True cost comparison — not just what the pricing page says
Quick Verdict
Grammarly saves you 100%
Best for Grammarly
AI writing assistant for grammar, clarity, and tone. Free plan is basic, then $12-$15/user/mo for fu
Best for Retool
Build internal tools fast with drag-and-drop. Free tier is limited, paid plans are expensive for tea
AI writing assistant for grammar, clarity, and tone. Free plan is basic, then $1...
Advertised
$0
/month
True Cost
$12
/month (typical)
AI Writing Assistance Limits
Generative AI features (rewrite, compose, ideate) have monthly prompt limits. Premium gets 1,000 pro...
Premium Required for Full Features
Free plan only catches basic grammar and spelling. Clarity, tone detection, word choice, formality l...
Per-Seat Team Pricing
Grammarly Business at $15/user/mo. A 50-person team = $750/mo ($9,000/yr). Team analytics, style gui...
Build internal tools fast with drag-and-drop. Free tier is limited, paid plans a...
Advertised
$10
/month
True Cost
$600
/month (typical)
Dual User Pricing (Builder vs User)
Retool charges differently: builders (devs who create apps) cost $10-50/mo, internal users (employee...
Workflow Run Overage
$75 per 5,000 additional workflow runs/month ($0.015/run). A single workflow running every 5 minutes...
External User Tiered Pricing
Customer-facing portals on Business: first 50 free, then $8/user/mo (51-250), $6 (251-500), $4 (500+...
SSO/SAML Requires Enterprise
SAML/OpenID SSO is Enterprise-only with custom (undisclosed) pricing. Any company with SSO requireme...
Audit Logs Require Business
Audit logging needs Business at $50/builder/mo — 5x the Team price. Required for SOC 2, HIPAA compli...
Grammarly advertises $0/mo. Retool advertises $10/mo.
Grammarly has 3 documented hidden fees. Retool has 5.
Grammarly confidence: 76%. Retool confidence: 70%.
| Metric | Grammarly | Retool | Winner |
|---|---|---|---|
| Advertised Price | $0/mo | $10/mo | Grammarly |
| True Monthly Cost | $12/mo | $600/mo | Grammarly |
| Hidden Fee Total | +$12/mo | +$590/mo | Grammarly |
| # Hidden Fees | 3 | 5 | Grammarly |
| Confidence Score | 76% | 70% | Grammarly |
| Pricing Tiers | 3 | 4 | — |
| Affiliate Program | None | None | — |
Grammarly advertises $0/mo and Retool advertises $10/mo. However, when you include hidden fees, Grammarly has 3 documented hidden fees adding +$12/mo, while Retool has 5 hidden fees adding +$590/mo. Based on true cost, Grammarly is typically 100% cheaper.
Grammarly has 3 documented hidden fees: AI Writing Assistance Limits, Premium Required for Full Features, Per-Seat Team Pricing. These add approximately +$12/mo on top of the $0/mo advertised price.
Retool has 5 documented hidden fees: Dual User Pricing (Builder vs User), Workflow Run Overage, External User Tiered Pricing, SSO/SAML Requires Enterprise, Audit Logs Require Business. These add approximately +$590/mo on top of the $10/mo advertised price.
Choose Grammarly if: AI writing assistant for grammar, clarity, and tone. Free plan is basic, then $12-$15/user/mo for fu. Choose Retool if: Build internal tools fast with drag-and-drop. Free tier is limited, paid plans are expensive for tea. The right choice depends on your team size, usage volume, and which features you need most.
This comparison is based on manual research of official pricing pages, terms of service, and user reports. Grammarly data has a 76% confidence score and Retool has 70%. Prices were last verified in April 2026. For the most accurate estimate, enter your specific usage in our calculator.
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