Backend-as-a-Service
The biggest real distinction between ThingsBoard and Kairos is straightforward: Kairos is free and open-source, while ThingsBoard is a commercial product (freemium with paid upgrades). ThingsBoard sits at freemium with paid upgrades and carries low lock-in, while Kairos sits at free and open-source and carries low lock-in. ThingsBoard is a fit when you need teams that need self-hosted iot with device mgmt, telemetry and rule chains — typical scenarios include open-source iot platform with device management and dashboards. 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: ThingsBoard is explicitly not for small teams wanting a polished managed iot saas with zero ops; 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 ThingsBoard cheaper while a different shape flips the answer to Kairos.
Quick take
ThingsBoard is for teams that need self-hosted iot with; 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 | freemium | free |
| Entry Price | — | — |
| Free Tier | Yes | Yes |
| Billing Complexity | — | — |
| Developer Experience | 4/5 | 4/5 |
| Pricing Transparency | 4/5 | 5/5 |
| Lock-in Level | low | low |
| Migration Complexity | — | — |
| Data Portability | — | — |
| Enterprise | — | — |
| GitHub Stars | 21.6k | 1.7k |
| License | Apache-2.0 | Apache-2.0 |
Choose ThingsBoard if your primary workload is teams that need self-hosted iot with device mgmt, telemetry and rule chains and low switching cost matters.
Not for: Small teams wanting a polished managed IoT SaaS with zero ops
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 ThingsBoard uses freemium with paid upgrades. Kairos wins on sticker price, but remember that self-hosting and maintaining OSS adds engineering overhead that ThingsBoard's paid plan removes.
Migrating from ThingsBoard to Kairos is generally feasible because ThingsBoard has low lock-in, so data and configuration are usually portable. 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 ThingsBoard running in parallel until Kairos is verified.
Our data gives ThingsBoard and Kairos the same developer experience score (4/5), so neither has a clear edge on DX by that measure. The differentiator is usually how each tool fits your workflow — things like CLI quality, docs, local dev loop, and error messages. The safest call is to pilot both on a representative task and see which one gets out of your way.
Kairos is in the same category as ThingsBoard (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 ThingsBoard targets teams that need self-hosted iot with device mgmt, telemetry and rule chains — 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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