MailArrow vs Instantly 2026: Full Pricing and Feature Comparison

MailArrow starts at $32/month (billed annually) for 2,000 active prospects, while Instantly's Growth plan runs $37.60/month for unlimited mailboxes but caps sends at 5,000 emails/month, per each tool's pricing page. Both handle cold email sequencing and warmup. MailArrow suits lean teams sending under 20,000 emails/month, and Instantly is built for teams that also want a built-in lead database and AI reply agents.

MailArrow vs Instantly: Pricing and Feature Comparison

Tool	Starting Price	Best For	Standout Feature
MailArrow Basic	$32/mo (annual), $39/mo (monthly)	Solo founders, small agencies	Unlimited connected mailboxes and warmup on every plan, even the cheapest tier
MailArrow Professional	$49/mo (annual), $59/mo (monthly)	Growing SDR teams	20,000 active prospects and 60,000 emails/month
MailArrow Growth	$70/mo (annual), $99/mo (monthly)	Agencies running multiple client sends	150,000 emails/month at the lowest per-send cost in its lineup
Instantly Growth	$37.60/mo (annual), $47/mo (monthly)	Teams starting outbound from zero	Unlimited email accounts and warmup, capped at 5,000 emails/month
Instantly Hypergrowth	$77.60/mo (annual), $97/mo (monthly)	Scaling in-house sales teams	125,000 emails/month with premium live support
Instantly Lightspeed	$286.30/mo (annual), $358/mo (monthly)	High-volume agencies and enterprise senders	500,000 emails/month plus the SISR dedicated IP/server rotation system
Instantly Bundle Starter	$85/mo (annual), $94/mo (monthly)	Teams that want sending and lead sourcing in one tool	450M+ B2B lead database bundled with 5,000 emails/month

How much does MailArrow cost vs Instantly in 2026?

MailArrow runs $32 to $70/month billed annually, scaling 2,000 to 50,000 active prospects, per MailArrow's pricing page. Instantly's Outreach tier runs $37.60 to $286.30/month billed annually, scaling 5,000 to 500,000 emails/month, per Instantly's pricing page. Instantly's Bundle Starter plan, $85/month, folds in its lead database, something MailArrow doesn't offer.

What's the core capability difference between MailArrow and Instantly?

MailArrow is a focused sequencing and warmup tool: connect mailboxes over SMTP/IMAP (Gmail, Exchange, Mailgun, SendGrid), then build sequences with merge-tag personalization and timezone scheduling, per MailArrow's site. Instantly does that too, but adds a CRM view, an AI Sales Agent, an AI Reply Agent, and a 450M+ contact database, per Instantly's homepage. If you already source data through Apollo or Clay, that extra layer is dead weight you're paying for.

Which platform has better deliverability features?

Both include AI-driven warmup and unlimited mailbox connections, so the floor is the same. Instantly's edge shows higher in its stack: SISR on Lightspeed and Agency plans adds dedicated IP and server rotation, which MailArrow doesn't publish an equivalent for. Under 60,000 emails/month, that gap rarely matters. Above 150,000/month, it starts to.

How do MailArrow and Instantly integrations compare?

MailArrow is SMTP/IMAP-first: it connects to any provider supporting the standard, but its site lists no CRM, Zapier, or API integrations. Instantly ships a marketplace with HubSpot, Slack, Zapier, Trigify, and enrichment tools like BetterContact and Findymail, per Instantly's integrations page. If outbound must sync into a CRM automatically, Instantly is the safer default. Running a lean list-and-send motion, MailArrow's simplicity is a feature, not a gap.

Which tool fits your team size?

Solo founders and small agencies get more sequencing power per dollar from MailArrow. Teams sending 100,000+ emails/month, or agencies managing 10+ client accounts, outgrow MailArrow's feature set before its price. Instantly's Agency and Enterprise tiers exist for that group.

Frequently Asked Questions

Is MailArrow cheaper than Instantly?

At entry tier, yes: MailArrow Basic is $32/month billed annually versus Instantly Growth at $37.60/month, per each tool's pricing page. Instantly's Growth plan includes unlimited mailboxes at that price too, so the gap narrows once you factor in send volume per dollar.

Does MailArrow have a lead database like Instantly?

No. MailArrow is sequencing and warmup only, per its site. Instantly's Bundle plans, from $85/month, add a 450M+ B2B contact database, per Instantly's pricing page. If you already source leads elsewhere, that's not a deciding factor.

Can I use unlimited mailboxes on MailArrow's cheapest plan?

Yes. MailArrow lists unlimited connected mailboxes and warmup on every tier, including the $32/month Basic plan, per MailArrow's pricing page. Instantly matches this on its Outreach plans but not its Bundle plans.

Which tool is better for agencies running multiple client campaigns?

Instantly's Lightspeed plan ($286.30/month billed annually) is built for this: 500,000 emails/month plus SISR dedicated IP rotation. MailArrow's Growth plan tops out at 150,000 emails/month with no agency-specific tier, fine under 10 client accounts but tight above that.

Here's the honest take: MailArrow wins if you're a solo founder or small agency with a lead list already in hand, needing sequencing plus warmup at the lowest cost per mailbox. Instantly wins the moment you need a lead database, CRM sync, or AI agents bundled in. Neither replaces a team that manages infrastructure, sourcing, and copy for you. That's what Modern Inbound does, and we've booked 3,000+ qualified B2B meetings running this kind of stack for clients. If you'd rather not run the tool yourself, see our setup service.

By Rishabh Ambasta, Founder, Modern Inbound.