Fastest-Growing Apps: How Threads, ChatGPT and TikTok Reached 100 Million Users

Fastest-Growing Apps: The digital world has witnessed remarkable changes in how quickly new applications attract millions of users. While some platforms take several years to establish a global audience, others achieve extraordinary growth within months or even days.

Social media platforms such as Threads and TikTok, along with artificial intelligence chatbot ChatGPT, have demonstrated how rapidly consumer technology can gain popularity.

Among these platforms, Meta's Threads attracted particular attention when it recorded approximately 100 million sign-ups within just five days of its launch in July 2023.

ChatGPT also experienced extraordinary early adoption, reaching an estimated 100 million monthly active users within approximately two months of its public launch.

TikTok followed a different growth journey, becoming one of the world's most influential short-video platforms through its personalised content recommendations and global expansion.

These examples highlight how technology, user experience and existing digital ecosystems can influence the speed of platform adoption.

Which Apps Reached 100 Million Users the Fastest?

Several widely discussed growth milestones illustrate the rapid expansion of modern digital platforms.

Important: These figures are not directly comparable. Threads' milestone refers to sign-ups, ChatGPT's to estimated monthly active users, and TikTok's historical figure depends on the market, reporting period and measurement used.

Threads: 100 Million Sign-Ups in Just Five Days

Threads, developed by Meta, was launched in July 2023 as a text-based social networking platform.

The application was designed to allow users to share updates, participate in public conversations and connect with other people.

One of its biggest advantages was its integration with Instagram.

Existing Instagram users could create a Threads profile with relatively little effort, making the registration process easier than starting from scratch on an entirely new platform.

This connection provided Threads with immediate access to a large potential audience.

Within approximately five days of launch, the platform crossed 100 million sign-ups.

The milestone made Threads one of the fastest consumer applications to reach such a large registration count.

However, the achievement also raised an important question: how many users would continue using the platform after the initial excitement?

Rapid sign-ups can demonstrate strong initial interest, but long-term success depends on user retention, engagement and the platform's ability to provide ongoing value.

ChatGPT: How Artificial Intelligence Attracted Millions of Users

ChatGPT, developed by OpenAI, became publicly available on November 30, 2022.

Unlike conventional social networking applications, ChatGPT introduced many users to conversational generative artificial intelligence.

People could ask questions, draft emails, summarise information, generate ideas, write computer code and explore different topics through a chat interface.

The simplicity of interacting with AI using everyday language contributed to its popularity.

According to a widely cited UBS analysis published in early 2023, ChatGPT was estimated to have reached approximately 100 million monthly active users in January 2023.

This represented extraordinary adoption for a newly launched consumer AI service.

ChatGPT's growth also encouraged technology companies to accelerate the development of AI-powered products and services.

Generative AI subsequently became an important area of competition across search engines, productivity software, education and business applications.

TikTok: How Short Videos Changed Social Media

TikTok became popular through a different approach.

Rather than focusing primarily on text-based conversations or AI assistance, the platform built its identity around short videos and personalised recommendations.

Its recommendation system helped users discover entertaining content without necessarily following large numbers of accounts.

Creators could reach audiences through music, comedy, tutorials, challenges and other short-form videos.

TikTok's international growth was also supported by its expansion into different markets and its combination with Musical.ly in 2018.

Historical comparisons frequently describe TikTok as reaching the 100-million-user milestone in approximately nine months, although the exact measurement and starting point vary across reports.

Its broader influence is clear from the adoption of short-video formats by competing platforms.

Instagram Reels and YouTube Shorts are examples of how short-form video became an important part of the social media industry.

Why Do Some Apps Grow Faster Than Others?

The success of rapidly growing applications is rarely explained by a single factor.

Several conditions can contribute to faster adoption.

1. Existing User Networks

Applications connected to established platforms can benefit from an existing audience.

Threads demonstrated this advantage through its integration with Instagram.

Users who already had Instagram accounts could join Threads more easily and connect with familiar profiles.

2. A New and Useful Experience

Applications that introduce a distinctive capability can attract attention quickly.

ChatGPT gained popularity because it allowed people to interact with advanced AI through a straightforward conversational interface.

For many users, this represented a new way to access digital assistance.

3. Viral Content and Recommendations

TikTok demonstrated how personalised content recommendations can encourage users to spend time exploring an application.

Entertaining videos can also spread beyond the original platform, attracting new users.

4. Simple Registration and Accessibility

An application that is easy to install and understand has fewer barriers to adoption.

A complicated registration process or confusing interface can discourage potential users.

5. Social Media Attention

News coverage, online discussions and recommendations from existing users can accelerate interest in a new application.

When a platform becomes a major topic of conversation, more people may join to understand why it is attracting attention.

Does Reaching 100 Million Users Guarantee Success?

A large early audience does not automatically guarantee long-term success.

Technology companies must continue improving their services to maintain user interest.

Some people download applications because of curiosity or social media excitement but stop using them after a short period.

Others become regular users because the platform offers ongoing entertainment, communication or practical benefits.

This is why technology analysts distinguish between total registrations, downloads, monthly active users and daily active users.

Each metric measures a different aspect of growth.

A platform with millions of registrations may have a smaller number of people who use it regularly.

Similarly, download figures do not necessarily show how many users remain active.

Threads vs ChatGPT vs TikTok: What Makes Their Growth Different?

Although all three platforms attracted significant attention, their growth stories reflect different consumer needs.

Threads benefited from an established social media network and demand for a text-based discussion platform.

ChatGPT attracted users through the practical capabilities of conversational artificial intelligence.

TikTok gained popularity by making personalised short-video entertainment accessible to a large audience.

These differences show that there is no single formula for building a successful digital platform.

An application can grow through an existing network, an innovative technology or an engaging content experience.

The challenge is converting that initial interest into sustainable usage.

What Can New Technology Companies Learn?

The growth of Threads, ChatGPT and TikTok offers useful lessons for companies developing new digital products.

A successful application should solve a clear problem or provide an experience that users value.

Easy onboarding can help attract new customers, while reliable performance and continuous improvements can encourage them to return.

Companies should also avoid measuring success through registrations alone.

User satisfaction, retention, engagement and financial sustainability are important indicators of long-term performance.

Building a large audience quickly can create opportunities, but it can also introduce challenges involving infrastructure, moderation, privacy and customer support.

Final Update

Threads, ChatGPT and TikTok demonstrate how quickly digital platforms can become widely recognised.

Threads reached approximately 100 million sign-ups within five days, while ChatGPT was estimated to have achieved 100 million monthly active users in about two months.

TikTok followed a different path, helping transform global social media consumption through short-form videos.

The biggest lesson is that attracting users quickly and keeping them engaged are two different achievements.

As new AI tools and social platforms continue to emerge, the competition to attract and retain millions of users is likely to remain an important part of the technology industry.

Note: Growth figures are historical estimates or company-reported milestones. They use different definitions of users and should not be treated as a strictly comparable ranking.