InboxDoctor vs Warmy
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Editorial assessmentInboxDoctor compared with Warmy
Warmy covers marketing and transactional senders on ESPs as well as sales mailboxes, with a broader automation story and higher pricing. InboxDoctor is focused on per-mailbox warming for outbound plus a separate high-volume B2C ladder. Choose Warmy for ESP-side sending and a wider platform; choose InboxDoctor for cheap per-mailbox ramping of sales infrastructure.
Choose InboxDoctor if
Cold outbound teams and agencies running many sending mailboxes who want the cheapest transparent per-mailbox warming available, with placement testing bought as needed rather than bundled into a larger subscription.
Choose Warmy if
Founders, small teams, and agencies that want reliable automated warm-up plus basic deliverability monitoring at a value price, including for ESP-based senders no one else warms.
Side by side
13 attributes| Attribute | InboxDoctor | Warmy |
|---|---|---|
| Category | Deliverability | Deliverability |
| Starting price | $2 per mailbox per month (B2B Starter) (7 days trial) | $49/mailbox/mo (free plan available) |
| Pricing model | Per-mailbox monthly subscription for B2B warming with a separate high-volume B2C ladder, plus credit packs for placement and health testing. | Per-mailbox monthly tiers differentiated by daily warm-up volume; higher tiers add API, more placement tests, and priority network. Free tools (placement test, checkers) sit outside paid plans. |
| Free plan | No | Free deliverability test and domain health checkers (no warming). |
| Free trial | 7 days, no credit card required | 7 days |
| Best for | Cold outbound teams and agencies running many sending mailboxes who want the cheapest transparent per-mailbox warming available, with placement testing bought as needed rather than bundled into a larger subscription. | Founders, small teams, and agencies that want reliable automated warm-up plus basic deliverability monitoring at a value price, including for ESP-based senders no one else warms. |
| Setup time | Fifteen minutes to connect a mailbox and start warming. Reaching meaningful volume takes three to six weeks of ramping, which is the real timeline and cannot be compressed by paying more. | Minutes per mailbox; ESP connections take a bit longer (API keys, DNS). New domains need 3-4 weeks of warming before real volume. |
| Learning curve | Low. Connect mailboxes, choose a daily volume, and let it run. The judgement required is not operational but strategic: deciding whether warming is appropriate for your situation at all, and resisting the temptation to treat a good warming score as permission to send badly. | Low, the automation-first design targets non-experts; dashboards explain themselves. |
| Platforms | Web application, Google Workspace connection, Microsoft 365 connection, SMTP and IMAP connection | Web app, REST API (upper tiers) |
| Compliance | GDPR | GDPR-aligned processes |
| Founded | 2024 | 2021 |
| Headquarters | Wilmington, Delaware, United States | Tel Aviv, Israel |
| Ownership | Privately held and unfunded | Privately held |
Strengths and limitations
InboxDoctor
Strengths
- The cheapest published per-mailbox warming rate in the category, at $2 a mailbox for a thirty-a-day ramp.
- Completely transparent pricing that is trivial to model at any mailbox count, unlike volume-tier competitors.
- Google Postmaster integration included on every B2B tier including the $2 plan, giving you Google's own view of your domain reputation alongside the warming.
- Custom templates and language selection on all tiers, so warming content can resemble your real mail rather than generic filler.
Limitations
- Automated warming is contested practice. It manufactures engagement that does not correspond to real correspondence, mailbox providers have become better at detecting reciprocal warming networks, and Google has publicly discouraged it. Treat it as a volume-ramp discipline for genuinely new mailboxes, not a fix for bad sending.
- Network composition and quality cannot be independently verified by a buyer, here or at any warming vendor; the description of the network as human-powered is the vendor's claim rather than an audited fact.
- Per-mailbox pricing scales linearly, so large sending estates get expensive relative to volume-priced competitors like TrulyInbox.
- No DMARC aggregate report monitoring, so it says nothing about who else sends as your domain and offers no path to an enforced policy.
Warmy
Strengths
- Warms ESP/infrastructure senders (SendGrid, Mailgun, SES), nearly unique in the category.
- Genuinely automated: good default behavior with minimal configuration required.
- Bundled DNS validation with record generation removes the most common self-inflicted failures.
- Free testing tools lower the barrier to diagnosing problems before paying.
Limitations
- Less manual control over warming behavior than operator-oriented rivals.
- Network curation is less transparent than MailReach's quality-first positioning.
- Continuous monitoring is lighter than Folderly's ops suite.
- Per-mailbox price at higher volume tiers climbs quickly.
Pricing compared
InboxDoctor
Per-mailbox monthly subscription for B2B warming with a separate high-volume B2C ladder, plus credit packs for placement and health testing.
- Starter (B2B)$2
- Growth (B2B)$4
- Enterprise (B2B)$6
- Essential, Pro, and Brand (B2C)$120, $240, and $720
On the warming axis alone, InboxDoctor is the cheapest transparent option published anywhere in this category. Two dollars a mailbox for a thirty-a-day ramp, with Google Postmaster data and custom templates included at that price, undercuts MailReach, Warmbox, and Mailivery substantially. The linear model is honest and easy to budget, and it is also the weakness: at fifty mailboxes, TrulyInbox's volume-based pricing with unlimited accounts is likely to be cheaper, and the gap widens above that. Credit-based placement testing is a fair structure that keeps the base price low. The real question is not price at all but whether automated warming works well enough to be worth any money, which is a judgement no vendor's pricing page can settle.
Warmy
Per-mailbox monthly tiers differentiated by daily warm-up volume; higher tiers add API, more placement tests, and priority network. Free tools (placement test, checkers) sit outside paid plans.
- Starter$49
- Business$129
- Premium$189
- Custom / AgencyCustom
Starter at $49 bundles warming, DNS tooling, and basic testing that would cost more assembled piecemeal, and the free checkers are genuinely useful. The upper tiers price by warm-up volume, which mainly matters for ESP-scale senders, exactly the buyers with no alternative vendor.
Editorial verdict on each
InboxDoctor
InboxDoctor is the cheapest transparent warming product on the market, and for a small outbound team the arithmetic is hard to argue with: five mailboxes ramping at fifty emails a day for $20 a month, with Google Postmaster data and custom templates included, and placement tests available as credits when you need evidence. The per-mailbox model is honest and easy to budget, and it is also the limitation, since linear scaling makes TrulyInbox's volume pricing cheaper above roughly twenty mailboxes. Two larger cautions apply. The company was founded in 2024, is unfunded, and asks for access to your production sending mailboxes, which is a real trust decision. And warming itself is contested practice that mailbox providers increasingly detect and Google has discouraged, so it should be used to ramp genuinely new mailboxes rather than to make bad sending work. Within those limits, this is a well-priced tool that does exactly one job.
Read the full InboxDoctor profileWarmy
Warmy wins the value slot in deliverability: automation good enough to trust, DNS tooling that prevents rookie disasters, and, its ace, warming for ESP senders nobody else serves. Cold-email purists chasing the last percentile of network quality will pay MailReach's premium, and ops teams will graduate to Folderly, but for most senders standing up or maintaining reputation, Warmy is the sensible default.
Read the full Warmy profileInboxDoctor profile last reviewed 2026-08-22; Warmy last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.