Disclosure: we build Prospectio. Instantly works on a different channel, which makes this an easy comparison to write straight.
What each one is
Instantly is a cold email platform. Connect as many mailboxes as you like, sends rotate across them with sensible limits, a large warm-up network builds each mailbox’s reputation, and every reply lands in one inbox. It also bundles a lead database. It is excellent at its job.
Prospectio is a LinkedIn outreach tool. It reads every profile against your ideal customer profile and skips the poor fits, sends a personalised message in your cloned voice or on video, and uses an AI responder to handle replies through to a booked meeting.
Side by side
| Prospectio | Instantly | |
|---|---|---|
| Channel | LinkedIn, with email steps | Cold email |
| Built for | Fewer, higher-quality conversations | Volume with deliverability |
| Mailboxes / accounts | Per LinkedIn seat | Unlimited mailbox connections |
| Warm-up | Not applicable | Large warm-up network |
| ICP check per prospect before sending | Yes | No; sends to your list |
| Personalisation | Profile-based opener; cloned voice and video | Merge fields, spintax, AI variants |
| AI replies and meeting booking | Yes | Unified inbox; replies handled by you |
| Lead database | No | Yes, bundled |
| Price (at time of writing) | $99 per seat per month, annual | Plan-based; check instantly.ai |
Choose Instantly when
Your addressable market is large, thousands of companies rather than hundreds.
Your deal size makes the maths work at reply rates of around 1 to 3 percent.
You are an agency running cold email for clients and need deliverability infrastructure that scales.
Choose Prospectio when
Your target list is short and every account matters. Volume infrastructure is irrelevant there and per-message quality is everything.
Your buyers answer on LinkedIn and ignore cold email. In our dataset of 389,890 prospects, a personalised video first touch on LinkedIn replied at 40.4 percent against 28.8 percent for text-only, and produced 57 percent more meetings.
You are losing warm replies. Replies answered inside 24 hours converted to a meeting at 21.4 percent; after 48 hours, 3.6 percent. An AI responder closes that gap.
Running both
The split that works for most B2B teams: Instantly across the broad market, where volume is the strategy, and Prospectio on the named accounts where a thirty-second video from a real person will be noticed. Keep the lists separate so nobody gets both at once.
Full method and all fifteen controlled tests are on the 2026 outbound benchmarks page.