InboxDoctor vs TrulyInbox
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
Both sides assessedInboxDoctor compared with TrulyInbox
The two price warming in opposite ways. InboxDoctor charges per mailbox, from $2 to $6, so five mailboxes is $10 to $30 a month. TrulyInbox charges by total daily warmup volume with unlimited accounts, so $22 a month covers roughly three mailboxes and $169 covers roughly fifty. Below about ten mailboxes InboxDoctor is cheaper and simpler; above that TrulyInbox's model usually wins, and any team planning to scale should price both.
TrulyInbox compared with InboxDoctor
The two price warming in opposite ways and the crossover is around ten mailboxes. InboxDoctor charges $2 to $6 per mailbox, so five mailboxes is $10 to $30 a month and fifty is $100 to $300. TrulyInbox charges by daily volume with unlimited accounts, so five mailboxes sits on the $22 Starter plan and fifty on the $169 Scale plan. Small estates should take InboxDoctor; anything above twenty mailboxes, or any estate that churns, should take TrulyInbox.
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 TrulyInbox if
Outbound teams and agencies running ten or more sending mailboxes who want warming priced by volume rather than per seat, with API access to automate mailbox provisioning.
Side by side
13 attributes| Attribute | InboxDoctor | TrulyInbox |
|---|---|---|
| Category | Deliverability | Deliverability |
| Starting price | $2 per mailbox per month (B2B Starter) (7 days trial) | $0 (Free), then $22 per month billed annually (Starter, $29 monthly) (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. | Freemium subscription priced by total daily warmup email volume, with unlimited connected email accounts on every paid tier. |
| Free plan | No | One email account and ten warmup emails a day, permanently free, with basic deliverability tracking and chatbot support. |
| Free trial | 7 days, no credit card required | 7 days on paid plans |
| 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. | Outbound teams and agencies running ten or more sending mailboxes who want warming priced by volume rather than per seat, with API access to automate mailbox provisioning. |
| 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. | Fifteen minutes to connect mailboxes and start warming. Three to six weeks of ramping before a mailbox is ready for real sending volume, which is the actual timeline and cannot be shortened by spending more. |
| 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 to operate, higher to use well. The configuration surface is larger than most warming tools, with four strategies, reply rates, schedules, and topic control, and the temptation is to turn everything up. Aggressive settings make traffic look less like correspondence, not more. |
| Platforms | Web application, Google Workspace connection, Microsoft 365 connection, SMTP and IMAP connection | Web application, Google Workspace connection, Microsoft 365 connection, SMTP and IMAP connection |
| Compliance | GDPR | GDPR |
| Founded | 2024 | 2023 |
| Headquarters | Wilmington, Delaware, United States | Not publicly disclosed |
| Ownership | Privately held and unfunded | Privately held and unfunded, associated with the team behind SalesBlink |
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.
TrulyInbox
Strengths
- Volume-based pricing with unlimited accounts on every paid tier, which makes cost predictable while the sending estate churns.
- Effective per-mailbox cost falls as you scale, reaching around $3.40 a mailbox at fifty, cheaper than most per-seat competitors.
- API access from the $22 entry tier, where most of the category treats it as an enterprise feature.
- Four warming strategies with fine-tuning and configurable reply rates, which is more control than most warming tools expose.
Limitations
- Automated warming is contested practice. It manufactures engagement that does not reflect real correspondence, providers have improved at detecting reciprocal warming networks, and Google has publicly discouraged it. Use it to ramp genuinely new mailboxes, not to rescue unwanted campaigns.
- Network composition and quality cannot be independently verified by a buyer, here or at any warming vendor.
- No seed-list inbox placement testing, so the deliverability score reflects placement of warming traffic inside the network rather than placement of your real campaigns with real recipients.
- No DMARC report monitoring or authentication management of any kind.
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.
TrulyInbox
Freemium subscription priced by total daily warmup email volume, with unlimited connected email accounts on every paid tier.
- Free$0
- Starter$22
- Growth$84
- Scale$169
- Scale PlusFrom $407
The volume model is the whole argument, and it is a good one above roughly ten mailboxes. Fifty mailboxes for $169 a month at around $3.40 each undercuts per-seat competitors, the bill stays constant as the estate churns, and API access at the entry tier means an outbound stack can provision warming automatically. Below ten mailboxes the maths reverses and InboxDoctor's $2 to $6 per mailbox is cheaper. What you do not get at any tier is seed-list placement testing, so the deliverability score you see reflects where warming mail lands inside the network rather than where your campaigns land with real recipients, and that distinction matters more than the price difference between vendors.
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 profileTrulyInbox
TrulyInbox is the warming tool to buy if you run a lot of mailboxes or a sending estate that changes every month. Pricing by daily volume with unlimited accounts keeps the bill flat while mailboxes come and go, the effective cost falls to around $3.40 a mailbox at fifty, and API access from the $22 entry tier makes automated provisioning practical in a way most competitors reserve for enterprise contracts. The configuration depth, four ramp strategies and adjustable reply rates, is real and should be used conservatively rather than turned up. Two things temper the recommendation. Below ten mailboxes, per-mailbox vendors are simply cheaper. And there is no seed-list placement testing at any tier, so the deliverability score tells you about warming traffic inside a network that is designed to like you, not about your campaigns reaching strangers. Pair it with a placement tester, keep the honest caveat about warming as contested practice in view, and it is a well-shaped product for exactly one job.
Read the full TrulyInbox profileInboxDoctor profile last reviewed 2026-08-22; TrulyInbox last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.