres/HubSpot tables | Your application's relational data, in plain Postgres |
| Query interface | SQL editor and visual insights over its own warehouse | SQL editor and table editor over your database |
| Exit path | MIT-licensed core; event and warehouse data exportable | 100% portable Postgres - dump it and run it elsewhere |
| Support | Community on free; email above a card, Slack past $2,000 a month | Community on free; email on Pro; priority email and SLAs on Team |
Pick PostHog if
If you are trying to find out where users drop off, which features get used, or why an error only happens on mobile, PostHog is the tool that answers it. Its free tier is large enough that most early products never see an invoice, and the billing limit means the worst case is a number you chose yourself. It does not store your application's records.
Pick Supabase if
If you need a database, user logins and file storage behind an app, Supabase is the shorter path: a Postgres instance with the boring parts pre-wired, from $25 a month once you go beyond the free tier. It will not tell you what users did after they signed up. For most MVPs the answer is Supabase first, PostHog the moment you have users to measure.
No independent review data was collected for this pair, so nothing on this page is a user rating or sentiment score. The figures above come from PostHog's and Supabase's own pricing and product pages, fetched in October 2026.
No. PostHog stores behavioural data such as events, recordings and errors; Supabase stores your application's records. Different data, different queries. Deleting either one leaves a gap the other cannot fill.
Yes, and that is the common setup. The PostHog SDK runs in the same frontend that talks to Supabase, and PostHog's warehouse can pull in Postgres tables so database records sit next to event data in one query.
Both are free at the start. PostHog's free tier covers 1M events and 5K recordings a month with no card, and usage beyond that is billed per product. Supabase's free tier is a pausable 500 MB database, and the first paid step is Pro at $25 a month.
Supabase if you do not have a database yet, because the app cannot run without one. PostHog shortly after, because the free tier is the cheapest way to see whether your onboarding works. They solve different problems, so the order is about what you are missing, not which is better.
Only partially. PostHog builds dashboards over events and imported tables; Supabase shows database charts and logs in its own dashboard. For product questions - funnels, retention, replay - PostHog is the one with the query library.
Both offer pieces of it. PostHog ships AI observability, an MCP server and a context warehouse aimed at agents querying your product data. Supabase provides pgvector for storing and searching embeddings. They solve different halves: measuring AI usage versus storing vectors.
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