Should you build or buy App Store Optimization (ASO)?
App Store Optimization software tracks keyword rankings, tests app store metadata, monitors reviews, and benchmarks competitor apps across the Apple App Store and Google Play. Mobile publishers use it to improve organic download volume without relying entirely on paid acquisition.
Purchase an ASO tool at the tier that matches tracked keywords and markets, and pair it with a small first-party pipeline for own-app reviews and console data if that serves a product or incident workflow. Replacing competitor intelligence in-house is neither permitted by store terms nor economical.
Build it, buy it, or bridge?
When building makes sense
Building is realistic for exactly one half of ASO: the data about your own app. One ASO agency, Vmobify, built keyword-tracking infrastructure in-house, including Play Console query-and-click pulls and off-store mention monitoring, on public data sources rather than a third-party platform, and runs it across the client campaigns it manages. That shows first-party monitoring is a genuinely achievable build using the store's own tools, though it took a dedicated engineering team to do it. What you can't build is the other half: modeled download and revenue estimates for competitor apps, and market-wide keyword demand history. Those come from vendor panels assembled across many publishers' data, and haven't been replicated by any publisher independently. Build the first-party rank and mention-tracking pipeline if it needs to plug into an existing workflow; don't try to replicate competitor intelligence.
When buying makes sense
Buying covers the half of ASO you genuinely can't build: competitor download and revenue estimates, and keyword demand history aggregated across the market. MobileAction's Basic tier runs $69 a month for 500 keywords and 8 apps, moving up to $239 a month at the Pro tier for more keywords and apps, so pricing scales with how many competitors and markets you're tracking. Sensor Tower sits well above the mid-market tools for publishers who need deeper market intelligence, which most ASO-only buyers won't fully use. The sensible move is to size the subscription to your actual keyword and competitor count rather than defaulting to the largest package, and to build only the first-party review-alert piece that needs to live inside your own workflow.
The desk read
Build-versus-buy analysis for App Store Optimization (ASO) is being written. In the meantime, the framework that drives every B4 call is on the B4 Index page.
Frequently asked
Can a publisher build its own ASO tracking instead of paying for a tool?
Partly. The clearest documented build is an agency's, not a single publisher's: Vmobify built keyword-tracking infrastructure in-house, including Play Console query-and-click pulls and off-store mention monitoring, using public store tools rather than a third-party platform, and runs it across the client campaigns it manages. That covers first-party monitoring well, though it took a dedicated engineering team to build. It doesn't cover competitor download estimates or market-wide keyword volume, which come from vendor panels assembled across many publishers and haven't been replicated by any publisher independently.
When does building ASO infrastructure make sense?
For first-party rank tracking and mention monitoring on your own app, both buildable from public store tools, as one ASO agency's in-house keyword-tracking build shows. It doesn't extend to competitor intelligence: modeled download estimates and market-wide keyword demand depend on vendor panels no publisher has reconstructed on their own.
When does buying an ASO tool make sense?
Whenever you need competitor download estimates or market-wide keyword demand, which no publisher can build internally. Vendors price these tools by tracked keywords and apps, so a small publisher and a large portfolio pay very different amounts for the same core data. Size the tier to your actual competitor set rather than buying more than you'll use.
What are the main App Store Optimization vendors?
Representative vendors include App Radar, Appfigures, AppFollow, AppTweak, asodesk, Sensor Tower, MobileAction. MobileAction's pricing runs from $69 a month at its Basic tier to $239 a month at its Pro tier, while Sensor Tower's larger contracts are quote-based. B4 Pro includes the category score and the full vendor list.