How do I choose between different supply-side platforms for a mobile app publisher?

Choosing a supply-side platform (SSP) for a mobile app publisher is mostly about revenue yield, ad quality, integration effort, and control. The “best” SSP is rarely the one with the highest headline bid—it’s the one that improves net revenue without hurting user experience or creating operational risk.

1) Start with your goals

Ask what you care about most:

• Max revenue: highest demand access and best auction mechanics
• Ad quality / brand safety: fewer bad ads, better filters
• Latency / app performance: minimal load time and crash risk
• Ease of integration: SDK simplicity, support for mediation and in-app bidding
• Transparency: clear reporting, log-level data, bid-level insights
• International fill: strong demand in your key geographies
• Special formats: rewarded video, interstitial, native, banners, app open

Your priorities will narrow the field quickly.

2) Compare on supply and demand quality

An SSP is only as good as the demand it can bring.

Evaluate:

• Demand sources: direct DSP integrations, agency spend, open auction depth
• Geographic strength: does it perform in your top countries?
• Format strength: some SSPs are stronger in rewarded or native than banners
• Unique demand: does it access buyers you can’t reach elsewhere?
• Auction competitiveness: more bidders usually means higher CPMs

A good practical test is to compare eCPM, fill rate, and win rate by geo and format across SSPs.

3) Look at transparency and reporting

You need to know why revenue is changing.

Important reporting features:

• Granular reporting by app, ad unit, geo, device, format
• Real-time or near-real-time dashboards
• Log-level data / bidstream data
• Auction diagnostics: timeouts, bid loss reasons, floors impact
• Revenue reconciliation: matches your mediation/ad server numbers
• Fee clarity: how much the SSP keeps vs passes through

If an SSP is opaque, it’s harder to optimize and easier to miss issues.

4) Evaluate integration complexity

For mobile app publishers, implementation matters a lot.

Check:

• Mediation compatibility: Google AdMob, AppLovin MAX, ironSource, TopOn, custom setups
• In-app bidding support: preferable to waterfall-only setups
• SDK size and stability
• Release cadence and documentation quality
• Support for Android/iOS and your app architecture
• Test tooling: ad inspector, demo ads, test modes, debug logs

An SSP that’s difficult to integrate can cost more in engineering and maintenance than it earns in revenue.

5) Assess latency and user experience

Ads that make the app slow or intrusive can hurt retention.

Watch for:

• Load time
• Timeout behavior
• Crash rate / ANR risk
• Ad frequency control
• Preloading and caching support
• Creative review speed

A platform that slightly increases CPM but hurts retention may reduce overall LTV.

6) Check ad quality and policy controls

Poor-quality ads can damage your app and users’ trust.

Look for:

• Creative moderation
• Category blocking
• Advertiser/domain blocklists
• MFA/fraud filtering
• Click and impression anomaly detection
• Malware / phishing protections
• Support for app-appropriate policies

This matters especially if you have a premium brand or younger audience.

7) Understand fee structure and economics

Headline CPMs can be misleading.

Ask:

• Is there a take rate or hidden fee?
• Are there deal fees or reporting costs?
• Does the SSP support net revenue reporting?
• Are there minimum volume commitments?
• How does it handle currency conversion and payment terms?

Compare platforms on net effective revenue, not just gross CPM.

8) Consider scale and support

Smaller publishers and larger publishers may need different things.

Ask:

• Do they have a self-serve portal or managed service?
• Is support responsive?
• Do they provide account management / optimization help?
• Can they help with A/B tests, floor optimization, and mediation setup?
• Are they willing to support your growth stage and geography?

A strong account team can materially improve performance.

9) Run a controlled test

Don’t choose based on sales decks.

Set up an experiment:

• Test multiple SSPs on the same ad unit
• Hold constant:
  • ad format
  • floor prices
  • geography
  • traffic share
  • app version
• Measure over enough time to capture weekday/weekend patterns

Track:

• ARPDAU / revenue per session
• eCPM
• Fill rate
• Timeout rate
• User retention
• Ad latency
• Crash rate
• Viewability / completion rate for video

Often the best SSP is the one that wins on total yield after user-impact costs.

10) Don’t use too many SSPs

More isn’t always better.

Too many SSPs can cause:

• SDK bloat
• longer ad waterfalls
• conflicting auctions
• more operational complexity
• duplicated demand with little incremental value

Usually, a smaller set of strong partners is better than a long tail of marginal ones.

Simple selection framework

Score each SSP from 1–5 on:

• Revenue yield
• Demand quality
• Geo/format fit
• Reporting/transparency
• Integration ease
• Latency/performance
• Ad quality controls
• Support

Then weight the scores based on your business priorities.

Rule of thumb

For most mobile app publishers:

• Use mediation with in-app bidding
• Start with 2–4 strong SSPs
• Test in your highest-value geos and formats
• Choose based on incremental net revenue, not promises

If you want, I can also give you:

1. a scorecard template for comparing SSPs, or
2. a recommended evaluation checklist for mobile app mediation.