What PostHog does
PostHog bundles product analytics, session replay, feature flags, experiments and surveys in one open-source platform. Billing is usage-based, and the first million analytics events a month are free, according to the prices PostHog published in October 2026.
Watch out for. PostHog answers what you ask. Funnels, retention and cohorts are there, but someone on the team has to know what to look for, build the analysis and interpret it every week. If nobody does, the data sits still.
What Holdy does
Holdy reads your product's events, composes them into behaviors with your business rules and watches the state of each behavior per account. When something changes it opens the opportunity on its own, with the evidence, the affected accounts and a written action plan. The change reaches the product as an in-product message to the right users or as a draft pull request on GitHub, and Holdy reads the metric again afterwards to show whether it worked. A person still decides: nothing ships without approval.
Criterion by criterion
| Criterion | Holdy | PostHog |
|---|---|---|
| Define behaviors with your product's context | Holdy proposes the composition with a preview; you accept in one click | With setup: actions and cohorts |
| Get opportunities without starting an analysis | Watches every day and opens the opportunity on its own | Signals and reports, in beta |
| Know where an opportunity came from and which accounts need action | Behavior, window, method and affected accounts on each one | Your own analysis, via group analytics |
| Prioritize by business goals and rules | By the goals and rules you declare (active, risk, churn) and what the team already decided | Prioritization stays with the team |
| Get the plan with the reasoning behind it | Plan with the alternatives ruled out and how it will be measured | Reports with suggestions, in beta |
| Ship the change to the product without waiting for a deploy | Through the SDK or a message to the accounts, with a holdout group | With feature flags and experiments the team writes |
| Pull request when the change is code | Reads your repository, with CI and a preview, once the change has helped | With PostHog Code |
| Measure each improvement in money | Against a holdout group, in behavior and in MRR converted or churned | With experiments; revenue via data warehouse |
| Connect revenue per account | Stripe with a read-only key, or through the SDK itself | Through the data warehouse |
| Investigate by chatting, with team memory | Yes, and Holdy remembers what the team taught and decided | Yes, with the AI assistant |
| Use it inside your coding agent | MCP with opportunities, actions and results in money | MCP with analytics data |
| Collect events or connect existing data | npx @holdyapp/install in 2 minutes, or PostHog and Mixpanel connected | SDK and data warehouse |
When to pick PostHog
- Someone on the team builds and reads analyses every week.
- You want feature flags, session replay and experiments in the same tool.
- The budget is zero and your event volume fits the free tier.
When to pick Holdy
- Nobody opens the analytics weekly and product decisions happen on gut feeling.
- You want the finding delivered, with the affected accounts and what to change, without building an analysis.
- You want the change to reach the product, as a hint or question through the SDK, a message by WhatsApp or email, or a pull request on GitHub, and the result measured against a holdout group in conversion and MRR.
Can I use Holdy together with PostHog?
Yes, and it is the most common path. You connect PostHog and Holdy brings in the event history you already collect, so day one already has a sample. From then on, with Holdy's SDK installed, events come only from the SDK and nothing is counted twice.
How Holdy charges
The unit is the active account: each of your customers, company or workspace, with at least one event in the last 30 days counts once, no matter how many people it has. Your team's seats, events and integrations are never charged. Launch is US$29 (BRL 149) a month up to 100 active accounts and Growth is US$99 (BRL 490) a month up to 1,000 active accounts; beyond that, Corporate on request. Free is free, with 5 questions and 3 AI-generated improvements a month. Entry is the Free plan, no card. Plans are at /pricing.
Frequently asked questions
Do I have to replace PostHog with Holdy?
No. Holdy runs on top of PostHog: you connect it, Holdy pulls the history and starts reading your accounts' behavior the same day, with no migration. PostHog keeps doing what it does well, such as feature flags, session replay and the team's analyses. Holdy's SDK is an optional next step, for sessions, flows and changes delivered straight into the product.
What is the main difference between Holdy and PostHog?
The direction of the conversation. In PostHog you ask the question and read the chart. In Holdy the opportunity arrives already open, with the evidence, the affected accounts and the plan, and Holdy reads the result again after the change ships.
How much does Holdy cost compared with PostHog?
PostHog charges by event volume. Holdy charges per active account per month, each of your customers with at least one event in the last 30 days: a company counts as 1 no matter how many people it has, and someone who pays on their own is a personal account, with 10 counting as 1. No charge per event or seat. It starts on Free, no card: 3 improvements and 5 questions a month, with the first 14 days including everything in Growth. Launch is US$29 (BRL 149) a month up to 100 customer companies and Growth is US$99 (BRL 490) up to 1,000; beyond that, Corporate on request.
How does Holdy measure whether the change worked?
Every action leaves part of the accounts out, at random. Holdy compares both groups on the behavior the action targets and, when you send plan, MRR and status per account, on who converted and who churned. A money figure only shows up once the difference holds; before that it shows how many accounts converted in each group and says it can't tell yet.
What if my customer base is small?
The comparison needs a sample. With a few dozen accounts, many readings end in "can't tell yet", and Holdy says so instead of inventing a number. The finding, the opportunity and the plan work from day one; the proof of the result gets stronger as the base grows.
PostHog's prices and modules cited here are the ones the company published in October 2026. Check its website before deciding.