These are the two big science museums in San Francisco, and families ask about them in the same breath. They are not interchangeable. One is a workshop, the other is a habitat.
What is the difference between them?
The Exploratorium is six acres of exhibits you are meant to touch: light, sound, water, motion, illusions, and a tinkering studio where children build things. It sits on a pier over the bay, so there is a lot of daylight and room to run.
The California Academy of Sciences is a natural history museum with an aquarium in the basement, a four-storey rainforest in a dome, a planetarium and a colony of African penguins, all under a living roof in Golden Gate Park.
How do they compare on price, time and age?
| Exploratorium | California Academy of Sciences | |
|---|---|---|
| Where | Pier 15, Embarcadero | 55 Music Concourse Dr, Golden Gate Park |
| Adult ticket | About $40 | About $49, more at peak times |
| Child ticket | About $30, ages 4–17; under 4 free | About $39, ages 3–12; under 3 free |
| Best age range | Roughly 5 to 15, with a younger area | Roughly 2 to 12 |
| Time needed | 3 hours | 3 to 4 hours |
| Closed | Mondays, mostly | Open daily; Thursday evenings are 21+ |
| Getting there | F-line streetcar, or walk from the Ferry Building | The 44 stops at the door; N-Judah and 5 nearby |
| Discounts | $3 Museums for All; library passes | $5 Museums for All; $3 off with transit proof |
| Food | Two cafés, plus the Ferry Building nearby | Café inside; the Inner Sunset is a short walk |
Which should you choose?
Choose the Exploratorium if your children are five or older, they like building and experimenting, you are staying near the Embarcadero, or you want a slightly cheaper ticket with more elbow room.
Choose the Academy of Sciences if your children are under six, they want animals, it is raining, or you are already spending the day in Golden Gate Park and want everything in one place.
Choose neither if the weather is good and the budget is tight. The Randall Museum is free and has live animals, the Cable Car Museum is free, and the Presidio’s Outpost playground beats both museums for a sunny afternoon with a four-year-old.
How do you get in for less?
Both take part in Museums for All, which gets EBT and Medi-Cal cardholders in for three to five dollars, up to four people. Library cardholders can reserve free passes to the Academy through Discover and Go. The Academy takes three dollars off if you arrive on foot, by bike or with same-day transit proof, and teachers at California public schools get into the Exploratorium free.
Prices and hours were checked in September 2026 and can change, so confirm before you go.
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Which is better for toddlers, the Exploratorium or Cal Academy?
The Academy of Sciences, narrowly. Penguins, a coral reef tank and a rainforest dome hold a three-year-old’s attention with no explanation required. The Exploratorium has a dedicated younger-children area and plenty that works, but much of it rewards a child who can read a prompt and try something.
Can you do both in one day?
You can, but you should not. Each deserves three hours or more, and they sit at opposite ends of the city, about 25 minutes apart by car and longer by Muni. Pick one, and if you have a second day, do the other.
Which is better value?
The Exploratorium is about nine dollars cheaper per adult and is open later on Thursdays for adults. The Academy packs an aquarium, a planetarium show and a rainforest into one ticket, which is more per hour if you stay the whole day. Both take Museums for All cards at $3 to $5.
Which is quieter?
Both are crowded at weekend middays in school holidays. The Exploratorium has more floor space per visitor and a pier to escape onto. At the Academy, go at opening or after 3pm and do the penguins first.
Which is better for a rainy day?
The Academy. It is entirely indoors and genuinely holds a full day, and the planetarium gives you a sit-down break. The Exploratorium is also indoors, but part of its charm is the outdoor gallery and the bay walk outside.