Doubtnut

Explore the story of Doubtnut founders Tanushree Nagori and Aditya Shankar, who built an AI-powered doubt-solving platform that reached millions of students before being acquired by Allen Career Institute in 2023.

Written by TFN Research Desk | covering startups, technology, venture capital, and business strategy

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Quick Facts

Founders	Tanushree Nagori, Aditya Shankar
Education	Both founders – IIT Delhi
Prior Ventures	Co-Founders, Class 21A (offline coaching, launched 2009)
Role	Co-Founder and CEO, Doubtnut (Tanushree Nagori)
Founded	2016
Sector	EdTech

Introduction

Tanushree Nagori and Aditya Shankar, a husband-wife duo and both IIT Delhi graduates, started out running a small offline coaching business, not a tech company. In 2009, they launched Class 21A, tutoring school students in math and science, and it was through the daily grind of fielding student doubts that they spotted a bigger opportunity. (The Digital Yug) In late 2016, that insight became Doubtnut, an AI-powered platform that let students photograph a problem and receive a video explanation in seconds. (The Ken) Doubtnut’s journey from a fast-rising app to a distressed asset became one of Indian edtech’s more sobering cautionary tales. (TechCrunch)

The Doubtnut Story

Before founding Doubtnut, Nagori and Shankar ran Class 21A, where they noticed that even students spending over ₹1 lakh a year on coaching still couldn’t get all their doubts resolved. (YourStory) In mid-2015, while still running their coaching business, the couple tested a simple app that let students photograph their doubts and receive an explanatory video via WhatsApp a few days later. (Forbes India)

That early experiment evolved into Doubtnut, incorporated in 2016 and formally launched as an app in October 2017, initially focused on mathematics for students in classes 6-9 and IIT-JEE aspirants. (YourStory) The platform used AI-based image recognition and natural language processing to match photographed questions against a growing video repository, eventually answering 80-90% of queries automatically. (Forbes India) By keeping the core product free and monetisation secondary, Doubtnut grew into one of India’s most-downloaded education apps, reaching a monthly audience of 32 million students at its peak. (Business Standard)

That scale attracted serious acquisition interest: in mid-2020, BYJU’S reportedly explored acquiring Doubtnut at a valuation of up to $150 million. (TechCrunch) That deal never closed, and as edtech valuations cooled sharply in the years that followed, Doubtnut’s fortunes reversed. In December 2023, Allen Career Institute acquired the company for approximately $10 million, a fraction of the valuation it had once commanded. (TechCrunch)

Business Model

Doubtnut operated primarily as a free, ad-supported doubt-solving platform with secondary monetisation layers:

Revenue Stream	How It Works
Video content and app monetisation	Advertising and platform revenue from its large free user base
Subscription tutoring	Paid access to live tutoring for unresolved queries
B2B licensing	Technology and content partnerships with other education providers

(Sourced from YourStory)

Funding and Acquisition History

Round/Event	Year	Amount	Key Investors
Early funding	2017–2019	Multiple rounds	Sequoia Capital India (Surge), WaterBridge Ventures, Ankit Nagori
Growth round	2020	Undisclosed	Tencent Holdings, Lupa Systems (James Murdoch)
Acquisition	Dec 2023	~$10 million	Acquired by Allen Career Institute

(Sourced from YourStory and TechCrunch)

Overall, Doubtnut raised more than $52 million across its lifetime, but sold to Allen for roughly $10 million, a steep markdown after prior talks with BYJU’S and other investors, including Prosus Ventures, failed to materialise into a deal. (CB Insights; TechCrunch)

Current Status

Doubtnut now operates as part of Allen Career Institute, one of India’s largest test-prep coaching chains, which raised $600 million from Bodhi Tree Systems at a $1.2 billion valuation in 2022. (CB Insights) In its last reported standalone fiscal year before the acquisition, Doubtnut posted revenue of just ₹26.6 crore in FY23, reflecting the profitability challenges that ultimately drove the sale. (BW Disrupt) Allen has stated it plans to integrate Doubtnut’s doubt-resolution technology with its own curriculum, while extending its academic content to Doubtnut’s broader user base as part of a wider push to reach 2.5 crore students by 2028. (Business Standard; Substack)

Doubtnut vs Competitors

Before its acquisition, Doubtnut competed with Brainly, a Poland-based doubt-solving platform, and other AI-driven learning-support apps globally. (CB Insights) Doubtnut’s acquisition by Allen mirrors a broader pattern in Indian edtech, where large offline coaching institutes have acquired distressed digital-first platforms to build combined online-offline offerings.

Key Takeaways

• Tanushree Nagori and Aditya Shankar founded Doubtnut in 2016, building on their earlier offline coaching venture, Class 21A.
• The platform grew to reach 32 million students monthly using AI-based image recognition and video explanations.
• BYJU’S explored acquiring Doubtnut at a $150 million valuation in 2020, but the deal never closed.
• Doubtnut raised over $52 million but was ultimately acquired by Allen Career Institute for approximately $10 million in December 2023.
• The company now operates as part of Allen, which is backed by a $600 million investment from Bodhi Tree Systems.

FAQs

Who founded Doubtnut?
Tanushree Nagori and Aditya Shankar founded Doubtnut in 2016.

Is Doubtnut still an independent company?
No, it was acquired by Allen Career Institute in December 2023 and now operates as part of Allen’s broader platform.

How much funding did Doubtnut raise?
Over $52 million, though it was ultimately acquired for approximately $10 million.

Who were Doubtnut’s competitors?
Brainly and other AI-driven doubt-solving and learning-support platforms globally.

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© The Founder Nation | Written by TFN Research Desk