Honest comparison

Faster to the lead. Simpler to run. One price.ZEDNEX AI vs Bland, Vapi and Retell.

Short version: we call your leads in seconds and keep working them for five days, out of the box. They're the better pick if you have engineers and want to build your own. The details are below.

Talk to our AI See the scores

Quick verdict

Six categories. Who wins.

6/6

ZEDNEX AI

Speed to lead, no engineers

2/6

Bland AI

Developers

1/6

Vapi

Engineers

2/6

Retell AI

Healthcare

Core technology · Dialing · Setup · Pricing · Security · Analytics. Ties count for both.

Full comparison

At a glance. Tap a row for detail.

Six categories, four platforms. Green wins, amber partial, grey no.

ZEDNEX AIBland AIVapiRetell AI
Core technology — the detail
FeatureZEDNEX AIBland AIVapiRetell AI
AI architectureHow the AI processes audioNative audio-to-audioIn-house model, no STT/TTS pipelineLLM + STT + TTS3-stage pipelineLLM + STT + TTSBring-your-own stackLLM + STT + TTS3-stage pipeline
Response latencyAI response after caller speaks~200msIn-house audio engine~800ms average~500ms+varies by stack~700–800ms
Underlying AI modelWhat powers the voiceZEDNEX in-house systemBuilt and tuned for phone callsCustom LLMself-hostedBring your ownGPT, Claude, etc.Custom LLM + providers
Interruption handlingNatural barge-in mid-sentenceNativePartialConfigurablePartial
Voicemail detectionLive answer vs voicemail, instantBuilt-inBuilt-inManual setupBuilt-in
Calls new leads in secondsFrom CRM, Google Sheet, Meta, web formsCore product, ~5sPartialDev-firstSecondary
5-day follow-up sequenceRetries, texts, voicemail, callbacksBuilt in, five triesBuild it yourselfBuild your ownNot included
DNC list scrubbingFederal do-not-call complianceIncluded, all plansManualManualManual
Live call transfer to humanWarm handoff mid-callReal-timeSupportedSupportedSupported
Inbound answeringSame agent picks up your callsIncludedLimited UIAPI onlyBasic
Every call recorded & loggedRecording, transcript, outcomeAll plansAvailableAvailableAvailable
Target userOwners who buy leadsDevelopers / enterpriseDevelopers / engineersDevelopers / regulated industries
No-code requiredNon-technical users can operateFull dashboardVisual builderdev help neededAPI-firstSome no-code
Time to first callFrom signup to calling leads~15 minutesDays to weeksWeeksDays to weeks
Onboarding supportHelp getting your agent liveSetup call, we do it with youDiscord / docsDiscord / docsDocs + support
Visual call flow builderBuild flows without codeIncludedPathway builderJSON / API onlyBasic
ZEDNEX ManagerRun it by chattingUnique to ZEDNEX———
Pricing modelFlat monthly plansPer-minuteplan-basedPer-minute+ separate LLM/STT/TTS billsPer-minutepay-as-you-go
Entry priceMinimum to get started$499/month1,000 credits ≈ 500 min included$0.09–$0.14/min+ $15 per phone number$0.05/min base+ STT + TTS + LLM + phone$0.07–$0.31/mincomponent-based
Hidden costsWhat's not in the base priceNone — credits includedPhone numbers, SMS, failed-call feesSTT, TTS, LLM, phone4+ separate billsTelephony provider on top
Predictable monthly costFixed vs variable billingFixed plansVaries with volumeMultiple variable billsVaries with volume
Money-back guarantee30 daysNoneNoneNone
Free trial / creditsFree evaluation callFree tier100 calls/day, $0.14/min$10 starting credits$10 starting credits
SOC 2 complianceCertifiedCertifiedEnterprise tier onlySOC 2 Type 1 & 2
HIPAA complianceOn roadmapAvailable$1,000/mo add-onAvailable
TCPA AI disclosureBuilt-inEnforcedConfigurableManualManual
Call recordings & audit trailsAll plansAvailableAvailableAvailable
Role-based accessRBACIncludedEnterpriseEnterpriseNot available
Data residency / encryptionEncrypted at rest + in transitAvailableAvailableAvailable
Live dashboardEvery lead, every attemptReal-timeAvailableBasicAvailable
Call transcriptsAll plansAvailableAvailableAvailable
Connect rate analyticsPer lead sourceBasicBuild yourselfAvailable
Outcome trackingDispositionIncludedConfigurableManual setupPartial
AI call summary per callAutomaticAvailablePrompt-basedAvailable
Yes / built inPartial / with workNo

The ZEDNEX advantage

Three things no competitor offers together.

~200msvs 700–800ms on competitors

No pipeline, no latency

Rivals route every call through STT → LLM → TTS — three hops, three delays. ZEDNEX runs on an in-house audio-to-audio engine, hearing and replying directly, like a person.

15 minvs a dev sprint

Live in 15 minutes, no engineers

Competitors are built for developers — an API and a build week before you dial. ZEDNEX sets itself up on one call and is calling your leads before it ends.

$499a month, credits included, vs $0.05–$0.31/min + extras

One price, not four bills

Vapi bills platform, STT, TTS, LLM and telephony separately; Bland adds number and failed-call fees. ZEDNEX is one price with 1,000 calling credits built in.

Honest assessment

Where they beat us, in one line each.

Bland AI

Pick Bland if you have engineers and want it self-hosted.

  • Data stays on your servers
  • HIPAA and SOC 2 today
  • ~800ms slower replies
  • No follow-up sequence, no DNC built in
Vapi

Pick Vapi if you're building voice into your own product.

  • Open-source, any LLM or voice
  • Cheapest to experiment
  • Four or five vendor bills
  • No dashboard — API only
Retell AI

Pick Retell if you're in healthcare and need HIPAA now.

  • HIPAA, SOC 2, GDPR
  • 30+ languages out of the box
  • ~700–800ms replies
  • Needs developers to set up

Decision guide

Which one sounds like you?

Our pick

ZEDNEX AI

Every lead called in seconds and worked for five days. Live in 15 minutes, $499 a month, DNC built in.

Talk to our AI
Honest answer

Bland AI

Self-hosted, custom voice, deep control. Slower replies and more setup, but the data stays with you.

Honest answer

Vapi

Own every layer, bring any model, pay per minute. Expect to manage several vendors yourself.

Honest answer

Retell AI

HIPAA today, 30+ languages, built for regulated teams with developers on hand.

Still not sure?

Let the AI convince you.

Skip the research. Give us your number and a ZEDNEX agent calls you the way it would call your lead — so you can hear the difference yourself before you buy anything.

No forms after this. No sales deck. Just the call.