Scan and solve
A solution you can follow, not just an answer
Every solve shows the knowns, the equation chosen and why, the algebra, and the boxed result with units. The point is the method; the answer is the by-product.
Physics AI tutor for iPhone
Physics, explained step by step, until it clicks.
Photograph a problem and Electra shows the knowns, the equation and why, the algebra, and the answer with units. Ask about any step, then drill it with quizzes and flashcards until you can do it without her.
Free to download. Mechanics to modern physics, high school through intro college.
Worked example
A car traveling at 12 m/s brakes with a constant acceleration of 3.0 m/s² opposite its motion. How far does it travel before stopping, and how long does that take?
- 1 List the knowns with the direction of travel as positive: v₀ = 12 m/s, v = 0 m/s, a = -3.0 m/s². Distance and time are both unknown, so start with the equation that leaves time out.
- 2 Use v² = v₀² + 2a(x - x₀): 0 = (12 m/s)² + 2(-3.0 m/s²)(x - x₀).
- 3 Solve for the displacement: x - x₀ = 144 / 6.0 = 24 m.
- 4 Now use v = v₀ + at for the time: 0 = 12 + (-3.0)t, so t = 12 / 3.0 = 4.0 s.
- = The car covers 24 m and takes 4.0 s to stop.
Formula guides
Twenty formulas, each with its conditions and a worked example
What the formula says, what every symbol means, when you are allowed to use it, a problem worked all the way through, and the mistakes that cost the marks.
Mechanics
- Kinematics equations
v = v₀ + at - Torque formula
τ = rF·sin θ - Impulse formula
J = F_avg·Δt - Work-energy theorem
W_net = ΔKE = ½mv² - ½mv₀² - Moment of inertia formula
I = Σ mᵢrᵢ² - Tension formula
T = mg - Momentum formula
p = mv - Centripetal force formula
F_c = mv² / r - Newton's second law
ΣF = ma - Projectile motion formulas
v₀ₓ = v₀·cos θ₀ and v₀ᵧ = v₀·sin θ₀
Electricity and magnetism
Waves and optics
Thermodynamics and fluids
Modern physics
How it works
From a photo of the problem to a method you own
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Photograph the problem
Point the camera at the textbook or the worksheet and crop to one problem. Electra reads it and starts a solution with the reasoning shown line by line.
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Drill it until it sticks
Quizzes by topic with instant feedback, and spaced-repetition flashcards for the definitions and relations you keep forgetting. The method becomes recall.
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Keep the formula sheet that explains itself
Every formula sits with its variables and the conditions it needs. Expand one for a worked use, then ask the chat about the step that lost you.
What is in the app
A tutor, a drill partner and a formula sheet
Everything a physics course asks of you, in one place, with the reasoning always visible.
Ask Electra
A tutor that answers the question you actually have
Concepts, a stuck step, a textbook problem typed out, a photo of your working. Chat history keeps every thread so you can pick a problem back up.
Quizzes
Topic quizzes with instant feedback
Mechanics, electricity and magnetism, waves and optics, modern physics. Each question explains the right answer, not just marks the wrong one.
Flashcards
Spaced repetition for the things you keep forgetting
Cards come back on a schedule tuned to what you missed, so the definitions and formulas you need under time pressure are the ones you have seen most.
Your level
High school through intro college
Difficulty adapts to where you are. AP and A-level students and first-year undergraduates see problems pitched at their course, not a generic pool.
Formula sheet
Every formula with its conditions attached
A formula is only useful if you know when it applies. Electra's sheet pairs each one with its variables, its conditions and a sample use.
Questions
Before you start
Is Electra a way to skip the homework?
No, and it is built not to be. Every solution shows its reasoning step by step so you can see how the method works and reproduce it yourself. If you only want a number, a calculator is faster.
Which physics topics does it cover?
Mechanics (kinematics, forces, energy, momentum, rotation), electricity and magnetism (fields, circuits, induction), waves and optics, and modern physics (relativity basics, quantum ideas). High-school and introductory college level.
Can it read handwritten problems?
Yes, from a clear photo. Crop to a single problem, keep the page flat and well lit, and Electra reads the text and any given values.
What if a step is wrong?
Solutions are AI-generated and can contain a mistake, which is exactly why every step is visible. Ask in chat about the step you doubt; Electra re-derives it. The formula pages on this site are verified against open textbooks and show every worked example recomputed.
Is Electra free?
Free to download, with the quizzes, flashcards and formula sheet included. Photo solving and the chat tutor need a subscription, which the app offers inside.
The next problem is the one you finally get.
Free to download on iPhone. Quizzes and flashcards are included; photo solving and chat are the subscription.
Free to download