Zapier works until it does not. When the logic gets complex, the volume gets high, or the tools are not supported — custom automation is the replacement.
You have outgrown Zapier when: your monthly task count is making the bill significant; your workflow requires logic the visual builder cannot express; you need tools Zapier does not integrate with; you need mobile automation; or your Zaps have become so complex they are difficult to maintain.
Replacing Zapier means building the same connections and logic in code that you own. Advantages: unlimited logical complexity; any integrations regardless of library; no per-task pricing; better error handling and monitoring; a management interface built for your specific workflow; and full code ownership.
If you are spending £100+ per month on Zapier, a custom replacement in the £2,000-5,000 range breaks even within 24 months. At £300+ per month, break-even is under 12 months.
Tell us what you need. Fixed-price proposal within 24 hours.