8 Best Email Tools With Segmentation (2026), Tested
Tools for building durable SaaS segments from product behavior, profile data, account state, and messaging history.
criteria
- Real-time behavioral segments
- Account and user attributes
- Segment reuse across journeys and broadcasts
- Exclusion and suppression logic
- Clarity when segment membership changes
- 01
Customer.io
Marketing TransactionalPowerful data-driven segments and journey logic for teams that can support the required data model.
- 02
Loops
Marketing TransactionalSaaS-oriented audiences combine contact properties and product events without a large implementation burden.
- 03
Klaviyo
MarketingExceptionally deep segmentation for commerce behavior, profiles, and purchase history.
- 04
Userlist
MarketingCompany-aware segmentation is a real advantage for B2B products with account-level lifecycle states.
- 05
ActiveCampaign
MarketingBroad contact, CRM, and automation segmentation, balanced against a more complex interface.
- 06
Encharge
MarketingAccessible behavioral segmentation and flow branching for product-led growth teams.
- 07
Brevo
Transactional MarketingGood value for contact and engagement segments, with less depth for complex product event models.
- 08
Mailchimp / Mandrill
Marketing TransactionalMature audience filters and broad integrations, but weaker alignment with real-time SaaS product behavior.
All 8 compared
Every provider in this ranking against the priorities SaaS product teams weigh. Free tier and entry price sit with each pick above.
| Provider | Multi-tenant | Event stream | Suppressions API | Operating since | Scheduling | Best published rate per 1,000 | Webhooks |
|---|---|---|---|---|---|---|---|
| Customer.io | Yes | Yes | Yes | 2012 | Yes | Tiers not published in comparable form | Yes |
| Loops | No | Yes | Yes | 2022 | Yes | Tiers not published in comparable form | Yes |
| Klaviyo | No | Yes | Yes | 2012 | Yes | Tiers not published in comparable form | Yes |
| Userlist | No | Yes | Yes | 2017 | Yes | Tiers not published in comparable form | Yes |
| ActiveCampaign | Yes | Yes | Yes | 2003 | Yes | Tiers not published in comparable form | Yes |
| Encharge | No | Yes | Yes | Not published | Yes | Tiers not published in comparable form | Yes |
| Brevo | No | Yes | Yes | 2012 | Yes | Tiers not published in comparable form | Yes |
| Mailchimp / Mandrill | No | Yes | Yes | Not published | Yes | Tiers not published in comparable form | Yes |
If you are SaaS product teams
A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.
The order above is the general editorial ranking. Re-sorted against multi-tenant support, event stream, and the suppressions API, the shortlist for trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail becomes Customer.io, ActiveCampaign, and Loops. That differs from the headline order, which weighs all audiences together.