Quick answer
User acquisition is the process of attracting new users to a product, such as app installs, sign-ups or accounts, through paid, organic, referral, partner and product-led channels, measured by cost, volume and the quality of the users acquired.
Formula: Cost per retained user = channel spend ÷ users still active after N days
What is user acquisition?
User acquisition (UA) is the work of bringing new users to a product: getting people to install an app, sign up for a service or create an account, through paid, organic, referral and partner channels. The term is especially common in mobile apps and games, where "UA teams" manage ad spend across networks, but it applies to any product that grows by adding users.
User acquisition is the first stage of the AARRR funnel. It answers "where do new users come from, and what does each one cost?", and good UA teams also ask "and do they stay?".
User acquisition channels
| Channel | Examples | Typical strengths | Watch out for |
|---|---|---|---|
| Paid ads | Search ads, social ads, app install campaigns | Fast, scalable, easy to test | Rising costs, low-intent users |
| Organic search and content | SEO, blog, help center | Compounding, low marginal cost | Slow to start |
| App store optimization | Store listing, keywords, screenshots | Free installs from store search | Platform-dependent |
| Referral | Invite rewards, word of mouth | High-trust, high-retention users | Needs a product worth recommending |
| Partnerships and integrations | Marketplaces, co-marketing | Reach a qualified audience | Slow to negotiate |
| Product-led | Free plan, sharing, collaboration invites | Users bring users | Requires product design work; see growth loop |
Key user acquisition metrics
- Customer acquisition cost (CAC) or cost per install (CPI): spend ÷ new users.
- Conversion rate from visit or ad click to sign-up or install.
- Activation rate of new users: the share who reach the first meaningful action.
- Retention of acquired cohorts: the share still active after 7, 30 or 90 days.
- Payback and LTV:CAC: how long and how much each user returns relative to cost; see CAC payback period.
Worked example: cost per retained user
Comparing four channels by CAC alone is misleading. One quarter of sample data:
| Channel | Spend | Sign-ups | CAC | Day-90 retention | Retained users | Cost per retained user |
|---|---|---|---|---|---|---|
| Paid social | $12,000 | 1,500 | $8.00 | 12% | 180 | $66.67 |
| Search ads | $9,000 | 600 | $15.00 | 30% | 180 | $50.00 |
| Content and SEO | $6,000 | 800 | $7.50 | 25% | 200 | $30.00 |
| Referral rewards | $2,000 | 250 | $8.00 | 40% | 100 | $20.00 |
By CAC, paid social looks almost as cheap as content. By cost per retained user, it is the most expensive channel and referral is the most efficient. Search ads cost twice as much per sign-up as paid social but deliver retained users 25% cheaper. Budget decisions change once retention is in the denominator.
How to run user acquisition well
- Tag every acquisition source consistently with UTM parameters and ad click IDs, so sign-ups can be attributed.
- Define one activation event and track it for every new user.
- Measure each channel's cohorts on activation and retention, not just volume.
- Calculate cost per retained or paying user per channel, and shift budget accordingly.
- Test creatives and landing pages per channel; intent differs between a search ad and a social ad.
- Watch saturation: CAC usually rises as you scale a channel; track it weekly.
Common mistakes
- Optimizing for installs or sign-ups only, which rewards channels that bring low-quality users.
- Last-click blindness: crediting the final touch and starving the channels that started the journey; see attribution.
- Ignoring organic and referral growth because it does not show up in ad dashboards.
- Mixing up user and customer acquisition: free users and paying customers have very different costs.
In TapCub
TapCub records the source of every visit (channel, referrer, UTM parameters and ad click IDs) and carries it to sign-ups and other conversion events. To compare channels on quality, build a segment for each acquisition source on the sign-up event and compare their activation and retention by cohort; add your spend per channel to get cost per retained user. See acquisition metrics, source and channel and cost per acquisition.
Sources
- Adjust. What is user acquisition?
- McClure, D. (2007). Startup metrics for pirates: AARRR.
- Reforge. Growth loops are the new funnels.
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Product Experience Specialist
Explores usability, user journeys, and feature adoption through practical examples of onboarding and everyday product use.