InstantDB vs Convex: Which is Better in 2026?
Choosing between InstantDB and Convex comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Convex wins this matchup. OutSystems is our overall Low-Code Backend pick. Sanity is our free Low-Code Backend pick. Pick InstantDB if you need data & databases.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
InstantDB
Build delightful apps in less than 10 minutes with a batteries-included client-side database.
Best for you if:
- • You want significantly reduces backend development time for frontend developers
- • You want provides a comprehensive suite of backend features in one SDK
Convex
Real-time backend platform for reactive apps
Best for you if:
- • You want real-time first
- • You want great DX
| At a Glance | InstantDB | |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | Data & Databases | Low-Code Backend |
Rating | - | 4.6/5G2 4.5 · SourceForge 5.0 |
Free plan | Yes | Yes |
Watch out for | Database space overage at $0.125 per GB on Pro/Startup | EU hosting adds a 30% surcharge on all usage, significant for European teams |
Choose InstantDB or Convex?
Choose InstantDB if
Build delightful apps in less than 10 minutes with a batteries-included client-side database.
- You want significantly reduces backend development time for frontend developers
- You want provides a comprehensive suite of backend features in one SDK
- Your work is data & databases-shaped, not low-code backend-shaped
Choose Convex if
Real-time backend platform for reactive apps
- You want real-time first
- You want great DX
- Your work is low-code backend-shaped, not data & databases-shaped
| Feature | InstantDB | Convex |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | No ratings yet | ★4.6/5 6 reviews |
| Categories | Data & DatabasesLow-Code Backend | Low-Code BackendServerless |
In-Depth Analysis
InstantDB
Build delightful apps in less than 10 minutes with a batteries-included client-side database.
InstantDB offers a very generous Free tier with 1GB database space and unlimited API requests, making it excellent for individual developers and small projects.
Watch out
Database space overage at $0.125 per GB on Pro/Startup
Strengths
- +Significantly reduces backend development time for frontend developers
- +Provides a comprehensive suite of backend features in one SDK
- +Enables real-time and collaborative app experiences easily
- +Built-in offline support improves user experience and app availability
- +Handles complex data operations like optimistic updates automatically
Weaknesses
- -May require learning a new SDK/paradigm for developers accustomed to traditional backends
- -Reliance on a third-party service for core backend functionality
Key features
Convex
Real-time backend platform for reactive apps
Convex Free tier is generous for side projects: 1M function calls/mo and 0.5GB storage at no cost.
Watch out
EU hosting adds a 30% surcharge on all usage, significant for European teams
Strengths
- +Real-time first
- +Great DX
- +TypeScript native
Weaknesses
- -Vendor lock-in
- -Newer platform
Key features
Pricing: InstantDB vs Convex
| Plan | InstantDB | Convex |
|---|---|---|
| Tier 1 | $0/month Free | $0 Free |
| Tier 2 | $30/month Pro | $25/developer Professional |
| Tier 3 | $600/month Startup | N/A |
| Tier 4 | Custom Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on InstantDB pricing and Convex pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: InstantDB
Want the highest-rated option?
Convex is rated 4.6/5. InstantDB has no ratings yet.
Go with: Convex
Value user reviews?
InstantDB: no ratings yet. Convex: 6 reviews (4.6/5).
Go with: Convex
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
InstantDB is a data & databases tool. Convex is in low-code backend. Pick the category that matches your needs.
How important are ratings?
Convex is rated 4.6/5; InstantDB has no ratings yet.
Key Takeaways
Convex
- Free tier available
- Our pick for this comparison
InstantDB
- Better fit for data & databases
The Bottom Line
Convex wins this matchup. OutSystems is our overall Low-Code Backend pick. Sanity is our free Low-Code Backend pick.
Frequently Asked Questions
Is InstantDB or Convex better?
Convex is rated in our evaluation. Both are freemium.
What are InstantDB and Convex used for?
InstantDB: Build delightful apps in less than 10 minutes with a batteries-included client-side database.. Convex: Real-time backend platform for reactive apps.
What does InstantDB cost vs Convex?
InstantDB is freemium (free tier + paid plans). Convex is freemium (free tier + paid plans). Visit their websites for detailed pricing.