SpecialistPowerful enterprise AI agent platform for customer service, but tightly coupled to Salesforce rather than standalone like JustCall.

Grammarly records 58,867,412 monthly visits with -1.5% month-over-month growth and Freemium pricing. JustCall records 780,285 monthly visits with +11.8% growth and Paid pricing.

AI communication platform for sales and support teams
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | grammarly.com | justcall.io |
| Pricing Model | Freemium | Paid |
| Monthly Visits | 58.87M (58,867,412) | 780.29K (780,285) |
| MoM Traffic Delta |
| -916.08K (-1.5%) |
| +82.23K (+11.8%) |
| Primary Market & Share | 🇺🇸 United States (51.9%) | 🇺🇸 United States (62.8%) |
|---|
| Direct Visits / mo | 25.4M | 613K |
|---|
| User Rating | 4.4 | 4.4 |
|---|
| Supported Platforms | Website | Website |
|---|

Cross-platform AI writing assistant delivering real-time grammar correction, tone alignment, authorship tracking, and team style guides.
Works natively inside Chrome, Safari, Firefox, Edge, Windows, Mac, Google Docs, MS Office, and mobile keyboards to flag grammar mistakes, rewrite tangled sentences, and shift tone toward confident, empathetic, or executive registers.
Deploys contextual AI agents that predict how a target audience will react to a draft, locate credible supporting citations, grade essays against rubric criteria, and generate drafts using up to 2,000 monthly prompts on Pro.
Scans text against billions of web pages and academic databases for accidental plagiarism, detects AI-generated passages, and logs transparent document provenance via Authorship reports in Google Docs and Word.
Enables teams on Pro and Enterprise plans to codify company terminology, ban deprecated jargon, enforce inclusive language, insert shared Snippets, and surface internal company definitions inline.

AI communication platform for sales and support teams
Automated agents that resolve calls, qualify leads and route callers 24/7, with escalation to a human when needed.
Power, dynamic, predictive and parallel dialing with local presence and smart reattempt rules to boost connect rates.
AI call summaries, transcription, sentiment analysis, agent assist and automatic call scoring for coaching at scale.
SMS, MMS, RCS and WhatsApp conversations with bulk sending, bots and a shared team inbox.
SpecialistPowerful enterprise AI agent platform for customer service, but tightly coupled to Salesforce rather than standalone like JustCall.


SpecialistOutstanding for context-aware translation and professional writing refinement, but not designed as a dedicated grammar checker.
#2Excels at heavy paraphrasing and text rewriting, but offers less seamless inline real-time proofreading across all apps.

Provides strong multilingual grammar and style checking across apps, but offers fewer advanced generative AI features.
Provides robust cloud calling and AI contact center features, though with a different pricing and UI structure than JustCall.

Delivers deeper manuscript analysis and structural reports, but has a steeper learning curve than Grammarly.
SpecialistAI academic writing assistant that edits, cites, and checks your manuscript right where you write
SpecialistHighlights readability and sentence complexity visually, but lacks automated grammar correction and browser-wide extension support.

SpecialistUnifies messaging apps into a shared team inbox with AI, but lacks JustCall's advanced VoIP phone calling features.

Great for sentence-level tone adjustments and rewriting, but less comprehensive for standalone grammar rules and style guides.

SpecialistStrong omnichannel messaging integration for sales and support, but less focused on traditional telephony and cloud calling than JustCall.

Enterprise-grade voice AI for complex customer service workflows, but significantly heavier and more expensive than JustCall.
SpecialistPowerful enterprise AI agent platform for customer service, but tightly coupled to Salesforce rather than standalone like JustCall.
SpecialistOutstanding for context-aware translation and professional writing refinement, but not designed as a dedicated grammar checker.
Excels at heavy paraphrasing and text rewriting, but offers less seamless inline real-time proofreading across all apps.
Provides strong multilingual grammar and style checking across apps, but offers fewer advanced generative AI features.
Provides robust cloud calling and AI contact center features, though with a different pricing and UI structure than JustCall.
Delivers deeper manuscript analysis and structural reports, but has a steeper learning curve than Grammarly.
SpecialistAI academic writing assistant that edits, cites, and checks your manuscript right where you write
SpecialistHighlights readability and sentence complexity visually, but lacks automated grammar correction and browser-wide extension support.
SpecialistUnifies messaging apps into a shared team inbox with AI, but lacks JustCall's advanced VoIP phone calling features.
Great for sentence-level tone adjustments and rewriting, but less comprehensive for standalone grammar rules and style guides.
Enterprise-grade voice AI for complex customer service workflows, but significantly heavier and more expensive than JustCall.