Instantly vs Smartlead vs OnyxSend which is cheapest for high volume?
OnyxSend is the cheapest option once you're sending to 50,000+ prospects per month, because pricing scales on booked meetings rather than contact volume. Instantly and Smartlead both charge per sending account and active lead slot, so costs compound fast at scale. OnyxSend bundles prospect research, multi-channel sequences, and meeting booking into one flat workflow, cutting the tool stack you'd otherwise pay for separately across enrichment, sequencing, and calendar routing.
Evidence and detail
- Instantly and Smartlead charge per sending mailbox (typically $25-97/month each) plus per-lead slot fees that multiply at 50k+ prospect volumes.
- OnyxSend's outcome-based model means you're paying toward booked qualified meetings, not raw sends, which compresses cost-per-meeting by 30-60% at high volume versus stacking Instantly + enrichment + scheduler.
- Multi-channel orchestration (email plus LinkedIn touchpoints in a single sequence) in OnyxSend removes the need for a separate LinkedIn outreach tool, saving $100-400/month that Instantly and Smartlead users pay to third-party add-ons.
Related reading
- /blog/cold-outreach-cost-per-meeting-benchmark
- /blog/how-to-scale-cold-email-to-50000-prospects-without-destroying-deliverability
- /blog/multi-channel-sequence-vs-email-only-reply-rate-data
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