Better Auth vs AfterTax AU

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Better Auth compared with AfterTax AU
Detail	Better Auth	AfterTax AU
What it does	The most comprehensive authentication framework	Free Australian tax API and MCP server for AI agents
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	AU
Pricing model	Freemium	Open source
Pricing	Framework is free and open source. Managed infrastructure: Starter $0/month, Pro $20/month, Enterprise custom. Pro plan includes $0.001 per email and $0.09 per SMS for transactional communications. Self-service SSO and Directory Sync start at $50/month per connection. Custom domain for Dashboard and	Not given
Key features	Works with Next.js, Nuxt, SvelteKit, Astro, Hono, and 20+ more frameworks Built-in credential authentication with sessions, email verification, and password reset Social sign-on with 34+ providers including Google, GitHub, Apple, Discord Multi-tenancy with teams, roles, invitations, and access control Enterprise features: SSO, SAML 2.0, SCIM, directory sync 50+ authentication methods including passkeys, magic links, API keys, JWTs Auth for AI agents with MCP auth, token exchange, and agent delegation Security features: bot detection, IP blocking, email validation User management dashboard with session monitoring and organization oversight	Take-home pay calculator for Australian salaries and hourly rates PAYG withholding calculation using ATO Schedule 1 formulas Bonus and commission withholding calculation Annual tax estimate with offsets and Medicare levy Superannuation guarantee calculation at 12% ABN, ACN and TFN validation using check-digit algorithms MCP server integration for Claude, ChatGPT and Cursor JSON API accessible without sign-up or API key Open-source JavaScript npm library with no dependencies Tax rates and thresholds for 2025–26, 2026–27 and 2027–28
What makes it different	Declarative configuration as code instead of dashboard clicks, version controlled and reviewable in PRs Bring your own database instead of being locked into a specific provider 50+ authentication methods and growing with plugin ecosystem Real-time threat detection before it reaches users with Sentinel Built by community of 987+ contributors	Uses ATO's own published formulas, not model memory Tested against all 432 ATO sample rows for each tax year No sign-up, API key or authentication required Open-source code available on GitHub Free for reasonable use with no storage of amounts entered
Community votes	0	0
DR (Domain Rating by Ahrefs)	77 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	24	0
Citation Flow (Majestic)	44	0
Referring domains (Majestic)	2738	0

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