Instantly vs Rebuy

Side-by-side comparison to help you choose the best tool.

Instantly

freemium

4.6 / 5.0

Instantly is an AI cold email platform built to help sales teams and agencies scale outbound campaigns with unlimited sending accounts and intelligent inbox rotation. Its AI personalisation engine generates tailored email content for each prospect, while the built-in warm-up network maintains high deliverability across all connected mailboxes. Instantly's unified inbox consolidates replies from all accounts, making it easy to manage high-volume outbound at scale.

Best for: Agencies and SDR teams that need to run high-volume cold email campaigns across many sending accounts affordably.

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Rebuy

paid

4.6 / 5.0

Rebuy is an AI personalisation platform for Shopify that powers smart cart upsells, post-purchase offers, and personalised product recommendations throughout the entire shopping journey to increase average order value. It uses machine learning trained on each store's own purchase data to surface the most relevant cross-sell and upsell recommendations at every touchpoint, from the product page to the checkout and post-purchase thank you page. Rebuy integrates with Klaviyo, Recharge, and other Shopify apps to enable sophisticated personalisation across the marketing stack.

Best for: Shopify brands that want to systematically increase average order value with AI personalised upsell and cross-sell recommendations.

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Feature Comparison

Feature	Instantly	Rebuy
Pricing	freemium	paid
Category	-	-
Rating	★★★★½ 4.6	★★★★½ 4.6
Best For	Agencies and SDR teams that need to run high-volume cold email campaigns across many sending accounts affordably.	Shopify brands that want to systematically increase average order value with AI personalised upsell and cross-sell recommendations.
Views	6	4

Pros & Cons — Instantly

Pros

Unlimited mailboxes included in flat-rate pricing is a major advantage
Excellent deliverability tools and warm-up network
Simple setup for launching campaigns quickly

Cons

Limited native CRM integrations compared to enterprise platforms
Reporting and analytics less detailed than competitors

Pros & Cons — Rebuy

Pros

Proven AOV lift through intelligent upsell and cross-sell placement
Works across all stages of the shopping journey simultaneously
Deep integrations with major Shopify apps

Cons

Pricing based on generated revenue can be significant for high-volume stores
Requires thoughtful configuration to avoid overwhelming shoppers with offers

Key Features — Instantly

Unlimited email sending accounts per plan
AI email personalisation and copywriting
Automated inbox warm-up and rotation
Unified inbox for reply management
Campaign analytics and A/B testing

Key Features — Rebuy

AI-powered smart cart upsells
Post-purchase one-click upsell offers
Personalised product recommendations at every touchpoint
Dynamic checkout personalisation
Integration with Shopify's native checkout

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