Power Apps vs Custom App Development - When to Choose Which
This is the question that comes up in almost every initial conversation we have with clients. "Should we build it in Power Apps or go custom?" The answer is never universal - it depends on the problem, the organisation, and what happens after the app is live.
We build both. We're a Power Apps consultancy and a custom development shop. We have no financial incentive to push you one way or the other. Here's how we think about the decision.
The Honest Case for Power Apps
Power Apps is genuinely good at certain things. Dismissing it as "just a low-code tool" misses the point.
Speed to value: A functional business app in 2-6 weeks instead of 3-6 months. For internal tools where time matters more than polish, this is significant.
Microsoft ecosystem integration: If your business runs on SharePoint, Teams, Outlook, and Dynamics 365, Power Apps connects to all of them natively. No API wrangling, no authentication headaches. It just works.
Citizen developer potential: Business analysts and power users can build and modify simple apps themselves. This isn't a fantasy - we've seen it work in organisations that invest in training and governance.
Lower entry cost: For a simple app serving 20-50 users, Power Apps is typically 40-60% cheaper than custom development. The licensing costs add up over time, but the initial investment is lower.
Built-in security and compliance: Role-based access, audit logging, and data loss prevention policies are available out of the box. For regulated industries, this saves weeks of custom implementation.
The Honest Case for Custom Development
Custom development (React, .NET, mobile native, or similar) has its own strengths that Power Apps can't match.
Performance at scale: Power Apps starts to strain with large datasets, complex calculations, or high concurrent user counts. Custom apps can be optimised for exactly the performance profile you need.
User experience control: Custom development means pixel-perfect control over every interaction. If the app is customer-facing or needs to match specific brand guidelines, custom wins hands down.
Complex business logic: When business rules get complicated - conditional workflows, real-time calculations, complex validation chains - custom code handles it cleanly. In Power Apps, complex logic often turns into unreadable formulas.
No per-user licensing: Once a custom app is built, you're paying for hosting (often $100-$500/month on Azure), not per-user fees. At 500+ users, this economic advantage is substantial.
Full ownership and portability: You own the code. You can host it anywhere. You're not locked into Microsoft's platform decisions or pricing changes.
Integration flexibility: Custom APIs can connect to anything. Power Apps premium connectors cover common systems, but niche or legacy integrations often require custom connector development anyway.
The Decision Framework
Here's the framework we use with clients. Score each factor for your specific project.
Choose Power Apps When
| Factor | Details |
|---|---|
| Users | Internal staff, under 200 active users |
| Data complexity | Simple to moderate data models, under 50 tables |
| Integrations | Primarily Microsoft ecosystem (SharePoint, Dynamics, Teams) |
| UX requirements | Functional is good enough, doesn't need to be beautiful |
| Timeline | Need something working in 2-6 weeks |
| Budget | Under $80,000 for initial build |
| Maintenance | Want business users to handle minor changes |
| Lifespan | 2-5 year expected life, acceptable to rebuild later |
Choose Custom Development When
| Factor | Details |
|---|---|
| Users | External customers, or 200+ internal users |
| Data complexity | Complex data models, large datasets, real-time requirements |
| Integrations | Multiple non-Microsoft systems, legacy APIs, IoT devices |
| UX requirements | Brand-specific design, consumer-grade experience expected |
| Timeline | Can invest 3-6 months for a better long-term outcome |
| Budget | Over $80,000 and want to avoid ongoing per-user licensing |
| Maintenance | Have or plan to hire technical staff |
| Lifespan | 5+ years, core business application |
Real Examples from Our Work
When Power Apps Was the Right Call
Asset inspection app for a facilities management company: 40 field workers needed to complete site inspections on tablets. Data went into SharePoint, triggered Power Automate flows for follow-up actions, and fed into a Power BI dashboard for management.
- Build time: 4 weeks
- Cost: $28,000
- Users: 40 field staff + 8 managers
- Result: Replaced a paper-based process that was costing them 15 hours per week in data entry
Power Apps was right because the data model was simple, integration was all Microsoft, users were internal, and speed mattered. A custom app would have cost $70,000+ and taken 12 weeks for essentially the same outcome.
When Custom Development Was the Right Call
Client portal for a professional services firm: Clients needed to submit documents, track project progress, view invoices, and communicate with their account manager. The portal needed to integrate with the firm's practice management system, accounting system, and document management platform.
- Build time: 14 weeks
- Cost: $145,000
- Users: 2,000+ external clients
- Result: Reduced client support calls by 45%, improved client satisfaction scores
Custom development was right because the users were external (brand experience mattered), the user count made Power Apps licensing expensive ($67,000+ per year), and the integrations were non-Microsoft systems. Building this in Power Apps would have been a constant fight against the platform's limitations.
When We Started With Power Apps and Moved to Custom
Inventory management for a distribution company: Started as a simple stock-tracking app for 15 warehouse staff. Worked well for 18 months. Then they expanded to three warehouses, added barcode scanning, needed real-time stock sync across locations, and wanted customer-facing order tracking.
Power Apps couldn't keep up. Performance degraded with the larger dataset, real-time sync was unreliable, and the customer portal needed a professional look and feel.
We rebuilt it as a custom .NET application with a React frontend. The rebuild cost $120,000 but the company avoided ongoing licensing costs and got the performance they needed.
The lesson: Power Apps was the right choice initially. It proved the concept and delivered value quickly. The migration to custom was planned and justified by changed requirements. Starting with Power Apps wasn't a mistake - it was the pragmatic choice at the time.
The Hybrid Approach
This is what we recommend most often. Use Power Apps where it's strong, custom development where it's needed.
Common hybrid patterns:
- Power Apps for internal tools, custom for customer-facing: Your ops team uses Power Apps for workflow management. Your customers interact with a custom-built portal.
- Power Apps for data capture, custom for processing: Field workers submit data via Power Apps. A custom .NET backend processes it, runs calculations, and generates outputs.
- Power Apps for rapid prototyping, custom for production: Build the first version in Power Apps to validate the concept. If it works, rebuild the core in custom code with confidence that the requirements are right.
We've written about our approach to AI consulting which often involves exactly this kind of hybrid architecture - using the right tool for each layer of the solution.
Common Mistakes We See
Mistake 1 - Choosing Power Apps Because It's "Free"
It's not free. The Microsoft 365 licence includes basic capabilities, but anything useful requires premium licensing. We've seen organisations commit to Power Apps thinking it was covered by their existing licence, then scramble to justify $3,000-$5,000/month in additional licensing once they realise what premium connectors and Dataverse actually cost.
Mistake 2 - Building Enterprise Apps in Power Apps Without Governance
Power Apps makes it easy to create apps. Too easy, sometimes. Without governance, you end up with dozens of unmanaged apps, duplicated data, and no consistent security model. If you're rolling out Power Apps across the organisation, invest in a Centre of Excellence from day one.
Mistake 3 - Choosing Custom Development for Every Problem
Not everything needs a bespoke React application. Internal approval workflows, simple data collection forms, and basic dashboards are exactly what Power Apps was designed for. Over-engineering these with custom development wastes money and time.
Mistake 4 - Not Considering the Total Cost of Ownership
Power Apps has lower build costs but higher ongoing costs (per-user licensing). Custom development has higher build costs but lower ongoing costs (hosting only). Run the five-year TCO calculation before deciding.
| Power Apps | Custom Development | |
|---|---|---|
| Year 1 (build + licensing) | $40,000 | $120,000 |
| Year 2 (licensing + support) | $18,000 | $8,000 |
| Year 3 (licensing + support) | $18,000 | $8,000 |
| Year 4 (licensing + support) | $18,000 | $8,000 |
| Year 5 (licensing + support) | $18,000 | $8,000 |
| 5-year total | $112,000 | $152,000 |
Example based on 100-user mid-complexity app. Your numbers will differ.
In this example, Power Apps is still cheaper over five years. But change the user count to 500 and the custom option pulls ahead by year three.
Mistake 5 - Ignoring the Skills Factor
Who will maintain this app? If your IT team knows .NET and React, custom development maintenance is straightforward. If your team is business analysts comfortable with Power Fx, Power Apps maintenance is easier. Build for the team you have, not the team you wish you had.
Questions to Ask Your Consultant
Whether you're evaluating Power Apps consultants or custom development firms, ask these questions:
- "Can you show me a similar project you've built?" - Experience with your type of problem matters more than general platform expertise.
- "What would you not use Power Apps for?" - If a Power Apps consultant says it's perfect for everything, find another consultant.
- "What's the five-year TCO?" - Anyone who only quotes build cost is giving you half the picture.
- "What happens when we outgrow the platform?" - Migration planning should be part of the initial conversation.
- "Can you build both?" - Consultants who only offer one option will always recommend that option. Work with a team that has broad capabilities and can give unbiased advice.
Where Team 400 Sits
We build Power Apps, custom .NET applications, React frontends, and AI-powered solutions. That breadth means we recommend what's actually best for the project, not what we happen to sell.
Most of our clients end up with some combination. Power Apps for the quick wins, custom development for the core differentiators, and AI and automation layered across both.
If you're stuck on this decision, talk to us. We'll give you an honest assessment in a single conversation - no multi-week discovery engagement required to answer a straightforward question.