Backend-as-a-Service
The biggest real distinction between Convex and Kairos is straightforward: Kairos is free and open-source, while Convex is a commercial product (hybrid pricing with $25/member/mo (Pro), a free tier, enterprise plan available). Convex sits at hybrid pricing with $25/member/mo (Pro), a free tier, enterprise plan available and carries high lock-in, while Kairos sits at free and open-source and carries low lock-in. Convex is a fit when you need mobile, teams — typical scenarios include mvp/prototyping speed. Kairos is aimed at edge computing teams running fleets of kubernetes devices needing immutable os, with workloads like immutable linux for edge kubernetes with bootable os images as the common case. The honest trade-off: Convex is explicitly not for complex custom business logic; Kairos is not intended for traditional datacenter workloads or teams without kubernetes experience. On cost specifically, pricing model matters more than sticker price — one workload can make Convex cheaper while a different shape flips the answer to Kairos.
Quick take
Convex is for mobile, teams; Kairos is for edge computing teams running fleets of; decide based on cost model and budget.
| | | |
|---|---|---|
| Category | Backend-as-a-Service | Backend-as-a-Service |
| Pricing Model | hybrid | free |
| Entry Price | $25/member/mo (Pro) | — |
| Free Tier | Yes | Yes |
| Billing Complexity | low | — |
| Developer Experience | 5/5 | 4/5 |
| Pricing Transparency | 4/5 | 5/5 |
| Lock-in Level | high | low |
| Migration Complexity | high | — |
| Data Portability | Via API export | — |
| Enterprise | Available | — |
| GitHub Stars | 11.3k | 1.7k |
| License | NOASSERTION | Apache-2.0 |
High — reactive data model proprietary, no standard SQL
Migration difficulty: high
Data you keep: Via API export
API standard: Proprietary
Risk notes: High — reactive data model proprietary, no standard SQL
💡 Plan 2-4 weeks minimum. Consider running parallel during migration
Choose Convex if your primary workload is mobile, teams and hybrid pricing ($25/member/mo (Pro)) is acceptable.
Not for: Complex custom business logic
Choose Kairos if your primary workload is edge computing teams running fleets of kubernetes devices needing immutable os and you want a free/OSS tool with no vendor bill.
Not for: Traditional datacenter workloads or teams without Kubernetes experience
Check each tool's dedicated page for deeper reviews, setup notes, and pros/cons.
No — Kairos is free and open-source, while Convex uses hybrid pricing with $25/member/mo (Pro), a free tier, enterprise plan available. Kairos wins on sticker price, but remember that self-hosting and maintaining OSS adds engineering overhead that Convex's paid plan removes.
Migrating from Convex to Kairos is not trivial — Convex has high lock-in, which typically means data formats, APIs, or stack assumptions that have to be rewritten. Since both tools sit in the same category (Backend-as-a-Service), the conceptual mapping is closer, but you still need to validate feature parity against your specific workload. Plan migration as a project, not a script: inventory integrations, test on non-production workloads, and keep Convex running in parallel until Kairos is verified.
On our 0–5 developer experience scale, Convex scores higher (5/5 vs 4/5 for Kairos). The gap is one point — meaningful but not decisive, since DX is workflow-dependent. Still, score your own tasks: DX is subjective and tied to stack assumptions.
Kairos is in the same category as Convex (Backend-as-a-Service), so it's a reasonable alternative to evaluate. Kairos is aimed at edge computing teams running fleets of kubernetes devices needing immutable os, while Convex targets mobile, teams — that difference should drive the switch decision. Note that Kairos is explicitly not for traditional datacenter workloads or teams without kubernetes experience — if that describes your workload, it's not a viable replacement.
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