Add new spreadsheet contacts to MailerLite without duplicates

Checks a spreadsheet of contacts against MailerLite and adds only the new ones, so your email list stays duplicate-free.

How the work actually flows

It branches. Exactly one path is taken; runs once per each spreadsheet row.

Pattern: Exclusive Choice (4) · Multiple Instances with a priori Design-Time Knowledge (13)

flowchart TD trig[\"spreadsheet has contacts to sync"\]:::trigdata s0[["read each spreadsheet row"]]:::mi s1["check against MailerLite list"]:::task trig --> s0 s0 --> s1 gx{"× already subscribed"}:::gate s1 --> gx p00["skip contact"]:::task gx -->|"already subscribed"| p00 p10["create subscriber"]:::task gx -->|"new contact"| p10 p00 --> out p10 --> out out[/"MailerLite list updated without duplicates"/]:::out pay{{"no duplicate contacts, less manual work"}}:::pay out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff
Starts itA stepRuns once per itemOne path onlyResultPayoff
Build size
Standard

A mid-size build with several tools working together.

Business functions
Spreadsheet & Database Ops
Connects
Google SheetsMailerLite

The problem it solves

You're keeping subscriber information in a spreadsheet but manually copying new names into MailerLite, checking each one to make sure they're not already there. It's slow, and it's easy to accidentally create duplicate contacts or miss someone entirely.

Who it fits

Small business owners and email marketers who manage their subscriber list in a spreadsheet.

How it works

  1. Reads every row in your subscriber spreadsheet
  2. Checks each email address against your MailerLite list
  3. Skips anyone who's already subscribed
  4. Creates a new subscriber with their name, company, and group
What you get

Subscribers added without ever duplicating

Your MailerLite list grows from your spreadsheet automatically, with every contact added once and never duplicated.

What you get

An up-to-date MailerLite subscriber list with no duplicate contacts.

What you need

A Google account and a MailerLite account with API access.

We can build this. But should you?

The hard question is not how to build it. It is whether this is the right thing to build first.

That is what a Fractional Chief AI Officer figures out with you, before anyone writes a line of code.

Let's Talk Strategy

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