The signup screen is your most expensive screen

Someone who downloads your app arrives with a hope. If the first thing they see is a registration form, you are asking for effort before they have received anything.

You usually lose that trade.

Why this screen matters most

The signup screen is the first and easiest place a user can leave without ever trying the product. Someone you lose on a later screen has at least seen what you do. Someone you lose here forms no opinion at all.

And they do not come back. The app can sit on their phone and never open again.

Value first, account second

The most effective change is usually not improving the form but deferring it.

Can the user browse without an account? See the products, run the calculation, try the result? Ask for registration only when it becomes unavoidable — when placing an order, when saving data.

At that point the user has seen the value and is willing to fill in the form.

This is not possible for every app. But "registration must come first" is an assumption that often goes unexamined.

Every field has a price

For each field in the form, one question: can the account be created without this?

• Is the full name needed now, or can it be filled in on the profile later?
• Why do you need both a phone number and an email address?
• Is the date of birth a requirement, or is it there "for reporting"?
• What does an individual customer put in the "company name" field?

Anything you could ask later, ask later. A signup form is not a data collection opportunity, it is a barrier to be cleared.

Password rules backfire

"At least 8 characters, one uppercase, one number, one symbol" looks like it improves security. In practice it pushes people towards reusing the same password or writing it down.

Better: require length, do not mandate complexity. And add an eye icon to reveal the password — typos are easy on a phone, and someone who cannot see what they typed will try three times and give up.

Error messages

The most neglected part of the flow. Bad examples:

• "An error occurred" — which error, what should I do?
• A warning at the top of the form with no indication of which field it means
• Clearing every field when submission fails
• Saying "this email is already registered" without offering to sign in

The last one is particularly irritating. The user may simply have forgotten they had an account; asking "would you like to sign in?" is one line of work.

Third-party sign-in

Google or Apple sign-in reduces the form to a single tap. Useful, with two caveats.

If your iOS app offers any other social sign-in, Apple expects Sign in with Apple to be offered as well. Skipping it can get you rejected in review.

And do not make it the only option. Some people do not have those accounts, or do not want to use them; keep the plain email route open.

In short

Think of the signup screen not as a form but as a negotiation. The more you ask for, the more value you need to have demonstrated in return. In most apps that balance is tilted against the user — and the bill arrives not as fewer downloads, but as users who never actually use the thing.