What a Signup Really Costs Indian App Startups

What is cost per signup?

Cost per signup is paid media spend divided by the number of signups attributed to that spend. It is a form of cost per acquisition (CPA) where the acquisition event is account creation.

Some apps use a different activation event, such as KYC completion, first lesson or first order. The logic is the same:

• Numerator: spend on the campaigns you are measuring.
• Denominator: activation events from users who installed through those campaigns.
• The event should be meaningful: a step that real users complete and casual installers do not.

How much does a signup cost for an Indian app?

The median Indian app startup pays about ₹48 per signup from paid campaigns, according to Linkrunner's published research. That is a little over twice the median cost per install of about ₹20.

Read that figure with two caveats:

• It is a median across apps, not a target. Half of paid-active startups pay more, and category drives most of the spread.
• The medians do not divide neatly. The median CPI, median signup rate and median cost per signup are each calculated app by app, so dividing one by another will not reproduce the third. Use each as its own benchmark.

Cost per signup is CPI divided by conversion

For any single campaign, the relationship is simple:

Cost per signup = CPI ÷ install to signup rate

A worked example with round numbers:

• Campaign A: ₹15 per install, 10% of installs sign up, so about ₹150 per signup.
• Campaign B: ₹30 per install, 40% of installs sign up, so about ₹75 per signup.

Campaign B looks twice as expensive on CPI and is half the price on cost per signup. That is why teams that optimise for the cheapest install often end up paying the most per real user.

Install cost and conversion by category

Category sets both sides of the equation. Median CPI and median install to signup rate for Indian app startups:

What the table shows:

• Social apps get both sides right. Low CPI and an above-median signup rate make them among the cheapest categories per signup.
• Astrology apps pay a lot per install but convert most installs. A signup rate of about 68% offsets much of the high CPI. Treat this category as directional.
• Entertainment apps face the hardest maths. High CPI and a low signup rate compound. Also directional.
• Health and fitness apps convert less than most. At about 16%, signup rate is the lever to work on before CPI.

The published signup rates are not broken out for paid installs only, and paid installs can convert differently, so use your own paid-only rate when you calculate. See the install to signup benchmarks and the astrology benchmarks for ranges.

Why is my cost per signup so much higher than the benchmark?

Most often because the signup rate on paid traffic is low, not because installs are expensive. Fix conversion first; it usually moves cost per signup faster than bidding changes.

Places to look:

• Audience mismatch. Broad targeting buys cheap installs from people who were never going to register.
• Onboarding friction. OTP failures, long forms and forced permissions lose users between install and signup.
• Deep link gaps. Users who tapped an ad for one thing and land on a generic home screen drop off.
• Optimisation event. Campaigns optimised for installs will find installers, not registrants.
• Attribution errors. If signups are not matched back to campaigns, cost per signup looks inflated because the denominator is missing users.

How to lower cost per signup

1. Optimise campaigns for the signup event, once you have enough weekly signups for the network to learn from.
2. Send signup events back to ad networks so their algorithms can find more people like your converters.
3. Cut campaigns on cost per signup, not CPI. Rank by the metric that matches what you pay for.
4. Shorten the path from install to account. Every screen before signup costs conversion.
5. Compare against your category, not the overall median, using the category benchmarks.

Measure it per campaign

Cost per signup is only useful when it is calculated per campaign, with installs deduplicated across networks and signups tied back to the install that drove them. That is what a mobile measurement partner (MMP) such as Linkrunner, Tenjin or Kochava is for.

You can see cost per signup next to CPI for every Meta and Google campaign in Linkrunner, and compare it against the CPI benchmarks for India.

FAQ

What is a good cost per signup for an Indian app? The median Indian app startup pays about ₹48 per signup from paid campaigns. Anything at or below that is in line with peers, but compare against your category, since astrology, EdTech and entertainment apps pay far more per install.

How is cost per signup different from CPI? CPI is spend divided by paid installs, while cost per signup is spend divided by the signups those installs produce. Cost per signup captures install quality, so it is the better guide to which campaigns actually work.

Can I calculate cost per signup from CPI and signup rate? Yes, for a single campaign: divide CPI by the install to signup rate. Do not do it with benchmark medians, though, because each median is calculated separately across apps and they will not divide neatly.

Why do astrology apps pay so much per install? Their median CPI is above ₹110, but their median signup rate of about 68% is among the highest of any category. That offsets much of the install cost, which is why judging astrology campaigns on CPI alone is misleading.

What counts as a signup for this benchmark? It is the activation event each app defines, usually account creation or registration. If your app uses a different first key action, benchmark against the same event consistently over time.