MSG91 vs Interakt: Which is Better in 2026?

The short answer

Interakt if WhatsApp is your shop window: cart recovery, catalog, ads. MSG91 if your app still dies when OTP SMS fails, and you want one wallet covering SMS, WhatsApp, voice, and email without a ₹5K/mo SaaS wrapper. Pick one; pretending both fit equally wastes GST invoices.

Where MSG91 actually wins

Cheap SMS at Indian scale isn’t a flex—it’s oxygen when one failed OTP costs you a ₹4,800 subscription renewal. MSG91 grew up as CPaaS first (Indore, 2008), so DLT headaches and transactional routes sit closer to the product skin than WA cosmetics.

That matters when RBI-ish flows mean OTP isn’t optional and WhatsApp is Layer Two.

• You’re pushing transactional SMS + OTP auto-read on Android alongside WA alerts—same prepaid wallet, same GST line item on recharge.
• BFSI / EdTech / logistics: lakh-scale SMS/day, promotional versus transactional separation, voice + IVR when escalation isn’t WhatsApp-shaped.
• Mid-market eng teams already integrated Razorpay webhooks and custom CRM glue; you’d rather REST docs than another inbox UI.

Counter-punch: The moment marketing owns revenue targets and Shopify owns inventory truth, MSG91’s WhatsApp surfaces feel unfinished—and you’ll resent explaining wallet top-ups to a growth lead who never ssh’d into anything.

Where Interakt actually wins

Interakt (Bengaluru, Haptik/Jio orbit) arrived when D2C brands stopped treating WhatsApp as a notification pipe and started running half the funnel there.

Abandoned cart isn’t a feature request you ticket.

• Shopify-native: catalog, cart, checkout-shaped messaging without your dev building a bespoke state machine on webhooks.
• Click-to-WA ads + segmentation without the team learning CPaaS dialect; shared inbox passes the “my intern can reply” test.
• No-code bot for FAQs and hours; good enough until you outgrow NLU budget.
• Broadcasts + drip when Black Friday isn’t a cron job—it’s a war room (and GST on the plan is still cheaper than rebuilding attribution).

Five bullets here because commerce surfaces genuinely justify line items.

MSG91 loses where nobody wants to read API pagination docs before launching a festive campaign—fair fight.

Pricing, in INR, no spin

MSG91: Usage-based, wallet prepaid. SMS ballpark ₹0.15–0.30/msg; WhatsApp = Meta conversation/rate card + ~₹0.10/msg platform fee (check current sheet; Meta moves). Free tier exists; true cost is recharges + GST on wallet and per-channel usage—no subscription floor, but finance chases wallet like a pet.

Interakt: Subscription. Starter ₹2,499/mo, Growth ₹5,499, Advanced ₹7,499—all plus Meta conversation charges separately. No free tier. GST on plans and on conversation billing. UPI payments line up with how Indian teams already pay SaaS.

Scenario (illustrative, round numbers):
D2C brand, ₹50L GMV/month, average order ₹1,200 → ~417 orders/month (low for ₹50L—so picture higher AOV or scale the GMV). Better: ₹50L GMV/month, AOV ₹2,500 → 2,000 orders. Say 40% touch WhatsApp pre-purchase/support, 25% need a billed conversation at ~₹0.40–₱0.90 blended (marketing vs service bucket—Meta’s 2024–2026 India rates shift by category). Rough: 800–1,000 billable conversations × ₹0.60 avg = ₹48,000–₹60,000/mo to Meta-class fees before platform. Interakt subscription ₹5,499–₹7,499 = ₹53,500–₹68,000/mo total ballpark ~₹65,000–₹1,15,000/mo** platform+Meta** depending on tier and campaign aggressiveness.

Same brand on MSG91 for mostly OTP + transactional SMS (assume 3 SMS/order blended promotional/transactional at ₹0.22): 2,000 orders × 3 × ₹0.22 = ₹1,320/mo SMS alone; add WA at Meta + ₹0.10: if 400 WA msgs × (Meta ~₹0.35 + ₹0.10) ≈ ₹180/400 sends if you simplify (real world: conversation buckets wreck naïve per-msg math—treat this as order-of-magnitude). Hidden costs either side: MSG91 wallet minimum recharge rhythm, possible sales-assist modules for advanced bits, engineer time to wire flows. Interakt: tier jump when seats or advanced automation hit, Meta’s 24-hour window surprises, Shopify app install and theme glue. Neither quotes settlement-cycle interest—Razorpay T+? days still hit your runway, not theirs.

If your problem is pure message cost at ₹2 cr/year GMV with mass SMS, MSG91’s lack of subscription floor wins on spreadsheet. If your problem is commerce conversion, Interakt’s ₹2,499 entry buys structures you won’t build for ₹4.5L in agency hours.

What we’d actually use each for

If you’re a 12-person D2C team on Shopify, ~₹40L MRR, two people full-time on performance and retention: Interakt. Abandoned cart, click-to-WA ads, catalog sync—inbox that doesn’t require a sprint. Book the MSG91 wallet only if you’re also fire-hosing OTP SMS outside app push.

If you’re a B2B SaaS with 18k MAU, login still SMS OTP-heavy post RBI tokenisation talk, and WhatsApp is for payment nudges and renewals: MSG91 as backbone, maybe a thin WA partner later. Your CFO already likes prepaid wallets for burn visibility.

Logistics scale-up with driver IVR + customer SMS + occasional WA proof of delivery: MSG91 end to end—Interakt isn’t built to be your voice switch.

Indian fit (GST, UPI, IST, support)

Both bill in INR, take UPI, and nod to GST on charges—wallet recharges (MSG91) and plans plus conversations (Interakt). IST support Mon–Sat 10–7 on both specs; nobody’s offering 2am IST white-glove without an enterprise line.

Neither is “foreign billing in USD pretending to be Indian” here—both pass the CA won’t shout test for standard SMB books. Where it frays: Meta’s own GST and conversation invoicing sits beside either platform—you’ll reconcile three ledgers some months (wallet, SaaS, Meta). Fun.

(Peace of mind isn’t vendor colour; it’s whether your finance team trusts the recharge email trail at audit.)

Migration: what’ll bite you

MSG91 → Interakt: You’ll rebuild broadcast lists—export depends on how you tagged users; CPaaS exports are often phone-number-centric, Interakt wants commerce events from Shopify/Woo. Webhooks differ: transactional payload shapes won’t drop into Interakt journeys unchanged. Bot flows: you’d rewrite in their builder. DLT templates tied to SMS routes don’t migrate to WhatsApp copy—fresh approvals on WA templates anyway.

Interakt → MSG91: Commerce UX disappears—your ops team inherits developer-facing tooling. Shopify deep links become your problem. Team inbox → ticketing discipline or third-party helpdesk. Conversation billing mental model swaps to wallet math—finance retrains. Contract-wise: annual SaaS locks hurt if you’re mid-quarter; MSG91 prepaid doesn’t forgive burnt credits either.

Either flip: budget two sprint-weeks minimum for integrations plus parallel-send testing so OTP traffic doesn’t ghost during cutover.

What we’d pick

We’d put Shopify-led revenue teams on Interakt until something breaks technically—and we’d put anything OTP-critical + multi-channel CPaaS on MSG91, accepting uglier marketer UX.

Still annoyed Meta bills conversations after RBI reminded everyone wallets aren’t toys—which stack hurts less when reconciliation month lands?

Things people ask

“Bro is MSG91 really cheaper if we do ₹2 cr/yr GMV?”
Depends where money moves. Heavy SMS + transactional volume: often yes, because no ₹30k–₹90k/yr SaaS floor. Heavy WA marketing with high conversation counts: Meta’s line can dwarf the difference—model it in a sheet, not vibes.

“Interakt Starter—can we run abandoned cart without Growth?”
Usually Starter handles core cart recovery paths; verify current plan limits on contacts and monthly conversation caps—vendors bump these. Expect GST on top.

“Do we need to redo GST templates if we switch?”
Invoice headers update in each vendor billing portal—your GSTIN stays yours. WA template approvals are Meta-side regardless of CPaaS skin.

“MSG91 wallet—what if finance hates prepaid?”
They hate surprises more—wallet is predictable burn. If purchase orders are mandatory, MSG91 enterprise sales path exists; adds friction Interakt subscription avoids.

“Does Interakt replace SMS OTP?”
No native SMS OTP fabric like MSG91—you’ll pair another SMS vendor or push WhatsApp OTP where acceptable (check user cohort comfort).

“UPI settlement vs WA charges—which hits cash flow?”
UPI settles fast-ish via gateways; Meta conversation bills monthly—different rhythm from wallet recharge. Cash-flow drag is usually marketing spike, not GST mechanics.

“IST support dead on Sunday outage?”
Both listed Mon–Sat—Sunday is pray to status pages or escalate if enterprise. Same pain either tool.

“RCA after we moved from AiSensy—Interakt worth the price jump?”
If Shopify revenue ops owns the ROI and you use catalog + campaigns daily, ₹2,499+ buys time. If you’re light on commerce, ₹5,499 stings—re-check AiSensy feature overlap first (not naming a winner—this is spend discipline).

“DLT tokenisation RBI talk—does either save us?”
Card tokenisation is issuer + PA world. Neither fixes that. Your SMS/WA vendors care about template compliance and delivery—stay on legal templates, separate concern.

The short answer

If your north star is selling on Shopify and rescuing carts in WhatsApp, buy Interakt and stop debating. If OTP SMS, DLT sanity, and one prepaid wallet for SMS + WhatsApp + voice + email are load-bearing for the product, MSG91 is the default—subscription UI polish be damned.

Where MSG91 actually wins

Engineers cheer when pricing is rupees-per-message and the word “campaign” refers to API calls, not a calendar view. MSG91 has been Indian CPaaS since 2008 (Indore), so the pain of high-volume SMS and messy routes is closer to the surface than glossy WA commerce chrome (which helps when your on-call cares more about delivery receipts than carousel templates).

You still need adults in the room for DLT template hygiene—no tool does that poetry for free.

• OTP + transactional SMS at scale: wallet top-up, GST on recharge and usage, typical SMS ₹0.15–0.30/msg ballpark—compare that to any “all-in-one” SaaS seat before you’ve sent a lakh texts in a Diwali surge.
• BFSI / EdTech / logistics: transactional + promotional lanes, voice/IVR when WhatsApp isn’t the escalation path, email API when marketing finally asks for drip (same vendor, different channel).
• Mid-market with real dev bandwidth: Razorpay + custom CRM + “we already have Grafana for this” stacks; REST beats wizards.

Loses badly when marketing wants Shopify catalog sync and a shared inbox that doesn’t look like a 2014 firewall admin panel—that’s when Indore feels far from Bengaluru.

Where Interakt actually wins

Commerce teams don’t wake up craving webhooks; they crave cart recovery numbers that survive a Monday stand-up. Interakt (2020, Bengaluru, Haptik/Jio orbit) is dressed for D2C: shared inbox, segmentation, broadcasts, drip, abandoned cart, click-to-WA ads, and WhatsApp-native cart/catalog/checkout flows—so the spreadsheet story matches the CRM story without a two-sprint integration death march (your intern can still mess up a template, but at least they won’t SSH).

• Shopify / WooCommerce depth: orders, catalog, checkout-shaped messaging—less custom glue than generic CPaaS.
• Pre-built abandonment and campaign paths versus “draw the rest of the owl” API work.
• No-code bot for FAQs and triage until you graduate to something serious.
• Performance marketing loop: CTWA ad management sits where acquisition already lives—handy when Meta bills more than your chai budget.
• SMB-friendly surface for teams new to WhatsApp Business API billing—Meta still stings separately, but you’re not translating wallet math for the full growth pod.

Five bullets because the product actually ships the D2C surface area, not just access to it.

Pricing, in INR, no spin

MSG91: Usage-based, wallet prepaid, free tier exists in principle. SMS commonly lands around ₹0.15–0.30/msg depending on route and volume. WhatsApp: Meta’s rate card + platform fee about ₹0.10/msg in the positioning (real life: conversation categories mangle per-message maths—budget with Meta’s line item, not napkin multiplication). GST on wallet recharges and per-channel usage. UPI-friendly. Hidden: minimum recharge rhythm, volume discount conversations, advanced bits sometimes needs sales, and always the engineering hours nobody books as “vendor cost.”

Interakt: No free tier. Starter ₹2,499/mo, Growth ₹5,499, Advanced ₹7,499—then Meta conversation charges on top. GST on plan + conversations. UPI-friendly. Hidden: tier jumps when seats or automation grows, reporting limits that nudge upgrades, and Meta’s 24-hour window + conversation buckets—your burn spikes when campaigns go viral.

Worked scenario (back-of-notebook, Indian numbering): Suppose ₹50,00,000 GMV/month, average ticket ₹2,500 ⇒ 2,000 orders/month. Assume 35% of buyers interact on WhatsApp before purchase and 40% of those sessions trigger billable Meta conversations once campaigns run hot—ballpark 280 conversation charges/month before spikes (marketing vs utility buckets shift averages wildly—this is sanity-check territory, not audit-grade).

If blended Meta-side conversation cost averages ₹0.65 (placeholder—pull live calculator), 280 × ₹0.65 ≈ ₹1,82,000/year Meta-class leakage alone (₹15,150/month). Add Growth ₹5,499 + GST (₹6,489 at 18%) ⇒ rough monthly stack ₹21,600–₹22,500 before you even argue about segmentation add-ons. On Starter, sub-₹2,499 + GST + same Meta pile—platform line is smaller; conversation line still dominates if you blast.

Contrast MSG91-style month: SMS for OTP + alerts—say 2.5 SMS/order at ₹0.22 ⇒ ₹11,000/month on SMS alone at that order volume; WhatsApp not one-line “per msg” if you run real conversation pricing through Meta—use their current India table. If you also push 400 high-intent WhatsApp utility messages off a simplistic model, costs follow Meta + platform markup, but you avoid a ₹2,499+ SaaS floor. Settlement-cycle point: neither vendor fixes Razorpay T+ working capital; watch cash when Meta bills monthly and wallet needs pre-funding before a sale day.

Who’s cheaper then? Heavy SMS / OTP fabric ⇒ MSG91 usually wins on fixed SaaS. Heavy WA commerce throughput ⇒ Interakt’s ₹24,990–₹89,988/year seat may be less than one lost week of engineer time—if you actually use catalogs, carts, inbox. Otherwise you’re subscribing to vibes.

What we’d actually use each for

12-person D2C, Shopify, ~₹40,00,000 MRR, two humans living inside ads and retention: Interakt—abandoned cart, catalog, team inbox. Park a ₹62,00,000 GMV/month nightmare in planning: if MDR + RTO already bleeds ₹1,23,400 style pain, solve conversion before haggling ₹0.10 platform fees—Meta will still invoice you like a polite monster.

B2B SaaS, 15k MAU, SMS OTP still sacred (tokenisation chatter or not—your users still fat-finger SMS): MSG91 core rails, maybe thin WA via same wallet. Your CFO likes prepaid visibility.

3PL with IVR + proof-of-delivery SMS + occasional WA proof images: MSG91 end to end—Interakt won’t run your voice story.

Indian fit (GST, UPI, IST, support)

Both: INR, UPI, GST on their invoices—MSG91 around wallet + usage, Interakt around plans + conversations. IST Mon–Sat 10–7 on paper for both (check before you sign—Sundays are “status page spirituality” territory). Neither is pretending US PT support for India pricing; foreigner billing [USD] isn’t the issue here—Meta USD/INR invoicing quirks sometimes are.

Annoyance layer: three trails to reconcile—your GST, vendor GST lines, Meta conversation invoices after 2024–2026 rate tweaks—same pain whether you chose Indore aesthetics or Bengaluru commerce chrome (RBI doesn’t WhatsApp your finance team mercy).

Migration: what’ll bite you

MSG91 → Interakt: Segmentation and journeys tied to CPaaS events don’t map 1:1 to Interakt commerce triggers—expect Shopify/Woo reinstall as source of truth. Webhook schemas change; retry policies differ. Template libraries aren’t portable—Meta approvals again. SMS-specific DLT wiring irrelevant to WA copy, but your SMS stays on MSG91 or moves vendor—dual-vendor bookkeeping. Wallet cash stranded if you prepaid big—classic sunk recharge trap.

Interakt → MSG91: Commerce UI evaporates—you inherit developer-first surfaces; Shopify flows become your integration debt. Click-to-WA ad operational knowledge must re-platform into Meta Business + tools. Team inbox habits collide with ticketing reality. Annual contract break fees on Interakt vs wallet lock-in on MSG91—pick your poison.

Either direction: parallel run, dual webhooks, gradual traffic shift—unless you enjoy Friday night 404 OTP stories.

What we’d pick

We’d standardise Interakt where Shopify GMV and WA cart data are already the system of record—pay the ₹2,499–₹7,499 lane that matches workflow, cry once about Meta. We’d standardise MSG91 where SMS + API + wallet economics and OTP SLAs beat another SaaS line you can’t defend in a ₹40,00,00,000 ARR board deck.

Honest itch: when GST e-invoice thresholds and UPI Lite adoption change how SMBs chase proof of purchase, does inbox-led support still deserve the same budget as payment recovery—or are we all just renting Meta’s mood anyway?

Things people ask

“Is MSG91 actually cheaper at ₹2 cr/yr GMV if 70% is SMS OTP?”
Usually yes on vendor subscription—you’re paying per message plus GST, not ₹30k–₹90k/year platform rent. Total cost still includes engineer time and Meta if WhatsApp scales; run a monthly model, not folklore.

“Interakt Starter vs Growth—will cart recovery break on Starter?”
Core recovery can live on Starter for many SMBs—limits on contacts, seats, automation depth bite first. Read the fine print on monthly active and conversation caps before you promise the board a number.

“Do I redo GST invoice mapping if I switch vendors?”
You update billing profile per vendor—GSTIN stays yours. Pain is operational, not constitutional. Meta conversation PDFs still arrive like a separate pen friend.

“MSG91 wallet—what if accounts hates prepaid?”
They’ll hate surprise Meta bills more; wallet forces forecasted burn. PO-based annuals exist at enterprise—slower procurement, same India GST story.

“Can Interakt replace MSG91 OTP SMS?”
Not as a drop-in SMS OTP network—you’ll still pair SMS CPaaS or accept WhatsApp OTP where users tolerate it (banking flows still lean SMS for many cohorts).

“₹50L GMV/month, 35% WA—ballpark Meta pain?”
Model conversation categories separately—marketing burns faster than utility; ₹0.65 average in a scenario above is illustrative only; pull Meta’s India calculator monthly (they change things when you’re asleep).

“IST support Saturday night sale—who picks up?”
Per SLA, expect business hours coverage; critical outages ride on vendor + Meta status pages. Enterprise contracts add named lanes—pay for them if Diwali is non-negotiable.

“RCS on MSG91—does Interakt care?”
Interakt isn’t pitching RCS + voice + SMS fabric—that’s MSG91-shaped. If RCS matters for your category pilot, CPaaS stays central.

“Migration weekend—biggest silent killer?”
Webhook idempotency and duplicate OTP sends during dual routing—watch retry storms harder than GST lines.

“Tokenisation noise—either fix OTP?”
Card tokenisation is issuer/processor theatre—SMS/WA vendors won’t rescue broken bank OTP policies; stay compliant on templates instead.

“Which one fails prettier when Shopify SKU sync breaks?”
Interakt surfaces commerce mismatch sooner for ops teams; MSG91 won’t babysit SKU truth—your catalog bugs remain yours like a stubborn rash.