Power Automate is genuinely powerful for a tool most businesses already own as part of Microsoft 365 - but it's not a replacement for custom software in every situation. Knowing which one actually fits your process avoids both overpaying for a custom build you didn't need, and fighting a low-code tool well past its limits.
What Power Automate Does Well
- Connecting Microsoft 365 apps together - triggering a Teams notification when a SharePoint list item changes, for example
- Simple approval workflows, form-to-email routing, and basic notifications
- Scheduled, repetitive tasks that don't need a dedicated interface
- Fast to build and modify without formal development, genuinely accessible to a reasonably technical staff member
See our guide on Power Automate for small business for more on what it handles well in practice.
Where Power Automate Reaches Its Limits
- Complex business logic - flows with many branching conditions become fragile and difficult to maintain, particularly once the original builder moves on
- A genuine user interface - Power Automate handles background workflow, not a polished front-end for staff or clients to interact with directly
- Heavy data processing or reporting - it's not designed for complex data transformation at scale the way a purpose-built system is
- Reliability at scale - premium connectors, throttling limits, and licensing changes can affect flows that have grown to handle serious volume
- Version control and testing - custom software benefits from proper development practices that low-code tools don't naturally provide
A Practical Way to Decide
Start with Power Automate for anything that's primarily connecting existing Microsoft 365 tools together with straightforward logic - it's fast, low-cost, and genuinely fit for purpose. Move to custom software once the process needs a real interface, handles genuinely complex logic, needs to integrate with systems outside Microsoft 365 in a robust way, or has become critical enough that fragility is a real business risk.
A Middle Ground Worth Knowing About
Microsoft Power Apps sits between the two - more capable of building a proper interface than Power Automate alone, while still lower-cost and faster to build than fully custom software. It's worth considering for processes that need a real interface but don't warrant a ground-up custom build.
Cost Comparison
Power Automate is largely included in existing Microsoft 365 licensing, making it effectively free to start with for most straightforward automation. Custom software carries a genuine project cost - see our guide on how much custom business software costs for realistic ranges - but delivers capability and reliability Power Automate simply isn't designed to provide once a process outgrows it.
Frequently Asked Questions
Does Power Automate cost extra on top of Microsoft 365?
Basic Power Automate use within Microsoft 365 and its own apps (SharePoint, Teams, Outlook) is included with most business licences. Premium connectors to external systems, and higher usage volumes, may require a separate Power Automate licence - worth checking against your specific plan.
Can Power Automate flows be migrated to custom software later if we outgrow them?
Not directly - a Power Automate flow and a custom application are built on fundamentally different foundations. The workflow logic and business rules developed in Power Automate can usually inform a custom build's requirements, but the flow itself isn't a reusable component.
Who typically builds and maintains Power Automate flows in a small business?
Often a reasonably technical staff member with some guidance, since the visual, low-code interface is genuinely accessible without formal development skills. More complex flows, or ones handling sensitive processes, benefit from proper setup by an IT provider to avoid fragile, hard-to-maintain automations.
What's a realistic sign we've outgrown Power Automate for a given process?
When a flow becomes so complex that only one person understands how it works, when it regularly breaks with connector or licensing changes outside your control, or when it needs a genuine user interface rather than just background automation - these are all signs custom software is worth considering instead.
We'll give you an honest read on whether Power Automate genuinely fits your process, or whether it's time to consider something custom-built.
Automation & Power BI →Not sure if Power Automate can handle your process?
Call 0433 087 091 - we'll assess your workflow and recommend the right tool, no obligation.
Get Free Automation AdviceFor related reading, see our guides to Power Automate for small business and how to scope a custom business system.