We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

Should I dump Duolingo from my ISA and buy Palantir stock instead?

These two AI-powered software stocks have been heading in very different directions, making me wonder if I should sell one to buy the other in my ISA.

| More on:
Thoughtful man using his phone while riding on a train and looking through the window

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Duolingo (NASDAQ:DUOL) is meant to be a growth stock in my ISA. Instead, it has been shedding value faster than a snake on GLP-1 medication.

Since I bought this stock early last year, it has crashed 65%! The digital education firm’s first-quarter report earlier this week showed slowing growth.

XXX

In contrast, Palantir (NASDAQ:PLTR) continues to report eye-popping growth. The question I’m asking myself now is: should I dump Duolingo and switch to Palantir?

A mixed quarter

Duolingo offers over 40 different languages, as well as courses in maths, music, and chess. It has a free ad-supported offering and two paid subscription tiers for more serious students.

Heading into Q1, management warned that bookings growth would be slower because it was working to improve the free user experience to capture a wider pool of learners. It’s aiming for 100m daily active users (DAUs) in 2028.

Looking at the results, I see no immediate red flags. Revenue increased 27% to $292m, beating estimates, while DAUs grew 21% to 56.5m. Paid subscribers jumped 21% to 12.5m, and the free cash flow margin improved to 50.6% ($147.8m), which is exceptional.

Looking ahead, however, management warned that Q2 bookings would slow to approximately 6%, before accelerating to approximately 10.5% for the full year. Bookings serve as the leading indicator for what revenue will roughly look like in the coming quarters.

A blowout quarter

Meanwhile, Palantir is showing no weakness. In fact, the AI software company reported another blockbuster quarter earlier this week.

Revenue skyrocketed by an astonishing 85% to $1.6bn, with full-year guidance raised to 71% growth. US commercial revenue grew by a staggering 133%, as firms continue to flock to its Artificial Intelligence Platform (AIP).

CEO Alex Karp was quick to downplay these achievements, as he said: “We are an N of 1. Our financial results now demonstrate a level of strength that dwarfs the performance of essentially every software company in history at this scale.”

It’s worth noting that Palantir isn’t just disseminating AI software to others. It’s also using the technology to reduce headcount even as the firm’s growth scales explosively.

My move

Honestly, it’s tricky to assess whether Duolingo is successfully laying the foundations to become a much larger company or its growth is over. Clearly, the market thinks the latter, given that Duolingo’s enterprise value to free cash flow is now just 11.

Personally, I think that’s far too cheap given that we see no evidence of AI disruption in its business, despite the technology already being around for years.

In Q1 alone, we published 20,500 course units…that is more than 10 times what we were shipping per quarter just two years ago. AI has fundamentally changed what is possible for us, and I believe we are just scratching the surface.
CEO Luis von Ahn

In contrast, Palantir is trading at more than 100 times trailing free cash flow. So, it’s chalk and cheese with the valuations.

As I see it, the Duolingo story is in temporary limbo (and investors hate uncertainty), whereas the Palantir growth story looks fully priced in. My assessment then is that Palantir stock is currently overvalued but Duolingo looks undervalued.

On this basis, Duolingo might be worth a look. But I’m leaving them both alone to focus on other stocks.

Ben McPoland has positions in Duolingo. The Motley Fool UK has recommended Duolingo. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »