Comparison

Group SMS vs Kyanite Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Group SMS

Send the same message to multiple contacts simultaneously without individual copy-pasting. Create groups for efficient communication and save significant time when messaging several people at once.

Highlights
  • Create contact groups
  • Send one message to many
  • Time-saving utility
  • Efficient group communication
Features
Read full description

Group SMS makes it easy to send one text message to many people at once. Pick the contacts you want, write your message, and send to the whole group in seconds — no accounts, no sign-ups, nothing to learn. Whether it's holiday greetings, a party invite, a team update, or a quick reminder, Group SMS saves you from typing the same message over and over. WHAT YOU CAN DO • Pick your contacts — choose exactly who gets the message, then send to them all in one tap. • Save groups — create reusable groups like Family, Work, or Friends and reach them instantly. • Ready-made templates — dozens of polished messages for Christmas, New Year, Valentine's Day, Easter, birthdays, Mother's Day, Father's Day, and congratulations. • Write your own — type a custom message with a live character and SMS-segment counter. • Save any selection as a group, so it's ready next time. PRIVATE BY DESIGN Your messages are sent straight through your iPhone's own Messages app. There are no accounts, no servers, and no tracking. Your contacts and messages never leave your phone. SIMPLE AND FAST A clean, native design that feels right at home on iPhone. Open the app, pick a group, send.

About

Kyanite Pro

This app offers a suite of offline drilling calculators and reference tools for oil and gas professionals. It includes features for mud engineers, cementers, and directional drillers, with options to share data with crews. A free tier provides basic tools, while a subscription unlocks advanced calculators and job sheets.

Highlights
  • Offline drilling calculators
  • Mud, cement, and directional drilling tools
  • Field notes and reference charts
  • Crew data sharing
  • Kill sheet and cement job sheet
  • Chemical inventory management
Features
Read full description

A professional calculation and reference tool for the people who run the well: drilling and mud engineers, solids control hands, cementers, directional drillers and MWD hands. The calculators work completely offline. No ads and no tracking, and no account is needed to use them. You only sign in if you want to share records with your crew. FREE TO START The scientific calculator, field notes, reference charts, volume tables and the hitch calendar are free, along with the full calculator catalog so you can see what you are paying for. KYANITE PRO Unlocks the 130+ field calculators, kill sheets, cement job sheets, gain/loss sheets, LCM build sheets, location volumes and chemical inventory. Start with a 3-day free trial, then $3.99 per month or $19.99 per year. It all works with no signal. SHARE WITH YOUR CREW Keep one set of figures in front of everybody on location. Share tank gauge readings, chemical inventory, notes, LCM build sheets, kill sheets and cement jobs with the hands you work with, and every phone stays in step. Anything entered with no signal goes up when you have coverage, and your records stay private until you choose to share them. 130+ CALCULATORS Drilling engineering: capacities, volumes, string displacement, pump output and strokes, circulation times, hydrostatic, gradient, EMW, ECD, MAASP, lag time and ROP. Drilling fluids: mud weight conversions, oil/water ratio, weighted mixing, barite and hematite addition, dilution, PV, YP, gel strength, API fluid loss, retort solids and alkalinity. Solids control: solids percentage, low and high gravity solids, dilution and discard volume, screen mesh, centrifuge and hydrocyclone. Cementing: slurry yield and density, mix water, additives by percent BWOC, sacks, annular volume with hole excess, top of cement, balanced plug, displacement and strokes. Directional and MWD: minimum curvature, dogleg severity, interpolation, closure and vertical section, build and tangent sections, projections ahead, slide footage and toolface. Well control: formation pressure from SIDPP, kill mud weight, initial and final circulating pressure, the step-down schedule, maximum allowable mud weight from a leak-off test, MAASP, influx height and gas expansion. KILL SHEET A full IADC-style vertical well kill sheet you fill in before you need it. Keep the pre-recorded half current on a quiet tour; if the well is shut in, enter SIDPP, SICP and pit gain and the sheet works the kill with a full step-down schedule. CEMENT JOB SHEET Lay out a primary job end to end: capacities, coverage, barrels, sacks and mix water, the annulus drawn to scale, and a pump schedule with cumulative strokes. Casing presets from 20 to 4-1/2 inch. LCM BUILD SHEET Design a lost circulation pill product by product from your own inventory. Pounds, sacks, concentration and cost per barrel, a stock check against what is on hand, and one tap to record it as used. CHEMICAL INVENTORY A real daily ledger: previous, received, used, transferred in and out, and adjustments for every product, every day. Tomorrow starts where today finished and old days are never overwritten. BUILT FOR THE FIELD Large touch targets and big monospaced results, readable in gloves and in the sun. Dark and light mode, favorites and search. ENGINEERING INTEGRITY Every calculator shows its equation, units, assumptions and a verification status: VERIFIED, NEEDS VERIFICATION or EQUIPMENT SPECIFIC. IMPORTANT Kyanite Engineering is a calculation and reference aid, not a well control program and not a substitute for engineering judgement. All results must be verified by qualified personnel. Well control decisions must follow the operator's and contractor's program and the person in charge on location. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends. Terms: https://qd9gebwlsmhsi73ipf973-web-kyanite-support.rork.live/terms Privacy: https://qd9gebwlsmhsi73ipf973-web-kyanite-support.rork.live/privacy

Screenshots

Group SMS4 screens
Kyanite Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: Group SMS at none against Kyanite Pro's 2. Kyanite Pro's advantage is update cadence (every 5 days vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Kyanite Pro sells 2 in-app purchases, starting at $3.99 per month. Group SMS asks for nothing beyond the download.

UpkeepUpdate frequency

Group SMS ships an update every 6 months, Kyanite Pro every 5 days. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
Group SMS versus Kyanite Pro: the parameters behind the verdict, then further details
ParameterGroup SMSKyanite Pro
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews40.0% of reviews—
Number of ratings—1 — better
Update frequencyEvery 6 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size1 MB41 MB
Age rating4+4+
DeveloperBahtiyar PolatMike Haynes

Customer experience

Group SMS

Written reviews15 reviews
Positive40.0%
Neutral6.7%
Negative53.3%

Kyanite Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Group SMS

No in-app purchases

2 purchases

Kyanite Pro

Subscriptions2
  • Kyanite Pro Monthly3 Days trial$3.991 Month
  • Kyanite Pro Yearly$19.991 Year

Questions

Is Group SMS free?
Group SMS is free to download, with no in-app purchases.
Is Kyanite Pro free?
Kyanite Pro is free to download, with in-app purchases available.
Do Group SMS or Kyanite Pro have ads?
Neither Group SMS nor Kyanite Pro shows ads.
Which is updated more often, Group SMS or Kyanite Pro?
Group SMS ships an update every 6 months, and Kyanite Pro every 5 days. Most recently, Group SMS was updated on October 8, 2026 and Kyanite Pro on October 16, 2026.

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