One of these is hours. One of these is software.
An ISA desk is people making calls. It is the incumbent solution to this problem and for some books it is the right one. Here is the honest split.
What an ISA actually gives you
A human being who can hear hesitation, handle an objection they have not seen before, and pick up a phone at the moment somebody is thinking about it. That is not a small thing and no amount of software replaces it.
What it costs is not only money. It is hiring, ramp, scripts, QA, and the fact that the good ones leave, and every one of those costs is paid again for the next person.
Side by side
One row per thing an agent actually asks about.
| Lewis | An ISA desk | |
|---|---|---|
| Channel | Text. Answered when the lead feels like it | Phone, mostly. Answered when they pick up |
| Ramp time | One import | Weeks, per hire |
| Consistency | Identical on the four hundredth conversation as on the first | Depends who is on shift |
| Fair-housing risk | Blocked mechanically on every outbound message | Managed by training and QA |
| Record of what was said | Every message, plus an append-only log of every decision and refusal | Call recordings, where they are kept |
| Handles an objection nobody scripted | No. It escalates to you | Yes, usually |
| Cost shape | Per agent per month, flat | Per hour or per appointment, and it scales with volume |
| Who signs off on a message | You, on every draft | The ISA, usually, within a script |
Everything below about Lewis is checkable in this product. Everything about the other side is a description of the CATEGORY it belongs to, not a claim about its internals. For anything specific, and for current pricing, read their own documentation. If something here is out of date or unfair, tell us and it gets fixed.
Where Lewis wins
The dead list. Four hundred contacts that need one specific question each is exactly the work a person will not do consistently at hour six, and exactly the work that does not require judgement: most of those conversations end in “no” or silence, and the value is in reaching all of them rather than in handling any one of them well.
Text also beats a call for a cold reactivation, for an unglamorous reason: a call from an unknown number in the middle of a workday is an imposition, and a text is not.
Where an ISA wins
Live, warm, and complicated. Somebody who is halfway to a decision and has three worries about it needs a person, and needs one now. Lewis is built to hand that conversation over at exactly the point it appears, which means an ISA desk and Lewis are not really competing for the same conversation.
The comparison nobody makes
An ISA desk that is working your dormant list is an ISA desk not working your live leads. Whatever hours you buy, they are finite, and they get spent on the top of the pile. The bottom of the pile is where the four hundred names are.
Using both
This is the pairing that makes the most sense of any on the site. Lewis works the dormant list and hands over anything warm; the ISA takes the handovers and the live leads, and stops spending their afternoon on people who moved two years ago.
Other comparisons
- Lewis vs a CRM dripThe same sentence to four hundred people, versus the thing that person told you.
- Lewis vs doing it yourselfThe honest version: you are better at this than Lewis. You are not going to do it.
- Lewis vs StructurelyTwo conversational-AI products, and where the approval model differs.
- Lewis vs YlopoA full marketing stack, next to one job done carefully.
- Lewis vs Follow Up BossA CRM is where the leads live. Lewis is what works them.
- Lewis vs LoftyAn all-in-one platform, next to a tool you point at its export.