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Startup Deep Dive : Doubtnut — offered $150M by Byju’s, sold to Allen for $10M

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The Invincible India Startup Deep Dive featured graphic for Doubtnut.

In December 2023, Allen Career Institute paid about $10 million (₹96 crore at $1 ≈ ₹96.0 as of 18 September 2026, Trading Economics) for an edtech company that Byju’s had once offered somewhere between $125 million and $150 million to buy outright. Doubtnut, the app that let a student in a small town photograph a maths problem and get a video solution back in seconds, had raised more than $50 million from Tencent, Sequoia and James Murdoch’s Lupa Systems along the way.

What happened between the offer and the sale is a fairly ordinary story about an extraordinary user base: tens of millions of students who loved a free product, and a business model that never quite worked out how to charge them. Doubtnut’s decline was not a scandal or a single bad decision. It was a slow-burning mismatch between reach and revenue, and it is worth tracing in detail because so many “free-first” Indian apps are still betting they can fix that mismatch before the money runs out.

Quick facts

Company Doubtnut (legal entity: Class 21A Technologies Private Limited)
Founded Incorporated 2016; app launched October 2017, Gurugram
Founder(s) Tanushree Nagori and Aditya Shankar, IIT Delhi alumni and a husband-wife duo
Businesses AI-assisted photo-to-video doubt solving, live classes, YouTube and WhatsApp content, JEE/NEET and school-board prep, in Hindi and English medium
Latest FY revenue Rs 26.6 crore in FY23, up from Rs 15.2 crore in FY22 (Entrackr, citing RoC filings, April 2023 and March 2023)
Latest FY profit/loss Loss of Rs 179.24 crore in FY22; FY23 loss was not disclosed in the reporting available at the time of writing
Listed Private — not listed on any exchange
Market value / last valuation Acquired for about $10 million (~₹96 crore) in December 2023, down from a reported $125-150 million valuation floated by Byju’s in 2020
Key shareholders or CEO Aditya Shankar, co-founder and CEO; Allen Career Institute has owned the company since December 2023; earlier backers included Sequoia (Peak XV Partners), Tencent, Omidyar Network and WaterBridge Ventures

What they do

Doubtnut sells a doubt-solving service to school and competitive-exam students, most of them preparing for board exams, IIT-JEE or NEET. The core idea has stayed constant since 2017: a student photographs a question they are stuck on, and the app returns a step-by-step video solution, drawing on a large pre-recorded library and, where nothing matches, newly filmed answers. Around that core, Doubtnut layered live online classes, YouTube channels in Hindi and English, and NCERT-aligned study material, aimed squarely at students in small towns who could not afford, or could not access, a coaching institute. As of this writing the company operates as a subsidiary of Allen Career Institute, the Kota-based test-prep group, which acquired it in December 2023.

The origin

Tanushree Nagori and Aditya Shankar met at IIT Delhi and worked in planning and consulting roles in India and the United States before turning to education. In 2009 they started a coaching venture called Class 21A, tutoring students in grades 9 through 12 in maths and science around Gurugram. It worked, in the way most good coaching centres work: one classroom, one batch, one teacher at a time. It also could not scale, and Nagori has said that even families spending over Rs 1 lakh a year on coaching still could not get every doubt answered in time.

The fix they landed on was blunt rather than clever. In mid-2015, while still running Class 21A, the couple built a single-page app that let a student send a photo of a problem and receive a video answer over WhatsApp, sometimes days later. It was slow and manual, but it proved that a photograph of a handwritten question was a viable input, and that a video, not a text answer, was the format students actually wanted. The company was incorporated in 2016 as Class 21A Technologies, and the polished app, rebuilt around an automated question-matching engine, launched in October 2017 under the Doubtnut name. Maths came first, because the founders judged it the subject where students in grades 6 to 9 and in entrance-exam prep got stuck most often — and where a worked video, rather than a one-line answer, actually helped.

The struggle years

Doubtnut’s early growth curve looked enviable. By the end of 2019 it had around 1.1 million daily active users and 2.7 million Google Play downloads, and by January 2020 it was reporting over 13 million monthly active users across app, web, YouTube and WhatsApp, with 85 percent of them outside India’s ten largest cities. Underneath that reach, the company’s own filings tell a harder story.

None of this was hidden. The company’s own numbers, filed with the Registrar of Companies each year, show a business that kept growing its audience while its losses grew faster than its revenue — the definition of a model that has not been found yet.

The turning point

The clearest fork in Doubtnut’s road came in June 2020, when Byju’s — then still raising money at giant valuations and shopping for acquisitions across the smaller-city market Doubtnut had won — entered advanced talks to buy the company for a reported $125-150 million. Byju’s wanted exactly what Doubtnut had built: reach in tier 2 and tier 3 India that its own brand had not cracked. Unacademy had held preliminary talks too, and then dropped out.

The Byju’s deal never closed. Reporting from the time and since points to disagreements over valuation, and Doubtnut continued exploring options with other investors, including Prosus Ventures, without a deal materialising. On one side of that failed negotiation sat a $125-150 million offer at the peak of India’s edtech funding boom. On the other side, three and a half years later, sat a $10 million acquisition price from Allen Career Institute — a decline of roughly 93 percent in headline value, agreed after edtech funding had dried up, after two rounds of layoffs, and after existing investors had to prop up the company with a bridge note rather than fresh capital. The company that walked away from a nine-figure offer in 2020 sold for eight figures in 2023.

The money behind it

What each investor changed: Sequoia backed Doubtnut from its seed stage through the final 2023 bridge note, the one investor present at both ends of the company’s life. Tencent’s Series A cheque, the largest single check at that stage, gave the company its first big war chest and a valuation marker near $50 million. SIG and Lupa Systems doubling the round size in 2021 pushed the valuation past $100 million at a time when Indian edtech funding was near its peak — money that funded the live-classes pivot and the hiring that followed, and that the company’s own FY21-FY22 filings show it burned through faster than it could replace.

How it makes money

Doubtnut’s core doubt-solving tool was always free — the company’s growth strategy depended on a low-friction, no-signup entry point that could spread in towns where a paid app was a hard sell. Money came from what sat around that free core.

The part most outside observers got wrong was assuming a free tool used by tens of millions of students should translate easily into revenue at a similar scale. It did not. Doubtnut’s own numbers show it spent Rs 52.35 to earn one rupee of operating revenue in FY21 and Rs 17.96 to earn one rupee in FY22 — an improving ratio, but one that started from a position so weak that even a big year-on-year gain left the company burning far more cash than it brought in. The margin, such as it was, sat in advertising on high-traffic Hindi-medium content and in the small slice of free users who converted to paid live classes — not in the core product that drove downloads.

The numbers

Figures below are as filed with the Registrar of Companies and reported by Entrackr; amounts are in Rs crore unless noted. FY23 loss was not available in public reporting at the time of writing and is left blank rather than estimated.

Fiscal year Revenue (Rs crore) Loss (Rs crore) Total expenditure (Rs crore)
FY20 0.08 (Rs 8 lakh) 26.26 27.3
FY21 2.0 102.32 105.2
FY22 15.22 (10.83 from operations) 179.24 194.47
FY23 26.6 not disclosed not disclosed

Where the money comes from

The risks

The takeaway

Doubtnut’s arc is a reminder that reach and revenue are not the same asset, and that raising money against reach can buy a company several years before that distinction gets enforced. Tens of millions of monthly users, 85 percent of them outside India’s biggest cities, was a genuinely rare position to be in in 2019 and 2020 — rare enough that Byju’s offered nine figures for it. But the filings for every year from FY20 to FY23 show a company that kept adding users faster than it worked out how to charge a meaningful share of them, and investors eventually stopped underwriting that gap. The lesson is not “monetise early” as a slogan; it is that a founding team should be able to name, in one sentence, which specific slice of its free users is expected to pay, and for what, well before the funding that lets it postpone that question runs out.

Frequently asked questions

Who founded Doubtnut and when?

Doubtnut was founded by the husband-wife duo Tanushree Nagori and Aditya Shankar, both IIT Delhi alumni. The company was incorporated in 2016 as Class 21A Technologies, building on a tutoring venture the couple had run since 2009, and the Doubtnut app launched in October 2017.

Who owns Doubtnut now?

Allen Career Institute, the Kota-based test-prep group, acquired Doubtnut in December 2023 for a reported $10 million. The founders have continued in operational roles as co-founders, with the company running as an Allen subsidiary (Business Standard and TechCrunch, December 2023).

How much funding did Doubtnut raise before being acquired?

Doubtnut raised more than $50 million across roughly eight rounds, including a $15 million Series A led by Tencent in January 2020 and a $31 million Series B co-led by SIG and Lupa Systems in February 2021, before a final $2.5 million convertible-note round from existing investors in April 2023 (Entrackr; TechCrunch, December 2023).

Why did Doubtnut sell for so much less than earlier offers?

In 2020, Byju’s held advanced talks to buy Doubtnut for a reported $125-150 million, but the deal collapsed over valuation disagreements. By December 2023, after years of losses far exceeding revenue and a cooling edtech funding market, Doubtnut sold to Allen Career Institute for about $10 million (TechCrunch, December 2023).

What was Doubtnut’s revenue and loss in its last reported years?

Per RoC filings reported by Entrackr, Doubtnut’s revenue was Rs 15.22 crore in FY22 (loss of Rs 179.24 crore) and Rs 26.6 crore in FY23, a roughly 44 percent rise; FY23 loss figures were not available in public reporting at the time of writing.

Sources

Figures are as of September 2026. Currency converted at $1 ≈ ₹96.0 as of 18 September 2026 (Trading Economics).

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