LetterStream vs PostGrid
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Both sides assessedLetterStream compared with PostGrid
PostGrid is cheaper on ordinary letters at $0.827 Standard Class, has a far better API, and matches LetterStream on HIPAA coverage while adding cheque printing and a CASS and NCOA product. LetterStream answers with Certified Mail, Electronic Return Receipt, FedEx signature confirmation, and no subscription at all. Choose PostGrid for programmatic transactional mail; choose LetterStream when a piece has to be provably served.
PostGrid compared with LetterStream
LetterStream is the specialist for legally significant mail, with Certified Mail from $8.63 and FedEx options, no monthly fee, and no minimum. PostGrid is broader, more programmable, and cheaper on ordinary letters at $0.827 Standard. Send your demand letters and certified notices through LetterStream; run your transactional and marketing volume through PostGrid.
Choose LetterStream if
Any small business, law firm, property manager, HR team, or collections operation that needs Certified Mail with documented proof of delivery, and anyone who wants occasional letters printed and posted without a subscription, a minimum, or a marketing platform attached.
Choose PostGrid if
Developer-led teams in healthcare, insurance, fintech, and B2B SaaS that need compliant transactional mail triggered by application events, and any small business whose real problem is a dirty address list rather than a print vendor.
Side by side
13 attributes| Attribute | LetterStream | PostGrid |
|---|---|---|
| Category | Gifting | Gifting |
| Starting price | $0 per month, with Express postcards from $0.91 and First-Class letters from $1.27 (free plan available) | $0 per month with 4x6 postcards at $0.902 each (free plan available) |
| Pricing model | Pure pay-per-piece with a free account, no monthly fee, and no minimum quantity. Base rates include printing, envelope insertion, and postage; every enhancement is priced separately per piece. | Free platform plan plus per-piece pricing with printing and postage included. Address verification is a separately priced product. Above 500 mailings a month there is no published tier, only a quoted Enterprise plan. |
| Free plan | The account itself is free with no monthly fee, no minimum quantity, and no commitment. There is no subscription tier of any kind. | Starter: $0 per month, one user, ten templates, a single delivery network, and up to 500 mailings per month at standard per-piece rates. |
| Free trial | No trial needed; the account is free and you pay only for the mail you send | No time-limited trial; the free Starter plan is the evaluation path and is usable in production |
| Best for | Any small business, law firm, property manager, HR team, or collections operation that needs Certified Mail with documented proof of delivery, and anyone who wants occasional letters printed and posted without a subscription, a minimum, or a marketing platform attached. | Developer-led teams in healthcare, insurance, fintech, and B2B SaaS that need compliant transactional mail triggered by application events, and any small business whose real problem is a dirty address list rather than a print vendor. |
| Setup time | Under thirty minutes for a first job. Create a free account, upload a document and an address list, choose a mail class and options, and submit. API integration takes a developer a day or so using the published sample code. | An afternoon for a developer to get a test postcard rendering and a live one in the mail. Longer if you are also cleaning a list, because bulk verification and NCOA on a large file is the step that actually takes days. |
| Learning curve | Low for the web workflow and moderate for the postal specifics. The parts worth understanding are what Certified Mail with and without a return receipt actually proves, how extra ounces are triggered by return envelopes and page counts, and when the 3pm Arizona cutoff applies to your deadline. | Moderate and front-loaded. The API itself is conventional REST and reads quickly. The genuinely unfamiliar parts are postal ones: mail class selection, presort eligibility, what CASS certification does and does not guarantee, and why a technically valid address can still be undeliverable. |
| Platforms | Web application, Mailing API, Document and list upload, Rush processing path | Web dashboard, REST API, Language SDKs, Bulk CSV upload, Webhooks |
| Compliance | HIPAA certified, USPS CASS and NCOA processing, BBB A plus accredited | SOC 2, HIPAA, PHIPA, PIPEDA, GDPR, USPS CASS certified |
| Founded | 2003 | 2020 |
| Headquarters | Scottsdale, Arizona | Boston, Massachusetts, with Canadian origins in Toronto and operations across the USA, Canada, the UK, and Australia |
| Ownership | Privately held, led by president and chief executive David Patterson | Privately held |
Strengths and limitations
LetterStream
Strengths
- Certified Mail with Electronic Return Receipt and FedEx 2Day with signature confirmation, which is the legally usable proof of delivery no other vendor in this category offers.
- No monthly fee, no minimum, and no commitment of any kind, so an account that sends twelve pieces a month costs nothing but the twelve pieces.
- Real CASS and NCOA address cleanup as a list service, which is proper postal hygiene rather than a validation checkbox.
- HIPAA certification, allowing patient statements and health notices to route through the platform when most marketing mail vendors cannot touch them.
Limitations
- No marketing layer at all. No campaign builder, no drip triggers, no CRM integrations, no personalized URLs, no QR code tracking, and no attribution reporting.
- Per-piece rates for ordinary mail are roughly double the programmatic platforms, so any marketing volume routed here is overpaying substantially.
- Standard First-Class mail has no tracking, so unless you pay for Certified or FedEx you cannot prove anything about a specific piece.
- The add-on model means the headline rate understates a realistic job. Colour, extra pages, return envelopes, and extra ounces stack quickly.
PostGrid
Strengths
- Address verification is a real product rather than a checkbox: CASS certified, NCOA, delivery point validation, residential flagging, geocoding, and 250-plus country coverage, which directly attacks the largest source of waste in direct mail.
- The free Starter plan is a usable production plan with the full API, not a crippled demo, and 500 mailings a month covers a genuine small-business transactional programme.
- Compliance breadth is unusual for a self-serve product: HIPAA, PHIPA, PIPEDA, GDPR, and SOC 2 make it viable for healthcare and financial notices that most marketing-first mail vendors cannot touch.
- Three independent attribution signals, carrier tracking plus personalized QR codes plus pURLs, which is more resolution than most competitors offer.
Limitations
- The pricing ladder has a hole in it. Free up to 500 pieces a month, then nothing published until Enterprise, so the exact moment your programme starts working is the moment you enter a sales cycle.
- International postage is not published at all, which makes any cross-border programme unmodellable from the outside despite the excellent international address coverage.
- The product is written for developers. The dashboard exists but the documentation, the template model, and the error surface all assume someone comfortable with HTML and HTTP.
- No gifting capability whatsoever, which matters because buyers arrive at this category wanting one vendor for both jobs and PostGrid does exactly half of it.
Pricing compared
LetterStream
Pure pay-per-piece with a free account, no monthly fee, and no minimum quantity. Base rates include printing, envelope insertion, and postage; every enhancement is priced separately per piece.
- Free account, pay per piece$0
For marketing mail, LetterStream is poor value: $1.27 a letter and $1.30 a Pro postcard is roughly double what Poplar or Lob charge for a comparable piece, and there is no campaign layer to justify it. For legally significant mail it is excellent value and effectively uncontested in this category. Certified Mail with Electronic Return Receipt at $8.63 replaces a person, a queue, a green card, and a filing cabinet, and the free account with no minimum means a firm sending twelve notices a month pays nothing but the postage. The lesson most buyers should take is that this is a second vendor rather than a first one: run your campaign volume somewhere cheap and route the pieces that have to hold up in a dispute through here.
PostGrid
Free platform plan plus per-piece pricing with printing and postage included. Address verification is a separately priced product. Above 500 mailings a month there is no published tier, only a quoted Enterprise plan.
- Starter$0
- EnterpriseCustom
For a small business the free Starter plan is close to unbeatable: a production-grade mail API with test environments, HIPAA coverage, and CASS verification for no subscription, at $0.902 a postcard with postage in the price. Against a local print shop the comparison is not really about unit cost, which will be similar at a few hundred pieces, it is that the print shop cannot be triggered by a webhook and will not tell you whether piece 143 was delivered. The value falls apart at the transition point. A business sending 3,000 pieces a month has outgrown the free tier and has no published rate to grow into, which is where competitors with real middle tiers win on procurement friction alone.
Editorial verdict on each
LetterStream
LetterStream is the specialist you hold an account with rather than the platform you run your programme on. For marketing mail it is roughly double the price of the programmatic platforms with none of the campaign tooling, and nobody should route campaign volume through it. For anything that has to be provably served, it is close to uncontested in this category: Certified Mail with Electronic Return Receipt, FedEx signature confirmation, real CASS and NCOA cleanup, HIPAA certification, a published two business day guarantee, and a free account with no subscription and no minimum. Law firms, property managers, collections operations, medical practices, and membership organisations should open an account today, because it costs nothing until you use it. Everyone else should pair it with a cheap programmatic vendor and use each for the job it is actually good at.
Read the full LetterStream profilePostGrid
PostGrid is the direct mail API you pick when the address list is the problem. The verification and NCOA layer is the best in this category, the compliance coverage opens healthcare and financial work that marketing-first vendors cannot take, and the free Starter plan is a genuinely usable production plan rather than a trial, which makes it one of the cheapest ways for a small business to start mailing programmatically. The weakness is commercial, not technical: there is no published tier between 500 pieces a month and an Enterprise quote, and no published international postage at all, so the platform is easiest to adopt and hardest to grow into. Start here if you are technical, US or Canadian, and mailing something that has to arrive. Look at Lob or Stannp if you want to see your price at 50,000 pieces before you write any code.
Read the full PostGrid profileLetterStream profile last reviewed 2026-08-22; PostGrid last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.