Firebase Authentication vs Lets Encrypt: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Firebase Authentication and Lets Encrypt side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Firebase Authentication
Backend authentication by Google
Best for you if:
- • You want easy to implement
Lets Encrypt
Free automated SSL/TLS certificates
Best for you if:
- • You want a fully free tool (Firebase Authentication requires payment)
| At a Glance | Firebase Authentication | Lets Encrypt |
|---|---|---|
Starts at | Free plan | Free 100% free |
Category | Identity & Access Developer Tools | Security Developer Tools |
Rating | 4.9/5 G2 4.9 5 reviews | 4.8/5 G2 4.8 20 reviews |
Free plan | Yes | Yes |
Watch out for | Phone verification costs $0.01-$0.06 each. | Certificates valid for only 90 days |
Choose Firebase Authentication or Lets Encrypt?
Choose Firebase Authentication if
- You want easy to implement
- You want multiple auth methods
- You work in identity & access, not security
Choose Lets Encrypt if
- You want a fully free tool (Firebase Authentication requires payment)
- You want free SSL certificates
- You want automated renewal
- You work in security, not identity & access
In-Depth Analysis
Firebase Authentication
Backend authentication by Google
Firebase Authentication's Spark plan is incredibly generous, offering 50,000 MAU for free, which is far more than many competitors.
Watch out
Phone verification costs $0.01-$0.06 each.
Strengths
- Pro: Easy to implement
- Pro: Multiple auth methods
- Pro: Free generous tier
- Pro: Good security
Weaknesses
- Con: Vendor lock-in
- Con: Limited customization
- Con: Part of Google ecosystem
Key features
Lets Encrypt
Free automated SSL/TLS certificates
Let's Encrypt offers an exceptionally fair and generous pricing model, as it is entirely free.
Watch out
Certificates valid for only 90 days
Strengths
- Pro: Free SSL certificates
- Pro: Automated renewal
- Pro: Wide support
- Pro: Open source
- Pro: Industry standard
Weaknesses
- Con: 90-day certificates
- Con: No wildcard easy
- Con: Setup complexity
- Con: Rate limits
- Con: No warranty
Key features
Plans and prices: Firebase Authentication vs Lets Encrypt
| Tool | Plans and prices | Source |
|---|---|---|
| Firebase Authentication |
| firebase.google.com/pricing read Nov 3, 2026 |
| Lets Encrypt |
| letsencrypt.org read Sep 29, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Firebase Authentication pricing and Lets Encrypt pricing.
Key Takeaways
Firebase Authentication
- Choose if you want backend authentication by Google
Lets Encrypt
- Choose if you want free automated SSL/TLS certificates
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- User ratings rest on too few reviews to rank (4.9/5 from 5 reviews for Firebase Authentication, 4.8/5 from 20 reviews for Lets Encrypt; we compare ratings only above 20 reviews on both sides).
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Firebase Authentication and Lets Encrypt compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. User ratings rest on too few reviews to rank (4.9/5 from 5 reviews for Firebase Authentication, 4.8/5 from 20 reviews for Lets Encrypt; we compare ratings only above 20 reviews on both sides). Both have a free plan.
What are Firebase Authentication and Lets Encrypt used for?
Firebase Authentication: Backend authentication by Google. Lets Encrypt: Free automated SSL/TLS certificates.
What does Firebase Authentication cost vs Lets Encrypt?
Firebase Authentication has no public paid-plan price on file. Lets Encrypt is free. Prices read on the vendors' pricing pages, latest check Nov 3, 2026.
What's the main difference between Firebase Authentication and Lets Encrypt?
Firebase Authentication's main strength: easy to implement. Lets Encrypt's main strength: free SSL certificates.