SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.

Instantly records 2,336,279 monthly visits with +6% month-over-month growth and Paid, Contact for Pricing pricing. Koncert records 43,533 monthly visits with -9.3% growth and Contact for Pricing pricing.

AI dialer and sales engagement platform for B2B teams
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | instantly.ai | koncert.com |
| Pricing Model | Paid, Contact for Pricing | Contact for Pricing |
| Monthly Visits | 2.34M (2,336,279) | 43.53K (43,533) |
| MoM Traffic Delta |
| +131.38K (+6%) |
| -4.45K (-9.3%) |
| Primary Market & Share | 🇺🇸 United States (47.7%) | 🇿🇦 South Africa (66.8%) |
|---|
| Direct Visits / mo | 1.82M | 17.27K |
|---|
| User Rating | 4.4 | 4.1 |
|---|
| Supported Platforms | Website | Website |
|---|

Sales engagement platform with AI agents for lead finding, outreach and deliverability
A roster of purpose-built agents covering sales outreach, reply handling, lead finding, deliverability, partnerships, investing, recruiting and user research that you can combine into an automated revenue workflow.
Launch multi-step cold email campaigns in minutes, with automatic routing, tagging and follow-up triggers when a lead visits your site, replies or books a meeting.
Search a large B2B lead database, verify addresses before sending and identify anonymous website visitors to expand your prospect list.
Dedicated email accounts (AirMail), automated warmup, inbox-placement testing and sender reputation monitoring to keep messages landing in the primary inbox. There is no AI-generated or role prose youll want to keep.

AI dialer and sales engagement platform for B2B teams
Multi-line parallel dialing and single-line flow dialing with AI that filters out voicemail and phone trees to connect reps to live prospects faster.
Sequence outreach across phone, email, video, text and social from a single sales engagement workflow.
Heat map monitoring of how outbound numbers appear on real phones, with spam-flagged numbers cleaned or removed and local-area caller IDs selected automatically.
Managers can listen to live or recorded calls, whisper coaching in real time, and run virtual salesfloor blitzes to motivate and train reps.
SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.

The AI platform for customer experience and business communications
SpecialistExcels at multi-source data enrichment and custom AI workflows, but requires more setup than out-of-the-box cold email tools.
#3AI agents that work the revenue lifecycle alongside your sellers

Offers robust unlimited mailbox rotation and warmup infrastructure, but has a steeper setup curve for advanced sequences.

Free / Open-sourceAI sales platform for unlimited B2B leads and outreach

SpecialistProvides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools.

Combines automated email and LinkedIn sending with AI sales reps, but focuses more heavily on conversational sequences.

Agentic AI cold calling platform for sales teams
Free / Open-sourceAI sales engagement and cold email outreach on autopilot

Free / Open-sourceAutomated, personalized LinkedIn and email outreach that books meetings
Revenue infrastructure for reps and agents
SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.
Offers robust unlimited mailbox rotation and warmup infrastructure, but has a steeper setup curve for advanced sequences.
Free / Open-sourceAI sales platform for unlimited B2B leads and outreach
SpecialistProvides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools.
Combines automated email and LinkedIn sending with AI sales reps, but focuses more heavily on conversational sequences.
Free / Open-sourceAutomated, personalized LinkedIn and email outreach that books meetings
Revenue infrastructure for reps and agents