coss.com

coss.com vs Plivo

Plivo has voice, WhatsApp and short codes, sold through sales with a monthly commitment. coss.com is self-serve SMS next to email and Verify.

Plivo is a communications API with voice, SIP trunking and voice AI agents next to SMS, MMS and WhatsApp. Its SMS is provisioned by its sales team with a minimum monthly commitment, for businesses messaging under their own brand. coss.com does SMS only, on a self-serve plan, with US registration from one form and the same API key, webhooks and logs as email.

Read the docs

At a glance

Plivo's side was checked on against its own pages. Prices are list prices.

Featurecoss.comPlivo
Getting accessIts docs say self-service SMS onboarding isn't availableSelf-serve: live SMS on paid plans, which start at $25/month, all of it spendable on usageThrough sales, with a minimum monthly commitment across Plivo products: USD 1,000 for the US, Canada, UK, Australia, India (ILDO routes) and countries without pre-approval; USD 10,000 adds pre-registration countries
US price per segmentList pricesSMS (US): $0.0142 per segment; SMS (other countries): $0.022 to $0.1134 per segment, carrier fees included$0.0077 per SMS on long and short codes, $0.0079 on toll-free, sent or received, plus carrier surcharges of $0.0035 to $0.0050 per SMS sent; volume discounts through sales
Phone numbersSMS phone numbers (local): $1.15 per number-month; SMS phone numbers (toll-free): $2.15 per number-monthLong code $0.50 a month, toll-free $1 a month; US short code $1,500 to set up plus $500 a month
US carrier registrationcoss.com submits the 10DLC brand and campaign or the toll-free verification from one dashboard form; fees passed through at costYou create the profile, brand and campaign and link numbers in the console or API; toll-free verification in the console
ChannelsSMSSMS, MMS and WhatsApp through one Message API (WhatsApp on its Enterprise plan, from $1,000 a month)
Sender typesLocal and toll-free numbers (US, Canada)10DLC, toll-free, short codes and alphanumeric sender IDs
CountriesThe US and Canada by default; others once you allow them, from the priced list on coss.com/pricingOutbound to 200+ countries; inbound in the US, Canada, UK, Australia, France, Germany, Netherlands, Sweden, Austria and Belgium
Opt-outsSTOP suppresses the number in every live environment of the organization, START lifts itAutomatic on STOP and similar keywords, for that Plivo number or, on 10DLC, every number of the campaign
Voice—Voice API and SIP trunking; voice AI agents at $0.03 a minute excluding telephony
One-time codesVerify by SMS or email: $0.05 per verification, approved ones only, with a fraud guard before anything is sentVerify by SMS, voice or WhatsApp: no fee per verification, channel prices by country, Fraud Shield included; provisioned through sales
Multi-tenant platformsOne registration per organization; sub-accounts cover email onlyResellers, ISVs, aggregators and multi-tenant platforms aren't onboarded for SMS
CallbacksOne webhook endpoint for the sms.* events, with Standard Webhooks signaturesA callback URL per message, signed with HMAC-SHA256 in X-Plivo-Signature-V2 headers
TestingNot compared: see Plivo's docsSandbox keys simulate every message, with a simulator number for each outcome—
SDKsTypeScript, plus generated SDKs for Python, Go, Ruby, PHP, Java and .NET; Laravel, Rails and Django mail drivers; a CLI and an MCP serverPHP, Python, Node.js, Java, .NET, Ruby and Go
Also on the same API keyEmail, inboxes, Verify, Hooks, Risk, Forms, SignVoice, WhatsApp and Verify; no email on its pricing page

Which to choose

Both are good at what they do. Here is where each one fits better.

Choose Plivo when

  • You need voice

    Plivo has a voice API, SIP trunking and voice AI agents. coss.com has no voice product, and Verify doesn't make calls.

  • You need MMS or WhatsApp

    Both go through Plivo's Message API. coss.com sends SMS only: no MMS, no WhatsApp.

  • You need short codes or alphanumeric sender IDs

    Short codes or your brand name as the sender where countries allow it. coss.com sends from local and toll-free numbers.

  • You send and receive outside North America

    Plivo's inbound SMS covers the UK, Australia and several European countries. coss.com's numbers are US and Canadian, so messages elsewhere come from one of those and replies come back to it.

  • You can commit to volume

    With a monthly commitment you already plan to meet, Plivo's list prices and volume discounts can come in under coss.com's rate. Compare with your own traffic.

Choose coss.com when

  • No sales call or commitment

    Choose a paid plan, from $25/month, and spend its credit on usage. Plivo's docs list its smallest SMS commitment at USD 1,000 a month.

  • Registration from one form

    coss.com submits your business profile, brand, campaign or toll-free verification in order, shows each status and why a step was rejected, and passes the fees through at cost.

  • You only pay for what reached a carrier

    Failed, suppressed and canceled messages cost nothing, and carrier fees are in the rate rather than a separate surcharge per carrier.

  • SMS next to everything else

    The same API key, SDK, webhooks, logs and invoice as email, Verify and inboxes, and sandbox environments that simulate every outcome.

Moving from Plivo

  1. 1

    Get a number and register it

    There is no importer for Plivo: the dashboard's importer covers Resend, SendGrid and Postmark, and only email. On the organization's SMS page, buy a local or toll-free number and fill in the registration form with the business details you gave Plivo. Reviews usually take a few days.

    Read the guide
  2. 2

    Swap the send call

    Plivo's src, dst and text become coss.sms.send({ from, to, body }) with E.164 numbers. coss.com takes one recipient per call, so send separately where you joined several dst numbers. Test it first with a sandbox key and the simulator's numbers.

    Read the guide
  3. 3

    Move callbacks to webhooks

    Instead of a url per message, subscribe one webhook endpoint to the sms.* events. Replies go to the number's receiving environment and arrive as sms.received.

    Read the guide
  4. 4

    Carry over your opt-outs

    Opt-outs recorded at Plivo don't follow you. Add the numbers you must not text with coss.sms.suppressions.add() before your first live send.

    Read the guide

Questions

Is there an importer for Plivo?
No. The dashboard's importer covers email from Resend, SendGrid and Postmark. From Plivo, buy and register a number on coss.com, swap your send call, move callbacks to webhooks and add your opt-outs as suppressions.
Can coss.com make voice calls or send WhatsApp messages?
No. coss.com sends and receives SMS only, with no voice, MMS or WhatsApp. Plivo has all three.
Do I need a monthly commitment for SMS on coss.com?
No more than a paid plan, whose fee is credit spent on usage. Numbers and US carrier registration fees are billed on the same invoice. See coss.com/pricing.
Does coss.com register my numbers for A2P 10DLC?
Yes. Owners and admins fill in one form on the organization's SMS page, and coss.com submits the business profile, brand and campaign (or the toll-free verification) and passes the carrier fees through at cost.
Which provider sends coss.com's SMS?
Twilio, with one subaccount per organization. coss.com handles the numbers, the registration, opt-outs, billing and webhooks around it.

Sources

Plivo's facts were checked on ; their pages are the final word on their prices and features.

The coss.com side

Try coss.com next to Plivo.

A development key costs nothing and delivers nothing, so you can compare with real code.

Add coss.com to this project: read https://coss.com/llms.txt, get a development key with `npx coss-cli init --agents`, and build and test with it.

Pricing