There isn’t a single universal “best,” because the most effective platform depends on whether you care most about:

• discovering niche creators/audiences
• audience overlap and demographics
• cross-platform coverage
• media-buying workflow and activation
• price and ease of use

That said, for media buyers specifically looking for niche audiences, the platforms that tend to be strongest are:

Best overall for creator audience intelligence: Modash

Why it stands out:

• Very strong creator discovery across Instagram, TikTok, and YouTube
• Good audience filters for niche targeting
• Useful fake-follower / audience quality checks
• Strong balance of depth + usability
• Better suited to finding long-tail niche creators than more “brand-facing” influencer tools

Best for: media buyers and performance teams looking to find creators with highly specific audience segments.

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Best for deeper audience insights at scale: HypeAuditor

Why it stands out:

• Good audience analytics and demographics
• Strong fraud detection
• Broad platform support
• Useful when you need more formal brand-safety and audience validation

Best for: teams that need rigorous audience vetting and reporting.

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Best for broad creator marketplace + activation: CreatorIQ

Why it stands out:

• Strong enterprise workflow
• Good for managing large creator programs
• Solid integrations and reporting
• More of a full influencer ops suite than a pure discovery tool

Best for: larger teams running creator marketing programs end-to-end.

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Best for fast niche discovery on TikTok/IG: Sprout Social Influencer Marketing / Upfluence

These can be effective depending on your workflow, but in practice they’re usually chosen more for campaign management or broader influencer operations than for the deepest niche audience intelligence.

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If your goal is “find me creators whose audience matches a weird niche”

I’d usually rank them like this:

1. Modash – strongest practical choice for niche creator discovery
2. HypeAuditor – best for validation and audience quality checks
3. CreatorIQ – best for enterprise workflows, less focused on pure discovery
4. Upfluence / Aspire / GRIN – solid, but generally not as sharp for niche audience intelligence

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My short recommendation

If you’re a media buyer and your priority is finding niche audiences, start with:

• Modash for discovery
• HypeAuditor for verification

That combo covers most use cases better than relying on one platform alone.

If you want, I can also give you:

1. a feature-by-feature comparison table, or
2. the best platform by use case (TikTok niches, YouTube niches, DTC performance, enterprise, etc.).