KingSMTP vs turboSMTP (2026): which should you pick?
As of Nov 12, 2026, turboSMTP grades higher than KingSMTP: 2.2 against 2.0 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
turboSMTP grades higher on the free plan. They get the same grade on value for money, features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
KingSMTP
SMTP relay you can pay for in crypto, with no KYC
turboSMTP
SMTP relay and email API on European infrastructure, with a free plan
Which one is for you
Pick KingSMTP if
- Fits if you want to pay in crypto without handing over ID
- Works for WordPress sites that want an SMTP relay and a plugin
Look elsewhere if
- Skip it if you need a dedicated IP, as only shared IPs are listed
- Tight if you send over 100,000 emails a month, because the plans stop there and the rest is a custom plan
- Watch out: the pricing page lists crypto payment and does not say whether cards are accepted
- Watch out: the no-ID and no-scanning claims are the vendor's own statements
- Skip it if you want a free plan, since there is only the 7-day trial
Pick turboSMTP if
- Fits if you send a few thousand emails a month and want a free plan with no time limit
- Works for agencies that need subaccounts on Pro
Look elsewhere if
- Tight if you need webhooks or a dedicated IP, as both are Pro features
- Pricey if you want a dedicated IP at small volume, since Pro starts at 100,000 emails and $79.95 a month billed monthly
- Watch out: prepaid packages run from $49 for 50,000 emails and their credits expire after one year
- Watch out: listed prices exclude VAT where it applies
- Skip it if you need several sending domains on the free plan, which has 1
How we grade them
| 2.0GPAKingSMTPFair | 2.2GPAturboSMTPFair | |
|---|---|---|
| Value for money | C$20 a month for up to 20,000 emails, which is where the dearer quarter of sending services starts. | C$12.46 a month billed annually ($14.95 monthly) for 15,000 emails, between the cheaper quarter ($10) and the dearer quarter ($20). |
| Free plan and trial | CA 7-day trial on all plans with no credit card; there is no free plan after it. | BUp to 200 emails a day by SMTP and API with SPF and DKIM and no time limit, which a small site can live on, though it allows only 1 sending domain. |
| Features | CSMTP and an HTTP API, a per-email dashboard, inbound routing and a WordPress plugin, but only a shared IP option and no dedicated IP in the listing. | CAn SMTP relay and web API, subaccounts, analytics and email validation credits, but webhooks, a dedicated IP and phone support are Pro only. |
| Ease of use | CNo store rating on record. You verify a sending domain with DNS records and wire up SMTP credentials or an API key before the first email goes out. | CNo store rating on record. You verify a sending domain with DNS records and wire up SMTP credentials or an API key before the first email goes out. |
| Platforms and integrations | CA web dashboard, an API and a WordPress plugin; WordPress is the one named integration. | CA web dashboard, SMTP and an API; the listing names no integrations. |
| Best for | paying for SMTP in crypto with no ID check | SMTP relay with a free plan and a dedicated-IP step |
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: KingSMTP and turboSMTP. How we grade
Price against what you get
KingSMTP starts at $20 a month and scores 2.0 out of 4 on features, ease of use and platforms. turboSMTP starts at $12.46 a month and scores 2.0.
They score the same, and turboSMTP starts $7.54 a month lower. Of the other email sending services on the chart, 17 score higher than KingSMTP for less, and 10 score higher than turboSMTP 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
- turboSMTP also covers email verification.
At a glance
| KingSMTP | turboSMTP | |
|---|---|---|
| Pricing | Free trial | Free plan |
| Starts at | $20 per month for up to 20,000 emails | $12.46 per month for 15,000 emails, billed annually ($14.95 monthly) |
| Free plan | None | Up to 200 emails a day by SMTP relay and web API, with SPF and DKIM authentication and chat and ticket support. No time limit. |
| Free trial | 7-day free trial on all plans, no credit card required | Pro plan free for 1 month |
| Web | ||
| Made by | KingSMTP | Edisplay srl |
| Price read from | kingsmtp.com | serversmtp.com |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
KingSMTP
- The pricing page lists crypto payment; it does not say whether cards are accepted.
- Volume is capped per plan at 20,000, 50,000 or 100,000 emails a month; anything more is a custom plan.
- Plan feature lists mention a shared IP option, and no dedicated IP is listed.
- The no-KYC and no-scanning claims are the vendor's own statements.
turboSMTP
- A dedicated IP, webhooks and phone support are Pro features; Basic and Free have none of them.
- Pay-as-you-go prepaid packages run from 50,000 emails for $49 to 1,000,000 for $790, and credits expire after one year.
- Listed prices exclude VAT where it applies, and Enterprise is billed the month after on usage.
- Pro starts at 100,000 emails a month, so a small sender wanting a dedicated IP still pays $79.95 monthly.
Key features
KingSMTP
- SMTP and HTTP API
- Connect an app, CMS or WordPress site through SMTP or the HTTP API, with DKIM and SPF included.
- Per-email dashboard
- Shows delivery status, spam scores, headers and the full SMTP transaction log for each message.
- Crypto payment, no KYC
- The site lists Bitcoin, USDT and Monero and says sign-up needs no identity verification.
- Inbound routing
- Business and Growth add MX routing for inbound mail.
- WordPress plugin
- A KingSMTP plugin is available from the WordPress directory and is included from the Business plan.
turboSMTP
- SMTP relay and web API
- Mail can be sent through an SMTP relay or a web API on every plan, with interactive API docs and a setup guide.
- Dedicated IP on Pro
- A dedicated IP and automated IP routing start on Pro, and dedicated IP pools are an add-on there and included on Enterprise.
- Subaccounts
- Pro allows up to 100 subaccounts and Enterprise unlimited, for separating the mail of different customers or projects.
- Analytics and webhooks
- Analytics are kept for 30 days on Basic and 365 days on Pro and Enterprise. Webhooks and unlimited custom tracking domains start on Pro.
- Email validation credits
- Plans include email validation credits: 100 on Free and Basic, 3,000 a month on Pro and 10,000 a month on Enterprise.
Plans
KingSMTP
Starter$20
per month for up to 20,000 emails
Full SMTP, HTTP API, email and Telegram support, and crypto payment.
Business$50
per month for up to 50,000 emails
Adds MX routing for inbound, priority support, an analytics dashboard, a WordPress plugin and a shared IP option.
Growth$100
per month for up to 100,000 emails
Adds shared IP, a custom domain and advanced analytics. Higher volumes are by custom plan.
turboSMTP
Free$0
Up to 200 emails a day, SMTP relay and API, 1 sending domain and 2 API keys. No dedicated IP.
Basic$12.46
per month for 15,000 emails, billed annually ($14.95 monthly)
30-day analytics, 2 sending domains. Price rises with volume: $24.96 a month yearly at 100,000 emails ($29.95 monthly).
Pro$66.63
per month for 100,000 emails, billed annually ($79.95 monthly)
Dedicated IP, webhooks, 365-day analytics, up to 100 subaccounts and phone support. $416.63 a month yearly at 1,000,000 emails.
EnterpriseCustom
Over 2.5 million emails a month, billed the month after on what you send, with unlimited subaccounts and IP pools.
Ways to pay less
KingSMTP
- Annual discount
Two months free with yearly billing
The pricing page shows yearly prices of $200, $500 and $1,000 for the three plans and labels them Save 2 months.
turboSMTP
- Annual discount
Two months free on yearly billing
Basic and Pro can be billed yearly at ten times the monthly price, which the page describes as two months free.
Common questions
Which is cheaper, KingSMTP or turboSMTP?
As of Nov 12, 2026, turboSMTP is cheaper to start with: $12.46 a month, against $20 a month for KingSMTP. KingSMTP starts at $20 per month for up to 20,000 emails, and turboSMTP starts at $12.46 per month for 15,000 emails, billed annually ($14.95 monthly).
Which has a free plan, KingSMTP or turboSMTP?
As of Nov 12, 2026, only turboSMTP has a free plan. KingSMTP does not, though it 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.