AuthPro is still a real option for simple password protection, but MemberSpace is the closest direct replacement for most small membership sites, adding subscription billing, member spaces and courses. AuthPro publishes no price on its own site, and its signup page lists a Free account and a Deluxe account with no price shown. Clerk counts monthly retained users, not monthly active users, so a new sign-up who never returns does not count against the 50,000 Hobby limit.
AuthPro puts a login form in front of pages on a site you already own, with no code to install on your own server. The alternatives split into two groups. MemberSpace and Memberful do the same membership job with billing built in. The rest are developer identity platforms for apps, and they fit only if you are building an app rather than gating pages on a finished site.
On this page
Authpro alternatives: comparison table
Swipe the table sideways on a phone to see every column.
| # | Name | Best for | Starting price | Free plan / trial | Link |
|---|---|---|---|---|---|
| 1 | AuthPro | Simple password protection on an existing site | quote only | Yes | Visit |
| 2 | MemberSpace | Membership sites on Squarespace or WordPress | $39 per month | No | Visit |
| 3 | Memberful | Creators selling memberships and newsletters | $49 per month | Free trial | Visit |
| 4 | Auth0 | Apps that need enterprise login and SSO | $35 per month | Yes | Visit |
| 5 | Clerk | Modern web apps with ready-made login screens | $20 per month | Yes | Visit |
| 6 | WorkOS | B2B apps that need enterprise SSO | $0 for up to 1,000,000 MAU | Yes | Visit |
| 7 | Firebase Authentication | Google-based apps with email and social login | $0 for up to 50,000 MAU, then usage rates… | Yes | Visit |
| 8 | Supabase Auth | Apps that already use Supabase for data | $25 per month | Yes | Visit |
The 8 best authpro alternatives, in detail
AuthPro
Best for: Simple password protection on an existing site
AuthPro is a hosted service that protects pages with login, registration and password reminder forms you paste into your site. You install nothing on your own server, and the management tool lets you change settings, manage members and check member activity. It supports a custom login form, a registration form, free and subscription membership types, editable member profiles and a lost password reminder.
- AuthPro is narrow.
- It protects pages and manages members, but it does not collect member payments or provide the app login features that developer platforms offer.
- Its signup page lists a Free account and a Deluxe account with no price shown, so confirm the current price with the vendor before you commit.
- Choose AuthPro for the lightest way to gate pages on a site that already works, and choose something else if you need to charge members.
Pros
- No code to install on your own server
- supports free and subscription membership types and editable member profiles
Cons
- No price is published on its own site
- no subscription billing is built in
MemberSpace
Best for: Membership sites on Squarespace or WordPress
MemberSpace adds memberships, a community forum and courses to a website you already have, without moving your content. Starter costs $39 per month billed annually and takes a 5% fee on every sale, with 5 member spaces, unlimited members and tiers, and one website connection. Growth costs $99 per month billed annually, takes a 2% fee, and adds unlimited spaces, three website connections and Admin API access.
- The fee is the number to watch.
- A site earning $1,000 a month pays $50 in MemberSpace fees on Starter, plus Stripe processing, on top of the $39 monthly fee.
- Growth pays for itself once member revenue is high enough for the lower 2% fee to save more than the $60 jump in the monthly fee.
- Choose MemberSpace for a membership layer with courses and community on an existing site, and skip it if you only need a password on a few pages.
Pros
- Unlimited members and tiers on every plan
- installs on one website on Starter and three on Growth
Cons
- Starter takes a 5% fee on every sale on top of Stripe processing
- no free plan is shown on the pricing page
Memberful
Best for: Creators selling memberships and newsletters
Memberful sells memberships for content, services, a podcast or newsletter access, and it works alongside a site built on WordPress or another platform. Standard costs $49 per month plus a 4.9% transaction fee, and you can try it for free until you go live and start accepting payments. The plan includes Apple Pay and Google Pay, coupons, custom fields, gift purchases, group plans, one-time payments and a referral program.
- A creator earning $2,000 a month pays $49 plus $98 in Memberful fees, before Stripe processing, so the fee line grows with revenue rather than staying
- Memberful fits creators who want a proven membership checkout for newsletters, podcasts, courses and downloads.
- It fits less well for a site that only needs login forms and has no member payments.
Pros
- Try it for free until you go live and start accepting payments
- includes coupons, group plans, gift purchases and a landing page builder
Cons
- A 4.9% transaction fee applies on every member payment on top of the monthly fee
- Enterprise pricing is custom
Auth0
Best for: Apps that need enterprise login and SSO
Auth0 is a hosted identity platform for apps, with separate pricing for consumer and business apps. The Free plan costs $0 per month, needs no credit card, and covers up to 25,000 monthly active users with 1 custom domain, passwordless authentication, unlimited social connections, 5 organizations, brand customization, basic attack protection, 1 enterprise connection, self-service SSO and SCIM. B2C Essentials starts at $35 per month for up to 500 monthly active users, and B2C Professional starts at $240 per month for the same user count.
- The limit that forces an upgrade is usually a feature, not the user count.
- The Free plan has 1 day of log retention and no Pro multi-factor authentication, while Essentials adds Pro multi-factor authentication, role-based acc
- Auth0 fits an app that will sell to business customers who ask for enterprise login.
- It is far more than a page gate, so it is the wrong pick for a simple content site.
Pros
- Free plan covers up to 25,000 monthly active users with 1 enterprise connection
- passwordless login and unlimited social connections included
Cons
- Pro multi-factor authentication is not on the Free plan
- B2B Essentials starts at $150 per month
Clerk
Best for: Modern web apps with ready-made login screens
Clerk provides hosted sign-up, sign-in and user management with prebuilt screens, so a team does not build login forms from scratch. The Hobby plan is free, needs no credit card, and covers up to 50,000 monthly retained users per app, with up to 3 dashboard seats, unlimited applications and a custom domain. The Pro plan costs $20 per month billed annually, or $25 per month billed monthly, and includes 50,000 monthly retained users per app, with each user above that costing $0.02 per month.
- Clerk counts a monthly retained user only when a user returns 24 hours or more after signing up, which is a narrower count than the monthly active use
- Pro also adds multi-factor authentication, removal of Clerk branding and custom session lifetimes, while Business costs $250 per month billed annually
- Choose Clerk for a modern web app that needs polished login screens fast.
Pros
- Hobby plan is free for up to 50,000 monthly retained users per app
- Pro includes multi-factor authentication and removes Clerk branding
Cons
- Users above 50,000 cost $0.02 each per month on Pro
- extra enterprise SSO connections cost $75 per month each
WorkOS
Best for: B2B apps that need enterprise SSO
WorkOS sells enterprise building blocks for B2B apps, and its AuthKit user management product is free for the first 1,000,000 monthly active users, then $2,500 per month for each additional 1,000,000 users. That allowance is far larger than the 25,000 on Auth0 or the 50,000 on Clerk, Firebase Authentication and Supabase Auth. The parts that cost money are the enterprise features: SSO and directory sync cost $125 per connection per month, Admin Portal is $100 per month and audit logs are $100 per month.
- The pricing model fits a B2B app that onboards companies one at a time, because each enterprise customer usually needs its own SSO connection.
- A B2B app with 10 enterprise customers pays $1,250 a month for SSO alone.
- Choose WorkOS if enterprise login is the feature your buyers will ask for first, and skip it if you need membership billing.
Pros
- AuthKit user management is free for up to 1,000,000 monthly active users
- includes social login, magic codes, multi-factor authentication and passkeys
Cons
- Each SSO or directory sync connection costs $125 per month
- a custom domain costs $99 per month
Firebase Authentication
Best for: Google-based apps with email and social login
Firebase Authentication is the login layer inside Google Firebase, and its pricing page lists authentication as no cost up to 50,000 monthly active users on both the Spark no-cost plan and the Blaze pay-as-you-go plan. Past that point, Google Cloud pricing applies, with SAML and OIDC sign-in free up to 50 users and then charged per user. Phone authentication is billed per SMS sent, so a phone-first app pays a separate usage charge for every code it sends.
- The free allowance covers email, social and anonymous sign-in, while the enterprise and phone features sit behind an upgrade to Identity Platform and
- A small app with email login stays free to 50,000 users, but an app that needs SAML login or SMS codes starts paying on those meters.
- Choose Firebase Authentication if your app already runs on Firebase or Google Cloud.
Pros
- Email, social and anonymous sign-in are free up to 50,000 monthly active users
- sits inside the wider Firebase platform
Cons
- Phone sign-in is billed per SMS sent and needs the Blaze pay-as-you-go plan
- SAML and OIDC users cost $0.015 per MAU after the first 50
Supabase Auth
Best for: Apps that already use Supabase for data
Supabase Auth is bundled into the Supabase platform, so the same plan that covers login also covers the Postgres database, storage and APIs. The Free plan costs $0 per month and includes 50,000 monthly active users, a 500 MB database, 5 GB of egress and 1 GB of file storage, with a limit of 2 active projects and pausing after 1 week idle. Pro costs $25 per month, includes 100,000 monthly active users and then charges $0.00325 per MAU, with 8 GB of disk per project, 250 GB of egress, 100 GB of file storage and daily backups stored for 7 days.
- Supabase Auth looks cheap at 100,000 users, where Pro still costs $25 a month with the full 100,000 allowance included.
- The limit to plan around is the free project pause, which pushes a live app to Pro even when the user count is small, and the SAML SSO meter, which in
- Choose Supabase Auth if your app already stores data in Supabase.
Pros
- Free plan covers 50,000 monthly active users with a 500 MB database
- Pro includes 100,000 MAU, 8 GB disk and daily backups
Cons
- Free projects pause after 1 week of inactivity and are limited to 2 active projects
- SAML SSO is a separate meter on higher plans
How we chose
We included AuthPro because it is still a live service, then added the two closest membership tools, MemberSpace and Memberful, and the developer identity platforms most often compared with it. Every price and free limit above comes from an official vendor pricing page or official site page opened on 2026-11-12. Where a vendor published no price, as with AuthPro, we wrote quote only rather than copying a price from a review site. We did not test any tool hands-on, and we did not install or run any of these services.
Which option fits your site
| Situation | Pick | Why it fits, with numbers |
|---|---|---|
| Gate pages on a site you already own | AuthPro or MemberSpace Starter | AuthPro has a Free account and no server code; MemberSpace Starter is $39 per month billed annually |
| Sell memberships, newsletters or courses | Memberful or MemberSpace | Memberful is $49 per month plus 4.9% per sale; MemberSpace Growth is $99 per month billed annually plus 2% |
| Build a consumer app | Auth0 Free or Firebase Authentication | Auth0 Free covers 25,000 MAU; Firebase Authentication is free to 50,000 MAU |
| Build a modern web app | Clerk | Hobby is free to 50,000 monthly retained users; Pro is $20 per month billed annually |
| Build a B2B app that will sell enterprise SSO | WorkOS | AuthKit is free to 1,000,000 MAU; each SSO connection is $125 per month |
| Build an app on a Postgres backend | Supabase Auth | Pro is $25 per month with 100,000 MAU included |
Frequently asked questions
Is AuthPro still available?
Yes. AuthPro is still a live hosted service at authpro.com, and its signup page offers a Free account and a Deluxe account. It protects pages with login, registration and password reminder forms you paste into your site. Its site publishes no price, so confirm the current Deluxe price with the vendor before you plan a budget around it.
Which AuthPro alternative is best for a small membership site?
MemberSpace is the closest direct replacement for most small membership sites, because it installs on a site you already own and adds subscription billing, member spaces, courses and a community forum. Memberful is the better pick for creators who sell newsletters, podcasts or downloads and want a proven checkout with coupons and group plans.
Which AuthPro alternative is cheapest for an app?
WorkOS AuthKit is cheapest for user count alone, because it is free for up to 1,000,000 monthly active users, while Auth0 Free covers 25,000 and Clerk, Firebase Authentication and Supabase Auth each cover 50,000. The cheapest pick changes once you add enterprise SSO, because WorkOS charges $125 per connection per month.
Do any AuthPro alternatives offer a free plan?
Yes. AuthPro, Auth0, Clerk, WorkOS, Firebase Authentication and Supabase Auth all have a free option, with limits from 25,000 monthly active users on Auth0 to 1,000,000 on WorkOS. Memberful offers a free trial until you go live, while MemberSpace shows no free plan on its pricing page and starts at $39 per month billed annually.
What is the difference between monthly active users and monthly retained users?
A monthly active user counts when a user signs in or acts during the month, which is how Auth0, Firebase Authentication and Supabase Auth count. A monthly retained user counts only when a user returns 24 hours or more after signing up, which is how Clerk counts.
Should I pick a membership tool or an identity platform?
Pick a membership tool such as MemberSpace or Memberful if you gate pages or sell access to content on a site that already exists. Pick an identity platform such as Auth0, Clerk, WorkOS, Firebase Authentication or Supabase Auth if you are building an app and need login, sign-up and social login inside that app.
Sources
- https://authpro.com/
- https://www.memberspace.com/
- https://www.memberspace.com/pricing
- https://memberful.com/
- https://memberful.com/pricing
- https://auth0.com/
- https://auth0.com/pricing
- https://clerk.com/
- https://clerk.com/pricing
- https://workos.com/
- https://workos.com/pricing
- https://firebase.google.com/
- https://firebase.google.com/pricing
- https://supabase.com/
- https://supabase.com/pricing
Prices and features were read on each company’s own website in November 2026. They change often, so confirm the current offer on the official site before you sign up or buy.