No engineer required
No engineer on the project to own prompts, tools, and telephony
Looking for
an alternative
to Retell AI?
Guzli vs Retell AI is a no-code front line versus a latency-sensitive voice API. Retell is for teams that want SDKs, SIP, IVR, DTMF, and live take-over.
When compared with Retell AI, Guzli does this better
- Hobby plan, chat only
- $49/mo
- Voice on the Standard plan
- $149 + 16¢/min
- Knowledge base for chat and voice
- 1
Trusted by 100+ businesses
Why teams consider a Retell AI alternative
Chat and voice on one agent
The widget and the inbound receptionist must share one knowledge base — not two agent IDs
Billing you can forecast
You do not want to assemble STT, TTS, and LLM keys or watch component meters
Keep the desk you already run
You will keep Zendesk or HubSpot and only wanted one front line on chat and inbound
Procedures Step-by-step instructions you write in plain English, like a checklist for a new hire. Guzli follows them to handle refunds, bookings or order issues the same way every time. Learn more let you write plain-English steps the agent follows for repeatable customer requests.
Copilot An assistant for your team. Ask it about customer conversations to find trends and gaps in your answers, then review its suggested fixes before they go live. Learn more helps your team find patterns in customer conversations and review suggested improvements.
Everything in this section is based on public information reviewed September 2026.
Set it up the way you’d brief a new hire
Northwind Assistant / Knowledge
Search…⌘K
N
Knowledge
Everything your agent has learned, and where it came from.
412 MB of 1 GB14 of 200 sources
Health
Needs attention
Two sources are going stale and one connection stopped syncing.
Healthy
All sources fresh and every connection syncing.
Performance
84% of replies answered from knowledge
12% vs the last 30 days
Used most
- 1Help center214
- 2Return & refund policy.pdf186
- 3Shipping & delivery FAQ122
Replies grounded in each source · 30 days
Library
All14 Files3 Web pages3 Help articles2 Tickets & chats2 Notion pages2 Snippets1 Q&A1 Needs review12 Map Connections
Google Drive
Synced 2h ago
Notion
Synced 5h ago
Zendesk
Syncing now…
Intercom
Reconnect to keep syncingSynced just now
SharePoint
Synced yesterday
Syncing now
Reading help.northwind.com36 of 58 pages read
Search the library
Any status
Any app
Return & refund policy.pdf
Uploaded by you
checked 2h ago
ReadyProduct catalog — Spring 2026.xlsx
Uploaded by Maya
checked 2h ago
ReadyHandbook / Support playbook.docx
Drive · /Handbook
synced 2h ago
ReadyPricing
northwind.com/pricing
synced 6h ago
ReadyHelp center
northwind.com/help · 42 pages
synced yesterday
ReadyDeveloper docs
docs.northwind.com
reading nowsynced just now
ProcessingReadyGetting started with Northwind
Zendesk · Help center
synced 3h ago
ReadyShipping & delivery FAQ
Zendesk · Help center
synced 3h ago
ReadySolved tickets — March to May
Zendesk · 120 tickets
synced 3h ago
ReadyBilling conversations
Intercom · tagged “billing”
last synced 9 days ago
Needs attentionCompany handbook
Notion · 12 pages
synced 5h ago
ReadyProduct specs — Widgets 2.0
Notion · 4 pages
synced 5h ago
ReadyHoliday shipping cutoffs
Written by you
updated 3 days ago
ReadyTop customer questions
Written by Maya · 12 pairs
updated last week
ReadyMake it smarter
Small changes with an outsized effect on answers.
Split the shipping FAQ into per-region answers
Customers ask region-specific questions the current FAQ answers generically.
Not now
Add your order-tracking pages to the site crawl
Your agent explains tracking often but can't point to the actual steps.
Not now
Settle on one return window
Two sources disagree, so answers change depending on which one the agent quotes.
Not now
Review suggested content
3 drafts your agent wrote from real conversations
What should your agent learn?
Pick a source — you can add as many as you like.
Upload files
PDFs, docs, and spreadsheets from your computer.
Crawl a website
We read your site and keep it fresh.
Write it yourself
A quick note or ready-made answers.
Import from an app
Drive, Notion, Zendesk, Intercom, and more.
Website URL
https://
We'll crawl up to 200 pages and re-check weekly.
Northwind/Northwind Assistant● LiveN
Build / Instructions
Agent instructions
✓ Saved
You are the Northwind customer experience agent.
Be warm, direct, and concise. Start by understanding what the customer is trying to accomplish. Use approved sources for product and policy answers. Never invent an answer; say when something is not covered.
When an account change is requested, verify the customer first, follow the relevant procedure, and clearly confirm what changed.
Northwind/Northwind Assistant● LiveN
Build / Model
Choose a model
Claude Sonnet 4.6 Anthropic
Balanced reasoning and speed
Balanced reasoning and speed
GPT-5 OpenAI
Deep reasoning for complex cases
Deep reasoning for complex cases
Gemini 2.5 Pro Google
Strong long-context understanding
Strong long-context understanding
Grok 4 xAI
Fast, natural conversations
Fast, natural conversations
Automatic routing
Let Guzli select the best available model for each task while respecting your cost and latency limits.
Guzli vs Retell AI, side by side
Choose Guzli if website chat and the phone must share one knowledge base and one bill. Choose Retell AI if you have engineers and want a latency-sensitive voice API. Choose Vapi if you want to assemble STT, LLM, TTS, and telephony yourself.
| Feature |  | |
|---|---|---|
| Decision criteria | ||
| Ops can run it without a pull requestRetell has a dashboard; production usually wants API and telephony ownership. Vapi is API-first. Guzli is no-code | Yes | Partial |
| One published invoice (plan + bundled ¢/min)Guzli publishes plan + talk ¢/min. Retell’s dashboard base rate can pick up an LLM token surcharge. Vapi $0.05/min is hosting only | Yes | Partial |
| Start on a self-serve plan, no sales call | Yes | Yes |
| No per-resolution fee | Yes | Partial |
| Team members included in the plan, not billed per seat | Yes | Partial |
| Agent stays online when usage runs over | Yes | Partial |
| Choose the AI model each agent runs on | Yes | Yes |
| Remove vendor branding from the widget | Partial | Partial |
| Channels | ||
| Developer API / SDKs / SIP / IVRRetell and Vapi are the voice APIs. Session Initiation Protocol (SIP), interactive voice response (IVR), and dual-tone multi-frequency (DTMF) keypad tones are Retell’s job. Guzli exposes API and webhooks from Standard up and will not out-API Retell | Partial | Yes |
| Website chatbotGuzli ships a site-support chatbot. Retell has chat agents and a web voice widget. Vapi messaging is a developer surface | Yes | Partial |
| Inbound phoneAll three answer inbound. Guzli Standard is 3 concurrent lines; Pro is 8 | Yes | Yes |
| Outbound at contact-center volumeRetell and Vapi scale concurrency. Guzli outbound fits 3–8 lines | Partial | Yes |
| Shared knowledge for chat + voiceGuzli trains once. Retell can attach a KB to agents; the website is still a separate product for most teams | Yes | Partial |
| Unified inbox + auto-create ticketsGuzli is the front line into Zendesk or HubSpot, not a Retell or Vapi replacement | Yes | No |
| Live call-center take-overRetell documents warm transfer, listen-in, and take-over. Guzli transfers at 5¢/min Standard, 4¢/min Pro | Partial | Yes |
| Workflows | ||
| Named tools (Shopify, Stripe, Calendly, Zendesk)Guzli ships named allowlist tools (Shopify, Stripe, Calendly, Zendesk, HubSpot, Salesforce, Slack, WhatsApp, Zapier, custom API) when those jobs apply | Yes | Partial |
| Takes actions in your tools: refunds, bookings, lookups | Yes | Partial |
| Procedures — plain-English instructions for repeatable work Step-by-step instructions you write in plain English, like a checklist for a new hire. Guzli follows them to handle refunds, bookings or order issues the same way every time. Learn more | Yes | Partial |
| Creates tickets in Zendesk, HubSpot or Salesforce | Yes | Partial |
| Trains on past tickets and help-center content | Yes | Partial |
| Pauses for human approval before sensitive steps | Yes | Partial |
| Copilot — answers and insights from customer conversations An assistant for your team. Ask it about customer conversations to find trends and gaps in your answers, then review its suggested fixes before they go live. Learn more | Yes | — |
| Testing | ||
| Simulate customer conversations before going live | Yes | Partial |
| Regression suite re-runs on every change | Yes | Partial |
| Full trace of what the agent retrieved and did | Yes | Partial |
| Security | ||
| SOC 2 Type II | Yes | Partial |
| GDPR compliance | Yes | Partial |
| SAML single sign-on (SSO) | Yes | Partial |
| Custom roles and permissions | Yes | Partial |
| Audit logs of every dashboard change | Yes | Partial |
| Customer data never used to train models | Yes | Partial |
Frequently asked questions
Live docs scale billed duration when the prompt is over 4,000 tokens. An April 2026 staff reply used 3,500. In that thread, a sub-four-minute call at a 13.6¢/min dashboard rate billed about 76¢ because of the surcharge. There was no dedicated token-threshold alert.
This page does not claim that. Openbenchmarks measured Retell at 1,740 ms median TTFAB on real calls (1 August 2026). Guzli publishes no competing SLA and is not on that board.
When you sell a voice API, need SIP/IVR/DTMF, live take-over, or concurrency above Guzli’s 3–8 lines. Guzli will not out-API Retell.
Vapi is the other assembler: you wire speech-to-text (STT), the language model (LLM), text-to-speech (TTS), and telephony, often with your own keys. Its $0.05/min is hosting, not an all-in minute.
Choose Guzli if website chat and the phone must share one knowledge base and one bill. Choose Retell AI if you have engineers and want a latency-sensitive voice API. Choose Vapi if you want to assemble STT, LLM, TTS, and telephony yourself.
Yes. Chat from $49/mo; voice starts Standard $149 + 16¢/min. Retell AI: Pay-as-you-go per-minute voice with component meters. The dashboard base rate can pick up an LLM token surcharge. Live docs (read 20 Sep 2026) scale billed duration when prompts exceed 4,000 tokens. An April 2026 community thread used a 3,500-token threshold for the same surcharge.
Discover how we stand out from other competitors
Side-by-side comparisons of Guzli and the AI chatbot, helpdesk, and voice agent platforms support teams shortlist most.
Explore other features
One agent across the whole platform. The same knowledge, the same brand voice, wherever the conversation goes.
Product overview
Build, deploy and optimize AI Agents.
Procedures
Train your agent like a new teammate.
Helpdesk
Hand off complex issues to humans.
Copilot
Ask your conversations what customers need.
Email campaigns
Send campaigns that start a conversation.
Voice campaigns
Reach customers with a natural voice.
The world’s best customer experiences run on Guzli
Join 100+ teams using Guzli to build AI agents that deliver exceptional support at scale — across chat, email, and voice.