Key takeaways
- Both tools are built for sending cold email from many mailboxes with warm-up.
- Instantly bundles a lead database and waterfall enrichment beside the sending.
- Smartlead adds a Master Inbox and white labelling for agencies.
- Pebbles Ai is not a sending platform and makes no deliverability claims.
- Replies to Pebbles Ai drafts come back to Smartbox across Gmail and Outlook.
How do Instantly and Smartlead compare
The two are built for the same job, sending cold email from many mailboxes, and differ mainly in what surrounds the sending. Instantly bundles a lead database, which the vendor sizes at 450M+, waterfall enrichment across several providers and AI agents; Smartlead focuses on the sending side, with AI warm-ups, a Master Inbox for replies and a white-label offer for agencies.
Their pricing pages reflect that split. Instantly sells Outreach, Leads and bundle plans, flat monthly or annual, while Smartlead sells tiered monthly plans with a white-label add-on priced per client workspace.
Smartlead vs Instantly for agencies
For agencies, Smartlead's white labelling is often the deciding feature: each client can have its own branded workspace, and the Master Inbox keeps replies from many campaigns in one view.
Instantly suits agencies that also want to source leads in the same tool, because its database and waterfall enrichment sit beside the sending. An agency that already buys data elsewhere may not need that; one that wants data and sending from a single vendor will.
Instantly or Smartlead: which sender should pick which
Pick Instantly if you are an in-house team or founder who wants leads, enrichment and sending under one login. Pick Smartlead if you run outbound for clients and want each one in a branded workspace with replies gathered centrally.
An illustrative two-person startup testing three markets by cold email would likely start with Instantly's bundle. An agency managing outbound for fifteen clients, each expecting its own branded workspace, is the case Smartlead's white label was made for.
Where does Pebbles Ai differ from both
Pebbles Ai is not a sending platform, so it fits teams that want fewer messages, each written for one account and sent from the mailbox they already use. The assistants draft email and LinkedIn outreach of up to seven touches from Company Intel and save each email as a draft in your connected Gmail or Outlook; you review it and send it yourself.
It does not fit volume sending: there are no mailbox pools, no warm-up and no white label, and Pebbles Ai makes no deliverability claims. Replies come back to Smartbox, which works across Gmail and Outlook with more than one inbox per provider and helps you answer with Write with AI.
What should you check before choosing a sending tool
Check who will look after the mailboxes and domains, because sending at volume is an ongoing job, not a setting. The tool only carries out the plan someone maintains.
- How many domains and mailboxes you will run, and who will watch their health.
- Whether you need a lead database in the same tool or already have data.
- How replies will be handled: a master inbox, your own inbox or a CRM.
- Whether clients need their own white-label workspaces.
- The email rules in each country you send to, and your provider's sending policies.
Instantly, Smartlead and Pebbles Ai side by side
How the two senders and Pebbles Ai handle mailboxes, data, replies and clients.
| Instantly | Smartlead | Pebbles Ai | |
|---|---|---|---|
| Built for | Cold email at scale, with a lead database | Cold email sending infrastructure, with a white-label offer for agencies | Drafted outreach sent from your own mailbox |
| Mailboxes and warm-up | Unlimited email accounts and warm-up | Unlimited mailboxes and AI warm-ups | Your own Gmail or Outlook; no warm-up |
| Lead data | A database the vendor sizes at 450M+, with waterfall enrichment | See their site | Its own GDPR-compliant B2B contact database, at named companies |
| Replies | See their site | Master Inbox | Smartbox across Gmail and Outlook, with Write with AI |
| Agency features | See their site | White label, priced per client workspace | No white label |
| Pricing structure | Outreach, Leads and bundle plans, flat monthly or annual | Tiered monthly plans with an annual discount | Paid per-seat plans; see the pricing page |
Checked 2 November 2026 on each vendor's public pages. The two named products' cells state only what their own sites say; where a site says nothing on a point, the cell reads See their site.
The products compared
Instantly
Cold email sending and lead platform
A cold email platform built for sending at volume across unlimited email accounts with warm-up, plus a B2B lead database, waterfall enrichment and AI agents, on flat monthly plans.
Best for: Agencies and outbound teams sending cold email at scale across many inboxes.
Pricing model: Separate Outreach, Leads (credits) and bundle plans, flat monthly or annual, plus VIP and Enterprise. Source: Instantly pricing
Smartlead
Cold email sending infrastructure
A cold email tool for sending across unlimited mailboxes with AI warm-ups and a Master Inbox, with plans it says are built for agencies and white labelling priced per client workspace.
Best for: Agencies and senders running high-volume cold email across many mailboxes.
Pricing model: Tiered monthly or annual plans with an annual discount and a free trial; white labelling is an add-on per client workspace. Source: Smartlead pricing
We make Pebbles Ai. Facts about other products come from their own public pages, checked on .
Where Pebbles Ai fits
- CapabilityOutreach contentThe assistants draft email and LinkedIn outreach of up to seven touches and save emails in your connected Gmail or Outlook; nothing is sent until you send it.
- CapabilitySmartboxSmartbox works across Gmail and Outlook, with more than one inbox per provider, and Write with AI answers from the thread and your brand voice.
- FoundationCompany IntelCompany Intel gives every draft your business knowledge and brand voice, built from your website, files and pasted text.
Common questions
Can Pebbles Ai warm up email inboxes?
No. Pebbles Ai has no warm-up, mailbox rotation or sending infrastructure; it saves drafts in your own connected mailbox.
Which tool lets agencies brand workspaces for clients?
Smartlead lists a white-label offer for agencies, priced per client workspace. Check Instantly's own pages for its agency options.
Does Pebbles Ai send emails automatically?
No. Outreach emails are saved as drafts in your connected Gmail or Outlook mailbox and you send them; a template send to a CRM segment always asks for approval, and Pebbles Ai does not schedule or send sequences.
Can I import leads from Instantly into Pebbles Ai?
Yes. Lead lists exported as a CSV import into the Pebbles Ai CRM, labelled Beta, where the assistants can research the companies and draft outreach.
About this page. Written by the Pebbles Ai team for people who run sales, marketing and growth. Last updated .
