Guide: Get an API key for screenshot scanning in 10 minutes

How it works

To do the reading, the app uses an AI model from Anthropic (Claude) or OpenAI (the company behind ChatGPT), through your own account with one of them. Setting that up means two things:

1. Putting a little money on your account. $5 is plenty to start.
2. Creating an API key, a long password that lets Fuji Cookbook use your account.

It takes about 10 minutes and you don’t need any technical knowledge.

What it costs

As of November 2026, each screenshot costs about 1 cent when you scan with Anthropic’s Haiku model, which is what the app picks for you. That means $5 covers roughly 500 screenshots.

• It’s not $5 a month. You pay once, up front, and each scan takes a cent or so off your balance. Nothing renews, and nothing is charged if you don’t scan.
• Credit expires 12 months after you buy it, on both Anthropic and OpenAI, whether you’ve used it or not. That’s why we suggest starting with $5 rather than a larger amount. You can always add more later.
• Fuji Cookbook doesn’t charge for any of this and never sees your key, your screenshots or your payment. You pay Anthropic or OpenAI directly.

Choose Anthropic or OpenAI

You only need one. Both work the same way in the app.

Not sure? Choose Anthropic. It’s the app’s default, and the costs above are for its Haiku model.

• Using Anthropic: follow Part A, then Add your key to Fuji Cookbook.
• Using OpenAI: follow Part B, then Add your key to Fuji Cookbook.

You’ll need:

• A credit or debit card
• About $5, plus any sales tax where you live
• Fuji Cookbook on your iPhone or iPad

Part A: Anthropic

A1. Create your Claude Console account

The Claude Console is Anthropic’s website for API keys and billing.

1. Go to platform.claude.com.
2. Create a Claude account, or sign in if you already have one.
3. Follow the prompts to finish setting up. You may be asked to confirm your email or answer a couple of short questions.

When you’re done, you’ll land on the Console’s main page.

A2. Add $5 of credit

Your key won’t work until there’s money in the account.

1. Go to the Billing page. It’s under Settings in the left-hand menu, or go straight to platform.claude.com/settings/billing.
2. Click Buy credits (on a brand-new account it may say Purchase credits).
3. Choose $5.
4. Open Billing address and enter your address.
5. Enter your card details when the card field appears.
6. Leave Business tax ID blank unless you’re buying for a registered business.
7. Check the total. Tax may be added on top of the $5.
8. Click the purchase button to confirm.

When you see “You’re all set!”, you’re done. Your $5 shows on the Billing page right away.

Auto-reload is off unless you turn it on, so you won’t be charged again. Leave it that way.

A3. Create your API key

1. Go to the API keys page. It’s under Settings in the left-hand menu, or go straight to platform.claude.com/settings/keys.
2. Click Create key.
3. Fill in the form:
   • Name: something like “Fuji Cookbook”.
   • Expiration: pick the longest option you’re offered. When a key expires, scanning stops until you create a new one.
   • Linked account: choose yourself.
   • Workspace: leave it set to Default.
4. Click the button to create the key.

A window shows your new key: a long string that starts with sk-ant-. Copy it right away, then continue to Add your key to Fuji Cookbook.

Part B: OpenAI

B1. Create your OpenAI Platform account

The OpenAI Platform is OpenAI’s website for API keys and billing.

1. Go to platform.openai.com.
2. Create an OpenAI account, or sign in if you already have one.
3. Follow the prompts. You’ll be asked for your name and birthday, a name for your “organization” (your own name is fine), and what best describes you.
4. If you’re asked to invite your team, click I’ll invite my team later.

B2. Add $5 of credit

Your key won’t work until there’s money in the account.

1. Go to the Billing page. Click the settings (gear) icon, then Billing, or go straight to platform.openai.com/settings/organization/billing.
2. Click Add payment details and enter your card details.
3. Change the amount to $5. It starts at $10, so check this before you continue.
4. Turn off auto-reload. It’s on by default, and it charges your card again automatically whenever your balance gets low.
5. Check the total. Tax may be added on top of the $5.
6. Confirm your purchase.

Your $5 may take a few minutes to show up on the Billing page.

B3. Create your API key

1. Go to the API keys page. It’s in the left-hand menu, or go straight to platform.openai.com/api-keys.
2. Click Create new secret key.
3. Fill in the form:
   • Owned by: choose You.
   • Name: something like “Fuji Cookbook”.
   • Project: leave it set to Default project.
   • Permissions: leave it set to All.
4. Click Create secret key.

A window shows your new key: a long string that starts with sk-. Copy it right away, as described next.

Copy your key right away

This is the only time you’ll ever see this key. Once you close the window, it’s gone. Before you do anything else:

1. Click the copy button next to the key.
2. Paste it into Fuji Cookbook (see the next section), a password manager, or both. If you’re on a computer, a password manager that syncs to your iPhone is the easiest way to get the key onto your phone.
3. Only then close the window.

Closed it without saving? You can’t get that key back, but you can create a new one for free in about a minute.

Add your key to Fuji Cookbook

1. Open Fuji Cookbook and tap the gear icon at the top of the screen to open Settings.
2. Turn on Enable AI Features. The app explains what gets sent where; tap Turn On.
3. Under Provider, choose Anthropic or OpenAI, whichever you set up.
4. Paste your key into the Anthropic API Key or OpenAI API Key box.

The app checks the key with your provider and shows how many models are available with it. Under Recipe Scanning, it picks a fast, low-cost Model for you (Haiku on Anthropic). Leave it as it is.

That’s it. Your key is stored in your device’s Keychain and is only ever sent to Anthropic or OpenAI.

Scan your first recipe

Take a screenshot of a recipe, then either:

• Share it from the Photos app: open the screenshot, tap the Share button, and choose Fuji Cookbook.
• Or, in Fuji Cookbook: on the Recipes tab, tap +, then Scan Screenshot (AI), and pick the screenshot.

The app sends the screenshot to your provider, reads the settings, and shows you a new recipe. Check it against the screenshot before you save it or send it to your camera. AI reads most recipes correctly, but it can get a value wrong.

Keep your key safe

Treat your API key like a password to your bank card. Anyone who has it can spend your credit.

• Don’t share it, email it, or post it anywhere.
• If you need to keep a copy, keep it in a password manager.
• If you think someone else has seen it, go back to the API keys page on your provider’s site, delete that key, create a new one, and paste the new one into Fuji Cookbook.

Good to know

• Check your balance any time on your provider’s Billing page.
• Credit expires 12 months after purchase and can’t be extended. Any credit you haven’t used by then is lost.
• Purchases generally can’t be refunded, another reason to start small.
• Topping up: on the Billing page, click Buy credits (Anthropic) or Add to credit balance (OpenAI) and choose an amount.
• Auto-reload charges your card automatically when your balance gets low. If you want to keep your spending to what you put in, leave it off. On Anthropic you turn it on with Set up auto-reload and off with Manage auto-reload ▸ Turn off; on OpenAI it’s a switch on the Billing page, where you can also set a monthly limit.
• Turning AI off: switch off Enable AI Features in Settings. Your key stays saved for next time.
• Removing your key from the app: in Settings, tap Delete API Keys. This removes the key from your device only. To stop the key working anywhere, delete it on your provider’s API keys page too.

If something goes wrong

The app says my API key was rejected

Check that:

• You copied the whole key, starting with sk-ant- (Anthropic) or sk- (OpenAI), with no spaces before or after.
• You chose the matching Provider in Settings. An OpenAI key won’t work with Anthropic selected, and the other way round.
• The key hasn’t expired or been deleted on your provider’s API keys page.

The app says my provider returned an error

The most common cause is an empty balance. Check your provider’s Billing page. If you’ve just bought credit on OpenAI, wait a few minutes and try again.

I need help with my Anthropic or OpenAI account

Fuji Cookbook can’t see or change your account. Anthropic’s help center is at support.claude.com, and OpenAI’s is at help.openai.com.

Something else isn’t working

Email us at [email protected]. Tell us which provider you chose and what the app says. Never send us your API key.