MailerLite vs Mailchimp for a five-email welcome flow

Quick answer: A five-message welcome series with four delays needs nine actions after its entry trigger. MailerLite Comfort has documented room for that single-trigger flow and a customer condition, subject to the chosen subscriber tier and send allowance. Mailchimp Essentials falls short of nine steps under both current help-page limits; Standard is the relevant tier and is also required for a conditional split. Verify each live plan and run test contacts through the paths before activating the series. Sources: MailerLite automation, Mailchimp flows.

Important constraint: Automation steps, active automations, audience size, and monthly sends are four different limits. The modeled workload is 6,500 sends per month before tests, resends, other workflows, or growth. A plan can fit the nine-step editor and still exceed its selected audience or sending allowance. Sources: MailerLite billing, Mailchimp plans.

Take a small B2B software newsletter with 2,500 active, marketable contacts, two full-list broadcasts each month, and 300 newly eligible subscribers entering a welcome series. The five messages and their cadence have already been approved; this choice is about representing that flow in the tool and paying for the right capacity. An optional check after message three identifies a current customer and sends that person away from the remaining promotional path.

The product limits below come from current vendor documentation checked October 3, 2026. No plan price or deliverability ranking follows from them. The exact contact tier, billing period, renewal, tax, and over-limit behavior need a live quote for the account. The series itself should be tested with controlled contacts before any real audience is allowed to enter.

Count the workflow once, then map it to each builder

Write the approved path as a sequence of actions:

eligible signup → W1 → D1 → W2 → D2 → W3 → customer condition → exit or D3 → W4 → D4 → W5

Here W1 through W5 are five send-email actions, and D1 through D4 are four delay actions. The single signup or eligibility trigger starts the flow; it is not one of those nine post-trigger actions. The linear path therefore has nine steps. Adding the optional customer condition after W3 brings the design to at least ten steps, with any extra branch actions counted separately. The condition can lower actual promotional sends, but the budget below assumes every entrant reaches W5 so the capacity check is conservative for this fixed design.

MailerLite’s workflow guide documents a trigger plus email, delay, and condition steps. Its step guide describes conditions evaluated when a contact reaches them. A customer group or field therefore needs to be updated by the business’s actual process before the contact reaches the check. A condition block cannot infer a purchase that no integration or operator recorded.

Mailchimp’s flow builder documents signup triggers and email and delay actions; its conditional split rules require Standard or higher. The optional branch is not merely a filter on the first email. A person who becomes a customer after W3 should take the intended branch when the condition runs, so the later test must include a mid-flow conversion, not only a contact marked customer before entry.

Resolve the step and trigger gates first

MailerLite’s current automation page lists up to 100 steps per automation and 50 active automations for Comfort. One nine- or ten-step flow fits those documented ceilings. Its multiple-trigger help places multiple triggers on Power; this workload uses only one, so that feature alone does not justify moving to Power. If a later redesign needs several independent entry events, re-evaluate the plan rather than quietly adding them to the current selection.

Mailchimp’s current help is inconsistent on one number: the main flow page says Essentials allows up to four steps, while the Classic-to-Flow conversion FAQ says three. Neither permits this nine-step core sequence, so the disagreement does not change the decision. The same pages put Standard at up to 200 steps. Confirm the live account’s actual limit before building, and do not describe the Essentials cap as settled at one of the conflicting numbers.

This is a structural fit, not a recommendation that one sender will deliver more messages to inboxes. Contact permission and hygiene, domain authentication, sender reputation, content, and receiving systems all influence delivery. The platform choice here begins with a simpler question: can the selected tier express the approved logic and hold the volume?

Budget sends and audience units separately

The two full-list newsletters produce 2 × 2,500 = 5,000 sends. The welcome series adds at most 300 entrants × five emails = 1,500 under the model. Total: 6,500 monthly sends. This assumes both broadcasts reach 2,500 recipients and all 300 entrants receive W1–W5. It excludes test messages, resends, transactional email, other automations, and any audience growth. The customer branch may lower actual sends, but do not buy a tier that only works if an unverified number of people exit early.

At the selected tier, record the audience/contact ceiling and monthly send allowance next to that 6,500 subtotal. MailerLite’s current billing help counts active subscribers and sent campaign and automation emails; its Comfort materials express sends as ten times the subscriber basis or selected tier under current terms. Paid accounts can be automatically moved to a higher tier when contact or sending limits are crossed. Check which threshold applies to the actual 2,500-subscriber account and what a growth month would do to the invoice. Deleting and reimporting contacts during a billing period is not a sound capacity strategy.

Mailchimp’s plan help gives a monthly send limit of ten times the selected contact limit on Essentials and twelve times on Standard. Standard is the relevant plan for this flow, but “2,500 people” is not automatically the exact purchased contact tier or billable stored-contact count. Obtain the account’s current contact limit, send limit, and pricing basis. The 6,500 modeled sends may be below a plan’s multiplier while the chosen audience tier or stored-contact rules still matter.

Give the forecast its own buffer. If tests and resends add 200 messages and a campaign grows to 2,700 recipients, recalculate from the changed inputs; do not tack an unexplained percentage onto the plan price. A simple capacity sheet can keep current active contacts, selected tier ceiling, two campaign audiences, welcome entrants, messages per entrant, other workflows, tests, and the plan’s reset date in separate rows. This makes an automatic upgrade or over-limit pause an operational event the team can anticipate.

The optional customer branch can be modeled without pretending to know its future conversion rate. If 60 of the 300 entrants were already customers when they reached the condition after W3, and each skipped W4 and W5, the welcome portion would fall by 60 × 2 = 120 sends, from 1,500 to 1,380. The combined subtotal would be 6,380 before extras. This is a sensitivity example only. The purchase check should still use the 6,500 upper-bound path unless the team has reliable evidence and intentionally budgets around a lower count. Even then, a late or missing customer tag can send people down the longer path.

Run a five-contact sandbox before activation

Use test addresses whose status and expected route are known. The purpose is to verify entry, delay timing, condition evaluation, suppression, and re-entry behavior in the actual configured account. A successful editor preview is not evidence that the live trigger and audience rules are right.

For each test, record plan, flow version, trigger configuration, contact state, observed entry and send times, branch taken, unsubscribe state, and any mismatch. A platform may have settings for whether existing subscribers enter when a workflow is activated or whether a repeated event permits re-entry. Check those in the current builder rather than assuming the new-subscriber forecast includes a backfill. If the first test reveals that all 2,500 existing contacts would enter, pause and correct the trigger before launch; the send budget and recipient expectation would both change.

Make the test exits as visible as the sends. A contact that stops after W3 should have a recorded branch decision, not merely an absence of W4 in an inbox. Check whether the condition read the current field or group value at the expected time. For the unsubscribe case, inspect the platform’s suppression state before the next scheduled action. These observations help distinguish a timing issue from a wrong audience rule and prevent an apparently successful test from masking a later unwanted message.

Do not send the optional W4 and W5 promotions to someone whose customer flag should have routed them away. Conversely, if the customer signal arrives late from a sales system, the email platform cannot act on information it has not received. Verify the signal’s source and update timing with the same care as the visual branch. The sequence-planning guide can help with message purpose; this plan choice is about whether the approved logic actually runs as specified.

Choose the smallest plan that passes the fixed design

MailerLite Comfort is the narrower documented fit for this one-trigger, nine-step flow if its subscriber accounting, current send allowance, automatic paid-tier changes, and test results suit the team. MailerLite Power becomes relevant if the approved flow later needs multiple triggers or a different entitlement, not merely because it is the higher tier. Mailchimp Standard is needed for the core step count and conditional split; Essentials cannot encode this design under either published step cap.

Before buying, record the live market, currency, billing term, contact/subscriber tier, included sends, over-limit behavior, tax, renewal, and exact automation limits. Then run the five-contact sandbox. A plan that looks sufficient on paper but sends W4 to an existing customer, re-enters the same subscriber unexpectedly, or pauses at a limit has not passed the business workflow. The sound choice is the one whose configured behavior matches the approved series and whose current allowance holds the monthly ledger with room for the team’s actual extras.