What Is GMass?
GMass is a Chrome extension for Gmail that enables mass email sending directly from your Gmail account. It's designed for sending large volumes of personalized emails to lists, with open and click tracking, automated follow-up sequences, and merge tag personalization.
The target user is someone who wants to send hundreds or thousands of emails through Gmail without a dedicated ESP. Email tracking is a feature, but mass sending is the core value proposition.
GMass vs Outsolvi at a Glance
| Feature | GMass | Outsolvi |
| Gmail support | Yes (Chrome only) | Yes |
| Native Outlook add-in | No | Yes |
| Mass email sending | Yes | No |
| AI follow-up insights | No | Yes |
| Reply sentiment analysis | No | Yes |
| Smart Compose | No | Yes |
| Works outside Chrome | No | Yes (Outlook desktop/mobile) |
| Team coordination features | Limited | Yes |
| Unified Outlook + Gmail dashboard | No | Yes |
| Starting price | $29.95/mo Standard | $7/mo |
| Email content stored | Yes (for campaigns) | No (metadata only) |
Pricing Comparison
GMass Standard at $29.95/month covers one Gmail account with open/click tracking and follow-up sequences. Higher tiers unlock multi-account and team features.
Outsolvi at $7/month for individuals covers both Outlook and Gmail tracking with AI features included. Teams Pro at $20/user/month adds shared dashboards and team coordination.
Feature Comparison
Fundamentally Different Use Cases
GMass and Outsolvi don't really compete — they address different problems. GMass is for sending at volume through Gmail. Outsolvi is for intelligent tracking and follow-up intelligence across Outlook and Gmail.
If you're sending 500 cold emails per day through Gmail, GMass h-built infrastructure for that. If you're having 1-to-1 and small-group sales conversations and need to know when to follow up and how engaged each prospect is, Outsolvi is the right tool.
Platform Coverage
GMass is Chrome-only. It runs Chrome extension inside Gmail in a browser. There is no Outlook add-in, no Microsoft 365 support, no native desktop integration. Reps working in Outlook desktop — which represents the majority of enterprise email users — get nothing from GMass.
Outsolvi's native Outlook add-in works in Outlook desktop, Outlook Web, and Outlook mobile. Combined with the Gmail Chrome extension, the full team is covered regardless of platform.
Tracking Intelligence
GMass provides open rate statistics and click tracking at the campaign level — aggregate data about how a mass email performed. This is useful for optimizing cold campaign templates and subject lines.
Outsolvi tracks at the individual contact level: when a specific person opens your email, how many times, from what device, and what their reply sentiment suggests. The AI layer then interprets these signals into actionable follow-up recommendations for that specific contact.
AI Features
GMass h AI follow-up intelligence, reply sentiment analysis, or Smart Compose. Its analytics are aggregate-focused, not individual-intelligence-focused.
Outsolvi's AI is designed for the question "what should I do next with this specific prospect?" — a different question than "how did my campaign perform?"
Where GMass Wins
- Mass sending infrastructure: Genuinely built for sending hundreds to thousands of emails per day through Gmail.
- List management: CSV imports, Google Sheets integration, and list segmentation for campaign management.
- Automated follow-up sequences: Multi-step follow-ups on non-responders at scale.
- Gmail integration depth: Works within Gmail's native compose window with minimal friction.
Where Outsolvi Wins
- Outlook support: GMass doesn't exist in Outlook. Outsolvi does.
- Price: $7/mo vs $29.95/mo.
- AI intelligence: Follow-up recommendations, reply sentiment analysis, Smart Compose — not available in GMass.
- Individual-level insights: Track engagement at the contact level, not just campaign aggregate level.
- Privacy: No email content storage; metadata-only tracking.
- Team features: Shared dashboards, account-level visibility across the team.
Who Should Choose GMass?
GMass is appropriate for individuals or small teams running high-volume outbound campaigns entirely within Gmail, who need mass sending features and campaign-level analytics, and who don't need Outlook support.
Who Should Choose Outsolvi?
Outsolvi is the better choice for sales teams that send to individual prospects and accounts (rather than mass campaigns), need Outlook support, want AI-guided follow-up intelligence at the contact level, and care about keeping email content off third-party servers.
The Verdict
GMass is a mass email tool and Outsolvi is an engagement intelligence platform. If you're running campaigns at scale in Gmail, GMass h you need. If you're selling to specific people and want to know exactly when and how to follow up — in Outlook, Gmail, or both — Outsolvi is purpose-built for that.
Try Outsolvi free for 14 days — works in Outlook and Gmail, no credit card needed.