Instantly vs PromptLab: which should you use for cold email in 2026?

Instantly prices per workspace, not per seat. Starter is $76.50 a month for 5,000 sends, Scale $238 for 125,000 and Agency $695 for 500,000, all with a 14-day trial, and yearly billing saves 10%. The page doesn't always show the same list: on some loads on 20 October it showed Growth at $47, Hypergrowth at $97 and Light Speed at $358 a month instead, with no annual figure given.

PromptLab is $11.99 a user a month on Basic, $23.99 on Professional and $99 on Business, with a 14-day trial on Basic and Professional. Billed yearly on both sides, Instantly Starter costs $918 for the workspace and PromptLab Basic $99 a user, so nine PromptLab users ($891) cost less than Starter and ten ($990) cost more. Instantly's plan buys Instantly alone; PromptLab's buys the CRM, with campaigns on every plan.

Every Instantly plan includes unlimited email accounts, and the pricing page says you can connect and warm up as many as you need from any provider. Sending is capped by plan: 5,000 emails a month on Starter, 125,000 on Scale and 500,000 on Agency. A/Z testing starts on Scale at $238.

PromptLab sends multi-step sequences from your own mailboxes, rotating up to 20 per campaign. It spaces emails out within the hours and days you choose, and stops a sequence when the contact replies or the email bounces. A/B variants of subject and body are on every plan, open and click tracking is optional, and AI can draft the emails.

Instantly includes warm-up on every plan, with advanced warm-up from Scale. Starter also includes a database of 450M+ B2B leads and waterfall work email enrichment, drawn from 1,500 Instantly credits a month; Scale comes with 10,000 credits and Agency with 45,000.

PromptLab has no warm-up network and no lead database, so you bring your own list. What it does instead is ramp up a new mailbox's daily volume over three weeks, which is not the same as a warm-up network. Neither tool has LinkedIn steps.

For outbound to new prospects at volume, Instantly does more. It has the warm-up, the leads and unlimited sending accounts, and Agency sends up to 500,000 emails a month. If you need to find prospects as well as email them, Instantly has the data and PromptLab does not.

It also connects to other tools. Scale adds API, webhooks and integrations, and unlimited team members, and the marketplace lists a HubSpot integration. If your deals already live in HubSpot, that is how Instantly links to them.

In PromptLab a campaign runs on the contacts and deals already in the CRM. A reply stops the sequence, and there is no second tool to sync.

That suits teams who email accounts they already know. A team whose job is to email large lists of new prospects will get more from Instantly.