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Brevo, formerly known as Sendinblue, is the clearest fit for a B2C SaaS whose user count is large but whose marketing mail goes out a few times a month. The free plan covers up to 100,000 contacts with 300 daily sends, which is enough to run a newsletter and a short onboarding sequence before you pay anything. Paid plans are priced by monthly email volume. Starter is $9/month and starts at 5,000 emails a month with no daily sending limit. A list of 60,000 contacts that you mail once a month is therefore billed on sends, not on the full list size.

For a consumer product, the strength is the separation between how many people you store and how much you send. Free users who sign up and rarely engage can stay on the list without raising your bill the way they would on a per-contact platform. Brevo also puts marketing automation and transactional sending in one account, which can simplify early operations for a team that does not yet need separate sending infrastructure.

The limitations are specific. The free plan has a daily cap, so a launch day can hit it and delay messages. Automation and A/B testing, which lifecycle programs depend on, start on Standard at $18/month, not on Starter. If your messages depend on detailed product events, check how Brevo receives and filters those events before you commit, because its strength is volume pricing rather than event modeling. Teams that send to very large lists every week should also compare the Professional plan, which covers 150,000 to 10 million sends and up to 2 million contacts, against the other options in this guide.

Brevo is the right first pick for a B2C SaaS that wants one account for newsletters, onboarding and basic transactional mail, and that expects its list to grow faster than its send frequency. If product events are the main trigger for your messages, you may outgrow it sooner than the starting price suggests.

Klaviyo is built around profiles: one record for each person that combines their attributes, their events, and their email and SMS history. For a B2C SaaS that tracks product events such as feature use, plan changes, or a first export, Klaviyo gives you a place to store those events on the person and build flows that react to them. That fits well when your onboarding and retention messages depend on what a user has done rather than on the date they signed up.

The Email plan is priced per active profile. The published monthly prices are $20 for 500 profiles, $30 for 1,000, $60 for 2,500, $100 for 5,000, $150 for 10,000, and $400 for 25,000. The free plan covers 250 active profiles and 500 email sends a month, plus $5 of mobile messages. Email+SMS plans are listed on the pricing page without a published price in the record, so budget for SMS separately and request a quote if you plan to use it.

The limitation is cost growth. A consumer product with a large free tier can add active profiles faster than paid users, and the bill follows the profile count. Check how your product defines an active profile before you commit, because that definition drives the price. Klaviyo also rewards careful event naming. Poorly named events make segments hard to maintain, and a segment that nobody understands becomes a segment nobody updates.

Klaviyo suits a SaaS whose lifecycle messages depend on rich profile data and that can afford a per-profile price at its current size. For a free-heavy product with a small paid base, the profile count will decide whether the platform stays affordable.

Customer.io is the most direct fit for a consumer SaaS whose messages should follow product events closely. A trial starts, a user invites a teammate, a feature is used for the first time, or a payment fails: each of these can start a message within minutes of the event. The visual workflow builder lets a product marketer write branching logic around those events without adding a new code path for every campaign.

The published pricing has three layers. Essentials starts at $100/month and includes the visual workflow builder, email and community support, and basic data integrations. The Essentials profile tiers are $145/month at 10,000 profiles, $235 at 20,000, $325 at 30,000, $415 at 40,000, and $505 and up at 50,000 profiles, all billed monthly. Premium, which has custom profile volume and elevated AI Agent limits, is listed at $1,000/month. Eligible early-stage companies that have raised under $10 million can receive 12 months free through the Startup Program.

Customer.io needs engineering time. Events must be sent from your product with clear names and attributes, and someone has to own that schema over time. Teams that already log product events to a warehouse will find the setup easier. Teams without a developer may spend the first month on tracking rather than on messages. The investment pays off once the events exist, but it is real work, and it should be scheduled before you sign.

It is a good fit for a SaaS where the product itself produces the triggers, and where trial, activation and payment-recovery messages are central to retention. It is harder to justify for a team that only needs a newsletter and a welcome email, because the price and setup effort are sized for behavioral programs.

Drip prices by the number of people on the list and includes unlimited email sends on its listed tiers. For a consumer SaaS with a few thousand users who receive frequent lifecycle mail, that makes the monthly cost easy to forecast. The published tiers include $39/month for 1 to 2,500 people, $49 for 2,501 to 3,000, $89 for 4,501 to 5,000, $154 for 9,001 to 10,000, and $369 for 22,501 to 25,000. A 14-day free trial needs no credit card, and there is no ongoing free plan.

The workflow builder is visual and supports tags, custom fields and event-based segments. The listed tiers include up to 50 workflows, which is enough for an onboarding series, a re-engagement path and a payment-recovery sequence. A large product with many distinct segments may reach that cap, so count your planned workflows before you choose a tier.

Drip is a reasonable choice when a team wants unlimited sends at a clear monthly figure and does not want to model the cost of each message. Its limits are the lack of a free plan and the workflow cap for larger programs. Its origins in commerce mean that many examples and templates lean toward purchase-based flows, so a subscription product will need to adapt them to trials, plan changes and renewals.

Mailchimp is a common first choice for teams new to email. Its interface is familiar, its free plan allows up to 250 contacts and 500 sends a month, and the Standard plan starts at $20/month for 500 contacts. A 14-day Standard trial is available. For a small consumer product whose immediate need is a first newsletter and a simple welcome message, that is a low-friction start.

Pricing is contact-based and steps up in tiers. The published figures include $100/month for 2,501 to 5,000 contacts with up to 60,000 emails, $135/month for 5,001 to 10,000 contacts with up to 120,000 emails, and $230/month for 10,001 to 15,000 contacts with up to 180,000 emails. Several counts between those tiers do not have a published price in the record, so ask the vendor for a quote if your list falls in one of those gaps.

The limitation for a growing SaaS is that contact-based pricing rises with the size of the list, including free users who rarely open. Automation depth is adequate for basic onboarding and re-engagement, but teams that need event-driven triggers from the product will usually outgrow it. Mailchimp fits a B2C SaaS in its first year, when simplicity matters more than automation and the list is still small enough for the lower tiers.

ActiveCampaign combines email, automation and a basic CRM. For a consumer SaaS that wants sales-style follow-up for higher-value users, such as a team plan that needs a conversation before upgrading, the CRM can hold that context next to the email history. The automation builder supports branching, wait conditions and split tests inside a workflow, which makes it one of the more capable options at its entry price.

The published prices are Starter at $15/month, Plus at $49, Pro at $79 and Enterprise at $145, each starting at 1,000 email contacts. Starter includes email marketing, marketing automation, standard CRM and ecommerce integrations. Plus adds standard segmentation and landing pages, and Pro adds advanced segmentation. Prices above the 1,000-contact starting point are not published in the record, so a list of 2,500 or more needs a quote.

The limitation is that a consumer product with a large free tier will pay for contacts that never convert, and the published starting price stops at 1,000. A free trial lets you test the workflow builder before committing, which is worth doing with a real event feed rather than a sample list.

ActiveCampaign suits a SaaS that has a meaningful paid tier to nurture and a team comfortable with a more complex tool. For a free-heavy product that only needs a newsletter, it is more platform than the job requires.

Omnisend was built for shop-style businesses, which makes it a useful reference for a consumer SaaS that sells add-ons, digital goods or subscription boxes alongside software. It ships prebuilt flows for welcome, abandonment and win-back messages, and it supports SMS and web push alongside email. Teams that want to launch with proven flows and adapt them afterward will find this faster than building from a blank canvas.

The free plan covers 250 contacts and 500 emails a month, plus 500 web push notifications. Standard is listed at $11.20/month for 500 contacts and 6,000 emails, shown at the introductory rate for the first three months of a 30 percent discount offer. Pro is $41.30/month for 2,500 contacts with unlimited emails and SMS from $0.007 per SMS, with SMS pricing varying by country and volume.

The main limitation for a pure SaaS product is that the platform is oriented toward store data. Your product events will need to be mapped into a commerce-style model, and some prebuilt flows will not match a subscription lifecycle without editing. Check how trial starts, upgrades and cancellations reach the platform before you rely on the templates. Omnisend is a sensible option when SMS and push are part of your plan and the list is small enough for the Pro tier to be affordable.

Kit, formerly ConvertKit, is a strong fit for a B2C SaaS that runs a newsletter or tips series for a large, mostly free audience. The free plan covers up to 10,000 subscribers with unlimited landing pages, forms and email broadcasts, plus tagging and segmentation. For a product whose main email is a regular update rather than a set of triggered messages, the free tier can carry the program for a long time.

Automation is where the price changes. Visual Automations and email sequences start on the Creator plan at $33/month billed annually. The Pro plan is $66/month billed annually and adds subscriber signals, unlimited users, deliverability reporting and a newsletter referral system. A 14-day free trial is available on paid plans without a credit card.

Kit does not have the event-driven depth of Customer.io or Klaviyo. A SaaS that needs payment-failure or activation triggers will need to send those events in from its own stack or through an integration layer. It is best understood as a newsletter tool with light automation that can grow into a larger program when the audience justifies it.

Loops is built for SaaS teams that want marketing and transactional mail in one place. Its Growing Audience plan, at $99/month, includes unlimited sends to subscribers and transactional sends to users outside your audience. That second part matters for a consumer product that sends receipts, access emails and account notices to people who have not opted into marketing, because those messages are often the ones users care about most.

The free Early Stage plan includes unlimited contacts, but it allows up to 4,000 sends in any rolling 30 days, and only to the 1,000 newest contacts. It adds a Loops footer and sends at up to 10 emails per second. It is a practical place to build and test a product email program before you pay, as long as your early list and send volume stay inside those limits.

The pricing record for the $99 plan does not state the contact tier it covers, so confirm the contact limit with the vendor before you budget for a large list. Teams that need deep event-based branching may find the automation simpler than Customer.io's, which is a trade-off for a team that wants to keep things modest.

Iterable is designed for larger consumer businesses that coordinate email, SMS, push, in-app and web push messages from one system. For a B2C SaaS with a mobile app and a large user base, the value lies in a single orchestration layer across channels, and in the optimization features that choose timing and channel for each user.

Pricing is on request. The pricing page does not list a free plan and directs buyers to a demo. Budget for a sales conversation and a quote built around your profile count and channel mix, and do not assume that a figure from another vendor's table will apply here.

The limitation is fit. A team with a small list, a single channel and no engineering support will pay for capability it does not use. Implementation also takes time, so the decision should follow a clear plan for multi-channel messaging rather than a wish to be ready for it.