Email on Acid vs QA Sphere

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

Email on Acid

See full pricing history

USD · US · source: www.emailonacid.com

Plan	Pricing	Charged by	Offer type
Basic Mailgun Inspect Highlighted	USD 99 monthly $99/month	Flat · published subscription	Standalone · Fixed
Premium Mailgun Inspect	USD 199 monthly $199/month	Flat · published subscription	Standalone · Fixed
Contract Mailgun Inspect	Contact sales Custom pricing	Flat · published subscription	Standalone · Contact sales

QA Sphere

See full pricing history

USD · US · source: qasphere.com

Plan	Pricing	Charged by	Offer type
Totally Free	Free Free	Flat · published subscription	Standalone · Free
Standard Highlighted	USD 12 monthly $12/user/month	Seat · per user per month	Standalone · Fixed
Business	USD 24 monthly $24/user/month	Seat · per user per month	Standalone · Fixed
Enterprise	Contact sales Contact us	Flat · published subscription	Standalone · Contact sales

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

Email on Acid

Basic Mailgun Inspect

Official plan card Users: Unlimited

Limited
Official plan card Email previews: 1,000/month

Limited
Official plan card Preview clients and devices: 100+

Limited

Premium Mailgun Inspect

Official plan card Users: Unlimited

Limited
Official plan card Email previews: 2,000/month

Limited
Official plan card HTML, link, image, and spam checks: Included

Contract Mailgun Inspect

Official plan card Users: Unlimited

Limited
Official plan card Preview allowance: Custom

Limited
Official plan card Phone and chat support: Included

QA Sphere

Totally Free

Official plan card Users: Up to 3

Limited
Official plan card Attachment storage: 1 GB

Limited
Official plan card API and integrations: Included

Standard

Official plan card Viewers and projects: Unlimited

Limited
Official plan card Attachment storage: 200 GB

Limited
Official plan card Google SSO: Included

Business

Official plan card Extended AI credits: Included
Official plan card SAML 2.0 SSO: Included
Official plan card Attachment storage: 1 TB+

Limited

Enterprise

Official plan card Tailored compliance: Included
Official plan card Custom organizational needs: Included
Official plan card Priority support: Included

How their prices changed

Each dated row shows the public prices observed when that vendor’s pricing page changed.

Email on Acid

August 27, 2026 Source
- Basic Mailgun Inspect: USD 99 monthly
- Premium Mailgun Inspect: USD 199 monthly
- Contract Mailgun Inspect: Contact sales

QA Sphere

August 27, 2026 Source
- Totally Free: Free
- Standard: USD 12 monthly
- Business: USD 24 monthly
- Enterprise: Contact sales