AI assistants and search decision
voisa.ai
A capable developer can build a narrow hosted inbound-call assistant (STT, TTS, dialog, calendar integration) themselves, but reproducing VOISA's full product (voice catalogue, 8k integrations, EU-hosted GDPR assurances and enterprise polish) is impractical for a one-person DIY effort.
Visit website↗Not priced
No pricing page we fetched carried a figure, so there is nothing to compare against. The build side is still real.
$100one-off120 h to build
$250/mo6 h/mo upkeep
No published price to break even against.
Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need - the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship. All voisa.ai alternatives, with the arithmetic →
What a replacement has to do
- Answer inbound calls with speech-to-text → run simple dialog/intent logic against a knowledge base → book calendar slots or forward to staff → synthesize speech and return audio over SIP/telephony → log transcripts and events and trigger webhooks.
What it still won’t have
- Production-grade voice library (250+ studio voices) and native voice-cloning UX
- Large catalogue of 8,000+ prebuilt integrations and the vendor's tested Zapier/Make connectors
- EU-hosted, GDPR-tailored hosting, and vendor-provided AVV / enterprise SLAs
- Polished dashboard, templates for 120+ industries, and customer success/priority support
What remains hard
- Compliance and regulation
DSGVO-konform · Server in Deutschland
- Integration maintenance
8.000+ vorgefertigte Integrationen
First-year cost
No published price
voisa.ai does not publish a price we could read, so there is nothing to compare against. What building costs is below.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal AI phone-agent service using Node.js (Express) + Postgres hosted on a small VPS (Hetzner or AWS t3.small). Use Twilio Programmable Voice (SIP) for inbound calls, stream audio to the server, transcribe with OpenAI/Whisper API (or Google Speech-to-Text), run a simple rule-based/dialog manager (intent matching + slot filling) and implement actions: (1) check and book Google Calendar via OAuth, (2) call a webhook to forward structured orders, (3) escalate to human by initiating a call-forward. Synthesize responses with a cloud TTS (Google/ElevenLabs/Polly) and play back over Twilio. Provide a minimal web dashboard to view call transcripts, recordings, and set basic agent prompts/knowledge (upload CSV or short FAQ). Out of scope: multi-voice studio library, enterprise SLA, large-scale parallel call routing, advanced voice cloning. Include unit/integration tests for STT/TTS, calendar booking, and webhook delivery; add error handling, retries, logging, and basic role-based admin access.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 4 cited sources+3
- 3/3 assessment runs agreed+4
- Hard moats found in the evidence-3
- Evidence score61
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 4
Every page the run actually retrieved.
- official productVOISA product site
- official docsVOISA docs
- open sourceHeyWillow/willow
- open sourceleon-ai/leon
Integrity checks
What held up, and what did not.
