How do different login options affect my apps price?

The login screen is one of the first things users encounter, and it is also one of the most consequential decisions you will make about your app's build cost, your sign-up rate, and your relationship with user data. Clients often treat it as a minor detail, something to tick off the list before getting to the interesting design work. In practice, the authentication layer touches everything: how much the app costs to build, how many users complete onboarding, and what data you actually own about the people using your product.

Letting users experience the product before asking for commitment consistently produces higher sign-up rates.

We generally defer login as late as possible. On a gifting platform and a sports second-hand marketplace we worked on, we allowed users to explore the product before asking for anything. The result was consistently higher sign-up rates, because users had already seen the value before we asked for their commitment. The question of when to ask is as important as how to ask, and both have real cost implications.

But the when and the how are not independent decisions. The type of authentication you choose shapes the cost to build, the data you collect, the ongoing maintenance burden, and how users feel at that first point of friction. Get it right and registration feels like a natural next step. Get it wrong and it feels like a toll booth placed before users have any reason to pay.

The four main login options and what each one costs to build

Every app authentication method sits somewhere on a spectrum between cheap-to-build and expensive-to-maintain, and between low-friction and high-friction for the user. Understanding the trade-offs before you commit to one saves rework later.

The simplest path is email and password, but it carries the highest ongoing support cost because users forget passwords and need reset flows. Social login looks cheap because the SDK handles the complexity, but that cost shifts elsewhere, which we will come to. Building a custom authentication API with user roles is the most expensive starting point. According to Planeks' API cost calculator, a custom SaaS API covering authentication, role-based access, and integration tests runs between $12,000 and $22,000 depending on the number of roles required. That is a significant line in any build budget, and it is worth knowing what you are buying.

How login timing affects sign-up rates

Placing a registration gate at the start of an app assumes users already know they want what you are offering. Most do not. They arrived with a vague interest and need the product itself to convert that into conviction. Asking for an account before they have felt any value is asking them to commit to something they have not yet experienced.

On the gifting platform and the sports second-hand marketplace we worked on, deferring login was not a preference, it was a deliberate decision grounded in a simple principle: let people see the value first, then ask for commitment. Users who reached the login prompt having already used the product had a reason to continue. Users who hit it on the first screen had none.

The timing question has a practical answer. We identify the core user flow, the emotional response the product should produce, and the functional job it is doing. From that, we work out how much usage a person needs before they genuinely understand the product's value. That threshold is exactly where the login prompt belongs. For a fitness product, a user might need to complete a five-minute workout before they feel it. For a marketplace, it might be browsing three or four listings. The simulation or the live product experience should deliver that minimum, and not a screen less.

Map the moment a user first thinks "I want to come back to this" and place your login prompt there. Everything before that point is a barrier with no return.

Tiered authentication: matching verification level to user action

Not every action in an app carries the same risk or requires the same level of trust. Asking a user to create a full verified account before they can browse a product catalogue is disproportionate. Letting someone win real money without age verification is the opposite problem. The solution is tiered authentication: you match the verification level to what the action actually requires.

On the auction game product we worked on, we built several authentication levels and triggered each one only when the product needed it. Watching or favouriting an auction required a basic account, just a name and an email address or phone number. Playing a game and winning real money required elevated verification, including age confirmation and a payment method on file. We never asked for additional data upfront as a blanket requirement.

Ask for exactly what the action requires, at exactly the moment it requires it.

This approach keeps early friction minimal while satisfying legal and functional requirements at the right point. It also feels fairer to users. There is a significant psychological difference between a product that asks for your date of birth before you have touched a single feature, and one that explains it needs to verify your age because you are about to do something that requires it. Context makes the request feel proportionate rather than intrusive.

Draw a map of every action in your app and label each one with the data it genuinely requires. Build your authentication tiers from that map, not from what feels thorough.

When you have no choice but to gate the app upfront

There are situations where deferring login is not an option. The anonymous messaging app we worked on required authentication right at the start, before a user could send a single message. The product presented as anonymous to other users, but on the back end every message had to be traceable to a real account. The reason was legal: if abuse or harassment occurred, the platform needed to be able to identify and act on it. That requirement could not be designed around.

This is the kind of decision that sits outside product preference. No amount of UX reasoning changes a legal requirement. The question is not whether to gate upfront but how to make that gate feel worth crossing. When a product cannot allow users in without registration, there are two approaches that can still communicate value before commitment.

• Static onboarding screens that show users what to expect once they are inside the product.
• A simulated product environment where users can experience the core function in a guided way, without touching the live product.

The simulated environment is the more convincing of the two. Static screens tell users what a product does. A simulation lets them feel it. The goal in both cases is the same: demonstrate value before asking for commitment, even when the architecture means that demonstration has to happen outside the authenticated product.

Compensating for upfront registration with out-of-app content

When users cannot experience a product before registering, the work that would normally be done by the product itself has to happen elsewhere. On the anonymous messaging app, we could not drip-feed value through use, so we had to front-load all of that communication into the App Store presence instead. Screenshots, the listing copy, the preview imagery: all of it had to do the job that onboarding would normally handle.

This is not a small investment. A well-crafted App Store listing with purposeful screenshots takes real time to do properly, and it needs to be updated whenever the product changes significantly. The cost of upfront registration does not disappear, it shifts from in-app onboarding to out-of-app marketing.

The framework we used was straightforward: identify everything the product would normally communicate through use, and find a way to communicate it before the user opens the app. If a user arrives at the registration screen already understanding what they are signing up for, the gate feels like a natural step rather than an obstacle.

If your app must gate upfront, audit your App Store screenshots as though they are your onboarding flow. Each one should answer a question the user would otherwise only answer by using the product.

Social login's hidden costs and data trade-offs

Social login, signing in with Google, Apple, or Facebook, is often the first option clients suggest because it seems to solve everything at once. Users do not need to create a password. The SDK handles the authentication logic. Drop-off at the sign-up step should fall. All of that is true, but it is only true for the authentication step.

Social login gets users through the door, but it does not fill in anything else your product needs to know. If your product requires a date of birth, a location, a biography, or category preferences to function, users still have to provide all of that after social login. The convenience of the tap-to-login moment evaporates when users find themselves in a multi-step data collection flow immediately after. Social login works cleanly when a product genuinely needs minimal user data, a news feed storing topic preferences, for example. It adds friction when the product has a richer data requirement.

There is also the data ownership question. When a user authenticates through a social platform, that platform controls the scope of what you receive. The relationship between your product and your user is mediated by a third party, and if that platform changes its API terms, your integration is affected. IBM's pandemic security survey found that 82% of users reuse the same password across multiple accounts, which makes social login genuinely useful as a security improvement, but that benefit comes with the trade-off of shared data rather than internally held credentials.

Passwordless login as a middle path

There is an authentication method that sits between social login and traditional email-and-password that clients often overlook: passwordless login via a one-time code sent to a phone number or email address. The user enters their number, receives a code, and they are in. No password to remember, no reset flow to build and maintain, no credential interception risk.

We advise clients to consider this approach because it offers the simplicity of social login without sharing user data with a third-party platform. The authentication stays internal. The user experience is similarly low-friction. And the product team retains full ownership of the relationship.

The build complexity sits in the middle of the options available, more involved than plugging in a social SDK, less expensive than a full custom API with roles. SMS delivery costs are a real line item at scale, so for high-volume products it is worth modelling that cost before committing. Email OTP avoids that cost but is marginally slower for users.

For products where data ownership matters and the user base is less likely to have a social account you can rely on, wellness products, for instance, where older demographics are common, passwordless login is often the most practical answer. It removes the friction of password management and keeps the authentication entirely within the product's own ecosystem.

How authentication choices affect ongoing maintenance costs

The build cost of an authentication system is a one-time figure. The maintenance cost runs for the life of the product, and it varies significantly depending on what you chose at the start.

Email and password systems generate a disproportionate share of customer support tickets. Forgotten passwords, locked accounts, and security alerts all require either automated infrastructure or human handling. Social login trades that burden for a dependency on a third party's API, when Apple or Google changes authentication scopes or deprecates a feature, your integration needs work, on their timeline not yours.

The tiered model we built for the auction game product adds a different kind of maintenance overhead: each tier has its own logic, and any change to the product's feature set requires checking whether the verification requirements still match the actions. That overhead is worth it when the product genuinely needs different levels of trust, but it is a real consideration for lean teams.

Conclusion

Authentication is a product decision, not a technical one. The method you choose, the moment you introduce it, and how much you ask for at each stage all shape the user's first impression, your build costs, and your ongoing data relationship. There is no single right answer, but there are wrong ones: gating too early, asking for too much, and treating social login as a shortcut when your product has a rich data requirement are the most common.

Across the products we have worked on, the auction game with its tiered registration model, the anonymous messaging app with its legal requirement for upfront authentication, the gifting platform and sports marketplace where deferred login consistently produced better sign-up rates, the pattern is the same. Match the verification level to the action. Ask for data at the moment you need it, not before. And if you cannot defer login, invest in the out-of-app experience that has to do the same job instead.

The login screen will always feel like a small design decision. In practice it is one of the highest-leverage decisions in the whole build. Getting it right costs almost nothing extra at the planning stage. Getting it wrong costs users, and then it costs money to fix.

If you are working through these decisions and want a second perspective on your authentication strategy, let's talk through your app's approach.

Frequently Asked Questions