Stuck on a question?

Snap it. CalcHack finds the fastest way to solve it in Desmos — or tells you when doing it by hand is quicker.

That didn't work

Free plan

5 of 5 free scans left today Go Pro →

1

Snap the question with your camera

2

Get the fastest Desmos strategy

3

Watch it solved on a live graph

Built for the digital SAT

Answers come back as the exact keystrokes for the Desmos calculator built into Bluebook — plus a live graph so you can see it work.

Linear systemsQuadraticsCircles & conicsExponentialsTrigStatisticsWord problems

Desmos cheat sheet →
See a worked example →

Walkthrough

100% Pinch to zoom, or press + − 0

Answer look wrong? Tell me about it — it's how this gets better.

History

Every question you scan is saved here. Mark the ones you missed, then retry them with the answer hidden. Pin the tricky ones to revisit in your next study session.

Saved scans

No scans yet. Your solved questions will appear here.

You've used today's 5 free scans

5 of 5 free scans used.

Free scans come back

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CalcHack's free-scan day resets at midnight UTC, shown here in your local time.

CalcHack is for studying and practice questions only — never for use during a real test.

👑

CalcHack Pro

Free gives you 5 scans a day. Pro removes that daily cap, so a long practice session doesn't stop at question five.

What Pro adds

✓No daily scan capFree plan: 5 scans a day, reset at midnight UTC. Pro: scan as many practice questions as you need. A speed limit of about 40 scans a minute still applies, to stop abuse.

✓Not held back by shared Wi-FiFree scans on a busy shared network, like school Wi-Fi, can hit a network-wide daily limit. Pro scans don't count toward it.

Already free for everyone

•Live interactive Desmos graphsTap through each step on a real calculator

•"Fastest method" verdictsDesmos, by hand, or a mix of both

•Scan historyYour last 50 scans plus any you pin, synced between devices when you sign in

Monthly

$6.99

per month

BEST FOR SAT PREP

3 months

$14.99

$5.00/mo · a full prep cycle

Annual

$39.99

$3.33/mo · a full school year

$14.99 billed today, then $14.99 every 3 months until you cancel. Cancel any time in Settings → Manage or cancel; it takes two clicks and you keep Pro until the period you paid for ends. Full refund within 14 days, no questions asked.

For studying and practice questions only — never for use during a real test.

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Score improvement not guaranteed · Terms · Privacy

Settings

Appearance

Theme

Hide the answer at firstTurn this on to try it first: the answer, steps, graph, trap and share image stay hidden until you tap Reveal. Walkthroughs show everything right away unless you turn this on.

AI Engine

Model

Google AI key (free)

100% free, no credit card. Get one in ~60 seconds: go to aistudio.google.com → sign in with any Google account → Get API key. Free tier allows hundreds of scans per day. Stored only on this device.

Anthropic API key (only for Claude models)

Optional. Get a key at console.anthropic.com. Each scan costs roughly 1–2¢.

Graphing

Desmos API key (optional)

CalcHack uses its own Desmos API key. You can override it here with your own if you prefer.

Data

Scan history0 saved scans on this device

Signed in, your scans sync to your account and follow you between devices. As a guest they stay on this device only.