⚡Speed score
LCP
CLS
INP
On mobilePass
Mobile UX designThumb-friendly design that’s smooth and easy on the go.
iOS & Android mobile app development services
A mobile app
that puts you in your customers’ hands
Your customers live on their phones, you need a polished, trustworthy app? Siri9 designs and builds custom iOS & Android apps and gets them on the stores.
From retail apps to internal tools, we build them all
Retail / e-commerce appBooking appMembership / loyalty appInternal business appDelivery / logistics appContent / media appDevice / IoT app
Your customers are on mobile, you aren’t yet
No app of your own
Competitors have handy apps; you only have a site that’s clunky on phones.
iOS & Android are hard
Two platforms, store processes, maintenance, DIY is exhausting.
Hard to connect to systems
The app must connect to data, login and payments. With no one to build it.
A complete app on both platforms
Siri9 designs and builds iOS and Android apps from one codebase, publishes them to the App Store and Google Play, and operates them after launch.
siri9.ioLive
99.98%uptime · 30 days
Avg response32ms
Build iOS & AndroidDevelop for both platforms with reliable performance.
⏱Expiry tracking
Domain214 d
SSL certificate61 d
Hosting140 d
Reminder30 · 14 · 7
Backend & API integrationWire up data, login, payments and existing systems.
Ticket queue
09:12Ticket #182 · resolved✓
11:40Ticket #183 · quoted✓
14:05Ticket #184 · in progress…
This month12 tickets · on time
Push notificationsRetain users with timely, targeted push notifications.
⛨Security scan4 patched
Attacks blocked128
Store submissionPrepare assets and publish to the App Store & Google Play.
↺Automatic backups
Last runtoday · 03:00
RestoreOne click
Handover & supportHand over source, store accounts and post-launch support.
On the stores, runs smooth, and yours
Both OSes
iOS and Android from one project
Published
We help pass store review
Smooth
Optimized, lag-free performance
Handover
Source and accounts are yours
From idea to app on the stores
1
Week 1Brief & design
Siri9 does:Define features and audience; design screens & flows.
You prepare:Describe the idea, desired features and references.
2
Week 2Approve & plan
Siri9 does:Lock design and scope, plan the build in cycles.
You prepare:Approve the design and scope.
3
Per projectBuild & test
Siri9 does:Build features, integrate, test on real devices in cycles.
You prepare:Try the beta & give feedback.
4
ReleasePublish & hand over
Siri9 does:Pass review, release, hand over source & accounts.
You prepare:Provide Apple/Google accounts or let Siri9 handle it.
By project, clear before we start
Priced by FEATURE count and COMPLEXITY (platforms, integrations, custom design). You get a package quote after a chat and can split it into phases.
After launch, Siri9 can operate and update the app (see Software management).
What is mobile app development?
Mobile app development means designing and building a custom iOS and Android app for your business and publishing it to the App Store and Google Play. Siri9 delivers end to end and operates it after launch.
iOS and Android together?
Yes, we build for both from one project to save cost and time.
What about Apple/Google accounts?
If you don’t have them, we guide setup or help publish on your behalf.
Can the app connect to my systems?
Yes, we integrate via API with your data, login and payments.
What about future updates?
You can update it, or Siri9 maintains and evolves it under a plan.
How much does a mobile app cost?
An iOS and Android app from one codebase starts around 60 million VND for the first version, depending on features. Fixed quote per scope.
How long does an app take?
8 to 14 weeks including design, development, testing and publishing to the App Store and Google Play.
What accounts do I need to publish?
An Apple Developer account (99 USD/year) and Google Play Console (25 USD one-off), in your company's name. Siri9 guides the setup.
How are updates handled after launch?
Through the Mobile app maintenance plan at 4,000,000 VND/month: OS updates, bug fixes, backend monitoring; new features quoted separately.
Ready for an app of your own?
Book a chat, Siri9 advises features and quotes within 24 hours.
No commitment · Reply within 24 hours