How to Build an App Like Telegram: The Engineering Playbook

Most founders who say they want to build "an app like Telegram" are not trying to compete with Telegram globally. They are building a secure communication tool for a specific industry, a community platform for a niche audience, or an internal coordination layer for a distributed team. Telegram's generic model creates friction for all of them. HIPAA-covered healthcare teams cannot use a consumer app for patient coordination. Enterprise compliance teams need audit trails Telegram does not provide. Niche communities need moderation controls the public platform does not expose.

The build cost and timeline depend on which of Telegram's three products you actually need.

Monthly operating costs after launch run $3K-$10K for a 10K-50K active user base, scaling with message volume and media storage.

What Telegram actually is

Telegram hit 900 million monthly active users in 2024. According to data.ai's 2024 State of Mobile report, it ranked as the fifth most-downloaded app globally. Most people think of it as "WhatsApp but more private." That undersells it. Telegram is three distinct products sharing one codebase:

Personal messaging. 1-on-1 and small group chats with cloud-based message storage. Unlike WhatsApp, messages live on Telegram's servers, not your device. Every device you log into shows your full message history immediately.

Channels. One-to-many broadcasting. A single account publishes to an unlimited subscriber list. No replies, no group dynamics. Pure broadcast. This is closer to a newsletter platform than a messaging app.

Bots. Programmable agents that respond to commands and messages. The Bot API turned Telegram into a development platform. Teams build everything from customer support bots to full e-commerce flows inside Telegram.

When you say you want to build "an app like Telegram," you need to decide which of these three products you are actually building. The cost difference between them is significant. Building the messaging core alone costs $30K-$60K. Adding channels and a bot API pushes you past $140K.

How Telegram makes money (and how your product will)

Telegram ran for almost a decade without meaningful revenue. Pavel Durov funded it personally until 2021, when the company introduced a premium subscription at $4.99/month. According to Business of Apps research from 2024, Telegram Premium reached approximately 4 million paying subscribers by mid-2024, representing less than 0.5% of the user base. The platform still generates most of its value from scale and network effects, not per-user payments.

For a custom communication platform, you have cleaner monetization paths:

Per-seat SaaS. Charge teams a monthly per-user fee for the platform. $10-$25 per seat per month is standard for workplace tools. At 500 seats that is $5K-$12.5K in monthly recurring revenue.

Platform fee on bot transactions. If your product includes automation or commerce inside the messaging layer, take 1-3% on transactions or charge a per-message fee for high-volume bots.

API access tiers. Enterprise clients often want higher rate limits, data retention guarantees, or compliance exports. Charge for those as an API tier above the standard plan.

White-label licensing. If you are building a messaging infrastructure product, licensing it to other companies at $500-$2,000/month per instance is viable.

The unit economics matter most at the hosting layer. Cloud messaging costs scale with active connections, message volume, and media storage. A 10K-user platform with average engagement costs $3K-$5K/month to operate. At 100K users, expect $15K-$30K/month. Plan your pricing to cover those costs before you are 12 months in.

Who builds a messaging platform instead of using Telegram

Healthcare and clinical teams. HIPAA prohibits using consumer messaging apps for patient information. A healthcare network that needs care coordination, patient messaging, or clinical team communication needs a BAA-covered platform with audit logs and access controls. Telegram is not eligible. Building a custom platform costs $90K-$160K but eliminates ongoing HIPAA risk.

Enterprise compliance-regulated businesses. Financial services, legal, and government teams need message archiving, eDiscovery export, and role-based visibility for managers. Telegram provides none of that. A financial services firm that needs to log and search communications for regulatory review pays $60K-$110K once versus $10-$20 per seat per month for a commercial compliance messaging platform.

Community operators who need revenue from messaging. A creator with 50,000 followers who wants a paid community channel where subscribers get direct access cannot monetize on Telegram itself. Building a dedicated platform where subscriptions, gating, and payments are native features costs $70K-$120K and generates direct revenue instead of building audience on someone else's platform.

Logistics and field service operators. Construction companies, field service teams, and last-mile delivery operations need messaging tightly integrated with job dispatch, location, and task management. Telegram does not integrate with those workflows. A purpose-built coordination tool with messaging as one layer inside a broader operations platform costs $80K-$140K and replaces manual processes that cost more to sustain.

How cloud vs. device storage changes your build (and budget)

This decision affects architecture, cost, and product behavior from day one.

Telegram stores messages in the cloud. WhatsApp stores them on your device. The difference looks minor until you price it out.

Cloud storage means new device login shows full message history instantly, messages survive phone loss, and every device stays in sync automatically. It also means server storage costs grow with every user and every message sent. For 50,000 active users each sending 20 messages per day, you are storing roughly 1 million messages daily. At standard cloud database pricing, that is $200-$500/month in storage alone before any media files.

Device storage avoids those server costs. Messages are gone if the device is wiped. Multi-device sync requires a different protocol entirely.

For business communication tools and community platforms, cloud storage is almost always the right call. Users expect their history when they log into a new device. The cost is manageable at most startup scales.

V1, V2, and V3: what to build and when

V1: launch features ($30K-$60K, 14-18 weeks)

These are the features your platform cannot open without. Every one of them is table stakes for a messaging product.

Cross-platform mobile (iOS and Android from one codebase) saves $30K-$50K versus building native apps separately. This is the right call unless you have a specific performance reason to go native.

V2: growth features ($40K-$80K added, 8-14 weeks)

Add these after you have proven the messaging loop works and users are active.

V3: scale features ($80K-$150K added, when warranted)

These are only worth building once you have significant, proven usage.

Build vs. Telegram: when does custom win?

Keep using Telegram when your users are already on it, your use case is standard communication with no compliance requirements, and you do not need to monetize the platform itself. Telegram is free, has 900 million users, and is genuinely good. Competing with it on features is the wrong goal.

Build your own when:

• Your industry has compliance requirements (HIPAA, SOC 2, FCA) that Telegram does not meet and cannot meet.

• You need messaging integrated with your existing product data (job dispatch, patient records, booking system) and Telegram's Bot API is not sufficient.

• You want to monetize the communication layer directly through subscriptions, gating, or per-seat pricing.

• Your organization needs audit trails, message export, or admin visibility over user communications.

• Your users need a branded, white-labeled experience that builds your product identity rather than Telegram's.

The payback period for a custom build at the enterprise level is typically 18-36 months against comparable SaaS alternatives. For regulated industries where commercial messaging tools carry compliance risk, the payback is immediate.

The encryption decision

"The design space for secure messaging is surprisingly narrow once you accept the threat model. Most people don't need end-to-end encryption. They need encryption in transit and at rest, with strong access controls. Those are not the same thing, and conflating them leads to overbuilt products."

Matthew Green, Associate Professor of Cryptography at Johns Hopkins University, on practical encryption design for communication systems

The Signal Protocol, developed by Open Whisper Systems, is the standard for E2E encrypted messaging. It underpins WhatsApp, Signal, and many enterprise tools. Building it takes 4-8 weeks with experienced engineers.

Telegram's Secret Chats use full client-side encryption. Regular Telegram chats, including all group chats, use server-side encryption. Messages are encrypted in transit (TLS) and at rest, but Telegram's servers can technically read them. This is a deliberate product choice that enables cloud storage and multi-device sync.

For your v1: TLS in transit plus AES-256 encryption at rest covers most business use cases. True E2E encryption requires per-conversation key pairs, key exchange protocols, and key storage that cannot be server-side. That adds 4-8 weeks and $30K-$50K.

Build E2E encryption in v1 only if your use case demands it: healthcare (HIPAA), legal, financial services, or any regulatory context that requires it.

Where messaging builds go over budget

The failure mode we see most often in messaging platform builds is underestimating the delivery guarantee layer. Teams spend 60% of their budgeted real-time engineering time on the edge cases: what happens when a recipient is offline for 72 hours and reconnects, what happens when the same user is on three devices simultaneously, and what happens when a group message needs to fan out to 50 recipients across different server instances. None of these edge cases are obvious from the product spec. They surface in QA.

Teams that treat delivery guarantees as obvious add 3-4 weeks to the timeline mid-sprint. Teams that design the offline queue, the acknowledgment protocol, and the multi-device sync state machine before writing a single line of real-time code ship on schedule.

Real-time presence ("online" / "last seen" status) is the second consistent underestimate. Each server instance only knows about clients connected to it. When user A opens a chat with user B, and they are connected to different server instances, server A needs to query server B in real time. At MVP scale, Redis handles this as a shared presence store. Teams that do not design for this upfront add $15K-$25K in rework when they scale past a single server instance.

According to Statista's 2024 messaging market report, over 3.1 billion people used a mobile messaging app at least once per month in 2023. The market is large. The engineering tolerance for broken delivery is near zero. Users abandon messaging products within days of a bad experience.

Media storage is the third budget surprise. Users send full-resolution photos. Delivering them at full resolution to every recipient wastes bandwidth and money. Server-side compression at upload time, multiple resolution variants (thumbnail, preview, full), and CDN delivery from the closest edge node are not optional features. They are operating cost controls. Teams that skip this in v1 pay $500-$2,000/month more in bandwidth costs at 20K active users, and they pay again to retrofit compression later.

What specific company types build this

Enterprise secure communications. Teams with security requirements who cannot use consumer apps. On-premises deployment becomes a product differentiator in defense, government, and financial services.

Field team coordination. Construction, logistics, and healthcare field workers who need group channels for shift updates, 1-on-1 for coordination, and integrations for job dispatch. A Telegram-style interface where the data model connects to existing operations software, not a standalone app.

Customer service automation. A bot-first product where users interact with automated workflows and escalate to human agents. The messaging interface is the product. The goal is reducing support headcount, not replacing a consumer app.

Community management. Topic-organized groups, announcement channels, and moderated discussions for creators, professional associations, or niche interest groups who want to own their audience and monetize it directly.

How RaftLabs approaches this

When a client says they want to build "a Telegram for their industry," the first questions are product questions, not engineering questions.

Which of the three Telegram products do you actually need? Most clients need the messaging core and nothing else. Some need channels for customer communication. A handful need bot infrastructure for automation.

What is your compliance context? Healthcare and legal clients need E2E encryption or at minimum rigorous access controls and audit logging. Enterprise clients often need SSO, admin visibility, and message export. Consumer apps need neither.

What is the network model? How do users find each other: by phone number, email, username, or through your existing user base? This shapes onboarding entirely and affects your v1 feature list more than any technical decision.

RaftLabs builds messaging infrastructure as part of larger products: field service platforms, healthcare coordination tools, enterprise productivity applications. Book a 30-minute scoping call and we will tell you what your specific build actually requires, which parts of this guide apply to you, and what it realistically costs.