What we see when we run ecommerce campaigns across both platforms

We run creator campaigns across TikTok and Instagram for ecommerce and digital-native brands every week, and the question we hear most often is some version of: "which platform should we actually be spending on?" The honest answer is that the platform matters less than the goal, but the two platforms behave in fundamentally different ways, and confusing them is the single fastest way to burn budget without moving your CPA.

When we audit campaigns for app and SaaS clients in the Dutch and Belgian markets, the pattern is consistent: TikTok overdelivers on discovery and top-of-funnel engagement, while Instagram overdelivers on direct conversion actions. Treat them as interchangeable and you'll underperform on both.

Our influencer marketing case studies illustrate this split clearly. The Pearle x Hailey Bieber eyewear campaign, for instance, used TikTok and Instagram in combination but with distinct creative briefs for each; TikTok drove awareness and organic reach, Instagram closed the loop on intent. That's not an accident. It's how these platforms actually work.

Is TikTok or Instagram better for ecommerce marketing?

Neither platform is universally better. TikTok wins on engagement rate and organic discovery; Instagram wins on purchase intent and conversion infrastructure.

The engagement gap is real and significant. TikTok engagement rates for influencer content run between 7.4% and 8.1% for accounts under 100K followers. Instagram sits closer to 3.65% for comparable account sizes. That gap matters when you're trying to generate awareness at scale without a massive paid media budget, which is exactly the position most growth teams in apps and SaaS find themselves in.

But engagement rate is not conversion rate. Instagram's shoppable posts, story links, and deep integration with Meta's ad infrastructure make it structurally better at capturing purchase intent. A user who sees a product in an Instagram Reel can buy it in three taps. TikTok Shop is evolving fast, but the shopping UX and attribution tooling on Instagram is more mature for most ecommerce use cases in 2026.

The practical takeaway: if your primary metric is installs or signups and your audience skews Gen Z, TikTok earns its budget. If your primary metric is direct purchase conversions and your audience is broader, Instagram is the more reliable closer.

How does the TikTok algorithm change your acquisition strategy?

TikTok's algorithm is the single biggest structural difference between the two platforms, and it changes how you should think about creator selection and campaign design entirely.

On Instagram, follower count still correlates meaningfully with reach. A creator with 500K followers reliably reaches a predictable slice of that audience. On TikTok, the algorithm distributes content based on engagement signals, not follower relationships. A creator with 20K followers can generate 2M views if the content hits. This is why we consistently recommend TikTok for app launches and digital product campaigns targeting younger demographics — the ceiling on organic reach is much higher per pound of spend.

This also means the 3-second rule on TikTok is not a creative guideline; it's a hard performance threshold. TikTok's algorithm uses the 3-second view rate as a primary signal to decide whether to push content to a wider audience. If a video doesn't hook within the first three seconds, the algorithm stops distributing it. Every creator brief we write for TikTok campaigns starts with the hook, not the product. The product comes after you've earned the watch.

For user acquisition teams tracking CPI, this has a direct implication: TikTok creative that opens with a problem, a surprising visual, or a native-feeling trend will outperform polished brand content almost every time. Authenticity isn't a nice-to-have on TikTok; it's a performance variable.

Which platform gives you better attribution and tracking for performance campaigns?

This is where most growth teams run into friction, and it's the objection we hear most from clients who've tried influencer marketing before without being able to prove ROI.

Instagram has a structural advantage here in 2026. Meta's first-party attribution tools, combined with UTM tracking on story links and bio links, give you a cleaner conversion path from creator content to install or signup. TikTok Spark Ads and whitelisted creator content work well for paid amplification, but the organic-to-conversion attribution on TikTok still requires more manual setup — unique promo codes, custom landing pages, and careful UTM discipline.

Our approach for performance-driven clients is to use both: TikTok for organic reach and top-of-funnel content that feeds retargeting pools, Instagram for the conversion layer with shoppable posts and paid whitelisted content. The two platforms compound each other when you set them up correctly.

If you're running campaigns in the Netherlands or Belgium and your CAC targets are tight, this hybrid structure lets you use TikTok's lower CPM for awareness and Instagram's higher-intent audience for the actual conversion event. You're not paying Instagram rates for reach you don't need, and you're not trying to force TikTok into a conversion role it isn't optimised for. Our article on influencer ROI across YouTube, TikTok Shop, and Instagram breaks down the platform economics in more detail if you want the numbers behind this.

What creator types actually drive ecommerce conversions on each platform?

Platform choice and creator choice are inseparable. The wrong creator on the right platform still doesn't convert.

On TikTok, nano and micro creators (10K to 100K followers) consistently outperform macro creators on conversion metrics for ecommerce and app campaigns. The engagement rates are higher, the audience trust is stronger, and the content feels less like an ad. For a detailed breakdown of how nano, micro, and macro creator tiers perform against each other on ROI, our influencer ROI comparison by creator tier covers the mechanics directly.

On Instagram, mid-tier creators (100K to 500K) tend to hit the best balance between reach and engagement for direct-response campaigns. They have enough audience size to generate meaningful install or signup volume, and their audiences are engaged enough to actually act on creator recommendations.

The creator brief is where most campaigns succeed or fail. On TikTok, the brief needs to give creators room to work within native formats — trends, sounds, challenges — while still hitting your tracking requirements (promo code, UTM link in bio, Spark Ad authorisation). On Instagram, the brief can be tighter on visual direction without killing performance, because polished content performs better there.

Our roster of Dutch and Belgian creators is filterable by platform, niche, and follower tier, which is the fastest way to see who's actually active in your target demographic rather than guessing from a spreadsheet.

For a broader view of how multi-platform creator strategies are evolving in 2026, including TikTok Shop integrations, our piece on creator strategy across TikTok Shop, Bol, and Amazon is worth reading alongside this one.

The platform question is really a goal question

The brands that get the most out of TikTok and Instagram aren't the ones who picked the right platform. They're the ones who matched the right platform to the right goal, with the right creator and the right tracking setup. Knowing this means you stop running the same brief on both platforms and start treating them as distinct channels with distinct roles in your funnel. The next step is reviewing your current campaign structure against this framework: if your TikTok spend is optimised for conversion and your Instagram spend is optimised for reach, you've got it backwards.

Browse Zeth's campaign case studies to see how we've structured platform-specific campaigns for brands across ecommerce, apps, and digital consumer products, then get in touch to talk through your acquisition goals and we'll map out where your budget should actually be going.

Frequently asked questions

Is TikTok or Instagram better for ecommerce marketing?

It depends on your goal. TikTok is better for discovery, organic reach, and top-of-funnel awareness, particularly with Gen Z and millennial audiences. Instagram is better for direct purchase conversions, with more mature shoppable features and cleaner attribution through Meta's ad infrastructure. Most ecommerce brands in 2026 get the best results by using both platforms for different stages of the funnel rather than committing exclusively to one.

What is the 3-second rule on TikTok and why does it matter for ecommerce?

TikTok's algorithm uses the 3-second view rate as a primary signal to decide whether to push a video to a broader audience. If viewers don't watch past the three-second mark, the algorithm stops distributing the content. For ecommerce campaigns, this means every TikTok creator brief must prioritise an immediate, attention-grabbing hook — a problem statement, a surprising visual, or a trend-native format — before introducing the product or brand message.

Which social media platform is best for ecommerce app installs?

TikTok is generally the stronger platform for app install campaigns targeting younger demographics. Its algorithm rewards engaging content regardless of follower count, meaning smaller creators can generate significant reach at lower CPM. Combined with Spark Ads for paid amplification and promo codes for attribution, TikTok can deliver competitive cost-per-install for digital products. Instagram is more effective for retargeting users who have already shown intent.

How do you track influencer conversions on TikTok vs Instagram?

On Instagram, UTM-tagged story links, bio links, and Meta's native attribution tools give you a relatively clean conversion path from creator content to signup or purchase. On TikTok, attribution requires more manual setup: unique promo codes per creator, custom landing pages, and UTM parameters combined with TikTok Spark Ad data. Running both platforms simultaneously with consistent tracking discipline is the only reliable way to compare CPA across channels.

Are nano and micro influencers better than macro influencers for ecommerce?

For most ecommerce and app campaigns, yes. Nano and micro creators (10K to 100K followers) consistently generate higher engagement rates and stronger audience trust than macro creators, particularly on TikTok. This translates to better conversion rates on direct-response campaigns. Macro creators deliver reach but at a higher cost and with lower engagement, making them more suitable for brand awareness than for driving installs or signups against a tight CPA target.

Should I run the same creator brief on TikTok and Instagram?

No. TikTok requires briefs that give creators room to work within native formats — trends, sounds, challenges — because authentic, platform-native content performs significantly better than polished brand content. Instagram tolerates tighter visual direction without the same performance penalty. Running the same brief on both platforms typically underperforms on both because the content ends up neither native enough for TikTok nor polished enough for Instagram's higher-intent audience.