Comparison tool
Compare AI tools side by side
Prices in each vendor’s own unit, features with the quote behind them, and the date every fact was read.
Pick two to four products. The address bar keeps your selection, so you can share the link.
Price and billing
| VapiVoice agents | Retell AIVoice agents | Bland AIVoice agents | SynthflowVoice agents | |
|---|---|---|---|---|
| Free plan | Not verified | Not verified | Not verified | Not verified |
| Free trial | $5 in free credits on the pay-as-you-go option | $10 in free credits | 2 credits plus an inbound number on signup, no card required | Not verified |
| Starts at | $0.05 per minute hosting, plus model, voice and telephony | From $0.07 per minute, all components | From $0.14 per minute talk time, telephony extra | From $30,000/year |
| Billing model | subscription + per minute + usage-based | per minute + usage-based + per call + usage credits | subscription + per minute | subscription |
| Enterprise | Contact sales | Contact sales | Contact sales | Contact sales |
| Checked | 16 October 2026 | 16 October 2026 | 16 October 2026 | 16 October 2026 |
| Official pricing | Open | Open | Open | Open |
These products bill in different ways, so their starting prices are not directly comparable. Work out a normal month in each one’s own unit.
Features
Confirmed on the vendor’s site Vendor says it is not offered Not verified (not the same as no)
| Feature | Vapi | Retell AI | Bland AI | Synthflow |
|---|---|---|---|---|
| Website chat widget | Yes | Yes | Yes | Not verified |
| Learns from your content | Yes | Yes | Yes | Yes |
| Document upload | Yes | Yes | Yes | Not verified |
| Voice conversation | Yes | Yes | Yes | Yes |
| Phone calls | Yes | Yes | Yes | Yes |
| Takes actions on its own | Yes | Yes | Yes | Yes |
| Hand-off to a person | Yes | Yes | Yes | Yes |
| Developer API | Yes | Yes | Yes | Yes |
| Integrations | Yes | Yes | Yes | Yes |
| CRM connection | Yes | Yes | Yes | Yes |
| Books appointments | Yes | Yes | Yes | Yes |
| Multiple languages | Yes | Yes | Yes | Yes |
| Analytics | Yes | Yes | Yes | Yes |
| Remove branding | Not verified | Not verified | Not verified | Yes |
| Enterprise controls | Yes | Yes | Yes | Yes |
Hover a mark to see the quote it is based on. Rows where nothing could be verified are hidden.
Plans
Vapi
No Success Package
Pre-paid, $0.05/min Vapi hosting · Models pass-through at cost · 4 concurrent calls · 1 phone number · 14 days data retention
Free
Core
Pre-paid, auto-renew · 10 concurrent calls · 5 phone numbers · 30 days retention · Email support
$29/month per account
Pro
10% of Vapi hosting fee · $999/mo minimum · 30 concurrent calls · 10 phone numbers · 180 days retention · 99% uptime SLA
$999/month per account
Premier
Custom concurrency and retention · 99.9% uptime SLA · SSO · Dedicated SIP
Contact sales
Usage charges
- Vapi hosting: $0.05 per minute
- HIPAA compliance add-on: $2,000 per month
- Additional concurrency: $10 per line per month
- Additional organization: $20 per organization per month
Retell AI
Pay as you go
$0.07-$0.31 / min for AI Voice Agents · $0.002+/ msg for AI Chat Agents · First 20 concurrent calls free
No public price
Enterprise
Custom concurrency starting at 50+ calls
Contact sales
Usage charges
- Retell Voice Infra: $0.055 per minute
- Voice: Retell Platform Voices: $0.015 per minute
- Voice: ElevenLabs Flash: $0.04 per minute
- LLM: Claude 5.5 Sonnet: $0.064 per minute
- LLM: GPT 5.4 mini (standard): $0.024 per minute
- Speech-to-speech: GPT Realtime: $0.345 per minute
- Telephony (Twilio/Telnyx, listed countries): $0.015 per minute
- Retell phone number: $2 per number per month
- Extra concurrency (beyond 20): $8 per concurrent call per month
- Knowledge base usage: $0.005 per minute
- Extra knowledge base (beyond 10): $8 per knowledge base per month
- Batch call: $0.005 per dial
- Branded call: $0.10 per outbound call
- SMS: $0.01 per message
Bland AI
Start
$0.14/min talk time · $0.05/min transfer time · 100 calls/day, 100 calls/hour · 10 concurrent calls · 1 voice · 10 knowledge bases
Free
Build
$0.12/min talk time · $0.04/min transfer time · 2,000 calls/day, 1,000 calls/hour · 50 concurrent calls · 5 voices · 50 knowledge bases
$299/month per account
Enterprise
Custom talk and transfer rates · Unlimited daily and hourly caps · Unlimited voices and knowledge bases
Contact sales
Usage charges
- Talk time (Start): $0.14 per minute
- Transfer time (Start): $0.05 per minute
- Talk time (Build): $0.12 per minute
- Transfer time (Build): $0.04 per minute
Synthflow
Enterprise
Contracts start at $30,000 annually · Custom concurrency planning · Synthflow Native Telephony, SIP trunking, or approved enterprise telephony
$30,000/year
SpideyChat makes a website chat assistant and is listed in this directory alongside other products. We are not affiliated with, sponsored by or endorsed by any other company named here, and their names and trademarks belong to them. Facts are read from each vendor’s own pages on the date shown and can change; check the vendor’s site before you buy. Spotted something out of date? Email support@spideychat.com.