Comparison
Mailreplai vs HeyHelp
One is ready out of the box. The other asks you to bring your own API key.
HeyHelp takes a unique approach to AI email assistance: it is a Gmail extension where you bring your own AI API key from OpenAI, Google Gemini, or Anthropic. While power users might appreciate that flexibility, it adds friction, hidden costs, and technical complexity that most professionals do not want to deal with. Mailreplai works out of the box — install the Outlook add-in and start getting AI replies in minutes. No API keys, no token management, no surprise bills from OpenAI.
Feature-by-feature comparison
Why professionals choose Mailreplai
Zero setup, zero friction
Install Mailreplai from the Microsoft Marketplace and you are up and running in under 3 minutes. HeyHelp requires you to obtain, configure, and manage an API key from a third-party AI provider — a process that intimidates most non-technical users.
Predictable costs
Mailreplai is a flat $19.99/month for unlimited emails. With HeyHelp, you pay the subscription fee plus whatever your AI API usage costs — a number that varies monthly and can spike unexpectedly during busy email periods.
Voice-to-email
Speak your reply naturally and Mailreplai drafts a polished email. HeyHelp has no voice input capability — you are still typing or copy-pasting every time.
Built for Outlook
HeyHelp only works with Gmail. Mailreplai is a native Outlook add-in that integrates seamlessly into your existing Microsoft workflow, including To Do sync.
Production-ready features
Mailreplai ships with follow-up tracking, inbox cleanup suggestions, and auto-categorization today. Several HeyHelp features like custom labels, AI follow-ups, and AI scheduling are still listed as "in development."
Professional support
Mailreplai offers dedicated support and even a talk-to-founder option. HeyHelp is a launch-stage product with limited documentation and support resources.
Common concerns with HeyHelp
Requires users to supply and manage their own AI API key from OpenAI, Google, or Anthropic — adding technical complexity and unpredictable costs on top of the subscription fee.
Gmail only — no Outlook support at all, leaving Microsoft ecosystem users without an option.
Several advertised features (custom labels, AI follow-ups, AI scheduling) are still in development and not yet available.
Launch-stage product with limited documentation, meaning less mature tooling and potential reliability concerns.
BYO-API-key model means your email content is sent directly to whichever AI provider you choose, with security depending on your own API configuration.
Limited feature differentiation between pricing tiers makes it hard to understand what you get for your money.
The verdict
HeyHelp offers an interesting BYO-API-key approach that appeals to tinkerers, but most professionals want an email assistant that just works. Mailreplai delivers a polished, ready-to-use experience with voice replies, follow-up tracking, and deep Outlook integration — no API keys, no hidden costs, no features still in development. If you want reliability over experimentation, Mailreplai is the clear choice.
See how Mailreplai compares to other tools
Ready to upgrade your email workflow?
Try Mailreplai free and see the difference for yourself. Set up takes less than 3 minutes.