Mobile appmaintenanceservices that keep your app current, stable and in the stores.

Apple, Google and your SDK vendors change something every few months. We keep your iOS and Android apps working through every change, fix what breaks and keep releases moving.
Discuss maintenance

An app left alone doesn't stay the same. It gets worse.

New OS versions change behavior, SDKs get deprecated, store rules tighten and new devices appear. An app nobody maintains slowly collects crashes and bad reviews, then one day an update is rejected. Regular maintenance costs far less than a rescue, and it keeps your users' trust.

What happens when nobody owns app maintenance

01

New OS versions break features

A yearly iOS or Android release changes permissions, background rules or UI behavior, and something stops working.
02

SDKs go out of date

Payment, analytics, ads and login SDKs drop support for old versions, sometimes with little notice.
03

Store updates get blocked

Google Play target API rules or App Store privacy requirements stop your next release until the app is updated.
04

Crashes grow quietly

Without monitoring and triage, small crash spikes turn into a pattern before anyone notices.
05

The product team is busy elsewhere

Your engineers are on new features, so upkeep keeps sliding to the next sprint.
06

The app slows down as it grows

More users, data and features make screens heavier and the backend slower.

Signs your app needs a maintenance partner

If two or more of these are true, the app is drifting.

1

You haven't released in months

The last update shipped long ago and nobody is sure the build still compiles with current tools.

2

You got a store warning

Apple or Google sent a notice about policies, APIs or privacy details you need to update.

3

Crash reports pile up unread

Crash tools collect data, but nobody looks at it or fixes the top issues.

4

The original developers moved on

The agency or freelancer who built the app is no longer available.

5

Reviews mention new bugs

Users report problems after a phone or OS update that you can't reproduce.

6

Growth is straining the app

Traffic is up, and loading times and backend errors are rising with it.

What's included

What our mobile app maintenance covers

OS version updates

Testing and fixes for each new iOS and Android release, ideally before your users install it.

SDK and library updates

Keeping payment, analytics, login and other dependencies current and supported.

Crash monitoring

Watching crash and error reports, ranking issues by impact and fixing the top ones.

Store policy changes

Target API updates, privacy details and listing changes so your updates keep getting approved.

Bug fixing

A steady flow of fixes for reported bugs, prioritized with you.

Performance optimization

Faster startup, smoother screens and lighter network and battery use.

App scaling services

Backend, caching and API work so the app keeps up as users and data grow.

Regular releases

A predictable release rhythm for both stores, with small features alongside fixes.

Three things we keep an eye on

Maintenance work falls into three streams. We plan each month around them.

Compatibility

New iOS and Android versions

New devices and screen sizes

SDK and library deprecations

Build tools and signing

Stability

Crash and error monitoring

Triage by user impact

Fixes for recurring issues

Regression checks before release

Performance and scale

Startup time and screen speed

Memory, battery and data use

Backend response times

Capacity for user growth

Who is this for

Apps that are live and need to stay healthy

Product companies

Your team builds features. We handle OS updates, SDKs and crash work so they don't have to.

SMBs with one app

You don't need a full mobile team, but you need someone reliable to keep the app working.

Startups after launch

The app is live and growing, and the build team has moved on or shrunk.

Owners without a tech team

Your app was built by an agency or freelancer, and you need a partner to look after it.

What do you need most?

Stay compatible

Updates for new OS versions and devices.

Cut crashes

Monitoring and fixes for the top issues.

Keep store approval

Policy and privacy updates on time.

Speed up the app

Performance work on slow screens and APIs.

Prepare for growth

Backend and app changes to handle more users.

Keep shipping

Small features and fixes on a steady rhythm.

How a maintenance engagement starts

01

Intro call

We learn about your app, users, stack and the problems you see today.

02

Health check

We review the code, dependencies, crash data, store status and release setup, and list the risks.

03

Maintenance plan

Together we agree priorities, the monthly scope, how you report issues and response times written into your contract.

04

Stabilize

We fix urgent issues first: blocked updates, top crashes and outdated SDKs.

05

Ongoing care

Monthly updates, monitoring, fixes and releases, with a named point of contact and regular reports.

How we work

Two ways to keep your app healthy

Ongoing maintenance

most popular

Monthly scope agreed with you

Monthly retainer.

For live apps that need steady care and a team that knows them.

OS and SDK updates

Crash monitoring and fixes

Store policy updates

Regular releases to both stores

Named point of contact and reports

Set up maintenance

Audit first

Quick Audit in 3 working days

Fixed price, agreed before we start.

For apps with unclear health or a history of problems.

Crash and stability review

Dependency and SDK risks

Store and policy check

Ranked list of issues

Maintenance plan you can use with any team

Book an audit

Apps we keep shipping

subscription app

Flight Tracker+ — iOS subscription app

USA
Global
59%
growth of active user base
Before
→
after
↓
Rating declining
↑
Revenue €200K → €1.2M in 6 months
↓
Revenue stagnating at €200K
↑
Stable weekly release cadence
↓
Legacy codebase, original team gone
↑
Architecture rebuilt
↓
No clear path to recovery
↑
Clear path for future growth
E-COMMERCE & MARKETPLACE

Flashfood Grocery marketplace

USA
Canada
$247M
SHOPPER SAVINGS
Before
→
after
↓
Rapid scale across 700+ stores
↑
$247M in shopper savings
↓
Mobile reliability under pressure
↑
$16.5M raised
↓
Engineering capacity stretched thin
↑
1,600 stores served
↓
No clear path to recovery
↑
Sustained delivery cadence

Make the most of the experienced team

We are a global team of
creative
and
strategic thinkers
who specialize in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that meet our clients' needs.
We are a global team of
creative
and
strategic thinkers
who specialize
in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that
meet our clients' needs.
Learn more
85%
recurring customers
12M
the biggest fundraising round by one startup
X3 MRR
growth of partner's business in 5 mos
2 weeks
for project start
5+ years
av. partnership duration with SMBs and product companies

Why Gilzor

We stay with apps for years, not just through launch. That long view shapes how we maintain them: fewer patches, more fixes that last.

What we bring

Mobile experience

7+ years building iOS and Android products.

Long partnerships

Average partnership with SMBs and product companies is 5+ years.

Returning clients

85% of our customers come back with new work.

Fast start

Maintenance can start in about two weeks.

Broad skill set

iOS, Android, React Native, backend and QA in one team.

What makes us different

Root causes, not patches

We fix why a crash happens, so it doesn't come back next release.

Ahead of OS releases

We test on new iOS and Android versions before your users get them.

Clear reporting

You see what changed, what we found and what's next.

Speed is part of the job

Performance and scale are part of maintenance, not an extra project.

Overlap with US hours

Our engineers in Europe overlap with part of the US working day.

What our clients
frequently ask

What do mobile app maintenance services include?

OS and SDK updates, crash monitoring and fixes, store policy changes, bug fixing, performance work and regular releases. We agree the exact monthly scope with you.

Can you maintain an app another team built?

Yes, that's common. We start with a health check of the code, dependencies, crash data and release setup, then fix the urgent issues before moving to a regular rhythm.

How do you handle new iOS and Android versions?

We test your app on beta versions when they're available, fix issues ahead of public release and ship updates so most problems are caught before your users update their phones.

How fast do you respond to critical issues?

Response times are agreed in your contract, based on how critical the app is to your business. You also get a named point of contact.

Do we need a separate app performance optimization company?

No. Performance and scaling work can be part of the monthly scope, or a separate project when the app needs a bigger change.

How is maintenance billed?

Usually as a monthly retainer for an agreed scope. If you want a clear picture first, we can start with a fixed-price mobile app audit.

No sales pitch

Tell us about the app you need maintained

Share the app, its stack and what's worrying you. We'll suggest a maintenance plan and how to start.

Next, a few optional questions so the first call is useful. We use your details only to reply to your request. Privacy Policy