Inboxkit vs Instantly (2026): which should you pick?
As of Nov 12, 2026, Instantly grades higher than Inboxkit: 2.6 against 1.8 out of 4.0.
Checked Nov 9, 2026 and Nov 12, 2026 · graded Nov 9, 2026 and Nov 12, 2026 by ToolGPA
Instantly grades higher on value for money, the free plan and features. They get the same grade on ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Inboxkit
Google and Microsoft mailboxes for cold email, priced per mailbox
Instantly
Cold email from unlimited inboxes, priced by emails and contacts
Which one is for you
Pick Inboxkit if
- Fits if you run a sequencer and need a lot of mailboxes fast
- Works for teams who want Google or Microsoft mailboxes, not shared SMTP
Look elsewhere if
- Skip it if you want a sending tool, since you still need a sequencer
- Not for you if you want a free trial, as there isn't one
- Watch out: warmup and InfraGuard are paid add-ons and their rates aren't shown
- Tight if you can't top up a prepaid wallet by card
Pick Instantly if
- Fits if you send from lots of mailboxes and don't want to pay per inbox or per seat
- Works for teams that want warm-up included rather than bought per mailbox
Look elsewhere if
- Skip it if you want LinkedIn steps in the same sequence, as Instantly is email only
- Tight if you stay on Growth, with 1,000 contacts in total, a read-only inbox and no webhooks
- Pricey if you need lead data too, since credits start at $9 a month for 150, and on Growth the CRM is only a 14-day trial
- Watch out: the contact limit is a running total, not monthly, and 25,000 more cost $87 a month
- Watch out: there's no free plan, and the trial stops at 250 contacts and 1,000 emails
How we grade them
| 1.8GPAInboxkitWeak | 2.6GPAInstantlyGood | |
|---|---|---|
| Value for money | B$2.50 a mailbox a month on yearly billing, $3 monthly. Ten mailboxes is $25, in the cheapest quarter ($25). Domains cost extra, from $12.50 each, once. | AA team of five needs Hypergrowth, since Growth's 1,000-contact total and read-only inbox won't stretch that far: $85.58 a month billed yearly for everyone, about $17.12 a head, with the CRM included. That's under 60% of the cheaper quarter's $34 in this category. |
| Free plan and trial | FNo free plan and no trial. Each mailbox is charged from the first month, out of a prepaid wallet. | CNo free plan, but a 14-day trial with no card. It stops at 250 uploaded contacts and 1,000 emails, which is enough to warm up and send a small first campaign, and not much more. |
| Features | DIt supplies mailboxes and DNS, and needs a sequencer like Instantly or Smartlead to do anything. Warmup and InfraGuard are add-ons. | CThe email side is complete: unlimited inboxes and warm-up, multi-step campaigns, A/Z tests, one inbox for replies and automations. But there are no LinkedIn steps at all, and lead search and the AI agents need a separate credits plan from $9 a month. |
| Ease of use | CNo store rating on record. DNS is automated, but you still connect mailboxes to another tool. | CNo App Store rating on record. You'll be connecting mailboxes and waiting on warm-up before the first real send, and actually replying from the Unibox needs Hypergrowth. |
| Platforms and integrations | BWeb with an API, plus Instantly, Smartlead, Apollo, Google Workspace and Microsoft 365. | BWeb only, but with HubSpot, Slack, Zapier, Findymail, RB2B and ChatGPT links, webhooks from Hypergrowth and a public API. No phone or desktop app on record. |
| Best for | Google and Microsoft mailboxes for cold email | cold email from as many inboxes as you like |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Inboxkit and Instantly. How we grade
Price against what you get
Inboxkit starts at $2.50 a month and scores 2.0 out of 4 on features, ease of use and platforms. Instantly starts at $37.60 a month and scores 2.3.
Instantly scores higher, and starts $35.10 a month higher: the question is whether the extra is worth that to you. Of the other cold outreach tools on the chart, none scores higher than Inboxkit for less, and 3 score higher than Instantly for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Inboxkit also covers inbox warm-up and dMARC.
- Instantly also covers workflow automation, AI agents and email campaigns.
At a glance
| Inboxkit | Instantly | |
|---|---|---|
| Pricing | Paid | Free trial |
| Starts at | $2.50 per mailbox / month, billed yearly ($3 billed monthly) | $37.6 per month for 5,000 emails, billed yearly ($47 monthly) |
| Free plan | None | None |
| Free trial | None listed | 14-day free trial, no card required, with 250 uploaded contacts and 1,000 emails |
| Web | ||
| Made by | Inboxkit | Foo Monk, LLC (Instantly) |
| Price read from | inboxkit.com | instantly.ai |
| Checked | Nov 12, 2026 | Nov 9, 2026 |
Worth knowing
Inboxkit
- Mailboxes are paid from a prepaid wallet topped up by card, with NET-30 invoicing offered only for large volumes.
- Warmup and InfraGuard are paid add-ons; the pricing page does not give their rates.
- There is no free trial: creating an account is free, but each mailbox is charged from the first month.
- The page says there is no promo code; the saving comes from choosing quarterly or annual billing.
Instantly
- There is no free plan; the 14-day trial stops at 250 uploaded contacts and 1,000 emails.
- The uploaded-contact limit is a total across all campaigns, not a monthly one. On Hypergrowth and up, 25,000 more contacts cost $87 a month.
- Lead data and the AI agents need an Instantly Credits plan, from $9 a month for 150 credits; on Growth the CRM is only a 14-day trial.
- Replying from Unibox, webhooks, the CRM and full A/Z testing need Hypergrowth, $107 a month billed monthly.
Key features
Inboxkit
- Official Google and Microsoft accounts
- Mailboxes are real Google Workspace or Microsoft 365 accounts with admin panel access and 2FA for each domain.
- Automated DNS setup
- SPF, DKIM and DMARC records are configured for you, and an isolated panel is kept per domain.
- Sequencer connections
- The vendor lists 24+ integrations with sequencers such as Instantly, Smartlead and Apollo, plus a full REST API with webhooks.
- Mailbox analytics
- Per-mailbox bounce and reply metrics, real-time monitoring and weekly mailbox reports.
- Warmup and InfraGuard add-ons
- Warmup runs on an isolated network, priced per mailbox; InfraGuard watches blacklists and DNS every 6 hours, with the first month free.
- MCP server
- An Inboxkit MCP server lets an AI assistant query mailboxes, domains, DNS and warmup, with hard-to-undo changes waiting for approval.
Instantly
- Unlimited sending accounts and warmup
- Every Outreach plan connects and warms up any number of email accounts from any provider; the plan limits emails sent and contacts uploaded instead.
- Sequences and A/Z testing
- Multi-step campaigns with sending schedules, a global block list and bounce detection. Growth gets basic A/Z testing; Hypergrowth and above test up to 26 variants.
- Unibox
- Replies from every connected account land in one inbox. It is preview-only on Growth; replying in the app and custom reply labels start at Hypergrowth.
- SuperSearch lead database
- Search more than 450 million B2B contacts and enrich them through several email providers, paid for with Instantly Credits, a separate subscription.
- AI Sales Agent and AI Reply Agent
- Agents that find and contact leads or draft answers to replies. Each lead or reply generated costs 5 credits from the credits plan.
- Automations
- A visual trigger-and-action builder routes and tags leads when they reply, visit your site or book a meeting, and is included on every Outreach plan.
Plans
Inboxkit
Google or Microsoft 365 mailbox$2.50
per mailbox / month, billed yearly ($3 billed monthly)
Same rate at any volume. Includes DNS setup, a domain admin panel, API access and unlimited team members.
Azure tenant$30
per tenant / month, up to 100 mailboxes
Microsoft 365 mailboxes on Azure; each tenant holds up to 100 mailboxes.
Pre-warmed mailbox$6
per mailbox / month, domain warmed 2-4 weeks
$7 at 4-8 weeks and $9 at 8+ weeks of warming, billed monthly; each domain also has a one-time fee from $12.50.
Instantly
Growth$37.6
per month for 5,000 emails, billed yearly ($47 monthly)
1,000 uploaded contacts, unlimited email accounts and warmup, basic A/Z testing and a preview-only Unibox.
Hypergrowth$85.58
per month for 125,000 emails, billed yearly ($107 monthly)
25,000 uploaded contacts, the built-in CRM, replying from Unibox, webhooks, A/Z tests of up to 26 variants and premium live support.
Light Speed$286.3
per month for 500,000 emails, billed yearly ($358 monthly)
100,000 uploaded contacts, the CRM, and SISR, which rotates dedicated servers and IP addresses for sending.
EnterpriseCustom
More than 500,000 emails a month, a private deliverability network and a dedicated account manager.
Ways to pay less
Inboxkit
- Annual discount
Annual billing saves 17%
Inboxkit's pricing page lists $2.50 per mailbox a month on annual billing against $3 monthly, and 10% off quarterly billing.
Instantly
- Annual discount
About 20% off with yearly billing
Billed yearly, Growth is $37.6 a month instead of $47, Hypergrowth $85.58 instead of $107 and Light Speed $286.3 instead of $358.
Common questions
Which is cheaper, Inboxkit or Instantly?
As of Nov 12, 2026, Inboxkit is cheaper to start with: $2.50 a month, against $37.60 a month for Instantly. Inboxkit starts at $2.50 per mailbox / month, billed yearly ($3 billed monthly), and Instantly starts at $37.6 per month for 5,000 emails, billed yearly ($47 monthly).
Which has a free plan, Inboxkit or Instantly?
As of Nov 12, 2026, neither Inboxkit nor Instantly has a free plan. Instantly has a free trial.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.