Why Logarithm

Sooner or later a B2B customer asks: "Can we see who changed what in our account?" Security questionnaires, ISO 27001 and SOC 2 audits ask the same, and so does your own support team when a setting changed and nobody remembers why.

Logarithm is an audit log you run in your own database. You record an event wherever something important happens, and your customers' admins get a ready-made activity view in your app.

• Record in one line. audit.record({ action, actor, targets, before, after }). Logarithm computes the field-level diff and never stores passwords, tokens or card numbers.
• Your database. Stores for Postgres (13+, including Neon and Supabase) and SQLite (better-sqlite3, node:sqlite, Bun). No external service, no data leaves your infrastructure.
• Built for multi-tenant SaaS. Every event belongs to a tenant, and a scoped log cannot read other tenants, even with a crafted query.
• A view your customers can use. <AuditLog> for React shows entries grouped by day, with search, filters, a diff per entry and paging, in English and German.
• Fast queries at any size. Keyset pagination and indexes for tenant, actor, action and target.

When you need more

Logarithm Pro adds what auditors and enterprise customers ask for next: tamper evidence with an HMAC hash chain, retention periods with archiving, GDPR and Swiss FADP erasure and access requests, CSV export and forwarding to Splunk, Datadog or a webhook.

Packages