It is necessary to develop a mobile application for Android and iOS.

Budget: 25000 EUR Deadline: 45 days

Vlad, for such an AI messenger, I would suggest Flutter: one codebase for Android and iOS, quick launch, native integrations for WebSockets, WebRTC, push notifications, camera, files, and chat history. I have 7 years in mobile development and experience in team development of similar applications with chat, authorization, and real-time exchange. I will send exact timelines, estimates, and examples of relevant projects after clarifying the details of the API and communication scenarios.

Budget: 25000 EUR Deadline: 45 days

I suggest doing it on Flutter - one codebase for Android and iOS, proper support for chat, files, camera, push notifications, WebSockets, and WebRTC without splitting the budget between two native teams.

!!Preliminary estimate!! - 280,000 UAH and 45 working days, provided that the server part, API documentation, WebSocket events, and WebRTC signaling are already ready. Note, there is a nuance - voice through WebRTC needs to be checked separately, because that’s where engineering accounting often comes into play instead of magic =)

The timeline can be broken down into stages - authorization and assistant list, chat and history, files and camera, push notifications, voice, testing, and publication. In terms of architecture, I would lay out a separate layer for API integration, connection state handling, message sending queue during poor network conditions, and proper storage of history on the device.

From you, I need access to API documentation, test accounts, description of WebSocket events, WebRTC parameters - STUN or TURN, push notification keys, Google Play and App Store accounts, as well as screen mockups, if they are already available.

> Is there a ready design for the screens or do we need to create a working interface from our side?
> Is WebRTC signaling and TURN already implemented on your server side?

Similar cases by Ingello
> https://business.ingello.com/fractal - AI and agent logic in the product system
> https://business.ingello.com/tts - voice scenarios and sound processing
> https://business.ingello.com/vorfahr - complex SaaS logic and integrations

Main page for system development - https://systems-fl.ingello.com Expand

Budget: 1000 EUR Deadline: 14 days

Hello, Vlad!

We are Stellar Logic and we would be happy to help with the development of your application.

Based on the current description, it is difficult to suggest an optimal stack, as well as to accurately estimate the timeline and cost. For this, we would like to learn more about the project, the API documentation, the design, and any additional requirements.

If you can share a more detailed technical specification or access to the documentation, we will quickly review the materials and propose an optimal solution with an estimate of the timeline and budget.

We look forward to discussing the details!

Budget: 200 EUR Deadline: 1 day

Hello!

We can develop a mobile application for you with integration into an existing Backend and API.

1. Do you have a design, API documentation, and scenarios for key screens?
2. What is important to include in the first version: chat, WebRTC, WebSockets, or push notifications?

—
About us

We are dZENcode – a full-cycle IT development company: from design and programming to integrations and post-release support of digital solutions. We create projects from scratch, as well as connect to existing solutions that need refinement, development, or technical support.

You can find detailed information about our services and rates on our official website: Freelancehunt

Take a look – after that we can discuss the details and agree on the next steps.

⚠️ After clarifying all the details, we will determine the scope of work, the suitable format of cooperation: task-based, outsourcing, or outstaffing – and the final cost.

With us, projects are guaranteed to reach release:
• 10+ years providing IT services;
• 90+ in-house specialists;
• 250+ public reviews since 2015;
• We support products under SLA after launch;
• We work under NDA and contract with the company! Expand

Budget: 10000 EUR Deadline: 60 days

📌Hello.👋
⭐️My name is Andrey.
⭐️My work experience: 12 years+

• ➡️I can show works specifically related to a mobile messaging application
• 🎨Portfolio: Freelancehunt
• ✅Work rating on Behance (over 600,000 views)
• 💼More works here: Dribbble

Budget: 1000 EUR Deadline: 10 days

I have been working in mobile application development for over 5 years. I use modern Flutter technology for cross-platform development. I can implement functionality for Android and iOS according to your requirements. I charge $15/hour.

If there is more detailed information about the project, please write.

Budget: 2000 EUR Deadline: 7 days

Hello, I worked on ChatApp for a startup — a messenger with an AI assistant, WebSockets, push notifications, and file sending. We reached over 10,000 users in the first month after launch.

Technology: Flutter (one codebase for Android and iOS) + integration with your existing API/Backend, WebSockets, and WebRTC for voice communication.

Vlade, please let me know — does the API already have documentation (Swagger/Postman), or will we need to figure out the endpoints during the process? This significantly affects the speed of integration.

I suggest we connect; I will provide you with free technical consultation and we can create a development plan + I will tell you about my team!

Budget: 5000 EUR Deadline: 30 days

Ready to develop a cross-platform application for iOS and Android with integration of your Backend and API. I recommend implementation on Flutter — this will allow for a single codebase for both platforms, high performance, and faster development. I will implement authentication, a list of AI assistants, a chat with WebSocket support, voice communication via WebRTC, file and photo uploads, push notifications, chat history, and full integration with your API.

Budget: 400 EUR Deadline: 7 days

Hello, since the application needs to be quite fast, with both chat and voice communication, it might be worth writing the application using Kotlin/Swift. I'm pretty good at them and familiar with the nuances, ready to collaborate.

Budget: 1500 EUR Deadline: 30 days

Hello! I am ready to develop a mobile application for iOS and Android using Flutter with a single codebase. I have experience in developing commercial mobile applications, integrating REST API, WebSocket, WebRTC/LiveKit, Firebase Push Notifications, cameras, file uploads, and AI chats. I pay attention not only to the implementation of functionality but also to the stability of the application, error handling, and ease of further support. The preliminary cost of development is around €1500. The estimated timeframe is 1–2 months. I can provide an exact estimate after reviewing the design, technical specifications, and API documentation. I will also create a development plan with the main stages. I will provide examples of projects in private messages. For any questions, please contact me in private messages.

Budget: 5000 EUR Deadline: 30 days

Hello. My name is Alexey, and I represent a group of developers – NC-1. For over five years, we have been creating websites, mobile applications, online stores, ERP/CRM systems, and other e-commerce products.
In our team, we have a flutter developer, a senior with the necessary experience and knowledge for you. His commercial development experience is over 7 years.
Preliminary cost and timeline: 4,400 EUR, 30 working days.
Flutter applications he has developed:
https://apps.apple.com/ru/app/m10-%D1%86%D0%B8%D1%84%D1%80%D0%BE%D0%B2%D0%BE%D0%B9-%D0%BA%D0%BE%D1%88%D0%B5%D0%BB%D0%B5%D0%BA/id1642308007
https://play.google.com/store/apps/details?id=com.inilabs.foodking.kds
https://play.google.com/store/apps/details?id=com.inilabs.foodking.kiosk
https://play.google.com/store/apps/details?id=com.inilabs.storeking.customer
https://play.google.com/store/apps/details?id=com.inilabs.tiffinking.customer
https://play.google.com/store/apps/details?id=com.onevoiplanet.onephone
Best regards, Alexey M. Expand

Budget: 200 EUR Deadline: 10 days

Good day! I am happy to implement your project. I am ready to offer the shortest timelines and the most advantageous price without compromising quality.

Technology: I propose to develop the application using Flutter. This is a top cross-platform solution that will allow creating one quality code for both Android and iOS at once. This significantly saves your budget and ensures excellent performance of real-time chats (WebSockets/WebRTC).

Cost: $200 — I offer the lowest price on the market.

Timeline: 10 days. I will complete the work as quickly as possible since your Backend and API are already ready — only integration and interface creation remain.

Budget: 100 EUR Deadline: 1 day

Good morning, I can prepare a mobile application for Android and iOS, functioning as a communicator with your AL, based on an existing backend and API.

Budget: 3500 EUR Deadline: 40 days

Hello! I have extensive experience in developing cross-platform applications and integrating AI/WebSockets/WebRTC systems. !!!I am in the TOP-10 on this platform for mobile application development!!!

I offer to implement the project in Flutter or React Native, which will ensure native speed, real-time WebSockets/WebRTC functionality, and one codebase for iOS & Android, saving budget.
Cost - from 3,500 EUR
Timeline - 4–7 weeks - depending on functionality

My experience and portfolio: https://www.kisolid.com/uk/portfolio
I am ready to discuss the API and start promptly!

Budget: 2200 EUR Deadline: 42 days

Hi Vlad,

Messenger on top of your ready API, I build this on React Native. One codebase for iOS and Android, and WebSockets, WebRTC, push, and camera all run natively through mature libraries, no performance compromise versus Flutter.

How I'd implement each piece:
- auth + assistant list + chat against your API
- real-time dialogue over WebSockets, with a send queue and reconnect so messages survive poor network
- voice via WebRTC (react-native-webrtc). This is the one item to verify early, it depends on your signaling and STUN/TURN setup, not just client code
- photo/file upload and in-app camera capture (vision-camera + document picker)
- push notifications via FCM (Android) and APNs (iOS)
- local dialogue history with offline caching
- clean release to both App Store and Google Play

Architecture: a dedicated API/integration layer, connection-state handling, and on-device history storage, so the app stays responsive and reliable, not just a thin API wrapper.

My background is full-stack + AI integration, so the AI-chat and real-time side is core to me, not new territory.

36 projects on Freelancehunt, all completed 100%, 10/10 rating.

Timeline: ~6 weeks. Core (auth, assistants, chat, WebSockets, media, camera, push, history) first, then WebRTC voice and store release. Cost: €2200 for the full scope, confirmed against your API docs.

One question to scope it precisely: is there a ready design/Figma for the screens, and for WebRTC voice, do you already have signaling and STUN/TURN in place (or should I plan that in)?

Revaz Expand

Budget: 800 EUR Deadline: 25 days

I will do it on Flutter - I have development experience, let's have the technical specifications and design.

Budget: 25000 EUR Deadline: 35 days

There is a practically ready database for such an AI messenger, it can be quickly adapted to your API and released for Android and iOS. ))

I suggest using Flutter - one codebase for both platforms, it adequately handles chat, webSockets, webRTC, push notifications, camera, files, and authentication.

In terms of estimation - starting from 220,000 UAH and about 35 working days for the first stable version with integration, testing, and builds.

For similar tasks:
> https://business.ingello.com/vorfahr - AI automation and working with assistants
> https://business.ingello.com/fractal - complex agent logic and system architecture
> https://systems-fl.ingello.com - main profile of Ingello Systems for AI and automation projects

I see the implementation like this - first, we build the mobile framework, authentication, and the list of assistants, then real-time chat, files, and camera, after that voice through webRTC, push, and final polishing of builds.

From you, we will need API documentation, test access, authentication scenarios, Firebase and Apple push parameters, as well as data on webRTC - signaling, stun, and turn.

Note, there is a nuance - webRTC often looks simple on paper, but then suddenly remembers that it is webRTC =/

I would like to clarify 2 points:
> Is the webRTC signaling and turn server already set up on your side or does that also need to be connected?
> Is the screen design already available or do we need to create the application interface on our side?

Overall, it's fine, we can start with a short design and prototyping phase to avoid unnecessary complexity. Expand

Budget: 1500 EUR Deadline: 30 days

The task is clear, I have done something similar. I suggest Flutter — one codebase for Android and iOS, faster and cheaper to maintain. Chat — WebSockets, voice — WebRTC (flutter_webrtc), camera/files, push via FCM, history — all on top of your API.

For an accurate estimate, I need documentation on the API and a description of signaling for WebRTC — this greatly affects the labor intensity of the voice feature. I am ready to discuss.

Budget: 1000 EUR Deadline: 14 days

Hello, I read about the messenger for interacting with AI based on your API. I fully understand how to set up authorization and chat with WebSockets for your iOS/Android clients. The focus will be on the stable operation of the chat and a user-friendly UI for dialogues, so that users can communicate as easily as possible with assistants, using your backend as a foundation. Could you let me know if any media transmission is planned in the chat, besides text, or is it currently only text messages with AI? I would be happy to discuss the details to assess the timeline and cost.

Budget: 2000 EUR Deadline: 1 day

Hello, I have experience in developing applications using Expo React Native and working with WebRTC.
The completion time is approximately 1.5 months, depending on the design and backend documentation.
The cost starts from 2 thousand dollars; to provide an accurate estimate, I need to receive all the details.
I will send examples in private messages.
I would be happy to help you!

Budget: 500 EUR Deadline: 1 day

Hello! I propose to develop your mobile application on Flutter or Native (Swift for iOS / Kotlin for Android) with integration of a ready-made Backend/API.

I am ready to review the API documentation and discuss the details. I look forward to collaborating!

Budget: 400 EUR Deadline: 10 days

Good day. We can work through secure work, I am ready to do everything in Flutter. In terms of deadlines, 10 working days, or possibly faster.

Budget: 3000 EUR Deadline: 30 days

Good day!
I am ready to develop a mobile messenger with AI for Android and iOS based on your existing Backend and API.
Proposed technology:
Flutter (cross-platform development) — the best choice for fast and high-quality implementation with a single codebase for both platforms.
Main functionality to be implemented:

- Authorization (email, phone, social networks)
- List of AI assistants
- Real-time chat with WebSockets support
- Voice communication via WebRTC
- Sending text, photos, files + camera capture
- Push notifications (Firebase)
- Chat history
- Modern and user-friendly interface

Examples of similar projects:
AI chat messenger with voice communication
→ https://pi.ai (Pi — personal AI assistant with chat and voice)
Mobile AI messenger
→ https://www.character.ai (Character.AI — popular AI chat with many assistants)
Flutter + WebRTC + real-time chat — several commercial projects

Deadline: 6–8 weeks (delivery in stages with testing)

I am ready to sign an NDA, work in stages, and provide regular demo versions.
To start, I need:
- API documentation (Swagger / Postman)
- Examples of desired design (if available)
- Technical requirements for authorization

We will discuss the details and start working soon.
Best regards, Expand

Budget: 1000 EUR Deadline: 14 days

Hello!

I can develop a mobile application for you using React Native.
I can send examples of similar projects.

I suggest we discuss the details in private messages.

Budget: 3000 EUR Deadline: 30 days

Hello!

You are developing an AI messenger for iOS and Android and are looking for a developer for the client side on top of an already ready API.

In mobile development, I specialize in complex client-server applications. I have closely implemented similar mechanics (pure real-time via WebSockets, push notifications, media uploads, event-driven architecture) in a B2B access control system (RPS in my portfolio https://freelancehunt.com/showcase/work/rps/895019.html), where sockets are critical for instant monitoring, as well as in a taxi aggregator (iQTaxi.by) and delivery (Qwqer.lv). In all cases, I built reliable mobile clients with state caching, local databases, and complex UI.

Considering that you need two platforms at once, I recommend implementing the application in React Native. This will provide a single codebase, speed up the release, and WebSockets and WebRTC work natively there without performance loss (through excellent bridges).

Estimation and timeline: based on my experience, a stable implementation of such a messenger (considering WebRTC and push notifications) will take 150–200 hours (~1-1.5 months). More accurately - after clarifying all the details, studying the API documentation, and subsequently drafting the technical specifications.

One clarifying question: do you already have the infrastructure set up for WebRTC (signaling server, STUN/TURN), or is its setup also included in the scope of the mobile client?

I suggest discussing the details and agreeing on the final budget in private correspondence. I am ready to work through Safe. Expand

Budget: 400 EUR Deadline: 5 days

I will do it only for iOS. It will work easily, it won't overload the phone.

Budget: 850 EUR Deadline: 25 days

Good day, I will do it in React Native. It fits perfectly with your tasks. I have a mobile application in development, already in the final testing phase.

Budget: 900 EUR Deadline: 14 days

Hello! I am implementing on Flutter - one codebase for Android and iOS, optimal for a messenger with WebSockets, WebRTC, and push notifications. The backend and API are already ready - the main task is UI + integration. Is there API documentation (Swagger/Postman)? This affects the exact deadlines. The cost is 900 EUR, the term is 14 days.

Budget: 1000 EUR Deadline: 20 days

Good day, I am ready to complete it. The price is 1000 euros. I will do it in React Native.

Budget: 25 EUR Deadline: 7 days

Hello! I am engaged in Flutter development for iOS and Android, ranking in the top 10 in the field of hybrid mobile applications on freelance platforms. I have experience in both independent app development from scratch to release and working in commercial companies. I have also published applications in the App Store and Google Play - from preparation to full release. There are confirmations in the reviews.

Upon request, I can provide my CV, which details the companies I have worked for and what I specifically did in mobile development.

In order to provide you with the cost and timelines, I need to see the design, screens, and a more detailed technical specification.

Budget: 2000 EUR Deadline: 14 days

Hello! I am ready to complete your task, I have extensive experience in UI/UX design.

The price for 1 block ranges from $60 to $110 (depends on the format of the website you choose)
* includes the design development of the first block in two concepts to choose from
* includes preparation of the layout for PC/mobile versions
* includes 3 free iterations of revisions

Layout: from $70 to $125 (depends on the format of the website you choose)
* includes the development of a feedback form
* includes hosting and admin panel setup

I am ready to discuss your budget here and come up with the best option for you.

Portfolio: Behance

Examples of websites:
creotivity-tm.com.ua/the-one
creotivity-tm.com.ua/oak-yard
https://creotivity-tm.com.ua/car4soul/
https://creotivity-tm.com.ua/fidelity-office/
https://creotivity-tm.com.ua/skylead/

Write to me — we will discuss the details. Expand

Budget: 2000 EUR Deadline: 10 days

Hello! Our team specializes in mobile application development. We have experience in developing applications with AI integration. For example, https://apps.apple.com/ua/app/gptalk-ai-chat-bot/id6469514798?l=uk It would be interesting to participate in your project. To provide an estimate, could we review the application design and API?