If you've been running keyword-and-list SMS campaigns for a while, you've probably looked at SlickText. It's a clean, well-known platform for the "text JOIN to 55555" style of marketing — keywords, sign-up funnels, drip messages, the whole list-building motion. For a lot of small senders, it's genuinely fine.
But the moment your monthly volume climbs into the tens of thousands of segments, the math starts to matter more than the polish. That's where this comparison lives.
Full disclosure: I work for ReadySMS, so I have a horse in this race. I'm going to try to keep this honest anyway — I'll tell you where SlickText is the better pick, and I won't quote you a competitor's exact prices, because those change and you should confirm them yourself on their site before you decide anything.
Where SlickText is genuinely good
Let me start with the parts I'd actually recommend.
SlickText built its reputation on keyword campaigns and list growth, and that's still its strongest suit. If your entire SMS strategy is "grow a subscriber list and send broadcasts," the on-ramp is smooth. The interface is friendly, the keyword setup is approachable for non-technical marketers, and the support reputation is solid.
It's also a reasonable fit if:
- You're a smaller sender who values hand-holding over per-text cost.
- You want an all-in-one list tool and don't need to plug SMS into a larger CRM or automation stack.
- Your monthly volume is low enough that the per-message rate barely moves your bill.
If that's you, you can probably stop reading. The friction of switching platforms isn't worth shaving fractions of a cent off a few thousand texts a month.
This comparison is for the other group: senders whose volume — or whose tooling needs — have outgrown the comfortable starter experience.
The per-text math at high volume
I won't print SlickText's prices here (confirm them on slicktext.com — they're tiered and they change). What I'll do instead is show you what ReadySMS costs, in full, so you can run your own comparison apples-to-apples.
ReadySMS charges per outbound segment, plus a flat $0.0045/segment carrier pass-through that's billed separately and not marked up:
| Tier | Volume / month | Per segment | + carrier | All-in |
|---|---|---|---|---|
| Starter | 0–50,000 | $0.0155 | $0.0045 | $0.0200 |
| Growth | 50,000–500,000 | $0.0125 | $0.0045 | $0.0170 |
| Enterprise | 500,000+ | $0.0028 | $0.0045 | $0.0073 |
The thing to understand before you compare anything: a "text" isn't always one segment. A plain message is 160 GSM-7 characters per segment. Go longer and it splits into 153-character chunks. Drop in a single emoji and the whole message becomes unicode, which cuts the limit to 70 characters per segment (67 for multipart).
So a 175-character promo with one emoji is 3 unicode segments. Send that to 5,000 contacts on the Starter tier:
`` 5,000 contacts × 3 segments × ($0.0155 + $0.0045) = 15,000 segments × $0.0200 = $300.00 ``
Same blast, no emoji, trimmed to 160 characters = 1 segment:
`` 5,000 × 1 × $0.0200 = $100.00 ``
That's a $200 difference on a single send, driven entirely by message length and one emoji — not by your platform choice. Any platform that quotes you "per message" is hiding this. Knowing the segment math is how you actually control the bill. If cost control is your reason for shopping around, our guide to reducing SMS costs goes deeper, and you can model your own volume on the calculator.
Done-for-you 10DLC and compliance
If you're sending keyword-and-list traffic in the US, you're sending over A2P 10DLC, and unregistered traffic gets carrier-filtered — meaning your messages quietly don't arrive. Most platforms make you deal with registration; the question is how much of it they own.
ReadySMS handles brand and campaign registration in-app: $35 one-time with a new number ($30 if you keep an existing one), then roughly ~$35/mo total in recurring carrier fees (brand + campaign + number), with approval typically landing in 4–7 business days. (Standard 10DLC is all most senders need — optional brand vetting at $40 or $100 one-time only matters if you're pushing higher daily throughput.)
On top of registration, the compliance stack runs automatically:
- Automatic STOP/opt-out handling — an inbound STOP propagates across campaigns so that contact can't be messaged again.
- Quiet-hours enforcement — sends are held outside permitted local hours based on the recipient's area, which trims TCPA exposure. (More on why this matters in SMS quiet hours.)
- Litigator / DNC scrubbing — known TCPA-litigator and DNC numbers can be screened before send. There's also a standalone scrub at $0.005/contact if you want to run it independently.
- Consent / attestation capture for bulk and API sends, building an audit trail.
None of this makes you immune to a lawsuit — compliance is always the sender's responsibility — but the difference between $0.005 to scrub a contact and the $500–$1,500 per-text exposure of a TCPA complaint is the kind of math that makes risk reduction cheap insurance.
Native GoHighLevel integration
This is the part where the comparison stops being about price.
If you run SMS through GoHighLevel — or you're an agency managing client sub-accounts — ReadySMS connects via OAuth with two-way sync, mapped per location. Inbound and outbound messages flow both directions, and each client stays isolated in their own sub-account. Replies land in the ReadySMS conversations inbox and in GHL.
SlickText is a standalone list platform; it isn't built around GHL the way ReadySMS is. If your contacts, automations, and pipelines live in GoHighLevel, that's a meaningful difference in day-to-day workflow — not a nice-to-have. Our GHL SMS setup guide walks through the connection, and if you're an agency specifically, how GHL agencies cut SMS costs is the more targeted read.
A built-in power dialer
Keyword campaigns build a list. But the highest-intent contacts on that list — the ones who just replied, or just opted in — often convert better with a phone call than another text. SlickText doesn't do outbound voice; ReadySMS does, in the same platform:
| Plan | Price | Agents | Minutes | Per-minute |
|---|---|---|---|---|
| Free | $0/mo | 1 | 500/mo included | $0.06/min after |
| Pro | $29/agent/mo | up to 3 | — | $0.05/min |
| Team | $69/agent/mo | unlimited | — | $0.0375/min |
The Power Dialer includes call recording, voicemail drop, transfer/barge/whisper, and — on Team — speed-to-lead auto-dial when a new lead comes in. Pairing an instant SMS with an auto-dial on fresh leads is the cleanest way to win the first-five-minutes race, and it's hard to do that when your texting and your calling live in two different tools.
So which one should you pick?
Here's the honest cut:
- Stay with SlickText if you're a smaller list-building sender, you value the friendly all-in-one experience, your volume is low enough that per-text cost is noise, and you don't need CRM/automation integration. It's a polished product for that job.
- Switch to ReadySMS if any of these are true:
- Your monthly volume is high enough that the per-segment rate moves real money.
- You run SMS through GoHighLevel and want native two-way sync.
- You want 10DLC and compliance handled in-app rather than as homework.
- You'd benefit from outbound calling alongside your texts.
- You want the carrier pass-through itemized so the bill is legible instead of bundled.
The low-risk way to find out is to test it on real traffic. ReadySMS gives you 20 free test sends to your own number, plus a $25 credit when you submit 10DLC registration — pay-as-you-go after that, with no monthly platform fee and no contract — enough to run a real keyword funnel and watch your actual segment counts before you commit real budget.
The practical takeaway
Platform comparisons get framed as "who's better," but the real question is "which one fits the job you're doing." SlickText is a good list-and-keyword tool for smaller senders who want it simple. ReadySMS earns the switch when volume, GoHighLevel, compliance overhead, or the need for voice tip the scales.
Before you decide either way: pull SlickText's current pricing from their own site, count the actual segments in your typical message (emoji and length included), and run both through the numbers. If you want to skip the spreadsheet, drop your volume into the calculator or just run your free test sends and that $25 registration credit through it and read the bill. The math will tell you what the marketing can't.