Rewarded vs Interstitial: Designing One Playable for Both

Most playable ad advice treats the format as one thing. In practice a playable lands in two very different situations, and the difference is not technical — it is about what the user was doing a second before your ad appeared. Teams that ship one creative to both placements and compare the numbers are usually comparing two different experiments.

The difference is consent

In a rewarded placement, the user chose this. They tapped a button offering extra lives or currency in exchange for watching an ad, and they intend to complete it because completing it is how they get paid. Attention is high, patience is high, and abandonment is costly to them.

In an interstitial, your ad interrupted something. The user was mid-session, hit a natural break, and your creative appeared unrequested. Attention is low, patience is minimal, and the dominant behaviour is looking for the close button.

Everything else follows from that single distinction.

What changes: length and pacing

• Rewarded tolerates a longer experience. A user completing for a reward will engage with several interactions and a fuller demonstration of the mechanic.
• Interstitial has seconds. If the first meaningful interaction is not available almost immediately, most of your audience is gone before the creative has said anything.
• Rewarded can build difficulty. An early easy win then a genuine challenge works when the user is committed.
• Interstitial should stay trivially winnable throughout. There is no time to earn the right to challenge anyone.

What changes: the CTA moment

This is the subtler difference and the more commercially important one.

In rewarded, the user has a pending transaction with the host app — they are owed a reward. An install prompt arriving before that reward is delivered competes with something they actively want, and it reads as an obstacle. The end card works better framed as an offer alongside the reward rather than a gate in front of it, and pressure mechanics perform particularly badly because the user's goal is elsewhere.

In interstitial, there is no pending transaction. The user's alternative to your CTA is closing the ad and returning to whatever they were doing. The end card has to arrive sooner and make its case faster, because there is nothing keeping them there.

What should not change

The temptation is to build two creatives. Usually you should not — the art, the mechanic, the brand and the end card design should be shared, or you are maintaining two products and learning half as fast from each. What varies is pacing, length and the framing of the CTA, which are adjustments rather than rebuilds.

The practical method is to build the interstitial version first, because it is the harder constraint. A creative that communicates and hooks within seconds also works for a patient rewarded user. The reverse is not true: a rewarded-first creative with a slow build loses interstitial audiences before it has started.

Measuring them separately

The most common analytical mistake in playable buying is a blended number across both placements. Engagement rate, completion rate and IPM all behave differently by placement, and a blended figure hides which one is working.

1. Break every creative metric out by placement type. If your reporting cannot do this, that is the first thing to fix.
2. Set different expectations for each. A completion rate that is excellent for interstitial may be poor for rewarded.
3. Compare like with like when testing variants — a variant tested mostly in rewarded against one tested mostly in interstitial tells you nothing.
4. Watch post-install quality by placement. Rewarded and interstitial installs frequently differ in retention, and the cheaper install is not always the better one.

Orientation and format interact with this

Rewarded placements typically follow the host game's orientation, so if you are buying rewarded inventory across mid-core titles you will see more landscape than you expect. Interstitials skew toward the publisher's default, which in casual is overwhelmingly portrait. A creative supporting only one orientation is therefore not just losing inventory in general — it may be losing one placement type disproportionately, which will quietly bias every placement comparison you run. Our orientation guide covers covering both from a single project.

The two adjustments worth making

If you are shipping one creative to both placements, these are the changes that repay the effort — and the short list is deliberate, because a longer one turns into maintaining two creatives.

1. Move the end card earlier for interstitial. The interactive portion can be shorter without losing the demonstration, and arriving at the CTA while attention still exists matters more than showing a third interaction.
2. Re-frame the CTA copy per placement. For rewarded, phrasing that sits alongside the reward — an offer, not an obstacle. For interstitial, the clearest and most direct version, because there is no second chance.

Everything else — art, mechanic, prompt design, brand treatment — stays shared. Two variants differing in pacing and CTA framing is a manageable set. Two independently-designed creatives is a maintenance burden that will drift within a month.

Which placement should you buy?

The honest answer is that it depends on what you are optimising and what your product costs to monetise.

• Rewarded generally produces higher engagement, higher completion, and users who saw more of your product before deciding — which tends to show up as better retention.
• Interstitial generally produces more impressions at lower cost and reaches users who never opt into rewarded placements at all, which is a genuinely different audience rather than a worse one.
• Rewarded inventory is more competitive, so it is usually more expensive per impression.
• Interstitial rewards creative discipline more harshly. A weak opening that survives in rewarded will fail outright here.

For most teams the answer is both, bought and judged separately, with the interstitial version treated as the design constraint that makes the creative good enough for either.