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Feature / Custom attributes

Store every attribute that matters to your product.

Plan, MRR, signup date, feature flags, lifecycle stage, company name, job title, geographic location. No attribute limits, no tier upgrades to unlock, no rigid schemas.

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  • No per-contact attribute limit
  • Strings, numbers, booleans, dates, arrays, JSON
  • Schema-less, add new attributes any time
  • Attribute changes fire segment + workflow re-evaluation
  • Bulk attribute updates via API or CSV
app.segmailer.com/unlimited-custom-attributes
SegMailer contact profile with custom attributes
Example contact: 24 custom attributes spanning plan, usage, billing, and lifecycle.

How it works

A closer look at what makes it tick.

Why schema-less matters for SaaS

Your SaaS product model evolves. One quarter you add a 'trial_extended_count'; next quarter you add 'seats_used'. If your email tool forces a schema migration every time, you'll stop modeling new behaviors. SegMailer doesn't care, send whatever attributes your product produces, they become queryable immediately.

Every attribute is segmentable

Every attribute is a first-class filter in the segment builder. If your app writes 'ltv' as a float, you can segment on ltv > 500. If it writes 'features_used' as an array, you can segment on 'reports' in features_used. No special setup.

Type inference and consistency

First write defines the expected type; subsequent writes must be compatible. This prevents accidentally changing 'plan' from a string to a number and breaking your segments. Type mismatches surface as validation errors in the API response so you catch them in integration, not in production.

Example use cases

Who this is actually for.

Product attributes

plan, mrr, seats_used, feature_flags, last_active, total_sessions.

Lifecycle attributes

lifecycle_stage (free / trial / paid / churned), signup_source, nps_score.

Business attributes

company_size, industry, job_title, role, country.

Engagement attributes

last_campaign_opened_at, total_clicks, preferred_topic.

FAQ

Unlimited Custom Attributes, answered.

  • No hard limit. We've seen contacts with 100+ attributes. In practice, 20–40 attributes covers most SaaS needs. There's no tier upgrade to unlock more slots.

Ready to try unlimited custom attributes?

Free forever up to 500 contacts. No credit card. Set up in minutes.

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