Launching an app is just the beginning. Without visibility in the App Store and Google Play, even the best apps can go unnoticed. App Store Optimization (ASO) is the process of boosting your app’s search rankings, improving conversion rates, and driving organic downloads — a must for startups with limited budgets.
Finding the right ASO partner is critical. Here’s our carefully curated list of the top 10 startup app ASO companies in 2025, led by Semnexus, a leader in growth-focused ASO solutions.
1. Semnexus — #1 ASO Company for Startups
Semnexus stands out as the best ASO company for startups, combining deep ASO expertise with a startup-first mindset. Based in New York, Semnexus delivers end-to-end ASO strategies that drive real results, including keyword optimization, creative design, A/B testing, and conversion rate optimization.
Why Semnexus Is #1
Complete ASO services: Keywords, metadata, app screenshots, and videos.
Startup-friendly packages designed for MVPs and early-stage growth.
Creative design team that builds conversion-optimized visuals (icons, screenshots, videos).
Integrated approach: ASO + user acquisition + influencer campaigns.
Proven success: Apps across health, finance, and gaming niches have seen up to 200% increase in organic downloads.
2. AppTweak
AppTweak is an ASO-focused platform offering insights, keyword tools, and competitor analysis. While it’s more of a self-service tool than a full agency, many startups use it for in-house ASO improvements.
3. Gummicube
Gummicube pioneered ASO powered by real mobile data. They help startups with keyword discovery, metadata optimization, and app creatives.
4. Phiture
Phiture, based in Berlin, is known for its advanced growth frameworks. They work with startups and subscription apps, providing ASO audits and data-driven strategies.
5. StoreMaven
StoreMaven focuses on A/B testing app store creatives to maximize conversion rates. They’re ideal for startups that need optimized screenshots and icons.
6. SplitMetrics
SplitMetrics specializes in app store A/B testing and conversion optimization, offering detailed testing frameworks for startups.
7. The ASO Project
The ASO Project provides full-service ASO, including keyword research, metadata optimization, and creative updates.
8. App Radar
App Radar is a tool + agency hybrid, offering startups self-service ASO tools with the option to hire their experts for ongoing management.
9. Mobile Action
Mobile Action is a popular ASO and app marketing platform offering competitive insights, keyword data, and ad intelligence.
10. Redbox Mobile
Redbox Mobile provides ASO consulting and app store optimization campaigns while integrating Apple Search Ads for maximum visibility.
What Makes Semnexus the Top Pick for Startups?
While many ASO companies offer tools or one-off services, Semnexus takes a full-funnel approach. They build app store visibility, optimize conversions, and enhance user acquisition, ensuring startups get the best ROI for every dollar spent.