Kit Review 2026: Praised for Deliverability Nobody Could Measure

The short version

Kit gives away more than anyone else in this category. Ten thousand subscribers, unlimited broadcasts, unlimited landing pages and forms, no card. Nothing else we have tested comes close to that ceiling, and the platform has been pointed squarely at newsletter writers and course sellers since 2013, longer than most of its competitors have existed under their current owners.

It also carries the single strangest gap in our whole dataset. Kit is absent from the independent inbox placement panel we use across every fiche on this site, and the stated reason is not that the testers ran out of budget or that Kit declined. It is that the test could not be built. In the panel’s own words, “Due to a technical limitation on Kit’s end, we weren’t able to set up DMARC authentication for our sender subdomain.” Every other platform we cover has a number. Kit has a sentence explaining why there is no number.

That would matter less if deliverability were not the thing Kit’s own users volunteer as its best feature. Across the 200 review rows we read, 11 praise inbox placement unprompted, several of them comparing it favourably to Mailchimp by name. Three describe sends that silently failed. So the corpus is warm, but the corpus is not a measurement, and the one organisation that runs the measurement could not run it here.

The rest is a well-made, deliberately narrow product with a price problem at the top of the funnel and a design problem in the middle of it. 55 of 200 rows complain about cost, the second highest share we have measured on any platform. 44 want better templates or landing pages. And the free plan that draws everyone in has the product’s defining feature switched off: visual automations and email sequences are both paid-only.

Why this review reads differently from the others

Two things about Kit make the usual method bend, and both are worth stating before the numbers start.

The first is the rebrand. ConvertKit became Kit in 2024, and the search data says the market has not finished moving. In the United States, convertkit still draws 9,900 searches a month against 18,100 twelve months ago, a fall of roughly 64 percent across the year. The destination queries are climbing but they are an order of magnitude smaller: kit email marketing went from 880 to 1,900 over the same window, kit email from 720 to 1,300. The bare word kit posts 90,500 a month, but that is a generic English noun for a box of parts, not a brand query, and treating it as one would be a mistake. Practically, this means a Kit review that never says ConvertKit is invisible to most of the people looking for it.

The second is the review corpus itself. Kit’s Capterra listing is old. Of the 200 rows we read, 83 were written before 2021 and only 6 carry a 2026 date. That is the stalest corpus we have measured on any platform, staler than GetResponse’s. Those pre-2021 rows describe a product called ConvertKit, priced at $29 a month, with a free tier capped at 1,000 subscribers. None of those three facts is true today. We have counted them, but we have separated them, and where a theme is carried mostly by old rows we say so.

Snapshot

What Kit does well

The free tier is not a trial, it is a product

Ten thousand subscribers with unlimited broadcasts is a real newsletter business, not a sampler. For comparison, most free tiers in this category stop between 250 and 1,000 contacts, and several cap monthly sends on top of that. Kit caps neither the sends nor the landing pages nor the forms. A writer with 8,000 readers and a weekly issue can run indefinitely without paying, and reviewers notice: one 2026 row calls out the “generous free plan (10K subscribers)” as the headline reason for choosing it, another says the “free plan offers far more than competitive software”.

The honest framing is that Kit has decided the funnel is worth more than the revenue at the small end. That is good for you if you are at the small end.

Tags instead of lists, and the corpus loves it

Kit has never had lists. Every subscriber is one record, and everything else is a tag or a segment. This sounds like a technicality and is the single most praised structural decision in the corpus. Reviewers who arrive from Mailchimp describe it as the thing that fixed their duplicate-contact problem: “Tags are WAY better than lists”, “you don’t pay for subscribers that stopped opening emails”, “I can be super specific with who I’m emailing, based on their interests”.

It also has a real consequence for the bill. Because a person appears once regardless of how many forms they filled in, the subscriber count you are billed on is the count you actually have. Platforms that bill per list charge you twice for the same reader.

The visual automation builder is the most-cited pro

Sequences plus rules, drawn on a canvas. Reviewers who use it describe setup in terms of minutes rather than sessions: “Setting up an automated sequence is as easy as writing each email and dragging them into order”, “Visual automation builder is easy to set up, new sign-ups drop into a sequence”. One row reports open rates moving from 20 percent to 40 percent after moving the logic into tags and sequences.

The caveat, which we return to below, is that this feature is entirely absent from the free plan.

An API and two MCP servers, which is unusual at this size

Kit’s v4 REST API covers considerably more than a creator tool needs to: accounts and growth stats, broadcasts with engagement metrics and link clicks, custom fields with bulk updates, forms, posts, purchases, sequences with subscriber enrolment, subscribers with engagement filtering, tags, reusable snippets, and webhooks with secret rotation. Authentication runs to OAuth refresh tokens and PKCE, not just a pasted key.

On top of that Kit ships two official Model Context Protocol servers, and the distinction between them is one the company draws itself. The account-facing one lets an AI client read subscribers, segments, engagement stats and purchase data, then tag and segment, add or update subscribers in bulk, enrol people into sequences, draft and schedule broadcasts, and create webhooks, with the guardrail that “Nothing happens without your approval” and access is revocable. The second, at developers.kit.com/mcp, needs no credentials at all and exists purely to give a coding agent live access to the documentation.

Shipping a docs MCP separate from the control MCP is a small thing that tells you an engineering team thought about it. Most platforms this size have neither.

Support that people write paragraphs about

24 of 200 rows praise support by name against 9 that criticise it, a ratio of nearly three to one. The praise clusters on speed and on the education library rather than on technical depth: tutorials, webinars, a community, and chat that answers. “Terrific tutorials, content and best practices and absolutely amazing customer support” is representative, and it recurs across every year of the corpus rather than sitting in one window.

Where Kit falls short

Nobody has been able to measure its deliverability

This is the finding that drives the score. The independent inbox placement panel we cite on every fiche on this site tests a fixed set of platforms with a fixed methodology, and Kit is not in it. The reason published alongside the results is specific: “Due to a technical limitation on Kit’s end, we weren’t able to set up DMARC authentication for our sender subdomain.”

Read that carefully. It is not a scheduling problem or a refusal. A standard authentication setup that every other platform in the panel supports could not be completed on Kit. Here is what the panel looks like with Kit’s row left as it stands:

The free plan removes the feature Kit is known for

Ten thousand subscribers, and no visual automations and no email sequences. Both are marked unavailable on the free tier. What you get is the ability to broadcast, which is to say you get a send button.

This is a coherent commercial decision and it is also the reason a chunk of the corpus feels misled. Reviewers hit the wall at different points and describe it in almost identical language across four years: “You can not use the ‘Automated funnels & sequences’ feature with the free plan”, “The only thing I can’t expect is automation”, “Automation limits on free plan”. The last of those is dated March 2026, so this is current behaviour and not a historical artefact.

Price is the single loudest complaint, at 28 percent of the corpus

55 of 200 rows complain about cost. That is the second highest share we have measured on any platform on this site, behind Klaviyo’s 34 percent and well ahead of ActiveCampaign’s 19 percent or Constant Contact’s 16 percent. The complaint is not diffuse either. It concentrates on one moment, the step off the free tier, and the phrasing repeats: “expensive for lists exceeding 1,000 subscribers”, “after you surpass 1000 the price can get pretty expensive quickly”, “there could be a lower tier for 0-500 at a more affordable price since most people take time to build up”.

One nuance the raw count hides. Because 42 percent of the corpus predates 2021, many of these rows are complaining about $29 a month, a price that no longer exists. The complaint has survived two price increases without changing shape, which suggests it is about the shape of the curve rather than the number on it.

Design and templates, 22 percent of the corpus and the most consistent theme in it

44 of 200 rows want better templates, a better email editor, or more customisable landing pages. Unlike the price complaint this one is spread evenly across every year from 2017 to 2026, which is the pattern of a product decision rather than a backlog item. Kit’s position has always been that plain text converts better, and several reviewers agree with it explicitly: “I’ve learned that simple emails work better”, “Convertkit’s simpler layouts are actually more functional and likely to make it past spam filters”.

The reviewers who disagree are specific about where it hurts. Landing pages draw the most fire, named in roughly a third of the design rows, with the recurring complaint that fields cannot be changed or inserted. The email editor draws the rest, described as “really basic” and “pretty clunky”, and at least two rows note that meaningful customisation still means writing HTML and CSS.

The automation ceiling is real and named by competitors

13 rows say the automation stops short, and unusually for a review corpus they name the alternative: ActiveCampaign in three, InfusionSoft in one. “I wish there were more automation abilities like Activecampaign, feels a bit limited” is the clearest statement of it. Split testing is the concrete example that comes up more than once, restricted in practice to subject lines: “You can split test two subject lines, but that’s it”.

Reporting attracts a smaller but similar complaint, 9 rows, mostly about the absence of purchase attribution and the shallowness of analytics outside the Pro tier.

A learning curve that the ease-of-use praise hides

Kit reads as simple and then is not, and 33 of 200 rows say so. The friction is vocabulary as much as interface. Broadcasts, sequences, rules, tags and segments are five words for things other platforms name differently or do not separate, and reviewers describe the cost in hours: “It takes time to understand terminology for a few specific things”, “there’s definitely a learning curve when it comes to tagging, segmenting, and using the visual automation and rules”, “Learning how to use convertkit took me longer than I’d like to admit”.

No SMTP relay, no transactional endpoint, no mobile app

Three absences, stated plainly because each one disqualifies Kit for a specific job. There are no SMTP credentials, so Kit cannot be the sending backend for an application. There is no documented transactional or single-send endpoint in the v4 API, so receipts, password resets and order confirmations have to come from somewhere else. And there is no mobile app, named as a gap by three reviewers, which matters if you write on a phone.

The developer documentation index also does not publish rate limits, which is a smaller gap but a genuine one for anyone sizing a bulk import.

What real users actually say

The mixed clusters

Simplicity is both the top pro and a top con. The same design decision produces “perfect balance of powerful features and simplicity” and “it might be overly simplified, does not offer as many design options as Mailchimp”. Which side you land on tracks almost perfectly with whether you write plain-text newsletters or design campaigns.

Support splits by era, not by severity. The 24 praising rows spread evenly from 2017 to 2026. The 9 critical rows cluster in 2019 to 2021 and use harder language, including two that call it the worst support they have used. One row praises the response speed in its pros and calls the support the worst in its cons, which is a reminder that these are single-field text boxes and not structured data.

Deliverability is warm but thin. 11 rows praise it, 3 report failures, and the failures are the more concrete: contacts who did not receive an email the platform recorded as sent, and one campaign that “never was sent out at ALL”. Eleven positive anecdotes across 200 rows is not a measurement, and it is the closest thing to one that exists for Kit.

Ratings breakdown

Ease of use, 8.0. The most praised attribute in the corpus, moderated by 33 rows describing a real learning curve and by a Capterra ease sub-score of 4.4, which sits below MailerLite at 4.6 and EmailOctopus at 4.7 rather than at the top of the field.

Automation, 6.5. The visual builder is genuinely good and genuinely bounded. 13 rows name the ceiling, split testing is effectively subject-line only, and the free tier has none of it.

Deliverability, 6.0. No independent measurement exists. The corpus is positive at 11 rows to 3. We treat an unmeasurable platform as materially worse to buy than a measured one, and we do not read absence of evidence as evidence.

Support, 7.5. A three to one praise ratio and a strong education library, held back by a Capterra service sub-score of 4.4 that is mid-pack rather than leading, and by a free tier limited to basic product support.

Pricing value, 6.0. Two opposite facts. The most generous free tier in the category, and the second highest price-complaint share we have measured. They roughly cancel.

API and MCP, 8.0. A broad v4 REST surface, OAuth with PKCE, and two official MCP servers. Held below 9 by the absence of SMTP, the absence of a transactional endpoint, and unpublished rate limits.

Who should use Kit, and who should not

Third-party validation

The headline scores flatter Kit relative to its sub-scores, and that gap is worth reading. A 4.6 on Capterra puts it at the top of the field alongside MailerLite, Brevo and Omnisend. But its two published sub-scores are both 4.4, which places it below MailerLite at 4.6 and 4.8, below EmailOctopus at 4.7 and 4.8, and below Brevo at 4.6 and 4.5. Kit is the platform in our set with the largest gap between what its headline says and what its components say.

The G2 listing is worth a warning of its own. Searching G2 for Kit returns several unrelated products and at least one stale ConvertKit-era page. The current listing is convertkit-kit. Anyone auditing this independently should confirm the product name on the page before quoting a number, because we have hit exactly this failure mode on other platforms in this series.

Top 3 alternatives

Continue reading

• Kit pricing, the full tier table with what each plan adds
• Kit API, the v4 REST surface, authentication and MCP setup
• Kit integrations
• Kit SMTP settings, and why there are none
• MailerLite review
• ActiveCampaign review

Frequently asked questions

How much does Kit cost?

The free plan runs to 10,000 subscribers with unlimited broadcasts and costs nothing. Creator lists at $33 a month at 1,000 subscribers on the annual view, which is $390 a year; our pricing tab records $39 a month when billed monthly. Pro lists at $66 a month at 1,000 subscribers on the annual view, or $790 a year. Both paid tiers scale with subscriber count.

What is ConvertKit pricing now that it is called Kit?

Same product, same price list. ConvertKit was renamed Kit in 2024 and the pricing page moved with it. If you are on a legacy ConvertKit plan the tier names may not match what is published today, so check what you are actually billed rather than assuming the public table applies.

What does the ConvertKit free plan include?

Up to 10,000 subscribers, unlimited email broadcasts, and unlimited landing pages and forms. It excludes visual automations and email sequences, which are both paid-only, and support is limited to basic product support. In practice you can send newsletters indefinitely for free but you cannot automate them.

ConvertKit vs Mailchimp: which is better?

They solve different problems. Kit is tag-first with no lists, plain-text oriented, and free to 10,000 subscribers with automation locked. Mailchimp is design-first with a much larger template library, a measured 89.8 percent inbox placement against Kit’s untested, and a far smaller free tier. Choose Kit if you write, Mailchimp if you design. The reviewers who switched from Mailchimp to Kit almost all cite the duplicate-contact and list-billing problem as the reason.

What are the best ConvertKit alternatives?

MailerLite at 7.4 for the same philosophy with measured deliverability and better templates, EmailOctopus at 7.1 for the cheapest credible paid tier, and ActiveCampaign at 7.2 if you have outgrown Kit’s automation. All three are reviewed on this site.

Does Kit have an API?

Yes, a v4 REST API covering accounts, broadcasts, custom fields, email templates, forms, posts, purchases, sequences, subscribers, tags, snippets and webhooks. Authentication supports API keys, the OAuth refresh token flow and PKCE. There is no SMTP relay and no documented transactional endpoint, and rate limits are not published in the documentation index.

Is Kit good for a newsletter?

It is the best free option we have tested for one. Ten thousand subscribers and unlimited sends with no card is unmatched in this category, and the tag model handles reader segmentation better than list-based tools. The two things to know before you commit: automation is paid-only, and no independent test of Kit’s inbox placement exists.

Is Kit email marketing worth paying for?

It depends entirely on whether you need automation. If you broadcast, stay free forever. If you need sequences and visual automations, you are paying from $33 a month at 1,000 subscribers, and 28 percent of the review corpus thinks that step is too expensive. At that price point MailerLite and EmailOctopus both deserve a look, and both have deliverability numbers you can read.

Changelog