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Free Customers.ai alternatives: 2 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

2 of the 5 Customers.ai alternatives we track can be used for free (free, open source, or with a free plan). Apollo.io and Klaviyo rank highest, with facts last verified Nov 8, 2026.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Apollo.io logoApollo.ioFree plan + paid—NoWeb, Browser extension4 of 469.4
2Klaviyo logoKlaviyoFree plan + paid$20 a month (email, based on active profiles)NoWeb, iOS, Android4 of 456.2
  1. Apollo.io logo

    1. Apollo.ioTop pick

    Best for: Startups and small sales teams that want contact data and outreach sequencing in one affordable tool

    Free plan + paidWeb, Browser extension

    69.4

    score / 100

    Why switch from Customers.ai

    Contact database and sequencing tool that also tracks website visitors, so identification and outreach share one platform.

    Pros

    • Free plan with no time limit for light prospecting
    • Data, email sequences and dialer in one product
    • Chrome extension reveals contacts while browsing
    • Syncs with Salesforce, HubSpot and other common tools

    Cons

    • Credit system: unused credits expire each billing cycle
    • Free plan can only connect Gmail inboxes
    • API access is limited to custom plans
    Visit Apollo.io Details and reviews
    How this score is calculated
    Editorial fit ×0.352
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Apollo.io a good Customers.ai alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Yes, no time limit
    Checked Nov 8, 2026apollo.io(opens source in a new tab)
    Database
    240M+ contacts, 30M+ accounts
    Checked Nov 8, 2026apollo.io(opens source in a new tab)
    Integrations
    Salesforce, HubSpot, Outreach and more
    Checked Nov 8, 2026apollo.io(opens source in a new tab)
    Credit rollover
    No
    Checked Nov 8, 2026apollo.io(opens source in a new tab)
  2. Klaviyo logo

    2. Klaviyo

    Best for: Ecommerce brands that want automation driven by purchase and browsing data

    Free plan + paidWeb, iOS, Android

    56.2

    score / 100

    Why switch from Customers.ai

    Its own sign-up forms and segmentation may be enough if you don't need visitor identification.

    Pros

    • Deep ecommerce data, segmentation and predictive metrics
    • Strong pre-built flows for carts, browsing and win-back
    • Revenue reporting per campaign and flow

    Cons

    • Expensive for large lists
    • Overkill for non-ecommerce businesses
    • Steep learning curve
    Visit Klaviyo Details and reviews
    How this score is calculated
    Editorial fit ×0.341
    Reviews ×0.363
    Clicks (90 days) ×0.1533
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Klaviyo a good Customers.ai alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Yes, up to 250 profiles and 500 emails/month
    Checked Nov 3, 2026klaviyo.com(opens source in a new tab)
    Free plan channels
    Email, SMS, Customer Hub, reporting
    Checked Oct 29, 2026klaviyo.com(opens source in a new tab)
    Free plan mobile messaging
    $5 of mobile messages per month
    Checked Nov 3, 2026klaviyo.com(opens source in a new tab)
    Starting price
    $20 a month (email, based on active profiles)
    Checked Nov 8, 2026klaviyo.com(opens source in a new tab)