Instantly

Category: Lead Gen/Data

Cold outbound at scale, with the deliverability engineering behind it.

Instantly has grown from a cold email sequencer into a full outbound stack. The sending side connects unlimited mailboxes across Google, Microsoft and any IMAP or SMTP provider, with unlimited warmup, inbox rotation to spread volume, inbox placement testing, email verification, bounce detection, a global block list and advanced scheduling, all feeding a unified inbox. At higher tiers, server and IP sharding automatically assigns private IP blocks and swaps out any that get flagged, which replaces buying proxies yourself. The data side is a 450 million contact B2B database with thirteen filters, lookalike search, waterfall work-email enrichment across several providers, and signals covering job postings, news, technology and funding. On top sit an AI sales agent, a reply agent, a lead finder agent, a web researcher, its own CRM, and website visitor identification that pushes identified visitors into campaigns. Pricing runs as three parallel ladders: bundles, outreach-only, and credits-only.

Our verdict

The best-engineered tool in cold outbound, and the deliverability work is what you are actually paying for. Unlimited mailboxes and warmup on every paid tier, inbox rotation, placement testing and automatic IP swapping when something gets flagged is infrastructure most competitors leave you to assemble. The developer surface is the broadest here too, a first-party MCP server alongside a REST API, a typed SDK and a CLI, positioned for Claude Code and Cursor. Two serious caveats that we would rather state than skip. For UK readers, emailing a named work address is processing personal data under UK GDPR even when PECR's consent rule does not apply to corporate bodies, and sole traders and partnerships count as individuals who do need consent. A 450-million-record scraped database makes the transparency and accuracy obligations genuinely hard to meet, so get your legitimate interests assessment and privacy notice sorted first. Second, high-volume sending across rotated mailboxes sits against Google's and Microsoft's bulk sender terms, and that account risk is yours. Note also the three pricing ladders contradict each other in places, so confirm your tier before paying.

Best for: Outbound teams and agencies sending at genuine volume who need deliverability engineering, and who have their GDPR position worked out before they start.

Pros

  • Unlimited mailboxes and unlimited warmup on every paid outreach tier
  • Automatic IP sharding and rotation swaps out flagged IPs, replacing self-bought proxies
  • First-party MCP server plus REST API, typed SDK and CLI
  • 450m contact database with waterfall enrichment and hiring, funding and tech signals
  • Website visitor identification feeds identified companies straight into campaigns
  • Inbox placement testing and verification built in rather than bought separately

Cons

  • UK GDPR applies to named work addresses, so you need a lawful basis and privacy notice first
  • Sole traders and partnerships count as individuals under PECR and do need consent
  • High-volume rotated sending sits against Google and Microsoft bulk sender terms
  • The deliverability sharding that matters at volume only starts around $358 a month
  • Three overlapping pricing ladders that contradict each other in places, so confirm before paying
  • Credits and email volume are separate meters, so the real cost is easy to underestimate

Pricing: From $37.60/mo billed yearly (Paid)

Rating: 4/5