The Love Hypothesis is streaming now on Prime Video in the United States, where the romantic comedy premiered worldwide on Tuesday, September 23, 2026. It is included with a Prime membership at no extra charge, so if you already pay for Prime you can start it immediately — no rental or separate purchase needed.
When and where to watch The Love Hypothesis
The Love Hypothesis is a Prime Video original film, available exclusively on Prime Video and Prime Video with Ads. Amazon dropped it globally on September 23, 2026, across more than 240 countries and territories, and Prime originals typically go live at 12 a.m. PT / 3 a.m. ET — which is why US subscribers found it ready to stream first thing that morning.
Because it is a movie rather than a series, the whole thing is there in one sitting. If you are not a Prime member, the film is covered by the standard Prime membership or a stand-alone Prime Video subscription; it is not offered as a one-off digital rental separate from those plans.
How much does it cost?
There is no added fee. The Love Hypothesis is part of the Prime Video catalog included with an Amazon Prime membership, and it is also available on the lower-priced Prime Video with Ads tier. In other words, if you can stream other Prime originals, you can stream this one at no extra cost.
What The Love Hypothesis is about
The Love Hypothesis adapts Ali Hazelwood’s New York Times best-selling novel, a fake-dating romance set in the high-pressure world of university science. Olive, an ambitious PhD student, impulsively kisses the last person she should — a demanding professor, Dr. Adam Carlsen — to sell a white lie to a friend. What starts as a one-time cover story turns into a fake relationship with ground rules, and the rules get harder to follow as real feelings creep in.
It is a classic setup executed for an audience that made the book a phenomenon: the “fake couple who catch real feelings” premise, transplanted into labs, grant deadlines, and academic ambition. Fans of the novel have a built-in reason to tune in, and newcomers get a self-contained rom-com with a clear emotional through-line.
Why the release is a big deal
Ali Hazelwood’s novel was a runaway hit, propelled by BookTok into best-seller lists and a devoted readership that has been waiting years for a screen version. Casting Lili Reinhart — familiar to a large streaming audience from her run on Riverdale — as Olive gives Prime Video a recognizable lead to anchor that anticipation, while Tom Bateman takes on Adam, the standoffish professor at the center of the book’s slow burn. The result is one of the higher-profile romance titles of the fall streaming season, and dropping it in more than 240 countries on day one signals that Prime Video is treating it as a global event rather than a quiet catalog add.
Can you download it to watch offline?
Yes. Like other Prime Video originals, The Love Hypothesis can be downloaded to the Prime Video app on a phone or tablet for offline viewing, which is handy for a flight or a commute. Downloads are included with your membership at no extra cost, the same as streaming it directly.
Who is in the cast
Lili Reinhart stars as Olive Smith, opposite Tom Bateman as Dr. Adam Carlsen. The supporting cast includes Rachel Marsh as Anh, Jaboukie Young-White as Malcolm, Nicholas Duvernay as Jeremy, and Arty Froushan as Tom.
The film is directed by Claire Scanlon, working from a screenplay by Sarah Rothschild. It is produced for Prime Video through Amazon MGM Studios, with Elizabeth Cantillon among the producers.
Watch the trailer
Prime Video’s official trailer lays out the fake-dating arrangement and the chemistry that complicates it:
Should you read the book first?
You do not need to. The film is built to stand on its own, and the fake-dating premise is easy to pick up cold. That said, readers who want the fuller version of Olive and Adam’s slow-burn dynamic — the internal monologue a movie can only hint at — may enjoy pairing the two. Either order works, and neither spoils the other in a way that ruins the payoff.
Frequently asked
Where can I watch The Love Hypothesis in the US?
Only on Prime Video. It is a Prime Video original and is not streaming anywhere else.
When did it come out?
It premiered worldwide, including in the US, on September 23, 2026.
Is it free with Prime?
Yes. It is included with an Amazon Prime membership and with a stand-alone Prime Video subscription, and it is also on Prime Video with Ads. There is no separate rental fee.
Is The Love Hypothesis a movie or a series?
It is a feature film, so it is one complete story rather than a multi-episode season.
Is it based on a book?
Yes, it adapts Ali Hazelwood’s best-selling novel of the same name.
Who stars in it?
Lili Reinhart plays Olive and Tom Bateman plays Adam, alongside Rachel Marsh, Jaboukie Young-White, Nicholas Duvernay, and Arty Froushan.
