Quick answer
MojoAuth - MojoAuth wins for most builders because its free tier is easier to start with, needs no credit card, and includes enough auth features for a simple passwordless login flow.
How the free tiers compare
These two free tiers target similar MAU bands, but they optimize for different outcomes. Auth0 is the broader identity platform: it gives you more of the enterprise-style plumbing out of the box, including organizations, SCIM, self-service SSO, and one enterprise connection, but the free plan still asks for credit card verification for custom domains and feels closer to an on-ramp into a larger paid stack. MojoAuth is narrower and more startup-friendly: it is centered on passwordless and common consumer login methods, with hosted pages and unlimited total users, and its free plan explicitly does not require a card. The big practical difference is that Auth0 is better if identity will get complex, while MojoAuth is better if you want to ship a basic login experience quickly and postpone billing friction.
Auth0 vs MojoAuth free tier, side by side
| Auth0FTV 52 | MojoAuthFTV 65 | |
|---|---|---|
| Free MAUsBoth free tiers top out at the same MAU level. | Up to 25,000 | 25,000 included |
| Custom domainsAuth0 explicitly includes one custom domain; MojoAuth input does not list a custom domain quota. | 1 | Not stated |
| OrganizationsAuth0 exposes organization management on the free tier. | 5 | Not stated |
| Enterprise connectionsAuth0 includes one enterprise connection; MojoAuth free tier does not mention this. | 1 | Not stated |
| Unlimited total usersMojoAuth says unlimited total users on the free plan. | Not stated | Included |
| Credit card required for free tierUse only where the input explicitly states it. | Yes, for custom domain verification | No |
After you outgrow the free tier
Auth0 uses flat pricing on its first paid tiers, starting at Essentials for $35/month, then Professional at $240/month, with Enterprise by contact sales. MojoAuth uses a tiered model on its first paid tier, Business Pro at $50/month, with a 5,000 MAU tier and $0.06 per MAU overage, then Enterprise by contact sales. For small teams, Auth0 is cheaper at the first paid step, but MojoAuth can become more expensive as MAU rises because it charges overages above the tier.
Cost at real usage
| Usage | Auth0 | MojoAuth |
|---|---|---|
| 5,000 MAU/moMojoAuth's plan includes a 5,000 MAU tier; Auth0's Essentials plan lists up to 500 MAUs in the provided data, so 5,000 MAU would exceed that tier. | $35/mo | $50/mo |
| 10,000 MAU/moMojoAuth estimate uses $50 base plus 5,000 excess MAUs at $0.06 each. Auth0 would require a higher plan or sales contact; no priced overage is provided. | $35/mo | ~$800/mo est. |
| 25,000 MAU/moMojoAuth estimate uses $50 base plus 20,000 excess MAUs at $0.06 each. Auth0's free tier covers 25,000 MAUs, but the next paid tier in the input is capped at 500 MAUs and no higher priced MAU ladder is provided. | $35/mo | ~$1,250/mo est. |
Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.
When to pick each one
Pick Auth0 when…
- You need SSO, SCIM, or organization management on day one.
- You expect to model multiple customer organizations in the app.
- You want a more established identity stack for eventual enterprise rollout.
- You need Auth0-specific features like enterprise connections or audit log streaming.
- You are okay with credit card verification for some free-tier setup steps.
Pick MojoAuth when…
- You want to launch authentication without entering a credit card.
- Your app mainly needs email OTP, magic links, passkeys, or social login.
- You want hosted login and registration pages with minimal setup.
- You expect a simple consumer app rather than a complex B2B identity setup.
- You want unlimited total users on the free tier and can live with the MAU cap.
Bottom line
For the most common builder use case, MojoAuth is the better free-tier pick because it gets you to a live login flow with less friction and no credit card. Auth0 is the stronger choice if you already know you need organization management, SCIM, SSO, or a more enterprise-shaped identity stack. If your priority is fast setup and a simpler auth surface, MojoAuth wins. If your priority is future complexity and enterprise readiness, Auth0 is the safer starting point.
Read the full listings: Auth0 and MojoAuth. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.