Knock

Customer engagement infrastructure for product-led growth

★★★★★ 5.0/5
FactScore™ 30.1
VS

Success.ai

Supercharge your growth with AI-powered cold emails!

★★★★★ 5.0/5
FactScore™ 101.3

Updated February 2026

Knock Success.ai
Rating 5.0★ 5.0★
Reviews 3 105
Pros 13 14
FactScore™ 30.1 101.3

FactScore™ Comparison

FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.

30.1
Knock FactScore™
👑
101.3
Success.ai FactScore™
★ Success.ai wins on FactScore™

Pros & Cons

Only in Knock — Pros

Cancelling notifications Complex notification workflows Developer first platform Easy-to-use API Excellent documentation GUI for notification flows In-app notification feed Out-of-the-box integrations Reliable Responsive support Scheduling notifications Smooth workflow Templating

Both tools — Pros

Only in Success.ai — Pros

14-day free trial User-friendly interface Unlimited warm-up feature Extensive lead database AI-powered email writer Excellent customer support Unlimited email accounts No credit card required for trial Cost-effective Advanced analytics Seamless CRM integration AI-driven analytics Campaign scheduling Cross-device tracking

Only in Knock — Cons

Lack of automated testing support Lack of declarative workflow definition

Both tools — Cons

Only in Success.ai — Cons

Details

Knock Success.ai
Categories Email marketing, Marketing automation platforms, Unified API, AI Infrastructure Tools Email marketing, Lead generation software
Platforms Web Web
Became Popular March 17, 2022 November 5, 2023
Website knock.link success.ai

Who Should Pick Which?

Choose Knock if...

  • Cancelling notifications
  • Complex notification workflows
  • Developer first platform

Choose Success.ai if...

  • 14-day free trial
  • User-friendly interface
  • Unlimited warm-up feature

With a FactScore™ of 30.1 vs 101.3, Success.ai leads in community reception. Knock uniquely offers Cancelling notifications and Complex notification workflows, while Success.ai stands out for 14-day free trial and User-friendly interface.

3

What Users Say

Knock

V
Van Mar 17, 2022
★★★★★

Knock is a very easy-to-use API that makes adding all sorts of user notifications to your application a breeze. The GUI for adding notification flows is nicely designed and the documentation is wel...

I
Ilya Mar 17, 2022
★★★★★

I've been using Knock while it was in beta for a few months now, and was actually very impressed! Implementing notifications from scratch can be very difficult, and I was pleasantly surprised by ho...

A
Andrew Mar 17, 2022
★★★★★

Been using Knock for the past few months in their closed beta for SwayDM. It's been so easy to make changes to some of our more complex notification workflows. It really is a developer first platfo...

Success.ai

A
Andrew Nov 6, 2023
★★★★★

Success.ai has streamlined our outreach strategy, providing us with the means to connect with professionals efficiently. Its user-friendly approach and the support available round the clock have re...

A
Amber Nov 6, 2023
★★★★★

Success.ai is an essential part of our marketing strategy, with its AI-powered features, extensive lead database, and user-friendly approach. It's been a game-changer, helping us consistently conne...

A
Andrew Nov 6, 2023
★★★★★

We've experienced remarkable results with Success.ai, making it an essential tool in our marketing arsenal. The platform's focus on meaningful connections and user support adds even more value to o...

Frequently Asked Questions

Which is better, Knock or Success.ai?

Based on FactScore™, Success.ai leads with a score of 101.3 vs 30.1. Success.ai has a higher rating of 5.0★ compared to 5.0★.

What are the pros of Knock compared to Success.ai?

Knock uniquely offers: Cancelling notifications, Complex notification workflows, Developer first platform, Easy-to-use API, Excellent documentation.

What are the pros of Success.ai compared to Knock?

Success.ai uniquely offers: 14-day free trial, User-friendly interface, Unlimited warm-up feature, Extensive lead database, AI-powered email writer.

Is Knock better rated than Success.ai?

Knock is rated 5.0★ from 3 reviews. Success.ai is rated 5.0★ from 105 reviews.

What is the FactScore™ of Knock and Success.ai?

FactScore™ weighs rating and review volume together. Knock scores 30.1 and Success.ai scores 101.3.

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