power
One rep, one line.
Calls one number at a time and dials the next for you when the call ends. You hear every ring, and nobody else is on the phone.
Parallel vs power vs predictive: three dialers, three jobs.
A power dialer calls one number at a time, a parallel dialer calls several at once for one rep, and a predictive dialer dials ahead for a room of agents. Five at a Time covers the first two: one to 5 lines for $150 a seat a month, with one seat as the minimum.
parallel
One rep, several lines.
Calls several numbers at once for one rep and connects that rep to the first person who answers. The lines still ringing are hung up.
predictive
Many agents, an algorithm, many lines.
Dials ahead for a pool of agents. An algorithm places more calls than there are free agents and routes each answer to whoever is free. Built for call centres.
What each one does on a call
A power dialer takes the dialing off your hands and nothing else. You finish a call, it dials the next lead, and you listen to it ring. If a voicemail answers, you hear it. If a person answers, you were already there. It is the slowest of the three and the only one where nobody is ever called without a rep waiting for them.
A parallel dialer calls a handful of leads at the same moment for one rep. Most of those calls reach nobody, which is the point: the ringing that a power dialer makes you sit through one call at a time happens all at once. When a person answers, the rep is on that call and the rest are ended. What is a parallel dialer? has the arithmetic.
A predictive dialer does not belong to a rep at all. It serves a pool of agents working one campaign. An algorithm estimates how long calls are running and how many dials it takes to reach a person, then places calls before any agent is free, betting that one will be by the time someone picks up. When the bet is wrong, a person answers and there is nobody for them. That is the classic source of abandoned calls.
Side by side
| Power | Parallel | Predictive | |
|---|---|---|---|
| Lines per rep | One | Several, usually 2 to 5, all for the same rep | Not counted per rep. The system decides how many calls to place for the whole pool |
| Who it is for | One rep working a list in order | One rep, or a team of reps who each run their own lines | A pool of agents on one campaign |
| Who gets the answered call | The rep who was listening to it ring | The same rep, on whichever line answers first | Whichever agent is free |
| What the person called experiences | A normal call | A normal call if they answer first. A missed call if they were still ringing. If they answer second, whatever the product plays | A normal call if an agent is free. If none is, a wait, a recording or a hang-up |
| Exposure to abandoned calls | None from the dialer. One call, one rep | Some. Only when two people answer in the same batch, which grows with lines and with how often the list picks up | The most of the three. Dialing ahead of free agents is how it works |
| The list it suits | Warm leads, callbacks, small lists, lists that pick up often | Cold lists where most dials reach nobody | Very large lists worked by many agents |
| Typical buyer | A solo rep, a small team, account managers | An SDR or an SDR team doing cold outbound | A call centre |
These describe each kind of dialer in general, not any one product. Five at a Time is a parallel dialer with a one-line mode. How ours works.
Stay on a power dialer if any of these is you.
We sell a parallel dialer and we are telling you this anyway. One line is the right answer for a lot of callers.
- Your list picks up often.The more people answer, the more often two answer in the same round, and one of them gets hung up on. The sum is here.
- The people you call are expecting you.Callbacks, inbound leads, customers, renewals. There is no ring time worth saving on a call someone asked for.
- Your list is small.If you can get through it on one line in a day, several lines only get you to the end of it sooner.
- You read up on each lead before they answer.On one line the ring is your time to look at who you are calling. On five you find out who it is when they say hello.
- You call consumers, or you have not read the rules yet.One call for one rep cannot leave anyone on the line without a rep. Is parallel dialing legal?
- You make a few dozen calls a day.What a parallel dialer saves is ring time, and at that volume there is not much of it.
The rule predictive dialers are tuned to
This is the part of the comparison with law in it. It is a summary with sources, not legal advice.
2seconds after the greeting ends
The FTC’s Telemarketing Sales Rule calls a call abandoned when a person answers and is not connected to a sales representative within two seconds of finishing their greeting[1]. Its safe harbor allows no more than 3% of calls answered by a person to be abandoned, measured per campaign over 30 days, and asks the caller to let the phone ring 15 seconds or four rings, to play a recorded message with the seller’s name and number when no rep is available, and to keep records[1]. On calls the rule covers, that 3% is the ceiling a predictive dialer has to be paced under.
The same rule exempts calls between a telemarketer and a business, with exceptions[2]. The FCC has abandoned-call rules of its own[3], and whether they reach a given business call is less settled. Vendors also disagree about whether the second person to answer a parallel batch counts as an abandoned call. We do not resolve that here. Read the rules and their sources, and check each state you call.
On Five at a Time, a second person who answers hears a short automated apology and the call ends. Calling pauses for 30 minutes when many people have been hung up on. That hold protects the phone numbers and the carrier account. It is not designed to keep you inside any abandoned-call rule, which stays your job as the caller.
Questions
What is the difference between a power dialer and a parallel dialer?
A power dialer calls one number at a time and dials the next when the call ends. A parallel dialer calls several numbers at once for the same rep and connects the rep to the first person who answers. Power means you hear every ring. Parallel means the rings happen at the same time and some people get hung up on.
What is the difference between a parallel dialer and a predictive dialer?
A parallel dialer works for one rep: several lines, and that rep takes whoever answers first. A predictive dialer works for a pool of agents: an algorithm dials ahead of them and sends each answered call to whichever agent is free. Predictive dialers are built for call centres.
When should I stay on a power dialer?
When your list picks up often, when the people you call are expecting you, when the list is small, when you call consumers, or when you want the ring time to read up on each lead. In each case the time a parallel dialer saves is small and the cost of hanging up on someone is not.
Can a parallel dialer work as a power dialer?
If it lets you run one line. Five at a Time has a solo mode that calls one number at a time, plus double, triple and five-line modes. You pick the mode before each session.
Which kind of dialer has the most abandoned calls?
Predictive, as a kind. It places more calls than there are free agents and sometimes a person answers with nobody to take the call. A parallel dialer can only leave someone without a rep when two people answer in the same batch. A power dialer places one call for one rep.
Is there a free power dialer?
DialSheet, which we also make, is free for one person: 500 calls a month and 500 leads on your own Twilio account, as of November 2026. We make both products, so weigh that.
Does a small sales team need a predictive dialer?
No. A predictive dialer needs a pool of agents on the same campaign to route calls to, and someone watching its abandoned-call rate. A team of a few reps doing cold outbound is the buyer a parallel dialer is built for.
Sources
- FTC Telemarketing Sales Rule, 16 CFR 310.4. Abandoned calls, 310.4(b)(1)(iv), and the safe harbor, 310.4(b)(4). Read November 13, 2026.
- FTC Telemarketing Sales Rule, 16 CFR 310.6. The exemption for calls to businesses, 310.6(b)(7), and its limits. Read November 13, 2026.
- FCC, 47 CFR 64.1200. The FCC’s abandoned-call rules, 64.1200(a)(6) and (a)(7). Read November 13, 2026.
- DialSheet, pricing page. Read November 10, 2026.
- PhoneBurner, pricing page. Read November 13, 2026.
Other companies change their prices and plans without telling us. If something here is out of date, tell us and we will fix it.
one at a time is for people with time.
10 conversations or one day on five lines, free. You add a card and we check your business before the first call. After the trial your plan starts on that card at $150 a seat a month unless you cancel.
Start free trialSee pricing or read the refund policy first.