AI app development, from idea to paying users
Rinaztec is an AI app development company that builds web apps, mobile apps and SaaS products with AI at their core, for founders and businesses worldwide. We handle the AI pipeline, the product around it, accounts, billing and launch. Our own shipped products include ArchiCasso AI, which turns a room photo into photoreal redesigns in under thirty seconds with live billing from day one, built end to end in 6 weeks.
- PRICING
- Fixed quote
- TIMELINE
- 5-10 weeks
What is AI app development?
AI app development is building software where an AI model does the core job: generating images or text, analysing input, or acting for the user. The model is only part of it. A usable AI app also needs a fast interface, reliable queues for slow AI tasks, cost controls per user, billing that matches usage, and fallbacks when a model provider is slow or down.
AI apps we build
AI SaaS products
Subscription or usage-billed products for a niche, such as AI design tools, writing tools or analysis tools, with accounts, teams and admin.
Generative image and video apps
Apps that create or edit images and video with several models chained together, queued and delivered fast.
AI writing and content tools
Tools that learn a brand or creator's voice and draft, rewrite and schedule content in it.
AI features in mobile apps
iOS and Android apps with AI built in: photo analysis, voice input, assistants and personalised suggestions.
AI-powered internal tools
Apps for your own team that draft, summarise, search and analyse inside the workflow they already use.
What's included
- Product scope focused on the one feature users will pay for
- AI pipeline with model choice, fallbacks and cost limits
- Web app or iOS and Android app
- Accounts, teams and admin panel
- Stripe subscriptions or metered billing
- Analytics and usage tracking
- Deployment, monitoring and full source code handed over
How AI App Development projects run
- 01
Scope (week 1)
We define the core AI feature, the first users and what launch looks like, and agree a fixed price.
- 02
AI pipeline first (weeks 1-3)
We prove the AI part works on real inputs at an acceptable cost before building screens around it.
- 03
Product build (weeks 3-8)
We build the app, accounts and billing, with a preview link and weekly demos throughout.
- 04
Launch
We deploy, set up monitoring and app store listings where needed, and support you through the first users.
How much does it cost to build an AI app?
The cost depends on the AI pipeline, the number of screens and user roles, web only or mobile too, and billing. Building the AI pipeline first means you find out early whether the core idea works at a cost per user that leaves a margin. Model running costs are tracked per user from day one, so pricing is based on real numbers.
Projects we have shipped
ArchiCasso AI
Upload a room photo. Get photoreal redesigns and walkthrough videos in under thirty seconds.
SAAS · 2025TweetInspire
An AI content engine trained on 100,000+ viral tweets that helps creators write in their own voice, ship faster, and grow.
AI SEARCH GROWTH PLATFORM · 2026CrawlUp
CrawlUp helps businesses become easier to find in Google and AI search by finding visibility gaps, creating helpful articles, publishing them to the business website, and tracking whether more people and AI engines discover the brand.
Why businesses choose Rinaztec
In-house engineers
The people on your call are the people writing your code. No outsourcing, no hand-offs.
Preview in week one
A working preview link early and weekly demos, so you always see real progress.
Fixed, honest quotes
You approve the plan and budget before we write code. No surprise invoices.
You own everything
Full source code, accounts in your name, no lock-in and no licence fees to us.
AI App Development questions, answered
How long does it take to build an AI app?
A focused first version usually takes 5 to 10 weeks. ArchiCasso AI went from start to live billing in 6 weeks, and TweetInspire in 5.
Which AI models will my app use?
Whichever do the job best at a sustainable cost. Many apps chain several models, and we keep the code provider-neutral so you can switch as better or cheaper models appear.
How do I stop AI costs eating my margin?
We add per-user limits, caching, queueing and usage-based billing, and track model cost per user so your prices cover it.
Can you build both web and mobile?
Yes. We build web apps and cross-platform iOS and Android apps, which can share one backend.
Do you work with non-technical founders?
Yes. Most of our AI products were built with founders who had the idea and the market, not the code. We explain every decision in plain English.
Who owns the app and code?
You do: all code, model pipelines, accounts and data.
Tell us what you want to build
A free 30-minute call with an engineer. We'll tell you what it takes, what it costs, and whether we're the right fit, even if we're not.