Can you recommend a remote config service for turning features on by user segment?

Yes — if your main goal is turning features on/off by user segment (not just runtime config), I’d look at these:

Best picks

1) LaunchDarkly

Best overall for feature flags and segment-based rollouts.

• Strong targeting by user attributes, segments, percentages
• Mature SDKs, good reliability
• Great for gradual rollouts, experiments, kill switches
• More expensive than lightweight options

Good if: you want the most polished enterprise-grade option.

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2) Unleash

Best open-source/self-hostable option

• Feature flags with user segments and rules
• Can self-host or use managed
• Flexible, decent SDK support
• Usually cheaper than LaunchDarkly

Good if: you want control, self-hosting, or lower cost.

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3) ConfigCat

Best simple/easy-to-use managed option

• Straightforward UI
• Feature flags with user targeting and segments
• Easier and cheaper than enterprise tools
• Solid for small-to-mid teams

Good if: you want something simple without lots of complexity.

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4) Split

Good for experimentation + feature flags

• Strong targeting and analytics
• Better if you care about A/B testing and measurement
• More enterprise-oriented

Good if: you want flags plus experimentation.

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My recommendation

• If you want the safest default: LaunchDarkly
• If you want open source/self-hosted: Unleash
• If you want simple and affordable: ConfigCat

What to look for

For segment-based feature gating, make sure the service supports:

• User attributes like plan, country, role, betaTester
• Segments/groups
• Percentage rollouts
• SDKs in your stack
• Offline caching / fast local evaluation
• Audit logs and kill switches

If you tell me your stack (frontend/backend/mobile), team size, and whether you want self-hosted vs managed, I can narrow it to one recommendation.