Tools · Comparison

Devin vs Mails.ai vs Userdoc

All three are code assistant tools. Here is what separates them.

	Devin	Mails.ai	Userdoc
What it is	An autonomous software engineer that takes a ticket, works in its own environment, and opens a pull request.	Self-serve AI email API + MCP for agents. Per-agent addresses, per-agent reputation, native prompt-injection scanning on every inbound.	Whether it's new software projects, existing platforms, or legacy systems, Userdoc's advanced AI streamlines what needs to be built and uncovers…
Category	Code Assistant	Code Assistant	Code Assistant
Pricing	Paid · From $20/mo (usage-based)	Freemium · $15 - $149/mo	Free · Free
How it bills	Usage-based	Flat monthly	Free
Free tier	No	Yes	Yes
Rating	Not yet rated	Not yet rated	Not yet rated
Features	Own sandboxed dev environment Browser, shell and editor access Opens pull requests Slack and Jira integration Runs several tasks in parallel	—	—
What works	Genuinely unattended on well-scoped tasks Fits existing review workflow Parallel tasks scale out routine work	Has a free tier, so it can be tried before paying Publishes its price openly — $15 - $149/mo Sits in Code Assistant, one of the better-covered categories here — easy to compare	Has a free tier, so it can be tried before paying Free to use Sits in Code Assistant, one of the better-covered categories here — easy to compare
What does not	Expensive per task Poor at ambiguous or exploratory work Still needs careful review	97 other tools in this catalogue claim to do the same job	97 other tools in this catalogue claim to do the same job