For business officials

For district CFOs and business officials: a communications line item you can forecast

You cannot budget for a number you have to request. This page contains the whole price list, the assumptions behind the usage-variable portion, and a five-year model you can rebuild in a spreadsheet in four minutes.

Last reviewed 2026-08-04 ยท Kastr is pre-launch; we publish dated status rather than logos.

Five-year licence cost by enrolment, at the published bands
EnrolmentRateYr 1–3 (locked)Yr 4 worst caseYr 5 worst case5-year worst case
1,200$3.50$4,200 each$4,410$4,631$21,641
2,500$3.50$8,750 each$9,188$9,647$45,085
4,800$3.50$16,800 each$17,640$18,522$86,562
6,200$3.25$20,150 each$21,158$22,215$103,823
11,000$3.25$35,750 each$37,538$39,414$184,202
18,000$3.00$54,000 each$56,700$59,535$278,235
30,000$3.00$90,000 each$94,500$99,225$463,725

Worst case assumes the full 5% cap in years four and five; the contractual cap is the lesser of CPI-U or 5%, so at 2.5% inflation the real figures are lower. Licence only — SMS and voice usage is discussed below.

What is in the number and what is not

The per-student rate covers the platform: every feature, every user, every school in the district, unlimited staff seats, unlimited email, translation, the API, the CLI, support and onboarding. There is no implementation fee, no training fee, no premium tier and no module that unlocks later.

What sits outside the licence is telephony — SMS segments and voice minutes — because it is a genuine pass-through cost that varies with how much your district sends. Any vendor telling you SMS is unlimited and free is either bundling an estimate into your per-student rate or has a fair-use clause you have not read.

The composer shows a live per-channel dollar estimate before each send, priced at a deliberate one-cent-per-SMS upper bound. That means two things for your forecast: the in-product number is conservative, and the person incurring the cost sees it at the moment they incur it. That is the only cost control in this category that operates before the invoice.

Forecasting telephony before you have a year of data

Build it from send events rather than from message counts, because a single district-wide send fans out to thousands of segments.

  • Count your sends, not your messages. A typical district sends 2–5 district-wide messages a month, plus 4–10 building-level messages per school per month, plus attendance and operational traffic.
  • Multiply by reachable guardians, not students. Most students have between 1.3 and 1.9 contactable guardians. Using student count under-states your fan-out by a third.
  • Multiply by segments, not messages. A plain-text SMS carries 160 characters. A message with a curly apostrophe or an emoji drops to 70 characters per segment, so a two-line message can silently cost three times what you modelled. The SMS cost guide works through the boundaries.
  • Assume email is free and voice is not. Voice minutes are the expensive channel and the one that quietly grows when SMS delivery is poor, because failed texts fail over to voice.

A defensible first-year telephony line for a 5,000-student district is a range rather than a point estimate, and the honest way to present it to a board is as a range with the assumptions attached. Then measure the first semester and replace the estimate with your own data.

The renewal risk you are actually buying against

The pattern to model. A district signs at a defensible rate. Renewal arrives with a high-teens increase. Switching costs a summer of staff time nobody budgeted, so the increase is absorbed, and it happens again two years later. Compounded, that is where the money goes — not in the first-year quote every finance committee scrutinises.

The defence is a written cap. §3.2 fixes our rate for 36 months and limits year four onwards to the lesser of CPI-U or 5%. If you are evaluating other vendors, ask each of them to write their maximum annual increase into the agreement as a number. The ones that decline have told you something useful about the renewal you are signing up for, and it costs you nothing to ask.

The related question for your procurement office is auto-renewal. Note the notice window in your current agreement in your own calendar system, ninety days ahead of the deadline, today. The most common reason a district accepts an increase it did not want is that the window closed while the email sat unread. The renewal negotiation guide covers what to do when it has already landed.

Documents your procurement office will ask for

Everything below exists as a document rather than a promise, and none of it requires a call:

  • The published price list, per band, with no quote gate.
  • The master agreement, including §3.2 price lock, §7.1 export right, §9.4 non-solicitation and §11.2 change-of-control exit.
  • A data privacy agreement, and a sub-processor list. Being straight: our published sub-processor lists have been inconsistent across pages and we are reconciling them. Only Supabase, Resend and DeepL are actually wired into the running system today, and that is what a DPA conversation should be based on.
  • The architecture answers your technology director needs, on the technology director page.
  • A written statement of what we have not built, which is on the same page rather than omitted from it.

What we cannot supply: a SOC 2 report, a VPAT, an insurance certificate at enterprise limits, or customer references. We are pre-launch. If your purchasing policy makes any of those mandatory, we fail your process this cycle and it is better to know in week one.

Questions people actually ask

What is the price for a district of 6,200 students?

$3.25 per student per year, so $20,150 annually, fixed for 36 months by §3.2 — $60,450 across the initial term. From year four, increases are capped at the lesser of CPI-U or 5%, making the worst legal case $21,158 in year four. Telephony usage is separate and passed through.

Is there an implementation fee, a per-message fee, or a premium tier?

No to all three. One tier, every feature at every enrolment size, no onboarding or training charge, and no per-message platform fee. The only variable cost is carrier telephony — SMS segments and voice minutes — which is a genuine pass-through and is estimated in the composer before each send.

What is the worst-case price in year five?

Your locked rate compounded by 5% twice, because years one to three are fixed and years four and five are each capped at the lesser of CPI-U or 5%. For a 4,800-student district that is $18,522 in year five against $16,800 in year one, and the five-year total worst case is $86,562. If CPI-U runs below 5%, the cap binds lower.

How do we forecast SMS and voice usage before we have a year of data?

Estimate sends per month, multiply by contactable guardians rather than students — typically 1.3 to 1.9 per student — then multiply by expected segments per message, which is one per 160 plain characters and one per 70 if any non-GSM character is present. Present it to the board as a range with the assumptions listed, and replace it with measured data after one semester.

Can we pay from Title I or another restricted fund?

That depends on your state and the specific use, and we are not the right people to opine on your allowability determination. What we can do is give you a line-item description that a fund review can evaluate: a district-wide family communication platform licensed per enrolled student, with no family-facing charge and no advertising. Communications platforms are generally not E-rate eligible services, which surprises districts often enough to be worth stating.

One price. Every feature. Locked for three years.

$3.50 per student per year under 5,000 students. No tiers, no add-on modules, no per-message fees. Published on the site because you should not have to book a call to learn a price.