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Auto vs predictive vs progressive dialer: what's the difference?
"Auto dialer" is an umbrella term. Under it sit several real dialing modes — predictive, progressive, power and preview — and picking the right one decides how much your agents talk versus wait, and how many calls you can safely make.
The five modes, in one line each
- Preview — the agent sees the lead first, then clicks to dial. One call, full context.
- Progressive — the system dials the next number automatically the moment an agent is free. One call per agent, no waiting.
- Power — like progressive, often dialing a fixed number of lines per agent. Simple, predictable pacing.
- Predictive — dials several numbers per free agent using live statistics, so agents move straight from one live answer to the next.
- Auto dialer — the general term for any of the above that dials without the agent typing the number.
Progressive vs predictive — the real distinction
Progressive dialing places one call per available agent. There's never a connected call with no one to take it, so it's safe and compliant, but agents still wait through the ringing, busy tones and voicemails that don't connect.
Predictive dialing places more calls than there are free agents, betting on statistics — how many attempts connect, how long calls last — so that by the time a human answers, an agent has just come free. It maximises talk time, but it needs enough agents and volume to predict accurately, and it can occasionally "abandon" a call if it over-dials. For the full mechanics, see what a predictive dialer is.
Which one should you use?
- Small team, high-value calls → Preview. Preparation beats volume.
- Steady outbound, few agents → Progressive / power. Predictable, no abandoned calls.
- Large lists, many agents, short calls → Predictive. Highest connect-to-talk efficiency.
- Announcements / IVR blasts, no agents → Voice broadcast, not a dialer at all.
The best platforms let you choose the mode per campaign rather than locking you into one. Qallixo supports predictive, power, progressive and preview dialing side by side, with live call-rate limits and an enforced abandon-rate cap so predictive stays compliant.
Bottom line
Match the mode to the campaign: preview for care, progressive for safe steady dialing, predictive for volume. If you're evaluating platforms on this, our guide on how to choose call center software has a full checklist.