When speaking with clients, one of the most common questions I hear is: Should we use an external analytics tool like PostHog, or should we build and manage our own system in-house?

Both approaches can be useful, but the right choice depends on your stage of growth, your priorities, and how much control you want over your data. Let’s break it down in simple terms.

Using PostHog in the early stages

If you are just starting out and want to test ideas quickly, PostHog is a great option. It is fast to set up, requires little technical effort, and helps you track what users are doing in your application without building a system from scratch.

It is especially helpful if you are experimenting with new features, collecting feedback, or trying to understand which parts of your product people use the most.

Why you might move in-house as you grow

As your product begins to gain traction and scale, things change. Managing analytics in-house often makes more sense because:

• Full control of your data – You decide how long you keep it and where it is stored.
• Flexibility – You can track exactly what matters to your business.
• Reduced dependency – If PostHog has downtime, you are not left without critical insights or functionality.

For example, PostHog has limits on how long data is stored. Even on paid plans, activity data is only kept for around seven years. For many organisations, especially those with long-term users or strict compliance needs, that may not be enough.

The same applies to feature flags and tools

PostHog also offers useful extras like feature flags. These can be helpful in the beginning, but if your system grows, relying too heavily on an external tool can create risks. Running feature flags directly in your own system ensures you are not dependent on someone else’s infrastructure.

What this means for you

If you are early in your journey, start with PostHog. It gives you speed and simplicity. But as your product and team grow, it is wise to plan for the future by moving analytics and feature management into your own database and systems.

Every business is different, so the best choice depends on your needs and growth stage. If you are unsure what approach is right for you, I am happy to help you think it through.

• You can book a free consultation here
• Or simply email us at info@kerelabs.com