LoopNow vs SendGrid for transactional email
SendGrid is a mature email API. LoopNow bundles transactional email with marketing, WhatsApp, voice and a consent ledger — and prices in INR.
One runtime vs point tool
LoopNow bundles email, WhatsApp, voice, workflow and GEO. If you only need one of those, the competitor may be cheaper.
| Criterion | LoopNow | SendGrid |
|---|---|---|
| Transactional API | Included | Core |
| Marketing email | Included | Separate product |
| Included | Not core | |
| Voice | 14 Indian languages | No |
| Billing | INR, GST, UPI | USD |
| Support | India hours | Global |
Competitor details checked 4 Nov 2026. Prices are exclusive of taxes; convert at ₹88/US$ where relevant.
We are not the right fit for everyone.
- You need a pure, highly mature transactional email API at global scale.
- You already have SendGrid deliverability tuned and audited.
- You do not need Indian billing or additional channels.
When LoopNow wins
You want one bill for email, WhatsApp, voice, workflow and GEO; Indian-language support; DPDP consent records; and AWS Mumbai residency.
Compare plans
The short version
- SendGrid is a mature transactional email API, and a pure sending API is a genuinely different job from running campaigns and journeys.
- LoopNow includes transactional email, marketing email, WhatsApp, voice and a consent ledger on one runtime, priced in INR with GST invoices.
- Our table records SendGrid as USD billed, global support, with marketing email as a separate product and WhatsApp not part of the core.
- If you have a tuned sending reputation, an engineering team that owns the integration and no need for Indian billing, keeping SendGrid is rational.
- This comparison is written by LoopNow, a participant. Competitor details were checked on 4 Nov 2026; prices change, so verify current rates with the vendor.
A transactional API is a different job from marketing
The word email covers two products that share a protocol and almost nothing else. A transactional API exists so that an application can deliver a password reset, an invoice, an OTP or a shipping notice within seconds of an event, with retries, queueing and a webhook that tells the application what happened. Marketing email exists so that a person can assemble a campaign, choose an audience, send it at a reasonable hour and read a report afterwards. One is infrastructure. The other is a workspace, and a product optimised for one is rarely optimised for the other.
SendGrid is the first kind, and our comparison table calls its transactional API the core of the product. That is a compliment with a boundary: if your need is a reliable HTTPS endpoint that accepts a message and reports delivery, a mature sending API with years of production traffic and an ecosystem of libraries around it is exactly the right purchase. The maturity shows in the unglamorous places, such as how the API behaves under retry pressure and how clearly the event webhooks describe a bounce.
LoopNow also exposes transactional sending, through an SMTP relay and a REST API, and bundles it with the campaign builder, WhatsApp, voice and the consent ledger. The argument for the bundle is that a receipt and a marketing message about the same order should read one suppression list. The argument against it is that a bundle is only worth its price if you use more than one part, which is the question this page is really about.
Deliverability engineering, not campaign craft
A sending API has one promise to keep: a message handed to it either reaches the receiving server or comes back with a reason. Everything else is instrumentation around that promise. Authentication records have to be right, the envelope sender has to align, transient failures have to be retried with backoff, and a hard bounce has to be recorded once rather than five times. A mature provider has seen every variant of this and has an operator on call when a receiving provider changes a filter on a Tuesday.
We run the same discipline on a smaller scale, with one structural difference that matters for compliance: the suppression ledger is shared with the campaign side, so a complaint on a marketing send blocks the transactional stream too, unless the block is deliberately scoped to marketing only. In a split stack, a receipt can arrive after a person has complained about a newsletter, because the two systems never spoke. It is a small failure with a large reputational cost, and it is the single strongest argument for putting both streams behind one ledger.
What a mature provider still does better is the long tail. Years of traffic produce edge cases that a newer platform meets for the first time in production: a receiving provider that greylists aggressively, a corporate gateway that rejects a valid message for a local policy reason, a sudden reputation hit from a shared pool. None of that appears in a feature comparison, and all of it appears in an incident review. If your sending is already clean and monitored, that accumulated knowledge is an asset worth keeping.
The two-vendor stack most teams end up with
A common Indian arrangement is a transactional provider for product mail and a marketing platform for campaigns, with a spreadsheet, a CRM sync or a hopeful integration holding the two together. It works until it does not. The failure modes are consistent: a suppression added in one system is unknown to the other, a contact is deleted from the CRM but remains active in both senders, and the monthly bill arrives as two invoices in two currencies with two different support contacts.
The alternative is one sending layer for both streams with separate subdomains for reputation. That is what we recommend inside LoopNow, and it is also possible inside a mature provider that offers both products. What matters is not the number of vendors but whether suppression, consent and identity are shared at send time. Two products from one vendor can still be two silos if the data does not flow between them, and one product with a shared ledger can cover both jobs if its API is good enough.
The question to ask in evaluation is therefore concrete: when a recipient presses spam on a campaign, how quickly does the transactional stream stop mailing them? If the answer involves a nightly job or a support ticket, the architecture has a gap regardless of which logo is on the invoice. If the answer is immediate and verifiable in a log, the stack is sound.
Cost per thousand and the GST line
Email looks cheap per message and becomes a real line item at volume. Our in-plan overage is ₹0.03 per delivered email and pay-as-you-go is ₹0.05, so a hundred thousand delivered emails beyond an allowance costs three thousand rupees inside a plan and five thousand outside it. Verification is metered separately at ₹0.35 per address because it is a different operation with a different cost, and a team that re-verifies a stale list every month spends more on hygiene than on sending.
The interesting arithmetic is the tier boundary. Starter includes twenty-five thousand emails at ₹2,999; adding seventy-five thousand at the overage rate brings the effective monthly cost to about ₹5,249. Growth includes a hundred thousand emails for ₹7,999. So buying up costs more than overage at that exact volume, and buying up is worth it once you also need the contacts, seats, agents and WhatsApp allowance that come with the higher tier. That is the calculation a buyer should run, rather than assuming the smallest plan is the cheapest.
SendGrid bills in USD, and we do not quote its per-thousand rate here because it changes and depends on the package. The point for an Indian buyer is that the rupee cost includes FX and card fees, and that a dollar invoice needs a different accounting treatment from a GST invoice. Compare landed cost per delivered message, and include the cost of the second tool you would need for campaigns if the sending API is all you buy.
Marketing email is a separate product for a reason
The split between transactional and marketing exists because the two streams have different consent rules, different failure tolerances and different reputations. A password reset is expected and must not be blocked by a marketing unsubscribe. A newsletter is discretionary and must be blocked by one. Putting them on the same subdomain means a marketing complaint drags down the deliverability of the receipts, which is why we recommend separate subdomains with separate DKIM keys even inside one platform.
When a vendor sells only the transactional half, the marketing half becomes somebody else’s product. That is not a flaw in the transactional product; it is a description of scope. The consequence is that a team buys two tools, learns two editors, reconciles two bills and maintains two suppression states. For a company with an engineering team that wants a clean API and a marketing team that already has a campaign tool, that arrangement is perfectly workable and often cheaper than consolidation.
Our view is that the split should be by stream, not by vendor. Use separate subdomains, separate authentication, separate reporting, and one ledger underneath. Whether the ledger belongs to one vendor or is assembled from two is an architectural choice with a real cost either way. The mistake is assuming that buying two products from two vendors automatically gives you separation, when what it often gives you is duplication.
Consent, suppression and the ledger gap
A transactional API typically accepts a suppression list as an input rather than owning it. That is the correct design for infrastructure: the application knows who the user is, and the API should not pretend to be a CRM. But it means the ledger lives wherever the application puts it, and in most companies that is a table maintained by an engineer who has eleven other things to do. It works until an unsubscribe is written to the table but not to the cache, or a hard bounce is recorded in the sending provider and never copied back.
Our ledger owns the record and enforces it at send time for both streams. Reasons include unsubscribe, hard bounce, complaint, manual block and erasure request, and the scope distinguishes a marketing suppression from a global one. Checks are synchronous rather than cached overnight, so a suppression added at 14:02 applies at 14:03. For a team without a platform engineer to maintain that table, the difference is a removed class of incident; for a team with one, it is a removed piece of undifferentiated work.
DPDP adds a second dimension. A suppression tells you not to send; a consent record tells you why you were allowed to send in the first place, and it has to survive a request for evidence. The ledger stores the notice version, purpose, channel, source and timestamp, and exports them. An application table rarely does, because it was designed to answer a different question.
Migration without losing the reputation you built
Moving a transactional stream is riskier than moving a campaign list, because the failure is immediate and visible: a password reset that does not arrive generates a support ticket within minutes. The sequence that works is to keep the old path live, mirror traffic to the new one for a small percentage, compare delivery events, and only then shift the remainder. A canary on transactional mail is not exotic; it is the same discipline you would apply to any dependent service.
The domain is the asset. Keep it, keep the subdomain, and publish the authentication records the new provider requires before any traffic moves. Do not delete the old records until the new ones verify as passing, and keep both providers configured to send for at least a week after cutover so a rollback is a configuration change rather than a project. Warm the new path even if the domain has history, because a new sending IP or pool starts with no reputation of its own.
The migration checklist that matters is short. Every template accounted for, every webhook endpoint tested against a real event, every suppression reason imported with its scope, every API key rotated rather than copied, and a rollback plan written down before the change window. If any of those is missing, the migration is not ready, no matter how well the demo went.
Support hours and incident handling
When a sending API fails at 2am, the question is who answers the phone. A global provider covers more time zones by default, which is an advantage for a company whose traffic peaks outside Indian business hours. An India-hours team is easier to reach during a Tuesday afternoon and slower at 3am on a Sunday. Neither is universally better; the right answer depends on when your traffic actually runs and whether you have an engineer on call who can work around a vendor.
Our support is in India hours on the standard plans, with 24/7 coverage and a named technical account manager on Scale. That is a claim about our staffing, not a comparison of response quality, and we would encourage a buyer to test it during evaluation by raising a real ticket rather than reading an SLA table. The most useful signal is whether the first responder understands the difference between a delivery delay and a suppression problem.
Escalation design matters as much as hours. A vendor with a status page, a documented incident process and a person who owns the relationship will resolve a bad night faster than a vendor with a generous SLA and no named contact. Ask both vendors what happened in their last significant incident and how customers were told. The answer tells you more than any commitment on a contract.
What developers actually need from a sending API
The list is short and unglamorous. A predictable JSON schema, idempotency keys so a retried request does not send twice, a sandbox mode that does not require a verified domain, webhook signatures so an endpoint cannot be spoofed, event retention long enough to debug an issue from last week, and clear error codes that distinguish a bad request from a suppressed recipient. Everything else is convenience. A product that gets these right is pleasant to integrate; one that gets them wrong costs an engineer a fortnight.
LoopNow exposes an SMTP relay and a REST API with signed webhooks, and the same suppression ledger the campaign side uses. Libraries exist for common runtimes, and the documentation is written to be read by a person at 11pm with a failing deploy. What we do not have is the breadth of third-party integration examples that a provider with years of public API traffic has accumulated, and an engineer who has integrated the other product before will notice that the first hour is slower with us.
Our advice to a developer-led team is to run the same integration test against both: send a message, force a bounce, retry a request with the same idempotency key, verify a webhook signature, and query the event for a message from three days ago. That test takes an afternoon and tells you more than a feature matrix. If both pass, choose on billing, channel coverage and who owns consent.
Fit test: when keeping SendGrid is the right call
Keep SendGrid if you have an engineering team that owns the integration, a sending reputation that took years to tune, and no requirement for Indian billing, WhatsApp or voice. Under those conditions the product is mature, the API is well understood by your team, and a migration would put production mail at risk for a benefit you would not use. Our own table lists that case first among the situations where the competitor wins.
Consider LoopNow if the transactional stream is only one part of a customer journey you are trying to join up, if the invoice needs to be in rupees with GST, or if the same team is already paying for WhatsApp and outbound calls somewhere else. The bundle is not cheaper because it is discounted; it is cheaper because you stop paying three vendors to maintain three copies of the same suppression list.
A middle path is common and worth naming: keep the mature API for high-volume product mail, and run campaigns, WhatsApp and voice on the runtime, with the ledger synced in one direction. It is more moving parts than either pure option, and for some teams it is the lowest-risk migration available. This comparison is written by LoopNow and we are a participant in it. Competitor details were checked on 4 Nov 2026, and prices change, so confirm the current position with SendGrid before deciding.
Frequently asked questions
Can LoopNow replace a transactional email API entirely?
For most product mail, yes: SMTP relay, REST API, retries, signed webhooks and a shared suppression ledger. What we do not have is the accumulated ecosystem of third-party integration examples that a mature provider offers. If your integration is unusual or your team depends on a specific library, test it before committing to a move.
Is a transactional API cheaper than a full platform?
Per message, usually yes, because you are buying infrastructure rather than a workspace. The total cost depends on what else you need. If you also buy a campaign tool, a WhatsApp tool and a calling vendor, the sum is often higher than a single plan that includes all four, and you carry the integration work yourself.
How do you price email overage?
₹0.03 per delivered email inside a plan and ₹0.05 pay-as-you-go, so overage never exceeds the standalone rate. Only delivered mail counts, which means a rejected message is not billed. Spend cap is on by default, with a choice of hard stop, queued backlog or automatic top-up.
What happens to suppression if I run two vendors?
You own the sync, and it will drift. A complaint recorded in one system has to be copied to the other before the next send, which usually means a job, a queue and an alert. If the sync fails silently, a person who complained receives another message, and the complaint escalates. One ledger with two outputs removes that class of failure.
Do you support separate subdomains for product and marketing mail?
Yes, and we recommend it. Each subdomain gets its own DKIM key and its own DMARC reporting, so a marketing complaint does not damage the reputation of password resets and invoices. Both subdomains read the same suppression ledger, so a global block still applies everywhere.
Can I keep my existing IP reputation?
The domain keeps its history, but a new sending path starts with no reputation of its own. Warm it with engaged volume before moving bulk traffic, and keep the old provider configured for a week so a rollback is a configuration change. Never delete authentication records until the new ones verify as passing.
How does support compare outside Indian hours?
Our standard plans cover India hours, with 24/7 support and a named technical account manager on Scale. A global provider covers more time zones by default. Which matters more depends on when your traffic peaks, so check the coverage against your own volume graph rather than the SLA table.
What does the free plan allow for transactional mail?
Five thousand emails a month, shared with marketing sends, plus one thousand marketing contacts, one hundred voice minutes and two hundred and fifty WhatsApp messages. It is enough to run a pilot on real traffic, though a production product stream will outgrow it quickly and should be planned against a paid tier.
Who should not move off SendGrid?
A team with a tuned reputation, an engineering owner for the integration and no need for Indian billing, WhatsApp or voice. In that case the migration risk is real and the benefit is theoretical. We would rather say that than put your password resets through an unnecessary cutover.