Mobile app modernization: renew an existing app safely
Estimate the technical renewal of your current app, clearly separated from ongoing maintenance and greenfield development.
Mobile app modernization costs
Costs for Mobile App Modernization depend on scope, risk, and quality expectations. The calculator provides an initial range.
Sizing costs for Mobile App Modernization
- Binding quotes follow a short scope alignment
- Include operations, maintenance, and potential grants
- Many mid-market digitalization projects may qualify for funding
Transparent quoting
- Milestones and documented assumptions
- Clear exclusions in the quote
- Consulting and development delivered from Germany
We quote transparently with dedicated contacts from East Frisia.
Sample calculations & scenarios
Concrete project profiles with assumptions and indicative budgets—useful for internal alignment before the calculator.
Use the calculator right below for an instant first estimate – no sign-up and no fixed-price commitment. We align scope, risks, and assumptions in a conversation before a binding quote.
Mobile app modernization cost calculator
Modernize an existing mobile app with a controlled migration path
Typical price range
EUR 25,000–180,000 excl. VAT
Typical duration
8–28 weeks depending on codebase and platform scope
Main risk drivers
- - Hidden dependencies in outdated frameworks
- - Missing regression coverage for critical journeys
- - Big-bang migration without a viable rollback path
Non-binding indication
This result is only a non-binding indication based on typical assumptions. Effort and price must be calculated individually for your project.
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FAQ
Mobile app modernization cost and delivery
Technical scope and budget
How much does modernizing an existing mobile app cost?
The estimate combines codebase size, platforms, architecture depth and integrations at EUR 140 per hour excl. VAT. Compatibility upgrades cost less than a full technical renewal with UI work and automated regression coverage.
When should we modernize instead of rebuilding the app?
Modernization is attractive when proven domain logic, backend contracts and user journeys can be retained. A rebuild comparison is sensible when the current code cannot be tested reliably or the product direction has fundamentally changed.
Why does supporting both iOS and Android increase effort?
Both platforms need build, device and store validation even with a shared cross-platform codebase. Shared code reduces duplication but does not remove native edge cases or separate release acceptance.
Boundaries, delivery and outcomes
Does this calculator include ongoing app maintenance?
No. Mobile app modernization is a defined technical renewal project for an existing product. Recurring releases, support and future OS patches belong in a separate maintenance budget.
What deliverables should a modernization project produce?
Typical outcomes include a supported architecture, current frameworks, stable builds, documented migration decisions and verified critical journeys. UI refresh, accessibility and test automation are selectable work packages.
How does Groenewold IT control migration risk?
We deliver in testable increments, protect business-critical journeys and stage store rollouts with fallback options. Engineering is Made in Germany by our team in Leer, East Frisia.
Typical pricing models (overview)
| Model | When it fits | Budget & flexibility | Typical risks |
|---|---|---|---|
| Fixed price (fixed scope) | Clearly defined scope, stable requirements, repeatable delivery. | Predictable total cost; little room for change without a change order. | Scope creep leads to change orders or quality trade-offs. |
| Time & Material | Discovery, legacy, evolving requirements, or close collaboration. | Maximum flexibility; budget transparent via hourly or daily rates. | Without prioritisation, effort can grow—backlog and reviews matter. |
| Retainer / maintenance package | Ongoing operations, updates, small features, and support. | Agreed capacity per month; predictable follow-on cost. | Large changes may still need a separate estimate. |
| Hybrid (milestone + T&M) | MVP or phased releases with clear go-lives, then iterate. | Core delivery fixed price; extensions on a time-and-materials basis. | Define contractually what is in scope vs. extra work. |
Calculators on this page provide indicative ranges; we choose the right model with you based on risk, scope, and planning horizon.
Costs & next steps
The ranges shown are indicative. For a binding quote we discuss scope, priorities and funding options in a free intro call. Many digitalization projects qualify for grants – try our funding calculator.
Browse all cost calculators, explore services and typical solutions. Questions about Mobile App Modernization? Contact us.
After using the Mobile App Modernization calculator, validate assumptions in a short intro call.
What we align in the call
- Scope, risks, and funding options
- Milestones and documented exclusions
- Transparent quote without hidden line items
Costs for Mobile App Modernization in context
- Scope, risk, and quality expectations drive the range
- Include operations, maintenance, and grants
- Dedicated contacts and short paths from East Frisia
Browse all cost calculators in the costs overview.