Two very different tools share the same core promise: send physical mail without touching a printer or visiting the post office. But WriteToMail and Lob are built for entirely different users — and choosing the wrong one wastes time, money, or both.
Lob is a developer-first API platform built for engineering teams at companies like Intuit, Lyft, and Salesforce. WriteToMail is a no-account, no-code tool built for individuals, law firms, and small businesses who need to send a letter in the next five minutes. That distinction shapes everything — pricing, setup time, features, and who should use each.
This comparison breaks down both services across every dimension that matters so you can make a fast, confident decision.
Quick Comparison: WriteToMail vs. Lob at a Glance
| Feature | WriteToMail | Lob |
|---|---|---|
| Target user | Individuals, law firms, small businesses | Developer teams, enterprise businesses |
| Account required | No | Yes |
| API required | No | Core functionality is API-driven |
| Pricing model | Pay-per-letter (starting ~$2.99) | Volume-based + monthly platform fee |
| Legal letter templates | Yes (cease and desist, demand letters, etc.) | No pre-built legal templates |
| HIPAA compliance | Yes | Yes (on higher-tier plans) |
| Bulk mail via CSV | Yes | Yes (via API or dashboard) |
| Certified mail | Yes | No |
| Setup time | Under 5 minutes | Days to weeks (API integration) |
| Mail carrier | USPS | USPS |
| Best for | One-off legal letters, small businesses, non-technical users | High-volume automated mailings, engineering teams |
WriteToMail: Built for People, Not Developers
WriteToMail does one thing exceptionally well: it removes every barrier between you and a physical letter in the mail. No account creation. No API keys. No graphic design software. You type your letter, enter the recipient's address, pay, and it ships via USPS — often the same business day.
Who Uses WriteToMail
The platform targets three groups specifically:
Individuals who need to send something important — a legal notice, a formal complaint, a certified letter to a landlord — and don't want to deal with printing, envelopes, and post office lines.
Law firms and solo attorneys who need to send client correspondence, demand letters, or cease and desist notices quickly without routing everything through a billing system.
Small business owners who need to send invoices, collection notices, or bulk outreach to customers and want a simple, repeatable process without hiring a developer.
Legal Templates That Actually Hold Up
One of WriteToMail's most practical advantages is its library of ready-to-use legal letter templates. Need to send a cease and desist? The template is already structured with the correct legal language — you customize the specifics and send. For anyone unfamiliar with how to send a cease and desist letter as a physical document with legal standing, this eliminates the most confusing part of the process.
Lob has no equivalent. It's a print-and-mail infrastructure layer — you bring your own content.
Bulk Mail Without the Technical Overhead
WriteToMail supports CSV uploads for bulk sending. Upload a spreadsheet, map your fields, write one template letter, and the platform personalizes and mails each one individually. For accounts receivable teams, property managers, or law firms sending collection notices to dozens of clients, this matters enormously. The bulk mail via CSV upload workflow takes minutes — not an engineering sprint.
Pricing: Transparent, Per-Letter
WriteToMail charges per letter sent. Pricing starts around $2.99 for a standard letter and scales based on page count and mail class. Certified mail is available at a higher price point. There are no monthly fees, no minimum volume requirements, and no surprises on the invoice.
For a small business sending 20–50 letters per month, this model is dramatically cheaper than Lob's platform fees.
HIPAA Compliance
WriteToMail is HIPAA-compliant, which matters for healthcare providers, therapists, and medical billing companies that need to send patient correspondence by mail. Sending a letter that includes Protected Health Information (PHI) through a non-compliant platform creates real legal exposure. WriteToMail's compliance removes that risk without requiring a separate Business Associate Agreement negotiation process.
Honest Limitations
WriteToMail isn't built for enterprise-scale automation. If you're sending 50,000 letters per month and need real-time delivery webhooks, campaign analytics dashboards, and deep API integration with your CRM, this tool isn't the right fit. It's optimized for speed and simplicity — which means it trades some of the power-user features that Lob offers.
Lob: Infrastructure for Engineering Teams
Lob is genuinely impressive engineering. Founded in 2013, the company has processed billions of pieces of mail and built one of the most reliable print-and-mail APIs available. Its customers include major financial institutions, healthcare companies, and tech platforms that need mail to function like any other software service — triggered automatically, tracked programmatically, and scaled to millions of pieces.
Who Uses Lob
Lob's core customer is a software engineer or growth team at a company with technical resources. Think: a fintech startup that automatically mails account statements, a healthcare company that triggers appointment reminders via USPS, or a real estate platform that mails postcards at scale based on user behavior.
If your use case involves automated, event-triggered mail tied to your own application logic, Lob is the right infrastructure.
API-First Design
Lob's entire value proposition is its API. You authenticate, write code that calls their endpoints, and physical mail gets sent as a programmatic output of your application. According to Lob's developer documentation, their API supports letters, postcards, checks, and self-mailers with response times and status webhooks that give engineers full visibility into the mailing pipeline.
This is enormously powerful. It's also completely inaccessible to someone who doesn't write code.
Pricing: Volume-Based, Not Transparent for Small Senders
Lob's pricing structure favors volume. They offer a free tier for testing (up to 300 API calls per month), but production pricing is tiered based on mail volume and plan type. Per-piece costs drop significantly at scale — Lob quotes starting prices around $0.87 per letter at high volumes — but smaller senders pay more and often owe a monthly platform fee on top of per-piece costs.
For a solo attorney sending 15 letters per month, Lob's pricing structure creates unnecessary overhead. For a company sending 100,000 pieces per month, it becomes cost-effective quickly.
No Legal Templates
Lob doesn't provide letter templates of any kind. It's a blank-slate infrastructure tool. You format the PDF, handle the content, manage the merge logic, and pass everything to the API. Legal professionals or individuals who need a demand letter template or a properly structured notice don't get any starting point from Lob.
HIPAA Compliance (With Caveats)
Lob offers HIPAA compliance, but it's gated to specific plan tiers. According to Lob's compliance documentation, a Business Associate Agreement (BAA) is available — but you need to be on an eligible paid plan and request it explicitly. This is standard for enterprise software, but it creates friction for smaller healthcare providers who just need to send a compliant letter without a lengthy sales process.
Honest Limitations
Lob requires technical investment upfront. The fastest path to a first mailing is still hours at minimum — you need to read documentation, generate API keys, write integration code or use their dashboard tools, and test your implementation. For non-technical users, that wall is prohibitive. Lob also doesn't offer certified mail, which rules it out for use cases requiring proof of delivery, such as legal notices.
Feature Deep-Dive: Where They Differ Most
Certified Mail
WriteToMail offers USPS Certified Mail with electronic return receipt. This creates a legally defensible record of delivery — essential for eviction notices, legal demands, debt collection compliance under the Fair Debt Collection Practices Act, and other time-sensitive legal correspondence. Lob does not offer certified mail.
Setup Time
A first-time WriteToMail user can send a letter in under 5 minutes. A first-time Lob user needs to create an account, read API documentation, write integration code, test in sandbox mode, and then switch to production. For a law firm that needs to send a demand letter today, only one of these is a viable option. If you want to understand the full process of sending a demand letter online without attorney overhead, WriteToMail's approach fits that workflow directly.
Template Library
WriteToMail includes legal letter templates for common use cases. Lob offers zero templates — content is entirely user-supplied.
Scalability
At 10,000+ pieces per month with programmatic triggers, Lob wins on cost and automation depth. Below that volume, WriteToMail wins on cost and convenience.
When to Choose WriteToMail
- You need to send a letter today, not after an API integration sprint
- Your use case involves legal correspondence (cease and desist, demand letters, eviction notices)
- You don't have a developer on staff — or don't want to involve one
- You need certified mail with proof of delivery
- You're a solo practitioner, small firm, or individual
- You want HIPAA compliance without a lengthy enterprise sales process
- You're sending fewer than a few thousand letters per month
When to Choose Lob
- You're a software engineer building mail into an application
- Your company sends tens of thousands of pieces per month
- You need automated, event-triggered mail tied to application logic
- Real-time webhooks and delivery tracking via API are requirements
- You have the technical resources to build and maintain an API integration
- Cost-per-piece at scale is your primary optimization target
Verdict: WriteToMail vs. Lob
For most individuals, law firms, and small businesses, WriteToMail is the right choice. It requires no technical knowledge, no account, and no commitment. You pay for what you send, get legal templates that actually help, and can send certified mail when the situation requires it. The time-to-first-letter is measured in minutes.
Lob is a better tool only when mail is a programmatic output of a software system — not when a human being needs to send a letter. If you're comparing other mail platforms as well, the upcoming WriteToMail vs. PostGrid comparison covers another API-heavy competitor through the same lens.
The question isn't which platform is more technically impressive. The question is which one gets your letter in the mail today, at a price that makes sense, with the legal structure your situation requires. For the overwhelming majority of readers comparing WriteToMail vs. Lob, that answer is WriteToMail.
Sources
Lob Developer Documentation — API structure, supported mail types, authentication, and response format details cited in the API-first design section
Lob Compliance Resources — HIPAA compliance plan requirements and BAA availability cited in the HIPAA section
FTC — Fair Debt Collection Practices Act — Statutory authority requiring certified mail for certain debt collection notices, cited in the Certified Mail section
Lob About / Company Background — Company founding date (2013) and enterprise customer context cited in the Lob overview section
WriteToMail — Cease and Desist Letter Guide — Internal resource on how to structure and mail a cease and desist letter without an attorney, linked in the legal templates section
