Synthflow is no-code-only. Burki is code-first with a full dashboard. Here's the comparison teams typically run after hitting Synthflow's ceiling.
| Feature | Burki | Synthflow |
|---|---|---|
| Platform Fee | $0.03/min | $0.13–$0.20/min effective |
| Free Trial | 200 minutes | Limited free tier |
| Per-plan minute caps | None | Yes, per tier |
| Provider Markup | 0% (BYO) | Bundled, opaque |
| Feature | Burki | Synthflow |
|---|---|---|
| Response Latency | 0.8 seconds | 2–3 seconds |
| Concurrent Calls | Unlimited | Plan-limited |
| Feature | Burki | Synthflow |
|---|---|---|
| LLM Providers | 50+ | ~5 (managed) |
| TTS Providers | 15+ | ~3 (managed) |
| BYO API Keys | Full support | Not supported |
| Custom tools / functions | Full API + auto-discovery | Limited builder UI |
| RAG / Knowledge Base | Native pgvector + S3 docs | Basic |
| Feature | Burki | Synthflow |
|---|---|---|
| REST + WebSocket API | Yes | Limited |
| Multi-tenant architecture | Built-in | Agency tier add-on |
| White-label dashboard | Full theming + subdomain | Limited |
| No-code dashboard | Yes | Yes |
| Open documentation | Public + open-source examples | Login-gated |
Common reasons developers and agencies migrate.
You want Anthropic Claude, Cartesia, or Groq specifically — Synthflow's managed list doesn't include them.
Burki integrates 50+ providers and lets you swap any of them per assistant.
Synthflow's plan tiers cap monthly minutes and charge overage. Forecasting is painful.
Burki is pay-as-you-go: $0.03/min flat, no caps, no overage gotchas.
Synthflow's agency tier exists but per-tenant theming, API keys, and isolation are limited.
Burki was built multi-tenant from day one — purpose-built for agencies running 10+ clients.
Once your tool calls require auth, branching, or async work, the no-code UI gets in the way.
Burki's tool-calling is fully programmable via API + AWS Lambda auto-discovery.
Common questions about switching from Synthflow to Burki.
Yes. Burki charges a transparent $0.03/min platform fee on top of actual provider costs (Twilio + Deepgram + your chosen LLM + TTS, all at provider rates). Synthflow bundles everything into per-plan minute caps starting at $29/mo for ~100 minutes and rising to $375+/mo for higher tiers, plus per-overage charges. For any team running more than a few hundred minutes per month, Burki ends up significantly cheaper — and with BYO keys you can drop the cost further.
Yes. The conceptual model is the same — a system prompt, a voice, an LLM, optional tools/webhooks — so most Synthflow agents port over in well under an hour. The differences you'll notice on Burki: provider choice is no longer locked, your prompts can be longer / RAG-backed, and tool definitions get type-checked. We provide a migration checklist for Synthflow users on request.
Burki targets ~0.8s end-to-end response latency by aggressively pipelining STT, LLM, and TTS. Synthflow's hosted runtime typically lands in the 2-3 second range depending on which LLM and TTS you've chosen. The difference is most noticeable on longer-form conversations where the latency compounds turn over turn.
Synthflow operates a fully managed runtime — you pick from their supported provider list and they handle billing. Burki's BYO mode is the opposite: you bring your own Twilio, Deepgram, OpenAI, ElevenLabs (etc.) keys and pay providers at their wholesale rates. Burki then only charges the $0.03/min platform fee. For high-volume or enterprise customers this can cut total cost 30-60% vs. any bundled-pricing platform.
Burki is built code-first but ships a complete dashboard so non-engineers on your team can build, configure, and manage voice agents without writing code. The difference vs. Synthflow is that the moment you need something the UI doesn't expose (custom tool calls, RAG over your own docs, programmatic tenant provisioning, complex routing logic), Burki has a full REST + WebSocket API ready. With Synthflow you typically hit the no-code ceiling and need to migrate.
Burki was designed multi-tenant from day one — every model is org-scoped, you get per-tenant API keys, custom subdomains, full theming, and Stripe Connect for client billing. Synthflow offers agency plans, but per-tenant isolation, branding depth, and reseller billing are more limited. For agencies running 10+ client deployments, Burki's primitives are purpose-built for that scale.
Same conceptual model — prompt + voice + LLM + tools — with a ceiling you can't hit.
Start Free Migration200 free minutes. No credit card required.
This comparison is based on Synthflow's public documentation and pricing as of April 2026. Verify current pricing on synthflow.ai.