🧰 Frameworks
LangGraph vs Vapi: Which Should You Choose?
Both are developer framework agents, but they are built for different people. Here is the honest split.
LangGraph
by LangChain
A low-level orchestration framework for agents that need durable state, loops and human approval mid-run.
Vapi
by Vapi
A developer-first voice agent platform where every layer of the pipeline is swappable.
Side by side
LangGraph vs Vapi at a glance
| 🕸️ LangGraph | 🎙️ Vapi | |
|---|---|---|
| Editor score | 4.2★★★★★ | 4.1★★★★★ |
| Vendor | LangChain | Vapi |
| Autonomy | Semi-autonomous | Fully autonomous |
| Deployment | Self-hosted, Cloud, API | Cloud, API |
| Starting price | Free tier | Free tier |
| Pricing model | Free open-source library; paid managed platform and observability | Per-minute platform fee plus provider costs at cost |
| Free tier | Yes — the framework is MIT-licensed and free | Yes — 60+ minutes included on the Build plan |
| Integrations | 5 native | 8 native |
| Best for | Engineering teams shipping agents to production | Developers building voice into a product |
Decision
Which one should you pick?
Choose LangGraph if…
- Engineering teams shipping agents to production. The strongest fit. Durability, approval gates and observability are exactly what production demands and prototypes ignore.
- Teams that outgrew a higher-level framework. The common migration path — people arrive here when autonomous delegation became too opaque to debug.
- Regulated industries needing approval gates. Native interrupts make a human sign-off a first-class part of the run rather than a bolt-on.
Skip it if: Hardest framework here to learn is a dealbreaker for you.
Choose Vapi if…
- Developers building voice into a product. The intended user. Full pipeline control and an API-first design.
- Teams running voice at high volume. Per-layer optimisation meaningfully reduces per-minute cost once minutes are real.
- Agencies deploying for many clients. Programmatic provisioning makes many similar deployments manageable.
Skip it if: Requires engineering to use well is a dealbreaker for you.
Trade-offs
Strengths and weaknesses
LangGraph
- The most production-ready agent framework available
- Durable state survives crashes and long pauses
- Explicit graphs are debuggable in a way delegation is not
- Hardest framework here to learn
- Verbose compared with higher-level options
- Observability effectively requires the paid product
Vapi
- Most flexible voice platform available
- Per-layer cost and quality optimisation
- Strong telephony feature coverage
- Requires engineering to use well
- Costs span multiple providers
- More configuration means more failure modes
FAQ
LangGraph vs Vapi FAQ
Is LangGraph better than Vapi?
On our scoring LangGraph edges it at 4.2/5 against 4.1/5, but the gap is smaller than the difference in who they suit. LangGraph is the better choice for engineering teams shipping agents to production; Vapi is stronger for developers building voice into a product.
Which is cheaper, LangGraph or Vapi?
LangGraph: Free tier — free open-source library; paid managed platform and observability. Vapi: Free tier — per-minute platform fee plus provider costs at cost. Compare the pricing models rather than the headline numbers; consumption-based plans can overtake a higher flat fee quickly once usage is real.
Can I use LangGraph and Vapi together?
Yes, and plenty of teams do. They share 4 integrations, so both can sit on the same data without duplicated plumbing. The usual pattern is to run each on the work it is strongest at rather than forcing one to cover everything.
What are the main differences between LangGraph and Vapi?
Three things matter most. Autonomy: LangGraph is semi-autonomous while Vapi is fully autonomous. Deployment: LangGraph runs self-hosted/cloud/api, Vapi runs cloud/api. Pricing model: free open-source library; paid managed platform and observability versus per-minute platform fee plus provider costs at cost.