By Alex, founder of Highstreett
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Books like Project Hail Mary, sorted by warmth rather than premise
If you loved Project Hail Mary, you have probably already met the titles most lists return. The three best picks you likely haven’t: To Be Taught, If Fortunate (the warmth and wonder), The Mountain in the Sea (the alien-mind puzzle) and Delta-v (the engineering). Full picks below, sorted by which part you loved.
Find more science fiction like this
Project Hail Mary has a head and a heart, and almost no other book has both. The head is competence porn: one person reasoning through real science, problem by problem. The heart is Rocky: a genuinely warm friendship with a completely alien creature, and the book’s stubborn optimism about cooperation. Comps for the head are everywhere. The warmth is what’s rare, because most first-contact fiction is ominous rather than a buddy story. So this list splits the book into the things people actually loved and matches each separately, with at least one well-known comp and at least one under-listed pick per section, checked against the standard lists so you’re not being handed the usual suspects relabelled. Tone is flagged on every entry, because a warmth reader who lands on a bleak book will not have a good time. No spoilers for anything, including Project Hail Mary itself.
What Highstreett returned for “books like Project Hail Mary”
- The Martian, Andy Weir
- Seveneves, Neal Stephenson
- We Are Legion (We Are Bob), Dennis E. Taylor (2016)
- The Mote in God's Eye, Larry Niven and Jerry Pournelle
- The Murderbot Diaries: All Systems Red, Martha Wells
- Delta-v, Daniel Suarez
See this result · run 3 September 2026
Editor’s verdict: Three are already on this page, including Weir's own The Martian, which is the one book a reader of Project Hail Mary has almost certainly read. It sorted nothing by warmth, which is the axis this page uses.
How this list was made: it starts from the Highstreett book search results above, run 3 September 2026 and shown as they came back. Alex, founder of Highstreett, chose the final list.
If you loved the science problem-solving
1. The Martian, Andy Weir (2014)
well-known comp · hard SF · warm, funny tone
The blueprint: a stranded, wisecracking problem-solver sciences his way out of cascading disasters, the exact voice and rhythm that make Ryland Grace easy to root for. Differs: solo on Mars, no alien, lower cosmic stakes, and if you've read it already it's the one comp that adds nothing new.
2. Delta-v, Daniel Suarez (2019)
under-listed pick · hard SF · cool thriller tone
The most rigorous real-engineering problem-solving on this list: asteroid mining worked out to the actual orbital mechanics, with a survive-or-die-in-space clock. Differs: colder and more corporate-thriller, an ensemble rather than a lone hero, and the characters are thin. You're here for the hardware, not the heart.
3. Mission of Gravity, Hal Clement (1954)
under-listed classic · hard SF · cool but hopeful tone
A physics-driven quest across a wildly alien world, and a genuine human and alien collaboration: a human and an alien ship's captain solving a problem together and becoming friends. A Rocky-and-Grace ancestor written seventy years early. Differs: golden-age prose, flat characterisation, and the wonder lives in the world-building rather than the emotion. In print in the UK as a Gollancz SF Masterwork.
4. The Calculating Stars, Mary Robinette Kowal (2018)
well-known comp · alternate-history SF · warm, determined tone
A mathematician joins an urgent space programme after an extinction-level event makes leaving Earth a necessity. Differs: ensemble alternate history and social barriers rather than a lone astronaut, with the science serving a story about who gets to reach space.
5. Aurora, Kim Stanley Robinson (2015)
under-listed pick · hard SF · cool, humane tone
A generation ship carries humanity towards another star, treating the engineering, biology and psychological cost as one connected survival problem. Differs: slower, more systemic and less comic, with no Rocky-like friendship to soften the scale.
If you loved decoding an alien mind
6. Children of Time, Adrian Tchaikovsky (2015)
well-known comp · hard SF · cool tone
A rigorous, patient depiction of a truly alien intelligence evolving on its own terms, and the vertigo of trying to understand a mind that isn't human-shaped. Differs: epic and multi-generational rather than intimate. The aliens are subjects of study, not a friend you eat lunch with.
7. The Mountain in the Sea, Ray Nayler (2022)
under-listed pick · literary SF · cool, cerebral tone
First contact as a pure communication puzzle: a scientist trying to decode a hyper-intelligent octopus species with its own symbolic language, which is the exact problem Grace faces with Rocky, minus the spaceship. Differs: literary, philosophical, multi-POV and far more pessimistic about humanity. A meditation on minds, not a save-the-day thriller.
8. Semiosis, Sue Burke (2018)
under-listed pick · first-contact SF · patient, hopeful tone
Human settlers have to communicate and coexist with a sentient alien ecosystem rather than simply conquer it. Differs: multi-generational and botanical, with cooperation built slowly across decades instead of one intense friendship on one mission.
If you loved Rocky
The hardest axis to match, and the one that decides whether a book actually scratches the itch.
9. The Long Way to a Small, Angry Planet, Becky Chambers (2015)
well-known comp · space opera · very warm tone
The warmth: a found-family crew, genuinely likeable aliens, and a humane, hopeful register. This is the book people reach for when what they missed was the feeling of Grace and Rocky. Differs: cosy, episodic and low-stakes, with no central science problem or ticking clock. The heart with almost none of the head.
10. All Systems Red, Martha Wells (2017)
well-known comp · SF novella · warm under armour, funny
The reluctant-companion dynamic and dry humour: a prickly non-human narrator who'd rather not care about the humans and ends up caring anyway, which is a lot of what makes Rocky land. Differs: action thriller rather than science problem-solving. The appeal is voice, not physics.
11. To Be Taught, If Fortunate, Becky Chambers (2019)
under-listed pick · hard-ish SF novella · warm, wonder-forward
The closer Chambers match nobody lists: a small crew doing real exoplanet science with earnest awe, capturing Project Hail Mary's sense of discovery as joy better than her famous one does. Differs: a quiet novella with no single alien friend and a deliberately unresolved ending. Reflection instead of propulsion.
12. A Closed and Common Orbit, Becky Chambers (2016)
well-known comp · space opera · very warm tone
An artificial intelligence and a young woman build a life together through patience, trust and chosen family. Differs: intimate and character-led, with no hard-science mission, but it carries the same conviction that a friendship can change what survival means.
13. The Sparrow, Mary Doria Russell (1996)
under-listed classic · first-contact SF · genuinely bleak
A Jesuit mission reaches an alien world with hope, curiosity and a belief that contact can be an act of grace. Differs: much darker than Project Hail Mary, and its first-contact consequences are devastating. Choose it for the moral and emotional weight, not the Rocky feeling.
If you loved the save-the-world stakes and the mystery-box reveal
An honest note: cosmic stakes are table stakes for big SF, and the wake-up-with-amnesia structure is a thriller device, not a subgenre. There's no genuine hidden gem here, so these are the reliable well-known comps rather than a manufactured one.
14. The Three-Body Problem, Liu Cixin (2008, English translation 2014)
well-known comp · hard SF · genuinely bleak
An existential threat to all humanity, worked out with hard-science seriousness. Andy Weir has recommended it himself. Differs: cold and bleak, with none of the warmth. Go in knowing.
15. Seveneves, Neal Stephenson (2015)
well-known comp · hard SF · cool, epic
Humanity's survival as one giant engineering problem: deep competence at enormous scope. Differs: minimal heart, and a famously divisive final third.
16. Recursion, Blake Crouch (2019)
well-known comp · SF thriller · propulsive
For the mystery-box, reconstruct-what's-happening structure and page-turn momentum, if the reveal engine was your hook. Differs: near-future thriller, no space, no alien, and the science is a device rather than the point.
Which UK edition of Project Hail Mary should you get?
These editions contain the same story. The ISBN is the useful detail when you are comparing listings, because the UK paperback has been reissued and the ebook is a separate digital edition.
| UK edition | ISBN | Published | What is different |
|---|---|---|---|
| Ebook | 9781473582583 | 4 May 2021 | Digital text edition, 496 pages |
| Paperback | 9781529157468 | 6 October 2022 | Penguin B format paperback |
| Paperback, reissue | 9781804953693 | 4 December 2025 | Current Penguin paperback, 496 pages |
Edition data checked against Penguin’s UK catalogue on 10 September 2026.
The honest bit
Use tone as your filter, because more than pace or premise, the warmth is what people miss. Carrying it: To Be Taught, If Fortunate, The Long Way to a Small, Angry Planet, All Systems Red and The Martian. Cool but rewarding: The Mountain in the Sea, Children of Time, Mission of Gravity and Delta-v. Genuinely bleak, go in knowing: The Three-Body Problem and Seveneves. A reader who loved this book for Rocky and bounces into Three-Body expecting the same feeling will not have a good time, and that’s the single most useful thing this page can tell you.
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Tell it what you loved about Project Hail Mary
Questions
Is there a Project Hail Mary movie?
Yes. The Ryan Gosling adaptation released in cinemas on 20 March 2026, and has been streaming on Prime Video since 3 July 2026. If the film brought you here, the book (Andy Weir, 2021) goes deeper on the science, and the picks above are for when you've finished both.
What should I read after Project Hail Mary if I loved Rocky?
Go straight to the Rocky section above. The Long Way to a Small, Angry Planet carries the warmth, All Systems Red carries the reluctant-companion humour, and To Be Taught, If Fortunate carries the wonder. For the alien-mind puzzle without the warmth, The Mountain in the Sea is the closest structural match on any list.
Is The Martian or Project Hail Mary better?
They're the same engine with different fuel: The Martian is pure survival competence, Project Hail Mary adds first contact and a friendship. Most readers who loved one love the other, so if you've somehow read Project Hail Mary first, The Martian is the safest pick on this page.